Relevant bibliographies by topics / Notch stress intensity factors

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Notch stress intensity factors'

Author: Grafiati
Published: 9 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Notch stress intensity factors.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Notch stress intensity factors"

1

Chen, Bo, and You Tang Li. "Dimensionless Stress Intensity Factors of an Annular Notched Shaft." Key Engineering Materials 488-489 (September 2011): 174–77. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.174.

Full text
Abstract:
The tip radius ρ, depth t and field angle α of notch and the geometrical sizes a and b of shaft are looked as descriptive parameters in the annular notched shaft. Taken the crack, blunt crack and notch as breach, the stress field and displacement field near the tip of breach which serve dimensionless factor fα(a/b) as descriptive parameter are obtained. The effects of parameters ρ, t and α to fα(a/b) are analyzed. The connections between stress intensity factor of crack and stress concentrator factor of notch, between sharp V-notch and crack, between V-notch and U-notch have been founded.
APA, Harvard, Vancouver, ISO, and other styles
2

PING, XUE-CHENG, MENG-CHENG CHEN, NAO-AKI NODA, and YI-HUA XIAO. "ANALYSIS OF GENERALIZED STRESS INTENSITY FACTORS OF V-SHAPED NOTCH PROBLEMS BY FEM." International Journal of Computational Methods 10, no. 06 (May 2, 2013): 1350068. http://dx.doi.org/10.1142/s0219876213500680.

Full text
Abstract:
This paper deals with a-finite element method (FEM) based on a V-shaped notch corner tip stresses to solve generalized stress intensity factors (GSIFs) in 2D elastic bodies. The method does not need extremely refined meshes and special elements accounting for the analytical form of singularities around the V-shaped notch corner tip. The generalized stress intensity factors of the V-shaped notch problems are evaluated from the ratios of FEM stress values at the notch corner tip for a given problem and a reference one. Several numerical examples show that present method is effective and applicable to dealing with the V-shaped notch problems.
APA, Harvard, Vancouver, ISO, and other styles
3

Nowell, D., D. Dini, and P. Duó. "Stress analysis of V-notches with and without cracks, with application to foreign object damage." Journal of Strain Analysis for Engineering Design 38, no. 5 (July 1, 2003): 429–41. http://dx.doi.org/10.1243/03093240360713487.

Full text
Abstract:
Gas turbine engines can be subject to ingestion of small hard particles, leading to foreign object damage. This can take the form of sharp V-notches in the leading edge of blades and there is a need to predict the initiation and propagation behaviour of fatigue cracks growing from the base of the notch. The notch geometry is quite extreme and is not normally covered in standard references for notch stress concentration factors. Similarly, stress intensity factor solutions for this geometry are not widely available. This paper uses the dislocation density approach to solve the two-dimensional elastic problem of a V-notch with a radiused root. Stress concentration factors are found for the notch itself, and stress intensity factors are determined for cracks growing away from the notch for cases of applied and residual stress distributions. Comparisons are made with existing notch solutions from the literature.
APA, Harvard, Vancouver, ISO, and other styles
4

Horníková, Jana, Pavel Šandera, Stanislav Žák, and Jaroslav Pokluda. "Stress Intensity Factors for Cracks Emanating from a Notch under Shear-Mode Loading." Key Engineering Materials 774 (August 2018): 48–53. http://dx.doi.org/10.4028/www.scientific.net/kem.774.48.

Full text
Abstract:
The influence of the notch geometry on the stress intensity factor at the front of the emanating cracks is well known for the opening loading mode. The critical length of the crack corresponding to a vanishing of the influence of the notch stress concentration can be approximately expressed by the formula aI,c = 0.5ρ(d/ρ)1/3, where d and ρ are the depth and radius of the notch, respectively. The aim of the paper was to find out if this formula could be, at least nearly, applicable also to the case of shear mode loading. The related numerical calculations for mode II and III loading were performed using the ANSYS code for various combinations of notch depths and crack lengths in a cylindrical specimen with a circumferential U-notch. The results revealed that, for mode II loading, the critical length was much higher than that predicted by the formula for mode I loading. On the other hand, the critical lengths for mode I and mode III were found to be nearly equal.
APA, Harvard, Vancouver, ISO, and other styles
5

Karim Hussain, Mirzaul, and K. S. R. K. Murthy. "Numerical Estimation of Notch Stress Intensity Factors of Sharp V-Notches." MATEC Web of Conferences 172 (2018): 03001. http://dx.doi.org/10.1051/matecconf/201817203001.

Full text
Abstract:
In the present work a simple and efficient least squares method is implemented for accurate estimation of notch stress intensity factors (NSIFs) of sharp V-notches. Finite element (FE) stress components near a notch tip is used in the present method for determining the NSIFs. Pure mode I and mixed mode (I/II) examples are considered for numerical investigations. The mixed mode stress components are disintegrated into opening mode and shear mode stress components to separate out the mode I and mode II singularities. Thereafter, least squares method is implemented to calculate mixed mode NSIFs. The present method is easy to incorporate in existing standard finite element codes. The results obtained by the present method are found to be in good agreement with the published data.
APA, Harvard, Vancouver, ISO, and other styles
6

Fodil, Lahouari, Abdallah El Azzizi, and Mohammed Hadj Meliani. "Estimation of Mixed-Mode Stress Intensity Factors with Presence of the Confinement Parameters T-Stress and A3." Advanced Engineering Forum 18 (September 2016): 52–57. http://dx.doi.org/10.4028/www.scientific.net/aef.18.52.

