Relevant bibliographies by topics / Contour of plastic zone

Contents

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

Academic literature on the topic 'Contour of plastic zone'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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 'Contour of plastic zone.'

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 "Contour of plastic zone"

1

DO, TIEN DUNG, RENE LEROY, and DAMIEN JOLY. "COMPUTATIONAL CONTOUR OF MIXED MODE CRACK-TIP PLASTIC ZONE FOR ALUMINUM ALLOY 2024T351." International Journal of Computational Materials Science and Engineering 02, no. 01 (2013): 1350003. http://dx.doi.org/10.1142/s2047684113500036.

Full text
Abstract:
The studies on mixed mode crack-tip plastic zones are one of the fundamental importance in describing the process of failure and in evaluation of the material life. The approach is also applied to predict crack initiation under mixed mode loading. The objective of this work is to study the contour of mixed mode crack-tip plastic zones, the minimum plastic zone radius (MPZR) and the direction of initial crack for aluminum alloy 2024T351 in Compact tension specimen by using Matlab software. This paper computed the shape, size of plastic zone at crack-tip and the minimum plastic zone radius with reference to the loading angle and stress intensity factor in linear elastic fracture mechanics regime for plane strain condition according to Von Mises yield criteria, the study is conducted for various loading angle. We found that the mixed mode loading (β = 60°) can lead to material fracture earlier than any mode loading.
APA, Harvard, Vancouver, ISO, and other styles
2

Zhang, Dong Ming, Hong Fu He, Jiang Chen, and Yan Zeng Wang. "Simulation Analysis of Slope Stability Based on Strength Reduction." Advanced Materials Research 396-398 (November 2011): 2213–16. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.2213.

Full text
Abstract:
The characteristic of the stress and strain distribution of rock landslide are simulated by ANSYS finite element software, while its variation and distribution of plastic zone are analyzed by shear strength reduction method at the same time, which are used to search out the most dangerous slip surface. Calculation results show that: (1)Geotechnical landslide along the interface has decline; the stress increases by the depth of the slope and presents the layered distribution in the X, Y directions. (2)According to the contours of the plastic strain, the plastic strain contour ridge is the most dangerous slip surface. (3)Safety coefficients are offered by calculating the non-convergence, the maximum horizontal displacement and horizontal displacement of feature point mutation in slope failure criterion, to provide the basis for the landslide hazard warning.
APA, Harvard, Vancouver, ISO, and other styles
3

Mir-Salim-zade, Minavar V. "Elastic-Plastic Problem for a Stringer Plate with a Circular Hole." Journal of Mechanical Engineering 24, no. 3 (2021): 61–69. http://dx.doi.org/10.15407/pmach2021.03.061.

Full text
Abstract:
When calculating the strength of machines, structures and buildings with technological holes, it is important to take into account the plastic zones that emerge around the holes. However, the unknown shape and size of the plastic zone complicate the solution of elastic-plastic problems. This paper gives an approximate method and solution of the plane elastic-plastic problem of the distribution of stresses in a thin plate, reinforced with a regular system of stiffeners (stringers). The stringer plate under consideration has a circular hole, which is completely surrounded by the zone of plastic deformation. At infinity, the plate is subjected to a uniform tension along the stiffeners. A constant normal load is applied to the contour of the hole. The plate and stringer materials are assumed to be isotropic. The loading conditions are assumed to be quasi-static. It is assumed that the plate is in the plane-stressed state. Taken as the plasticity condition in the plastic zone is the Tresca-Saint-Venant plasticity condition. Methods of perturbation theory, analytic function theory, and the least squares method are used. The solution to the stated elastic-plastic problem consists of two stages. At the first stage, the stress-strain state for the elastic zone is found, and then the unknown interface between the elastic and plastic zones is determined using the least squares method. A closed system of algebraic equations has been constructed in each approximation, the numerical solution of which makes it possible to study the stress-strain state of a stringer plate, with the hole entirely surrounded by the plastic zone, as well as to determine the magnitudes of the concentrated forces that replace the action of the stringers. The interface between the elastic and plastic deformations has been found. The presented solution technique can be developed to solve other elastic-plastic problems. The solution obtained in this paper makes it possible to consider elastic-plastic problems for a stringer plate with other plasticity criteria.
APA, Harvard, Vancouver, ISO, and other styles
4

Ge, Decheng, Fuxing Jiang, Cunwen Wang, et al. "Sliding Impact Mechanism of Square Roadway Based on Complex Function Theory." Shock and Vibration 2021 (January 31, 2021): 1–12. http://dx.doi.org/10.1155/2021/6655694.

Full text
Abstract:
To clarify the process of stress change and plastic zone evolution of square roadways under high-stress conditions, the rotational square expansion plastic zone evolution model of square roadway was established by theoretical analysis, numerical simulation, and engineering verification. The shear slip impact stress criterion of square roadway based on complex variable function theory was studied, and the law of surrounding rock stress distribution, plastic zone expansion, elastic energy density, local energy release rate (LERR), and total energy release of square roadway were analyzed. The results show that the compressive stress is concentrated in the four corners of the roadway after the roadway excavated and transfers with the change of plastic zone. Main shear failures start from the four corners and develop in a rotating square shape, forming square failure zones I and II. The square failure zone I is connected with the roadway contour and rotated 45°. The square failure zone II is connected with the square failure zone I and rotated 45°. When the original rock stress is low, the surrounding rock tends to be stable after the square shear slip line field formed. When the original rock stress is high, the shear failure of the surrounding rock continues to occur after the square failure zone II formed, showing a spiral slip line. Corners of the square roadway and square failure zones I and II are the main energy accumulation and release areas. The maximum elastic energy density and LERR increase exponentially with the ratio of vertical stress to uniaxial compressive strength (Ic). When square corners of the roof are changed to round corners, the plastic zone of the roof expands to form an arch structure. The maximum elastic energy density decreases by 22%, which reduces the energy level and possibility of rock burst. This study enriches the failure mechanism of roadway sliding impact. It can provide a basic theoretical reference for the design of the new roadway section and support form based on the prevention of rock burst.
APA, Harvard, Vancouver, ISO, and other styles
5

Chanyshev, Anvar, and Ilgizar Abdulin. "TWO VARIANTS OF OUT-OF-LIMIT DEFORMATION OF SOLID AROUND WORKING." Interexpo GEO-Siberia 2, no. 5 (2019): 81–88. http://dx.doi.org/10.33764/2618-981x-2019-2-5-81-88.

Full text
Abstract:
In the paper stress-strain behavior of solid around working in case of out-of-limit deformation when flat strain occurs is studied. Two limit variants are considered: when modulus of volumetric compression has much more value than modulus of decrease and vice a versa. In the first variant sizes of solid destruction zone are obtained, depending on limit strains of elasticity and strength of solid material. In the second variant solution at destruction zone differs from traditional elastic plastic solutions by maximal tangential stress increases with increasing of distance from working contour.
APA, Harvard, Vancouver, ISO, and other styles
6

Xingdong, Zhao, Deng Lei, and Zhang Shujing. "Stability analysis of underground water-sealed oil storage caverns in China：A case study." Energy Exploration & Exploitation 38, no. 6 (2020): 2252–76. http://dx.doi.org/10.1177/0144598720922307.

Full text
Abstract:
The stability of underground water-sealed oil storage caverns is of great importance for safe excavation and operation. To analyze the scope of the failure zone and underground cavern stability accurately, a new method was developed that integrates the rock tunneling quality index Q-system and stability graph method with 3D laser scanning and numerical simulation. The point cloud data were obtained by 3D laser scanning, and the cavern model was built by using DIMINE software, which directly shows the 3D shape of the cavern. The rock mass physical and mechanical parameters and the corresponding stability coefficients were obtained based on Q-system and stability graph method. The plastic zone distribution and deformation characteristics of surrounding rock were analyzed through numerical simulation. Then, the corresponding relationship between caving zone and plastic zone was determined by comparing the numerical simulation results with the 3D laser scanning contour. The new method provides a reliable way to analyze the stability of the underground water-sealed oil storage cavern and also will helpful to design or optimize the subsequent support.
APA, Harvard, Vancouver, ISO, and other styles
7

Jiang, An Nan, Hong Wei Yang, Hong Fu Xin, and Bing Bai. "Three Dimensional Elastic-Plastic Numerical Simulation of Tunnel Excavation Sequence of Dalian Speed Railway." Applied Mechanics and Materials 170-173 (May 2012): 1474–78. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.1474.