Full text
Abstract:
A failure criterion is proposed for ductile fracture in U-notched components under mixed mode static loading. The Compact Tension Shear (CTS) is the preferred test specimen used to determine stress intensity factor in the mode I, mode II and the mixed-mode fracture. In this work, the mode I and mode II stress intensity factors were computed for different notch ratio lengths 0.1<a/W<0.7, of the inner radius of notch 0.25mm<ρ<4mm and load orientation angles 0°<α< 90° using finite element analysis. However, a review of numerical analysis results reveals that the conventional fracture criteria with only stress intensity factors (NSIFs) Kρ first term of Williams’s solution provide different description of stress field around notch zone comparing with results introduce the second and third parameter T-stress and A3.
APA, Harvard, Vancouver, ISO, and other styles
7

Li, You Tang, Zhi Yuan Rui, and Chang Feng Yan. "A New Method to Calculate Dynamic Stress Intensity Factor for V-Notch in a Bi-Material Plate." Key Engineering Materials 385-387 (July 2008): 217–20. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.217.

Full text
Abstract:
The stress singularity eigen-equation for V-notch in a bi-material plate is obtained. A new definition of dynamic stress intensity factor of a crack perpendicular to bi-material interface is put forward, and then is extended to any V-notch in bi-material plate. A formula of stress extrapolation method to calculate dynamic stress intensity factors of V-notch in bi-material plate is obtained. As an example, the three points bending sample with two materials is investigated.
APA, Harvard, Vancouver, ISO, and other styles
8

Turis, Matúš, Oľga Ivánková, Peter Burik, and Milan Držík. "Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique." Applied Sciences 11, no. 10 (May 17, 2021): 4574. http://dx.doi.org/10.3390/app11104574.

Full text
Abstract:
An experimental optical method has been developed for the measurement of opening and sliding notch face movements. The light passing through a thin slit is monitored by a photodiode detector. Two parts of the slit are fixed independently on the notch faces of the simulated crack. Dynamic variations of the notch face movements are recorded as an electric signal by an oscilloscope. The sensitivity of such displacement measurement is comparable with the wavelength of light. Dynamic mixed-mode stress intensity factors under shock loading were evaluated from the data obtained and subsequently compared with a numerical simulation by ANSYS software. As it was approved, the technique has shown sufficient sensitivity, good linearity, and measurement reliability. Due to its non-destructive nature and overall robustness, the arrangement is applicable even for structural component condition determination taking into consideration potentially unknown boundary conditions and the non-linear character of mechanical parameters.
APA, Harvard, Vancouver, ISO, and other styles
9

RADAJ, D. "T-stress corrected notch stress intensity factors with application to welded lap joints." Fatigue & Fracture of Engineering Materials & Structures 33, no. 6 (March 11, 2010): 378–89. http://dx.doi.org/10.1111/j.1460-2695.2010.01454.x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pang, H. L. J. "Stress analysis of short weld toe cracks." Journal of Strain Analysis for Engineering Design 28, no. 1 (January 1, 1993): 1–4. http://dx.doi.org/10.1243/03093247v281001.

Full text
Abstract:
Finite element analysis of weld toe cracks was used to determine the J integral and hence stress intensity factors based on elastic and elastic-plastic conditions. For a given fillet notch geometry, the results showed that the elastic solution overestimated stress intensity factors for short weld toe cracks, below 0.5 mm deep, under applied stresses which were around half the magnitude of the yield stress.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Notch stress intensity factors"

1

Ščotka, Martin. "Vliv koncentrace napětí ve vrubu na napjatost a deformaci na čele trhlin zatížených ve smykových zátěžných módech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318836.

Full text
Abstract:
This diploma thesis deals with influence of a notch on stress-strain states at the front of cracks by shear modes. Starting with fracture mechanics and its division, followed by stress intensity factor and calculate its by finite element method. Calculation is solved for two types of notches, U-notched and V-notched, both notches were modeled parametrically so their geometry was changeable and stress intensity factor were calculated for all configurations. Subsequently was solved next calculation of stress intensity factor but for shaft without notch. Finally, was evaluated influence of notch on stress intensity factor. Software for finite element method has been used ANSYS. Others calculation was provided in software MATLAB
APA, Harvard, Vancouver, ISO, and other styles
2

Afshar, Hosseinabadi Reza. "Stress analysis of periodic notches by using the strain energy density approach." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423526.

Full text
Abstract:
This research focuses on the stress analysis of periodic notches by using the strain energy density approach. Bolts, screws and rotary-shouldered connections, as examples of periodic notched components, play an important role in the performance of the machinery. The contents are related to two-dimensional (2D), as well as three-dimensional (3D) modeling of periodic notches both in the case of round and sharp notches. The analyses are based on the numerical modeling of periodic notches with linear elastic assumption of the material. The simple analytical expressions for the notch stress intensity factors (NSIFs) of periodic sharp notches, as well as theoretical stress concentration factors (SCFs) of periodic blunt notches are obtained. Using the strain energy density (SED) approach, the coarse mesh in the finite element models is used and compared with the results obtained from the fine meshing. In fact, using SED approach, the averaged strain energy in a control volume allows using the coarse meshes in order to determine the NSIFs and SCFs of notched components precisely. In the case of 3D analysis, the thickness effects with particular attention on coupling modes, which due to Poisson effect are automatically generated, are studied. These modes can have a significant effect on the structural integrity of mechanical components. In addition, two collaborative industry projects with: Officine Meccaniche Zanetti s.r.l. and Omera s.r.l. are successfully implemented.
Questa ricerca si concentra su "Analisi delle sollecitazioni di intagliati periodici utilizzando l'approccio di densità di energia di deformazione", si è occupato di problematiche relative alla modellazione bidimensionale e tridimensionale di intagli periodici raccordati e a spigolo vivo. Bulloni, viti e connessioni rotanti spalle, come esempi di componenti intagliati periodiche, svolgono un ruolo importante nelle performance delle macchine. L'attività ha coinvolto prevalentemente la modellazione numerica in campo elastico ed ha permesso di ottenere delle semplici espressioni per la stima dei fattori d’intensificazione delle tensioni (NSIFs) e dei fattori teorici di concentrazione delle tensioni (SCFs) in funzione di tutti i parametri geometrici considerati. Le analisi numeriche sono state effettuate in prima battuta con mesh fitte e successivamente con mesh molto rade. Nel secondo caso l’energia di deformazione mediata in un volume di controllo ha permesso di determinare con precisione i fattori tensionali di riferimento e alcune espressioni per l’applicazione diretta a problematiche simili. Nel caso tridimensionale sono stati studiati e analizzati gli effetti legati allo spessore con particolare riferimento ai modi accoppiati che vengono automaticamente generati per effetto Poisson e che possono incidere in modo rilevante sull’integrità strutturale di componenti meccanici. I risultati raggiunti sono stati applicati a casi aziendali con due collaborazioni tutt’ora in atto con Officine Meccaniche Zanetti e Omera formalizzate in progetti di ricerca in cui il dottorando è stato il principale protagonista.
APA, Harvard, Vancouver, ISO, and other styles
3