Full text
Abstract:
Dalian speed railway tunnel is located in complex soft rock and soil, the road foundation deform and surrounding rock stability control is a concern problem. Along with the unloading process of excavation, surrounding rock moving to inner hole, while exceeding the elastic limitation, the plastic deform and the surrounding rock destroy then occurred. The paper adopted three dimensional elastic-plastic method based on Mohr-Coulomb yielding criterion and carried out numerical simulation of excavation process, in order to analyze and compare the surrounding rock vertical displacement contour, ground surface settlement and damage zone corresponding to different construction sequence. The elastic-plastic numerical method can reflect the damage and destroy character of nonlinear soil material of surrounding rock corresponding to different construction scheme, the simulation result has active guiding meaning for the Dalian speed railway tunnel construction design and dynamic analysis.
APA, Harvard, Vancouver, ISO, and other styles
8

Yang, Zai Q., Yong X. Li, Xiao P. Xue, Chuan R. Huang, and Bo Zhang. "Wind Loads on Single-span Plastic Greenhouses and Solar Greenhouses." HortTechnology 23, no. 5 (2013): 622–28. http://dx.doi.org/10.21273/horttech.23.5.622.

Full text
Abstract:
Wind tunnel tests were conducted in an NH-2-type wind tunnel to investigate the wind pressure coefficients and their distribution on the surfaces of a single-span plastic greenhouse and a solar greenhouse. Wind pressures at numerous points on the surfaces of the greenhouse models were simultaneously measured for various wind directions. The critical wind speeds, at which damage occurred on the surfaces of single-span plastic greenhouses and solar greenhouses, were derived. To clearly describe the wind pressure distribution on various surface zones of the greenhouses, the end surface and top surface of the plastic greenhouse and the transparent surface of the solar greenhouse were divided into nine zones, which were denoted as Zone I to Zone IX. The results were as follows: 1) At wind direction angles of 0° and 45°, the end surface of the single-span plastic greenhouse was on the windward side, and the maximum positive wind pressure coefficient was near 1. At wind direction angles of 90° and 180°, the entire end surface of the single-span plastic greenhouse was on the leeward side, and the maximum negative wind pressure coefficient was near −1. The maximum positive wind pressure on the end surface of the single-span plastic greenhouse appeared in Zone IV at a wind direction angle of 15°, whereas the maximum negative pressure appeared in Zone VIII at a wind direction angle of 105°. 2) Most of the wind pressure coefficients on the top surface of the plastic greenhouse were negative. The maximum positive and negative wind pressure coefficient on the top surface of the plastic greenhouse occurred in Zones I and II, respectively, at a wind direction angle of 60°. 3) At a wind direction angle of 0°, the distribution of wind pressure coefficient contours was steady in the middle and lower zones of the transparent surface of the solar greenhouse, and the wind pressure coefficients were positive. At a wind direction angle of 90°, the wind pressure coefficients were negative on the transparent surface of the solar greenhouse. A maximum positive wind pressure coefficient was attained at a wind direction angle of 30° in Zone IX, whereas the maximum suction force occurred in Zone VII at a wind direction angle of 135°. 4) The minimum critical wind speeds required to impair the single-span plastic greenhouse and solar greenhouse were 14.5 and 18.9 m·s−1, respectively.
APA, Harvard, Vancouver, ISO, and other styles
9

Wei, Zhang, Zhou Daoqing, and Cai Liang. "Experimental and Numerical Study on Plastic Zone Variation ahead of Fatigue Crack Tip." MATEC Web of Conferences 165 (2018): 06004. http://dx.doi.org/10.1051/matecconf/201816506004.

Full text
Abstract:
The plastic deformation ahead of crack tip is of great significance to analysis of the fatigue crack growth behaviour. Using the in-situ microscopy experiment technique, the variation of strain field in the vicinity of crack tip is investigated within load cycles at the small time scale. The contours of plastic zones are measured through the in-situ observation and digital image correlation (DIC). Finite element method (FEM) is also used to simulate the plasticity ahead of the crack tip. Furthermore, the numerical studies are extended to the single overload case to analyse the effect of large plastic zone on the subsequent crack growth. The evolution of residual stress is extracted by FEM simulation to explore the influence of plastic deformation before, during and after the single overload applied on the following crack propagation. Based on the FEM analysis, a model is proposed to approximate the size of the overload effect zone. Finally, some experimental data and numerical simulations are employed to validate this model.
APA, Harvard, Vancouver, ISO, and other styles
10

Eterashvili, Tamaz, T. Dzigrashvili, and M. Vardosanidze. "The Analysis of Microrack Tip Plastic Zone Formed in Thin Films after LCF Tests of Austenitic Steel Used in NPP I." Key Engineering Materials 417-418 (October 2009): 109–12. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.109.