Hrstka, Miroslav. "Evaluation of Fracture Mechanical Parameters for Bi-Piezo-Material Notch." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399212.

Full text
Abstract:
Předkládaná dizertační práce se zabývá stanovením hlavních členů Williamsova asymptotického rozvoje popisujícího rovinné elektro-elastické pole v okolí piezoelektrických bi-materiálových vrubů a trhlin na rozhraní za použití rozšířeného Lechnického-Eshelbyho-Strohova formalismu v návaznosti na čistě anizotropní pružnost. Je ukázáno, že rozšířený Lechnického-Eshelbyho-Strohův formalismus představuje spolu s moderními programovacími koncepty v jazyku Python efektivní a také praktický nástroj pro lomovou analýzu piezoelektrických bi-materiálů. Teoretická část práce popisuje aspekty anizotropní pružnosti a její návaznost na piezoelektrické materiály. Základní rovnice zaměřené na speciální typy monoklinických materiálů, které umožňují oddělení rovinného a anti-rovinného problému, jsou vyjádřeny pomocí komplexních potenciálů. V praktické části práce je sestaven problém vlastního hodnot pro bi-materiálový vrub, na jehož základě jsou stanoveny exponenty singularity a pomocí dvoustavového -integrálu také zobecněné faktory intenzity napětí. Veškeré vztahy a numerické procedury jsou následně rozšířeny na problém piezoelektrických bi-materiálových vrubů a podrobně prozkoumány v uvedených příkladech. Zvláštní pozornost je věnována přechodu asymptotického řešení téměř zavřených vrubů a trhlin na rozhraní. Vliv směru polarizace na asymptotické řešení je také zkoumán. Přesnost stanovení zobecněných faktorů intenzity napětí je testována srovnáním asymptotického řešení a řešení získaného pomocí metody konečných prvků s velmi jemnou sítí konečných prvků. Na závěr je formalismus modifikován pro nepiezoelektrické materiály.
APA, Harvard, Vancouver, ISO, and other styles
4

Treifi, Muhammad. "Fractal-like finite element method and strain energy approach for computational modelling and analysis of geometrically V-notched plates." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/fractallike-finite-element-method-and-strain-energy-approach-for-computational-modelling-and-analysisof-geometrically-vnotched-plates(93e63366-8eef-4a29-88a4-0c89cf13ec1f).html.

Full text
Abstract:
The fractal-like finite element method (FFEM) is developed to compute stress intensity factors (SIFs) for isotropic homogeneous and bi-material V-notched plates. The method is semi-analytical, because analytical expressions of the displacement fields are used as global interpolation functions (GIFs) to carry out a transformation of the nodal displacements within a singular region to a small set of generalised coordinates. The concept of the GIFs in reducing the number of unknowns is similar to the concept of the local interpolation functions of a finite element. Therefore, the singularity at a notch-tip is modelled accurately in the FFEM using a few unknowns, leading to reduction of the computational cost.The analytical expressions of displacements and stresses around a notch tip are derived for different cases of notch problems: in-plane (modes I and II) conditions and out-of-plane (mode III) conditions for isotropic and bi-material notches. These expressions, which are eigenfunction series expansions, are then incorporated into the FFEM to carry out the transformation of the displacements of the singular nodes and to compute the notch SIFs directly without the need for post-processing. Different numerical examples of notch problems are presented and results are compared to available published results and solutions obtained by using other numerical methods.A strain energy approach (SEA) is also developed to extract the notch SIFs from finite element (FE) solutions. The approach is based on the strain energy of a control volume around the notch-tip. The strain energy may be computed using commercial FE packages, which are only capable of computing SIFs for crack problems and not for notch problems. Therefore, this approach is a strong tool for enabling analysts to compute notch SIFs using current commercial FE packages. This approach is developed for comparison of the FFEM results for notch problems where available published results are scarce especially for the bi-material notch cases.A very good agreement between the SEA results and the FFEM results is illustrated. In addition, the accuracy of the results of both procedures is shown to be very good compared to the available results in the literature. Therefore, the FFEM as a stand-alone procedure and the SEA as a post-processing technique, developed in this research, are proved to be very accurate and reliable numerical tools for computing the SIFs of a general notch in isotropic homogeneous and bi-material plates.
APA, Harvard, Vancouver, ISO, and other styles
5

Krepl, Ondřej. "Napjatost v okolí velmi ostrých bimateriálových vrubů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230865.

Full text
Abstract:
Presented diploma thesis is concerned with problems of a stress singularity exponent and a generalized stress intensity factor determination, by dint the stress field in the vicinity of the stress concentrator can be consecutively determined. This task is possible to sectionalize into three parts. The first part summarizes basic information about linear anisotropic materials, deals with fundamentals of the linear elastic fracture mechanics and introduces its generalization to the case of the generalized stress intensity factors. The second part is dedicated to a special theory of anisotropic elasticity - Lekhnitskii-Eshelby-Stroh formalism (LES). Furthermore, a theory of the psi-integral is introduced, by dint the stress intensity factor is determined. The final part applies the LES theory and the psi-integral to the concrete material configuration of a crack on the bimaterial interface, a special example of a sharp bimaterial notch. By means of analytical-numerical algorithm in ANSYS and Silverforst FNT95 software the stress singularity exponents and generalised stress intensity factors are consecutively computed.
APA, Harvard, Vancouver, ISO, and other styles
6

Štegnerová, Kateřina. "Aplikace zobecněné lineárně elastické lomové mechaniky na odhad počátku šíření trhliny z ostrého V-vrubu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230773.

Full text
Abstract:
The master thesis is focused on estimation of crack propagation origin from sharp V-notch. Stress distribution around the tip of the V-notch is described on the base of generalized linear elastic fracture mechanics. The change of the stress singularity exponent caused by geometry of the V-notch and the vertex singularity is taken into account. The first part of the work is devoted to the estimation of the stress singularity exponent of the V-notch either from stress distribution around the tip of the V-notch or by using analytical solution. Formerly derived stability criteria are applied in the second part of the work. The origin of the crack propagation is estimated for several experimental specimens. The aim of this thesis is to compare the available experimentally observed data with results obtained using those criteria based on the application of generalized linear elastic fracture mechanics developer at the Institute of Physics of Materials Academy of Sciences of the Czech Republic. The finite element code Ansys and mathematical software Matlab were used for the necessary calculations.
APA, Harvard, Vancouver, ISO, and other styles
7

Hrstka, Miroslav. "Popis rozložení napětí v okolí bimateriálového vrubu pomocí zobecněného faktoru intenzity napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230355.

Full text
Abstract:
The presented diploma thesis deals with a problem of a generalized stress intensity factor determination and a consecutive study of stress distribution around the bimaterial notch tip, combining analytical and numerical methods. This task is possible to sectionalize into three parts. The first part is dedicated to the fundamentals of the linear fracture mechanics and the mechanics of composite materials. The second part deals with methods of anisotropic plane elasticity solution. Pursuant to the solution the computational models in the third part are created. The first model makes for determination of a singularity exponent eigenvalue by dint of Lekhnitskii-Eshelby-Stroh formalism. The second model makes for determination of the generalized stress intensity factor using psi-integral method, which is based on the Betti reciprocal theorem. All needed calculation are performed in the software ANSYS 12, Maple 12 and Silverforst FTN95. Results will be compared with the values obtained from a direct method of the generalised stress intensity factor determination.
APA, Harvard, Vancouver, ISO, and other styles
8

CARVALHO, EDUARDO ATEM DE. "STRESS INTENSITY FACTORS AND STRESS CONCENTRATION FACTORS FOR V NOTCHES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24990@1.

Full text
Abstract:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A partir das equações de Williams e Creager foi desenvolvido um método híbrido, que acopla fotoelasticidade a um método numérico-computacional para determinação a dos fatores de intensificação de tensões (FIT) em placas planas sujeitas aos Modos I e II de abertura, com ou sem arredondamento na raiz do entalhe. Às equações propostas acopla-se um polinômio completo que representa uma tensão não-singular (sigma). Assim feito é possível a determinação dos coeficientes KI, KI e termos de sigma. Três programas de computador foram desenvolvidos para as formulações (Williams ou Creager): O primeiro: a partir da configuração das franjas isocromáticas, obtém-se KI e KII e os termos relativos à tensão não singular. O segundo: o desvio relativo a cada ordem de franja é determinado a partir dos termos acima. O terceiro: a partir dos valores determinados regenera-se as franjas isocromáticas para compara-las com as originais. As formulações foram testadas em modelos de barras com trincas e entalhes (com e sem arredondamento na raiz) e seus resultados comparados com dados disponíveis na literatura. Os fatores de influência na determinação de KI e KII, estudados foram: a quantidade de pontos e o ângulo delimitador da região de coleta de dados, bem como a influência dos termos referentes ao campo não singular e alguns aspectos do método numérico implementado. Como aplicação estudou-se o caso do corpo de prova tipo Charpy, onde, a partir das equações de Creager e dos valores de KI e KII assim determinados, pôde-se obter o valor de Kt para uma dada geometria.
A hybrid method coupling photoelasticity to a numerical-computational method which implements the William s (modes I and II) and Creager s (mode I) equations has been developed to determine the mixed-mode stress intensity factors in sharp notches and blunt cracks. The equations take into account the presence or not of a radius in the tip of the notch. To the proposed equations was added a complete polynomial, which represents the non-singular stress field. Three computational programs were developed for both formulations (William s and Creager): one to determine KI, KII and the non-singular terms, the second to evaluate the error between the actual situation and the results obtained and the third to regenerate the isochromatic fringes. The method has been tested in bars with cracks and notches (taking or not into account the existence of the radius at the depth of the notch) and the results were compared to experimental and analytical data found in the literature. Factors which have influence on the determination of KI, KII, were discussed: the number of data points and sector angle where those points are collected as well as the influence of the number of non-singular terms and some aspects of the numeric method. Two applications were studied: Charpy type test specimen under tension and bending and a beam with deep simetrycal grooves. With the values of KI and KII obtained by the Creager s equations one can determine the valeu of sigma x and sigma y in the analyzed situation, as well as the Kt value.
APA, Harvard, Vancouver, ISO, and other styles
9

Roy, Michael Robert. "Stress intensity factors for ship details." Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2287.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Choi, John O. "Dynamic stress intensity factors in orthotropic materials." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12409.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Notch stress intensity factors"

1

Pukas, S. R. On plane strain mode 1 stress intensity factors for a single edge notch beam specimen of span/width ratio 4 under three point loading. Glasgow: National Engineering Laboratory, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Pukas, S. R. On plane strain mode 1 stress intensity factors for a single edge notch beam specimen of span/width ratio 4 under three point loading. East Kilbridge: National Engineering Laboratory, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