Full text
Abstract:
The study deals with the TEM characterization of samples after low-cycle fatigue (LCF) tests of austenitic stainless steels used in nuclear power plants (NPP). Microcracks are observed in the TEM thin films prepared from standard cylindrical bulk samples. In plastic zones, at the tips of microcracks, several three-dimensional crystal structure defects are detected: 1. Arched extinction contours, 2. Zone of disorientations, 3. Deformation twins of different orientations, 4. Short micro cracks deviated from the main crack direction. The above defects have been studied using TEM, including micro-diffraction; trace analysis and dark-field techniques. It is shown that the microcrack and the created defects represent the means of relaxation of elastic stresses retained in the sample after LCF. It is also shown that redistribution of stresses leads to the nucleation of microcracks and subsequent creation of all the observed defects. A dislocation scheme of the stresses, detected by the extinction contours at microcrack tip, is proposed. The comparison of the proposed scheme of stress distribution with the TEM micrographs shows a good resemblance. Consequently, a topology of stress distribution at microcrack tip - before formation of plastic zone - is determined. The shape represents a three-leaved figure. Compliances and differences between the proposed scheme and the experimentally observed defects and plastic zone size are discussed based on crystallographic analysis of the respective electron diffraction patterns.
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Contour of plastic zone"

1

Do, Tien Dung. "Etude de la zone plastique en pointe de fissure pour l'alliage d'aluminum 2024T351." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4019/document.

Full text
Abstract:
La taille de la zone plastique en pointe de fissure dans un matériau est directement liée au facteur d’intensité de contrainte pour une configuration donnée. Cette étude utilise la technique d’indentation avec une très faible charge afin d’étudier la taille de la zone plastique cyclique et monotone au voisinage de la fissure. La zone plastique est caractérisée par la relation entre la dureté, le module réduit, le travail élastique, le travail plastique, l’indice de plasticité et la distance par rapport à la pointe de fissure. Les essais sont menés sur une éprouvette CT pour un alliage d’aluminium 2024T351. Dans une étude complémentaire, le contour des zones plastiques en fond de fissure en mode mixte, le rayon minimum de zone plastique (MPZR) et la direction de la fissure initiale pour l’alliage d’aluminium 2024T351 sur un “Compact Tension spécimen” est déterminé en utilisant le logiciel Matlab. Nous avons calculé la forme, la taille de la zone plastique au fond de fissure, le rayon minimum de la zone plastique par rapport à l’angle de chargement et le facteur d’intensité de contrainte en utilisant le critère de Von Mises. L’étude est effectuée pour les divers angles de chargement. Nous avons constaté que le chargement en mode mixte (13 = 600) est le plus néfaste pour le matériau<br>The plastic zone size associated with a propagating crack in a material is directly related to the stress intensity factor for a given configuration. This work utilizes the ultra-low-load indentation techniques to study the cyclic and monotonic plastic zone size at the fatigue crack tip based on the relationship between the hardness, elastic work, plastic work, plasticity index and the distance from the crack tip. The study is conducted essentially on the aluminium alloy 2024T351. In a second part of this work, we study the contour of mixed mode crack-tip plastic zones, the minimum plastic zone radius (MPZR) and the direction of initial crack for the aluminium alloy 2024T351 in a Compact tension specimen by using Matlab software. We have computed the shape, size of plastic zone at crack-tip and the minimum plastic zone radius with respect to the loading angle and stress intensity factor in linear elastic fracture mechanics for plane strain condition according to Von Mises yield criteria, the study is conducted for various loading angle. We found that the mixed mode loading (F36O°) can lead to earlier material fracture earlier than any other biaxial loading
APA, Harvard, Vancouver, ISO, and other styles
2

FERREIRA, SAMUEL ELIAS. "FATIGUE CRACK PROPAGATION MODELLING BY ACCUMULATED DAMAGE INSIDE PLASTIC ZONE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35852@1.

Full text
Abstract:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Após identificar que uma trinca de fadiga permanecia fechada durante parte do ciclo, Elber assumiu que o dano era induzido apenas pela fração do carregamento acima da carga necessária para abrir a trinca. Diversos modelos foram propostos utilizando o Delta Keff como força motriz da propagação, como os modelos da faixa plástica (strip-yield), que são amplamente utilizados para prever vida residual de componentes trincados. Embora o fenômeno do fechamento da trinca esteja provado, sua real importância na propagação da trinca de fadiga ainda é controversa. Outros mecanismos, além do fechamento da trinca, foram utilizados na tentativa de explicar os efeitos de sequência do carregamento na propagação em amplitude variável como o campo de tensão residual à frente da trinca. Mesmo após mais de 50 anos de pesquisas desde a proposição da primeira regra de propagação por Paris ainda não há consenso nem sobre o mecanismo nem sobre a modelagem. Esse trabalho tem como objetivo apresentar uma modelagem para prever propagação da trinca de fadiga com base na hipótese de que o dano acumulado por deformação plástica seria a força motriz para propagação. A modelagem proposta se diferença de outros modelos de acúmulo de dano por permitir que o contato existente entre as superfícies da trinca exerça influência sobre as deformações plástica à frente de sua ponta. Os resultados mostram que a modelagem proposta possui capacidade de reproduzir curvas de propagação semelhante ao modelo strip-yield.<br>After identify that a fatigue crack remains closed during part of the load cycle, Elber assumed the damage was induced only by the cycle part over the load required to open the crack. Several models were developed based on Delta Keff as the strip-yield ones, which are widely used to predict residual lives of cracked components. Although the crack closure phenomenon is well proven its actual significance for the propagation is still controversial. Others mechanisms, beyond the crack closure, were used in trying to explain the sequence effects on variable amplitude crack propagation like the residual stress field ahead of the crack tip. However even after more than 50 years of research since the first propagation rule proposed by Paris there is no neither about the mechanism neither about modelling. This work has the aim of present a modelling to predict fatigue crack growth based on the hypothesis that the damage accumulated by cyclic plastic strain would be propagation the drive force. The modelling proposed differs from others damage accumulation models by allowing the existed contact between the crack surfaces to exercise its influence on plastic strain ahead of the crack tip. The results show that the proposed model is able to reproduce propagation curves similar to the model strip-yield.
APA, Harvard, Vancouver, ISO, and other styles
3

Shah, K. "Experimental and numerical characterisation of the plastic zone of a fatigue crack at various values of strain hardening exponent." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3022033/.

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

Heaverlo, Nicholas D. "Stress and strain rate estimates associated with penetrative deformation of the Harkless quartzite aureole rocks, Papoose Flat Pluton, California/Using structure contour maps to analyze subsurface 3D fault geometry along segments of the Moine Thrust." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/48425.

Full text
Abstract:
Dynamically recrystallized quartz microstructures preserved in contact aureoles allow for stress and strain rate estimates associated with penetrative deformation of rocks surrounding pluton margins. Microstructural analysis of the Harkless quartzites surrounding the western margin of Papoose Flat pluton indicates that recrystallization occurred by grain boundary migration with mean recrystallized grain size ranging from 86-225 µm. The application of three calibrated piezometers results in differential stress estimates between ~11 and ~29 MPa. Published wet-quartzite dislocation creep flow laws combined with deformation temperature, water fugacity, and differential stress estimates infer strain rates that range from 1.2 x 10⁻¹⁴ s⁻¹ to 2.3 x 10⁻¹² s⁻¹. In order to analyze 3D subsurface fault geometry along map-pattern curves (salients and recesses), a structure contour map of the Moine thrust, extending from the North Coast southwards to the Dundonnel area, was constructed from 1:50,000 scale British Geological Survey (BGS) maps by correlating between elevation control points constrained by the intersection of the fault trace with topographic contours. The structure contour map indicates significant lateral variation in fault geometry along the Moine thrust, with recesses associated with antiformal corrugations in the subsurface and salients characterized by planar geometries or broad synformal corrugations. Additionally, structure contour maps constructed on the Glencoul thrust, as depicted by original BGS maps confirms that the thrust segments to the NE and SW of Loch Glencoul are part of the same structure, rather than different structures separated by a lateral ramp as shown on more recent BGS maps.<br>Master of Science
APA, Harvard, Vancouver, ISO, and other styles
5

Wang, Yandong. "Experimental and numerical investigation of panel zone behavior and yielding mode classification for steel beam-column joints." Kyoto University, 2020. http://hdl.handle.net/2433/253267.

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

來海, 博央, Hirohisa KIMACHI, 拓. 田中 та ін. "モードⅡ荷重を受ける長繊維強化複合材料の層間マトリックスき裂先端での塑性領域". 日本機械学会, 2000. http://hdl.handle.net/2237/9170.

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

來海, 博央, Hirohisa KIMACHI, 拓. 田中 та ін. "モードⅠき裂を有する長繊維強化複合材料における塑性領域の弾塑性有限要素法解析". 日本機械学会, 2000. http://hdl.handle.net/2237/9173.

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

Stec, Mateusz. "Micromechanical modeling of cleavage fracture in polycrystalline materials." Doctoral thesis, Stockholm : Hållfasthetslära, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9773.

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

Lados, Diana Aida. "Fatigue crack growth mechanisms in Al-Si-Mg alloys." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0204104-125758.