1943-, Murakami Y., Hasebe N, and Nihon Zairyō Gakkai, eds. Stress intensity factors handbook. 3rd ed. Amsterdam: Elsevier, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

1943-, Murakami Y., ed. Stress intensity factors handbook. Oxford [Oxfordshire]: Pergamon, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

1943-, Murakami Y., and Nihon Zairyō Gakkai, eds. Stress intensity factors handbook, volume 3. Kyoto, Japan: Society of Materials Science, Japan ; Oxford ; New York : Pergamon, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Fett, Theo. Stress intensity factors and weight functions. Southampton, UK: Computational Mechanics Publications, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Fett, Theo. Stress intensity factors, T-stresses, weight functions. Karlsruhe: IKM, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Binienda, Wieslaw K. Calculation of stress intensity factors in an isotropic multicracked plate. [Washington, DC: National Aeronautics and Space Administration, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

J, Zhang, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering Technology., and Argonne National Laboratory, eds. Residual stresses and associated stress intensity factors in core shroud weldments. Washington, DC: Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

N, Atluri Satya, Newman J. C, and Langley Research Center, eds. Stress-intensity factors for small surface and corner cracks in plates. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Notch stress intensity factors"

1

Wang, Feng Hui. "Stress Intensity Factor of Notch/Crack Configuration under Bending Load for Brittle Materials." In Fracture and Damage Mechanics V, 1051–54. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.1051.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Minor, E. L., M. Louah, Z. Azari, G. Pluvinage, and A. Kifani. "Brittle Mixed Mode Fracture I+II: Emanating from Notches -Equivalent Notch Stress Intensity Factor -H." In Transferability of Fracture Mechanical Characteristics, 337–50. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0608-8_24.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Zehnder, Alan T. "Stress Intensity Factors." In Encyclopedia of Tribology, 3335–40. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_257.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hills, D. A., and D. Nowell. "Kinked Cracks: Finding Stress Intensity Factors." In Applied Stress Analysis, 36–50. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Yosibash, Zohar. "Computing Generalized Stress Intensity Factors (GSIFs)." In Interdisciplinary Applied Mathematics, 133–56. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-1508-4_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gdoutos, E. E. "Stress Intensity Factors for a Linear Stress Distribution." In Problems of Fracture Mechanics and Fatigue, 53–56. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Konsta-Gdoutos, M. S. "Calculation of Stress Intensity Factors by Superposition." In Problems of Fracture Mechanics and Fatigue, 45–48. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Gdoutos, E. E. "Calculation of Stress Intensity Factors by Integration." In Problems of Fracture Mechanics and Fatigue, 49–51. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Banks-Sills, Leslie. "Methods of Calculating Stress Intensity Factors–Delaminations." In Interface Fracture and Delaminations in Composite Materials, 67–75. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60327-8_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Gdoutos, E. E. "Mixed-Mode Stress Intensity Factors in Cylindrical Shells." In Problems of Fracture Mechanics and Fatigue, 57–61. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_13.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Notch stress intensity factors"

1

Hasegawa, Kunio, Pierre Dulieu, and Valery Lacroix. "Stress Intensity Factor Interaction of Subsurface Flaws Under Notches." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65670.

Full text
Abstract:
If a single subsurface flaw is detected that is close to the component free surface, a flaw-to-surface proximity rule is used to determine whether the flaw should be treated as a subsurface flaw, or transformed to a surface flaw. The transformation from subsurface to surface flaw is adopted as flaw-to-surface proximity rules in all fitness-for-service (FFS) codes. These proximity rules are used under the condition of the component free surface without stress concentration. On the other hand, subsurface flaws have been found under the notches, such as roots of bolts, toes in welded joints or geometrical discontinuities of components. The stress intensity factors of the subsurface flaws are affected by the stress concentrations caused by the notches. The interaction of stress intensity factor increases with increasing stress concentration factor and decreasing the ligament distance between the tips of the subsurface flaws and the notches for a given notch width. Such subsurface flaws shall be transformed to surface flaws at far distance of the notch tips for conservative evaluations. This paper shows the interactions of stress intensity factors of subsurface flaws under stress concentration fields. Based on the interaction, a flaw-to-surface proximity criterion for a circular flaw is proposed under the stress concentration field induced by a notch.
APA, Harvard, Vancouver, ISO, and other styles
2

Kamel, Simon, Catrin Davies, Hyeong Lee, and Kamran Nikbin. "Effect of Crack Extension in a Compact Tension C(T) Specimen Containing a Residual Stress on the Stress Intensity Factors." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25157.

Full text
Abstract:
Compact tension C(T) specimens with a blunt notch are mechanically pre-compressed to introduce a tensile residual stress ahead of the notch. The specimens are then thermally soaked which results in crack extension due to the presence of the tensile residual stress. Neutron diffraction measurements are performed on the pre-compressed specimens and after thermal soaking, to determine the redistribution of the residual stress as the crack extends. Stress intensity factors (SIF’s) are estimated using an upper-bound linear distribution to model the redistribution of residual stress as the crack extends. These are compared with the SIF’s using a membrane stress of yield magnitude which ignores redistribution of residual stress with crack extension.
APA, Harvard, Vancouver, ISO, and other styles
3

Ekwaro-Osire, S., M. P. H. Khandaker, and K. Gautam. "Probabilistic Analysis of Notched Micro Specimen Under Three-Point Loading." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85493.

Full text
Abstract:
Stress singularity arises in MEMS devices due to sudden geometric and material variation. Sharp notches are common example of sudden geometric variation, which often occurs during the fabrication process of MEMS components. The magnitude of the stress field induced due to stress singularity is given by the value of the notch stress intensity, K. The stress intensity is depended on the notch geometry and the type of loading (mode I, mode II and mode III). Fracture failure at the notch occurs when notch stress intensity reach fracture toughness, KC. An electrostatically actuated test device used for the analysis of a notched micro beam specimen under three-point loading will be presented. The objective of this study was to investigate the effect of geometric configuration on the stress field around singularity for a micro beam specimen by asymptotic, numerical and probabilistic analysis. The scope of work is fourfold. First, the effect of notch angle on the strength of the singularity is determined using two different asymptotic analysis methods — complex potential method and Airy stress function method. Second, the effect of the angular variation (for different notch angle) on the influence coefficients is determined using analytical methods. Third, the effect of the notch angle and depth on the stress intensity factor is determined using finite element methods and contour integral method. Fourth, the probabilistic analysis of maximum stress developed in the micro beam specimen is performed.
APA, Harvard, Vancouver, ISO, and other styles
4

Garnadt, Florian, Christian Kontermann, Henning Almstedt, and Matthias Oechsner. "Application and Verification of an Engineering Approach to Assess Notch Support for Low Cycle Fatigue Loadings." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15402.

Full text
Abstract:
Abstract Notches according to the design of components often represent the failure location. If a crack is nucleating in the area of a notch, crack growth speed is a function of the stress gradient. The difference in allowable cycles between a notched and an unnotched structure can be quantified by a notch support factor. The approach presented in this paper is based on the determination of the stress intensity factor of a short crack in the vicinity of a notch using FEA. To consider the influence of plasticity induced crack closure the analytical approach by Newman is employed. This relatively easy and straight-forward approach is benchmarked in two ways. First, the results are compared with a series of experimental data produced for notched round bar specimens made of a forged steel. Here, crack growth is measured by using the alternating current potential drop method. Second, crack growth is calculated with a full numerical approach. The results are discussed in detail to investigate the application range of the easy-to-use Engineering Approach to compute notch support factors for real component structures.
APA, Harvard, Vancouver, ISO, and other styles
5

Corleto, Carlos R., and Brian B. Cole. "Scratch Tip Radius Effects on K-Controlled Slow Crack Growth in PE Pipe." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48577.

Full text
Abstract:
A study to evaluate the effect of scratch tip radius on stress intensity factor (K) controlled slow crack growth (SCG) was performed to establish whether a plastics pipe industry practice to allow scratches 10% the thickness of the pipe, could still be allowed on large diameter pipes with blunt scratches. A series of finite element analyses were done using a 1/4 two-dimensional (2-D) notched pipe model assuming a 12-in diameter pipe with a standard dimentional ratio (SDR) of 11, a notch ten times smaller than its thickness, notch tip ratios ranging from 16 to 0.0459, and linear elastic material behavior. Results indicate K-controlled SCG would occur if the ratio of notch tip radius to notch depth is less than 0.1667, although this ratio is probably very conservative due to scratch tip blunting from the formation of a craze zone ahead of crack tips in polyethylene (PE) pipes. However, for ratios greater than 0.5, ductile failures could be induced for internal pressures yielding high hoop stresses and at high temperatures. This is due to the fact that stress concentration factors for relatively blunt notches can still induce maximum scratch tip stresses several times higher than the hoop stress of an unscratched pipe. The results of this finite element analysis could be validated experimentally using ASTM D2837-01 following notching procedures given in ISO 13479 with modified cutters to obtain several notch tip radii.
APA, Harvard, Vancouver, ISO, and other styles
6

Keller, Scott G., and Ali P. Gordon. "An Experimental Approach for Delayed Stress Corrosion." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25814.

Full text
Abstract:
Failures of structural and mechanical components have long been attributed to environmentally assisted cracking (EAC). The umbrella of EAC encompasses several phenomena, including stress corrosion cracking (SCC), corrosion fatigue (CF), hydrogen embrittlement (HE) and liquid metal embrittlement (LME). The latter, LME, has resulted in the failure of components in petrochemical and aeronautical industries, among others. The effects are detrimental, with crack tip velocities on the order of centimeters per second and failures occurring rapidly. Previous research has provided numerous underlying microstructural failure mechanisms aimed at identifying the true failure mode. Conflicting experimental data has extended the debate over the true mechanism promoting renewed interest in novel experimental regimes. Utilizing fracture mechanics specimens, the solid-liquid Al-Hg couple was analyzed to extend or reject current theories. Through the implementation of an original environmental chamber capable of testing notched and pre-cracked components in corrosive environments, C(T) specimens were subjected to experiments submersed in liquid mercury. Upon the application of an initially applied stress intensity factor (under load-control), incubation periods preceding failure were observed. Crack initiation and propagation were observed to occur along the starter notch, as well as other regions on the specimen. Results provided evidence that additional factors, such as a critical load or critical microstructural orientation, were factors in crack initiation and propagation. In the quest to observe the influence of these additional factors, a variation of the experimental setup was implemented and initial tests have begun.
APA, Harvard, Vancouver, ISO, and other styles
7

Matsuno, Hiroshi. "A Practical Criterion on Fatigue Crack Growth Rates at Notches and Its Application to Part-Through-Thickness Fatigue Cracks in Notched Plates Subjected to Cyclic Bending." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93499.

Full text
Abstract:
In the present paper, an equivalent stress ratio concept, which has hitherto been developed by author [1–3], is applied to problems of part-through-thickness fatigue crack growth in notched plates subjected to cyclic bending loads, and a criterion for estimating fatigue crack growth rates is derived on the basis of the concept. In order to take a great variety of practical notches into consideration, a bending stress field of a notched plate containing a part-through-thickness fatigue crack emanating from a notch root is simplified by the elementary beam theory, and the stress field is characterized in accordance with classification of notch morphology: (a) an unnotch type, (b) a transverse type notch such as a groove, a shoulder, a trapezoidal protuberance, etc., which is disposed along a width of a plate, and (c) a through-thickness type notch such as a circular and elliptical hole, a side-groove, etc. Experimental results on part-through-thickness fatigue cracks emanating from artificial flaws at notch roots in plates subjected to cyclic bending loads are analyzed. Growth rates of fatigue cracks in the notches are estimated based on the proposed criterion and the devised convenient method for calculating stress intensity factors, and they are compared with experimental ones.
APA, Harvard, Vancouver, ISO, and other styles
8

Owolabi, Gbadebo, Benedict Egboiyi, Horace Whitworth, and Olanrewaju Aluko. "On Fatigue Strength Reduction Factor: State of the Art." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85893.