Full text
Abstract:
Thesis (Ph. D.)--Worcester Polytechnic Institute.<br>Keywords: Microstructure; Elastic-Plastic Fracture Mechanics; Crack closure; A356; J-integral; Conventionally cast and SSM Al-Si-Mg alloys; Residual stress; Heat treatment; Fatigue crack growth mechanisms; Threshold stress intensity factor; Plastic zone; Paris law; Fracture toughness; Roughness. Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
10

Wallin, Harald. "An investigation of friction graphs ranking ability regarding the galling phenomenon in dry SOFS contact : (Adhesive material transfere and friction)." Thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2790.

Full text
Abstract:
<p>The main purpose of this project is to investigate different tool steels in terms of their ability to withstand material transfer buildup, so-called galling, occurring in SMF (sheet metal forming) operations. The ability to withstand galling is vital to optimize cost-effectiveness and increase the work tool’s effective operational time. This investigation studies four different tool steels, including a TiN-coating, with the intention of evaluating the microstructures, chemical composition and hardness effect on galling resistance in dry conditions using a slider-on-flatsurface (SOFS) tribo-tester which measures the coefficient of friction during sliding.</p><p>An OP (optical profilometer) was used to measure the size and geometry of lump growth on the tool and damage on the work sheet. A scanning electron microscope (SEM) was used to identify the interacting tribological mechanisms exhibited at different stages during the slide. The SEM figures confirmed three different types of characteristic patterns exhibited in the tracks after tribo- testing which were categorized as mild adhesive, abrasive and severe adhesive damage.</p><p>A SEM figure that illustrates a ragged contact surface and an obvious change in the sheet materials plastic behavior is in this report regarded as a sign of severe adhesive contact, the characteristics could possibly be explained by local high temperature and high pressure followed by a sudden pressure drop and creation of hardened welds or solders between the two surfaces which increase the frictional input needed for further advancement. Friction coefficients observed in the initial 100% mild adhesive stage were, μ=0,22-0,26 succeeded by abrasive SEM characteristics often in association with mild adhesive contact and friction values between μ=0,25-0,4 which where sometimes followed by severe adhesive SEM characteristics in 100% of the contact zone with friction values between μ=0,34- 0,9 respectively. The tool material that performed best according to the friction detection criteria was Sv21 closely followed by Sleipner (TiN coated) and Va40 (HRC 63.3). Unfortunately was the friction criteria, a significant raise in friction for defining a sliding length to galling, not adequate for dry conditions due to immediate material transfer succeeded by cyclic changes between partial or 100% abrasive+mild adhesive and severe adhesive contact. The mechanism that change abrasive wear in association with mild adhesive contact, (moderate friction input), to sever adhesive wear, (higher friction input), is dependent on lump shape (lump geometry) and can appear at comparably low speeds 0,04-0,08 [m/s] and low friction energy input (μ=0,34), the magnitude of the change in friction is therefore not always significant and hardly detectable on the friction graph. This was quite unexpected but could be explained by concentration of friction energy rater than the absolute amount. The problem with using friction graphs for galling evaluation was increased even further when a very small lump size and low corresponding rate of material transfer to the tool surface caused a sustainable high raise in friction (μ≈0,3→0,6) on a TiN-coated tool steel called Sleipner.</p><p>A hardly detectable or similar friction raise for Sv21 and Va40 showed much larger corresponding lump size and rate of material transfer. This means that friction graphs demonstrate a clear problem with quantifying lump size [m3] and rate of  material transfer [m3/s]. Another phenomenon called stick slip behavior, material transfer and lump growth followed by a sudden decrease in lump size and transfer of material back to the work sheet, is also not possible to detect on a friction graph. Because a drop in friction can easily be a change in contact temperature and lump attack angle due to a growing lump and not a decreasing lump.</p><p> </p><p>The conclusion, a friction graph is not suited for galling evaluation and ranking in dry SOFS conditions. A ranking should primarily be based on dimensional OP measurements of the cross section of formed tracks and scratches or preferably by repeated OP measurements of the tool surface during a single test, the last revel the exact lump growth history and true lump growth even in the sliding direction.</p><p> </p><br>civilingenjörsexamen
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Contour of plastic zone"

1

Gray, W. Malcolm. Ductile Fracture of Gas Pipelines: Correlation Between Fracture Velocity and Plastic Zone Defined from Tension Test Parameters. Amer Gas Assn, 1985.

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

Unsaturated soil mechanics in geotechnical practice. 2013.

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

Book chapters on the topic "Contour of plastic zone"

1

Saba, Salim C., and Bardia Amirlak. "Migraine Surgery, Zone 1 (Frontal), Zone 2 (Zygomaticotemporal), and Zone 5 (Auriculotemporal)." In Operative Dictations in Plastic and Reconstructive Surgery. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40631-2_140.

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

Saba, Salim C., and Bardia Amirlak. "Migraine Surgery, Zone 3 (Nasoseptal), Zone 4 (Greater Occipital), and Zone 6 (Lesser Occipital)." In Operative Dictations in Plastic and Reconstructive Surgery. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40631-2_141.

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

Papadopoulos, Vissarion, and Michalis Fragiadakis. "Plastic Hinge and Plastic Zone Seismic Analysis of Frames." In Encyclopedia of Earthquake Engineering. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-36197-5_137-1.

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

Papadopoulos, Vissarion, and Michalis Fragiadakis. "Plastic Hinge and Plastic Zone Seismic Analysis of Frames." In Encyclopedia of Earthquake Engineering. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-35344-4_137.

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

Eterashvili, Tamaz, and M. Vardosanidze. "Fatigue Microcrack Plastic Zone Size Determination." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.4145.

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

Fields, R. J., and R. deWit. "Plastic zone formation around an arresting crack." In Non-Linear Fracture. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-017-2444-9_15.

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

Gdoutos, E. E. "Crack Tip Plastic Zone According to Irwin’s Model." In Problems of Fracture Mechanics and Fatigue. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_21.

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

Shlyannikov, Valery N. "Modeling of crack growth by fracture damage zone." In Elastic-Plastic Mixed-Mode Fracture Criteria and Parameters. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45836-4_2.

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

Chiang, F. P., and Y. Z. Dai. "Determination of Plastic Zone at Crack Tip Using Laser Speckle Decorrelation." In Anisotropy and Localization of Plastic Deformation. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_139.

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

Milella, Pietro Paolo. "Crack Tip Plastic Zone Effect on Fatigue Crack Propagation." In Fatigue and Corrosion in Metals. Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2336-9_11.

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

Conference papers on the topic "Contour of plastic zone"

1

Orynyak, Igor, and Andrii Oryniak. "Computational Aspect of Nonlinear Fracture Mechanics Application." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45838.

Full text
Abstract:
The development of powerful commercial computer programs made the concept of J-integral as computational parameter of fracture mechanics to be a very attractive one. It is equivalent to SIF in linear case, it converges in numerical calculation and the same results are obtained by different codes (programs). Besides, it is widely thought that elastic-plastic analysis gives bigger values than elastic SIF ones what is good from regulatory point of view. Such stand was reflected in the recommended by IAEA TECDOC 1627 (February 2010) devoted to pressurized thermal shock analysis of reactor pressure vessels, where the embedded crack in FEM mesh, elastic-plastic analysis with simultaneous determination of J-integral was stated as the best option of analysis. But at that time all the most widely used software were not able to treat the residual stresses, the thermal stresses in case of two different materials. Such a contradiction between requirements and the possibilities made a lot of problems for honest contractors especially in countries where the regulator had no own experience in calculation and completely relied on the authority of international documents. This means that at that time the said recommendations were harmful. The main reason of such a situation was the absence of the carefully elaborated examples. Now the capabilities and accuracy of such software are increasing. Nevertheless, some principal ambiguities and divergences of computations results in various J-integral contours around the crack tip still exist. They are exhibited when the large plastic zone emerges at the crack tip. Other problem is influence of the history of loading and the specification of the time of crack insertion in the mesh including the time of emergence of residual stress. This paper is invitation for discussion of the accuracy and restriction of computational J-integral. With this aim the detailed analysis of some simplified 2D examples of calculation of elastic -plastic J-integral for surface crack with accounting for residual stress, thermal stress and inner pressure are performed and commented. The attainment of consensus among the engineering society for treating the outcome results is the prerequisite for practical application of computational elastic plastic J-integral.
APA, Harvard, Vancouver, ISO, and other styles
2

Wenman, Mark R., and Robert D. Plant. "Simple Model of Lu¨ders Behaviour in a Novel Compact Tension Specimen for Investigation of Residual Stress Effects." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93450.

Full text
Abstract:
Residual stress effects on defects have been investigated by the use of a novel compact tension (CT) specimen. Mild steel CT specimens have been preloaded in compression to generate a plastic zone around the notch prior to precracking. Upon unloading, the specimen contains a residual tensile stress, around the notch tip, into which a defect such as a prefatigue crack can be introduced. The effect of the residual stress on fatigue crack growth and final fracture is then investigated. Here, the uniaxial tensile behaviour of the steel used shows Piobert-Lu¨ders behaviour typical of certain ferritic pressure vessel steels. The mechanical preloading process has been modelled via a finite element (FE) analysis. The plastic deformation behaviour, taken from tensile test data, has been incorporated into the CT specimen model, first ignoring the Lu¨ders behaviour and then including it via a simple plastic model of the phenomenon. The model of Lu¨ders behaviour was tested on a FE model, of an uniaxial tensile test, before it was applied to the CT specimen. The result of this test was the generation of a realistic propagating band of plastic instability along the gauge length of the tensile specimen. Results for FE models of CT specimens, with and without the Lu¨ders behaviour, were then compared to real preloaded CT specimens. The models using only a lower yield point and ignoring Lu¨ders behaviour under predict the deformation of real specimens. The incorporation of plastic data containing an upper yield point predicts with reasonable accuracy the preloading cycle and as a result the shape of the residual stress field generated. Hardness maps have been made, by the use of scanning indentation mechanical microprobe (SIMM), of the free surface, of preloaded specimens. These maps reveal the strain profile of the surface and Lu¨ders bands emanating from the notch region are clearly visible. The FE model of the CT specimen, including Lu¨ders behaviour, shows Von Mises stress contours in a similar pattern to the Lu¨ders bands in the real specimen. Finally, some specimens were precracked, using cyclic compression, and then fractured at lower shelf temperatures (-140°C) to reveal the precrack shape; this matched the predicted shape of the maximum principal stress field responsible for driving crack growth. The lower shelf fracture toughness of preloaded specimens was found to be considerably reduced from reference toughness specimens with no preload. This suggests that the tensile residual stress was dominant over any benefit gained from warm pre-stressing the material.
APA, Harvard, Vancouver, ISO, and other styles
3

Proskokov, Andrey, and Sergey Petrushin. "Chip formation with a developed plastic-deformation zone." In 2012 7th International Forum on Strategic Technology (IFOST). IEEE, 2012. http://dx.doi.org/10.1109/ifost.2012.6357709.

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

Zhakhovsky, Vasily V., Mikalai M. Budzevich, Nail Inogamov, Carter T. White, and Ivan I. Oleynik. "Single two-zone elastic-plastic shock waves in solids." In SHOCK COMPRESSION OF CONDENSED MATTER - 2011: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2012. http://dx.doi.org/10.1063/1.3686502.

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

Astrid Calizaya Torre, Karina. "Plastic Pollution in the Marine Coastal Zone of Peru." In The 3rd Global Virtual Conference of the Youth Environmental Alliance in Higher Education. Michigan Technological University, 2021. http://dx.doi.org/10.37099/mtu.dc.yeah-conference/april2021/all-events/23.

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

Letelier, Mario F., and Juan S. Stockle. "Velocity Field Computation in Plastic Flow in Non-Circular Tubes Using Natural Coordinates." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85405.

Full text
Abstract:
A numerical method to determine the velocity field, and related variables, in plastic flow in non-circular straight ducts is presented. The method is an extension of previous work of the senior author related to modeling laminar flow in pipes of arbitrary cross-sectional contours using natural coordinates. In this case the concept of “natural coordinates” is applied to the system of orthogonal curves determined by the plane isovels and their normal counterparts. The momentum equation for the axial velocity is expressed in natural coordinates in which one relevant variable is the radius of curvature of isovels. The method is applied to a selected set of shapes when the fluid is a Bingham plastic. Isovels and plug zones are determined drawing on the properties of the isolvels and normal curves. Computations start at the pipe perimeter and advance toward the center.
APA, Harvard, Vancouver, ISO, and other styles
7

Hsiao, C. "Growth Of Plastic Zone In Porous Medium Around A Wellbore." In Offshore Technology Conference. Offshore Technology Conference, 1988. http://dx.doi.org/10.4043/5858-ms.

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

Kaneko, T., T. Ichida, and N. Ohara. "Study on ground behavior considering temporary plastic zone around tunnel face." In The 2016 Isrm International Symposium, Eurock 2016. CRC Press, 2016. http://dx.doi.org/10.1201/9781315388502-74.

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

Zhou, Yongqing, Pei-yong Li, Jun-jie Song, Cheng-fang Wang, Yun-sheng Mao, and Zu-quan Xiang. "Research of the Plastic Deformation Zone for Ship Frame Cold Forming." In International Conference on Computer Applications in Shipbuilding 2015. RINA, 2015. http://dx.doi.org/10.3940/rina.iccas.2015.66.

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

Reynolds, Rodger L., and Omer L. Hageniers. "Optical Enhancement Of Surface Contour Variations For Sheet Metal And Plastic Panel Inspection." In SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, edited by Chander P. Grover. SPIE, 1989. http://dx.doi.org/10.1117/12.947591.

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