Full text
Abstract:
Numerous theoretical models have been developed to predict the fatigue strength reduction factor (also known as fatigue notch factor), an important parameter in fatigue life prediction of notched components. These models include: the classical average stress method, the fracture mechanics method, the stress field intensity method, the strain energy method, and the weakest link method. However, most of these methods do not incorporate explicit sensitivity to materials microstructure. Accordingly, notch sensitivity remains a highly empirical subject in spite of significant advances in microstructure-sensitive modeling. This paper gives a detailed literature review of these methods and addresses their limitations. It also discusses a recently developed probabilistic method for microstructure-sensitive fatigue notch factor. The probabilistic method provides a very strong physical basis for fatigue strength reduction and associated notch sensitivity; thus it can be used to determine the effect of notches on reduction of fatigue resistance in a way that directly incorporates microstructure. The results obtained using the new probabilistic framework and other conventional methods are compared with experimental data for notched components. The probabilistic framework gives better correlation with experimental results for the notch sensitivity and notch size effect than the conventional approaches including the Neuber’s, the Peterson, and the fracture mechanics methods.
APA, Harvard, Vancouver, ISO, and other styles
9

Zaki, A. S., and H. Ghonem. "A Model for Fatigue Crack Initiation From Notches." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/nde-25805.

Full text
Abstract:
Abstract A model is developed to predict the number of cycles for fatigue crack initiation from a notch. It is based on the concept that the initiation of a fatigue crack occurs when the accumulated plastic shear deformation in the notch root reaches a critical limit which is defined in terms of the threshold stress intensity factor of the material under consideration. A viscoplastic analysis using unified constitutive equations is employed in order to describe the evolution of the notch plastic zone size as well as the stress and plastic strain distributions within this zone on cycle by cycle basis. This analysis takes into consideration the material s time- and cyclic-dependent characteristics. Experimental verification of the model was carried out using specimens made of AM350, an austenitic steel alloy: A series of crack growth measurements were performed in order to calculate the threshold stress intensity factor which is then used to determine the plastic deformation limit of this alloy. The model is used to calculate the number of cycles to crack initiation which is compared to that obtained experimentally under various loading parameters. The correlation between the model prediction and the experimental results are reported and discussed.
APA, Harvard, Vancouver, ISO, and other styles
10

Hattori, T., and M. Yamashita. "Fatigue Strength Evaluation Methods Using Stress Distributions." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40114.

Full text
Abstract:
The stress and displacement fields near the bonding edge, sharp notch, and contact edge show singularity behaviors, so methods of evaluating the strength of these points using maximum stresses calculated by a numerical stress analysis, such as the finite element method, are generally not valid. We have previously presented a new method of evaluating the strength of these singular points using two stress singularity parameters H and λ and developed a method of formulating critical stress-singularity parameter Hth for each order of stress singularity λ by utilizing critical distance stress theories (point method and line method), which can be derived from two typical strength parameters, namely, fatigue limit σw0 and threshold stress-intensity factor range ΔKth. These estimated critical Hth (λ) value agreed well with the experimentally measured value. Using these simple critical distance stress approach we estimated the fatigue strength of general stress concentration structures such as, round hole, elliptical hole, V notch and contact edge structures. Then these critical distance stress approaches are applied to estimate the size effects of structures. And the eligibility of these estimated results are confirmed by comparing these estimated results with the experimental results. Finally these estimated results and experimental results are compared with the estimated results by other researchers such as, Neuber, Siebel, Ishibashi and Heywood. And we can confirm the superiority of this critical distance stress approach.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Notch stress intensity factors"

1

Fawaz, S. A., and J. J. de Rijck. Stress Intensity Factors and Crack Interaction in Adjacent Holes. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada380271.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Smith, C. W., D. M. Constantinescu, and C. T. Liu. Stress Intensity Factors and Crack Paths for Cracks in Photoelastic Motor Grain Models. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada410794.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Smith, C. W., K. T. Gloss, D. M. Constantinescu, and C. T. Liu. Stress Intensity Factors for Cracks Within and Near to Bondlines in Soft Incompressible Materials. Fort Belvoir, VA: Defense Technical Information Center, June 2000. http://dx.doi.org/10.21236/ada410444.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Pu, S. L. Stress Intensity Factors at Radial Cracks of Unequal Depth in Partially Autofrettaged, Pressurized Cylinders. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada157866.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dadfarnia, Mohsen, Kevin A. Nibur, Christopher W. San Marchi, Petros Sofronis, Brian P. Somerday, James W. ,. III Foulk, and Gary A. Hayden. Measurement and interpretation of threshold stress intensity factors for steels in high-pressure hydrogen gas. Office of Scientific and Technical Information (OSTI), July 2010. http://dx.doi.org/10.2172/993303.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Cramer, Grant R., and Nirit Bernstein. Mechanisms for Control of Leaf Growth during Salinity Stress. United States Department of Agriculture, September 1994. http://dx.doi.org/10.32747/1994.7570555.bard.

Full text
Abstract:
In the project "Mechanisms for Control of Leaf Growth during Salinity Stress" ionic and enzymatic changes in the cells and cell walls of the expanding region of salt-stressed maize leaves were evaluated. Conventional numerical techniques for REG estimation were reevaluated; 'Greens' method was recommended and applied throughout the project for growth intensity estimation. Salinity slowed leaf development and reduced leaf size, but increased cell development within the leaf-growing zone. Leaf elongation rate was most affected by salinity from the region of maximal growth to the distal end; the basal region was largely unaffected. Creep assays indicated that the physical properties of the cell wall were not altered. Furthermore, pH or protein concentrations in the apoplastic space were not altered. Salinity decreased in half the concentrations of putative oligosaccharides in both the apoplast and the Golgi vesicles, suggesting that salinity reduced oligosaccharide biosynthesis. Salinity significantly increased solute concentrations in the vacuoles, but the ion concentrations tested remain unchanged in the vacuole. Most importantly, salinity increased the ion concentrations in the apoplast, particularly Cl-concentrations. The evidence obtained clearly points to the biochemical and ionic components of the apoplast as otential factors controlling leaf elongation of salt-stressed plants.
APA, Harvard, Vancouver, ISO, and other styles
7

Christopher, David A., and Avihai Danon. Plant Adaptation to Light Stress: Genetic Regulatory Mechanisms. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586534.bard.

Full text
Abstract:
Original Objectives: 1. Purify and biochemically characterize RB60 orthologs in higher plant chloroplasts; 2. Clone the gene(s) encoding plant RB60 orthologs and determine their structure and expression; 3. Manipulate the expression of RB60; 4. Assay the effects of altered RB60 expression on thylakoid biogenesis and photosynthetic function in plants exposed to different light conditions. In addition, we also examined the gene structure and expression of RB60 orthologs in the non-vascular plant, Physcomitrella patens and cloned the poly(A)-binding protein orthologue (43 kDa RB47-like protein). This protein is believed to a partner that interacts with RB60 to bind to the psbA5' UTR. Thus, to obtain a comprehensive view of RB60 function requires analysis of its biochemical partners such as RB43. Background & Achievements: High levels of sunlight reduce photosynthesis in plants by damaging the photo system II reaction center (PSII) subunits, such as D1 (encoded by the chloroplast tpsbAgene). When the rate of D1 synthesis is less than the rate of photo damage, photo inhibition occurs and plant growth is decreased. Plants use light-activated translation and enhanced psbAmRNA stability to maintain D1 synthesis and replace the photo damaged 01. Despite the importance to photosynthetic capacity, these mechanisms are poorly understood in plants. One intriguing model derived from the algal chloroplast system, Chlamydomonas, implicates the role of three proteins (RB60, RB47, RB38) that bind to the psbAmRNA 5' untranslated leader (5' UTR) in the light to activate translation or enhance mRNA stability. RB60 is the key enzyme, protein D1sulfide isomerase (Pill), that regulates the psbA-RN :Binding proteins (RB's) by way of light-mediated redox potentials generated by the photosystems. However, proteins with these functions have not been described from higher plants. We provided compelling evidence for the existence of RB60, RB47 and RB38 orthologs in the vascular plant, Arabidopsis. Using gel mobility shift, Rnase protection and UV-crosslinking assays, we have shown that a dithiol redox mechanism which resembles a Pill (RB60) activity regulates the interaction of 43- and 30-kDa proteins with a thermolabile stem-loop in the 5' UTR of the psbAmRNA from Arabidopsis. We discovered, in Arabidopsis, the PD1 gene family consists of II members that differ in polypeptide length from 361 to 566 amino acids, presence of signal peptides, KDEL motifs, and the number and positions of thioredoxin domains. PD1's catalyze the reversible formation an disomerization of disulfide bonds necessary for the proper folding, assembly, activity, and secretion of numerous enzymes and structural proteins. PD1's have also evolved novel cellular redox functions, as single enzymes and as subunits of protein complexes in organelles. We provide evidence that at least one Pill is localized to the chloroplast. We have used PDI-specific polyclonal and monoclonal antisera to characterize the PD1 (55 kDa) in the chloroplast that is unevenly distributed between the stroma and pellet (containing membranes, DNA, polysomes, starch), being three-fold more abundant in the pellet phase. PD1-55 levels increase with light intensity and it assembles into a high molecular weight complex of ~230 kDa as determined on native blue gels. In vitro translation of all 11 different Pill's followed by microsomal membrane processing reactions were used to differentiate among PD1's localized in the endoplasmic reticulum or other organelles. These results will provide.1e insights into redox regulatory mechanisms involved in adaptation of the photosynthetic apparatus to light stress. Elucidating the genetic mechanisms and factors regulating chloroplast photosynthetic genes is important for developing strategies to improve photosynthetic efficiency, crop productivity and adaptation to high light environments.
APA, Harvard, Vancouver, ISO, and other styles
8

FATIGUE PERFORMANCE OF RIB-TO-DECK JOINTS STRENGTHENED WITH INTERNAL WELDING. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.268.

Full text
Abstract:
"Rib-to-deck joints of orthotropic steel decks (OSDs) in steel bridges are susceptible to longitudinal fatigue cracking, which often results in considerable costs as well as traffic interruption. This paper numerically simulated the Crack II of rib-to-deck joint and analyzed the crack failure mode of the joint. To mitigate such cracking, a strengthening method using internal welding was investigated. The effects of initial crack size, internal weld size and crack depth on the stress intensity factor (SIF) of crack tip on rib-to-deck fatigue details were studied by finite element method. The finite element analysis demonstrated that the proposed method can significantly improve the detailed stress range of the weld root, lead to the transfer of crack development mode, and prolong the fatigue life of rib-to-deck joints. Numerical analysis validated the beneficial effect of strengthening measures on the stress intensity factors at crack tips. Calculation of stress intensity factors at crack tips resulted that the crack development law, and the application range of reinforcement method was analyzed. This study provided a reference to the design and application of internal welding in the strengthening of weld details in OSDs."
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Notch stress intensity factors' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography