Relevant bibliographies by topics / Finite-element stress analyses

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

Academic literature on the topic 'Finite-element stress analyses'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Finite-element stress analyses"

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Wang, Zhe Feng, and Yao Yang Hu. "To Research Residual Stress Using Finite Element Analysis." Key Engineering Materials 525-526 (November 2012): 105–8. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.105.

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The residual stress distributions of 7075 aluminum alloy rectangular thick plates after quench-hardening had been simulated firstly, then all the results were presented and compared with each other. Some deep theoretical analyses were also carried out. The results show that complicated residual stress distribution regularities in aluminum alloy thick plates can be obtained by the finite element analysis successfully.
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Angelides, M., A. Shirazi-Adl, S. C. Shrivastava, and A. M. Ahmed. "A Stress Compatible Finite Element for Implant/Cement Interface Analyses." Journal of Biomechanical Engineering 110, no. 1 (February 1, 1988): 42–49. http://dx.doi.org/10.1115/1.3108404.

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A new finite element has been developed to enforce normal and shear stress continuity at bimaterial interface points in order to alleviate the problem of high stress discontinuity predictions by the conventional displacement finite element method. The proposed element is based on a five node isoparametric quadrilateral element where the fifth node is located at the interface boundary of the element. A series of validation tests have been carried out to assess the correctness of the stress distribution obtained by the new element at interfaces of highly dissimilar materials. The results of the tests are compared to analytical solutions and to results from convergence studies performed by the conventional finite element method (SAP-IV). Overall, the proposed element has been demonstrated to have a very satisfactory degree of reliability, especially in view of the observed inability of the conventional method to yield interpretable interface stress values for most cases analyzed. Finally, the new interface element has been applied to the analysis of an axisymmetric model of the knee tibial implant. The superiority of the proposed element over the conventional one has been demonstrated in this case by a convergence study.
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Kahn-Jetter and, Zella L., and Suzanne Wright. "Finite Element Analysis of an Involute Spline." Journal of Mechanical Design 122, no. 2 (January 1, 2000): 239–44. http://dx.doi.org/10.1115/1.533573.

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Two finite element analyses of an involute spline are performed; one is axisymmetrically loaded and the other is nonaxisymmetrically loaded. An entire cross section of both an internal and external pair is analyzed for both models. It is shown that on the axisymmetrically loaded spline the highest stress experienced is the maximum compressive contact stress although the tensile stress in the shaft is also quite high. It is also shown that stress concentrations exist at the root and top of the tooth for both models. Furthermore, on the nonaxisymmetrically loaded spline at low torque, only a few teeth make initial contact, however, as torque is increased, more teeth come in contact. All the stresses remain relatively constant under increasing torque as more teeth are engaged. Once all teeth are in contact stress increases with higher torques. However, the maximum tensile stress (arising from stress concentrations) remains fairly constant, even at high torques, because the stress concentrations that occur at tooth roots appear to be relatively independent of the number of teeth in contact. [S1050-0472(00)00102-1]
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Sikakollu, Ravi Chandra, Lemmy Meekisho, and Andres LaRosa. "Coupled Field Analyses in MEMS With Finite Element Analysis." Journal of Heat Transfer 127, no. 1 (January 1, 2005): 34–37. http://dx.doi.org/10.1115/1.1804204.

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This paper deals with the design and analysis of a horizontal thermal actuator common in MEMS applications using Finite Element Analysis; with the objective of exploring means to improve its sensitivity. The influence of variables like voltage and the dimensions of the cold arm of the actuator unit were examined by comprehensive, coupled thermal-stress analyses. Simulation results from this study showed that the sensitivity of the actuator increases with the applied voltage as well as the width of the cold arm of the thermal actuator. An important observation made from this study is that the size and thermal boundary conditions at the fixed end of the actuator primarily control the stroke and the operating temperature of the actuator for a given potential difference between cold and hot arms. The coupled field analyses also provided a design tool for maximizing the service voltage and dimensional variables without compromising the thermal or structural integrity of the actuator.
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Izzawati, B., Mohd Afendi, S. Nurhashima, A. Nor, Abdul Rahman Abdullah, and Ruslizam Daud. "Evaluation of Adhesive T-Joint Using Finite Element Analysis." Applied Mechanics and Materials 786 (August 2015): 37–42. http://dx.doi.org/10.4028/www.scientific.net/amm.786.37.

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This study evaluates the effect of temperature upon adhesive properties and behavior of adhesively bonded T-joint. Finite element analyses established the effect of this parameter on the durability joint and stress distribution within the adhesive layer. A series of temperatures and stress analyses using finite element analysis (FEA) has been conducted in the T-joint configuration for this purpose. The parametric studies on the FE model revealed that stress distributions are sensitive to the changes in adhesive properties due to changes in temperature. In general, stresses were reduced with changes in the temperature which resulted in the ability of the adhesive layer to undergo plastic deformation.
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Soares, C. J., P. V. Soares, P. C. F. Santos-Filho, and S. R. Armstrong. "Microtensile Specimen Attachment and Shape—Finite Element Analysis." Journal of Dental Research 87, no. 1 (January 2008): 89–93. http://dx.doi.org/10.1177/154405910808700116.

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Microtensile bond strength values are influenced by specimen shape and attachment method to the gripping device during testing. We hypothesized that stress distribution inside the testing specimen is affected by microtensile specimen shape and attachment method. Rectangular, hourglass-, and dumbbell-shaped specimens, all with a 1 mm2 cross-sectional testing region, were modeled as indirect ceramic restorations luted to dentin. Three specimen attachments were investigated: (1) posterior surface; (2) posterior, superior, and lateral surfaces; and (3) all surfaces. Qualitative and quantitative analyses were carried out according to von Mises’ criteria. Stress analysis showed a direct correlation between attachment modes and stress distribution, with shear stresses observed in models with less surface attachment. Increasing the number of faces for specimen attachment to the metallic gripping device resulted in a more homogeneous and regular distribution of stress, with tensile stress concentrated at the adhesive interface. Dumbbell-shaped specimens showed improved stress distribution compared with rectangular and hourglass-shaped specimens.
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Bhuyan, G. S., M. Arockiasamy, K. Munaswamy, and O. Vosikovsky. "Finite element analysis of cracked and uncracked tubular T-joint." Canadian Journal of Civil Engineering 13, no. 3 (June 1, 1986): 261–69. http://dx.doi.org/10.1139/l86-038.

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A welded tubular T-joint is analysed using finite element methods to obtain through-thickness and surface stresses due to axial and in-plane bending loads. The effects of a shallow weld toe crack on the stress redistribution are studied. The two-dimensional analysis of the joint includes the membrane stiffness representation by plane stress element and the flexural stiffness by plate bending element. For the three-dimensional analyses, the joint is modelled using incompatible solid elements to improve flexural characteristics. The embedded elliptical crack front is modelled by straight-line segments. The region at the vicinity of the crack is discretized using special elements, which produce a singular stress field at the crack front. Key words: tubular joint, stress analysis, weld toe crack, incompatible element, singular element.
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Joshi, Makarand G., Michael H. Santare, and Suresh G. Advani. "Survey of Stress Analyses of the Femoral Hip Prosthesis." Applied Mechanics Reviews 53, no. 1 (January 1, 2000): 1–18. http://dx.doi.org/10.1115/1.3097335.

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The finite element method has been used to analyze hip prostheses for the past 25+ years and has proven to be quite effective. The use of finite element analysis, initially, was restricted to duplicating experimental results but has progressed over the decades in step with the computational capabilities as well as the increased understanding of hip replacement procedures. The mechanics of the bone-prosthesis system is quite complicated in the context of the geometry, material properties, loading and the interaction between the femur and the hip stem. The following article is a survey of the finite element technique as applied by researchers over the past three decades, within given limitations, to solve this complex problem. The discussion is limited to the analysis of the femoral component and consists of the approximations, methodologies and conclusions as reported. Relevant experimental results have also been reviewed. There are 136 references cited.
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Rossi, Ana Cláudia, Alexandre Rodrigues Freire, Felippe Bevilacqua Prado, Luciana Asprino, Lourenço Correr-Sobrinho, and Paulo Henrique Ferreira Caria. "Photoelastic and Finite Element Analyses of Occlusal Loads in Mandibular Body." Anatomy Research International 2014 (October 8, 2014): 1–9. http://dx.doi.org/10.1155/2014/174028.

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This study proposed to evaluate the mandibular biomechanics in the posterior dentition based on experimental and computational analyses. The analyses were performed on a model of human mandible, which was modeled by epoxy resin for photoelastic analysis and by computer-aided design for finite element analysis. To standardize the evaluation, specific areas were determined at the lateral surface of mandibular body. The photoelastic analysis was configured through a vertical load on the first upper molar and fixed support at the ramus of mandible. The same configuration was used in the computer simulation. Force magnitudes of 50, 100, 150, and 200 N were applied to evaluate the bone stress. The stress results presented similar distribution in both analyses, with the more intense stress being at retromolar area and oblique line and alveolar process at molar level. This study presented the similarity of results in the experimental and computational analyses and, thus, showed the high importance of morphology biomechanical characterization at posterior dentition.
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Liu, Hong Bo, Chang Hai Zhai, Yong Song Shao, and Li Li Xie. "Finite Element Fracture Mechanics Study of Pre-Northridge Connections." Key Engineering Materials 324-325 (November 2006): 1007–10. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1007.

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The objective was to quantify the variation of stress intensity factor to weld root flaw sizes in steel frame connections. Finite-element analyses were used to study fracture toughness in welded beam-column connections. Investigations of fracture behavior mainly focused on the standard pre-Northridge connection geometry. Finite element analysis was performed using the ANSYS computer program. Stress intensity factor was calculated through a J-integral approach. Results show that stress intensity factor is not uniform and is largest in the middle of beam flange. Stress intensity factor increases nearly linear with the increase of flaw size. Backing bars have little effect on weld fractures.
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Dissertations / Theses on the topic "Finite-element stress analyses"

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Anwar, Sohail. "Transient Stress and Strain Assessment of Marine Boiler : Fully Rigid Body Dynamics Coupled Finite Element Analyses." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95440.

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Operationally, marine components and structures such as boiler in a Ship, are exposed to varying mechanically and thermally induced forces. High-frequency mechanical loading arises from the cyclic pressure, temperature transients, and six directional Rapid Amplitude Operator (RAOs). These types of loadings are mainly in the elastic region usually denoted as high cycle fatigue (HCF), most pronounced during the start-up, and the shut-down sequence of operation, which are responsible for an astronomically  reduction in Marine Boiler’s lifetime as compared to land boiler with same designed operating condition. Therefore, there is a need to determine the limitations of the engineering variables of the boiler with respect to Pressure, temperature, RAOs, and best locational point for the optimization of its designed lifetime during Operation. Detailed knowledge of this interaction between varying temperatures, RAOs and load cases is of considerable importance for precise lifetime calculations.  In order to understand and analyze the material behavior under contentious stress exposure, a general-purpose linear Finite Element (FE) code, LS-DYNA software is used as a pre-processor and solver during the simulation and data are post-processed using stress-based analysis method.
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Rahmanivahid, Pooyan. "Investigation on influence of dental implants." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/13789.

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Osseointegration is defined as the direct physical and practical relation between the living tissue and implant surface. Although, success rate of dental implants is high, implant failure occurs. Overloading implants from occlusal forces are known as one of the main reasons. In order to have successful implant, a dynamic balance must be provided between mechanical and biological elements (Isidor, Flemming 1996). Şimşek et al. reported bone quality, oral sanitation, host medical condition and biomechanical parameters as the main reasons for implants failure. Also, implant fixture micromotion and inappropriate stress in the bone implant interface is known as the potential reasons for early bone loss and implant failure (Şimşek, Barış 2006). Even so, implant position in jawbone, bone density; biomaterial properties of implant surface, treatment technique, loading history and patient clinical status are the influential factors in implant success (Brunski, J.B. 1999). Although there are many studies on stress distribution of implants in bone-implant interface, majority are limited to current implants in the market. However, current designs have been developed by marketing purposes rather than scientific considerations. Therefore, there is need to introduce and analyse new designs in order to optimize implant structure. Recent investigations have shown reliability of FEA method in simulating human jawbone situation. This research aims to develop a new dental implant with better life expectancies and introduce an optimized implant based on FEA stress analyses and experimental tests. Therefore, based on literature recommendations a series of new design factors are defined and analysed. In this study, a primary design is created in AutoCAD and yields to 3 different implants developed in SolidWorks. Branemark MK IV was selected as the bench model to play role of control group. Then, CT-scan images of human jawbone are imported to MIMICS to create a host bone model. Implant and jawbone models are assembled in 3-Matic and exported to Abaqus for final analyses. A series of loadings are defined to examine implant performance in different conditions. Branemark and C-3 implants are manufactured from Titanium for experimental analyses. Mechanical tests on sawbone foam blocks and cadavers are targeted to portray realistic performance. This research demonstrates C-3 model as the optimized dental implant, which presents a new design profile and better performance in low bone densities. The FEA and experimental results validate the benefit of the new design compare to the conventional ones. Furthermore, results can provide a basis for future designers to develop further optimizations.
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Sarker, Pratik. "Investigation of the Quenching Characteristics of Steel Components by Static and Dynamic Analyses." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1942.

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Machine components made of steel are subjected to heat treatment processes for improving mechanical properties in order to enhance product life and is usually done by quenching. During quenching, heat is transferred rapidly from the hot metal component to the quenchant and that rapid temperature drop induces phase transformation in the metal component. As a result, quenching generates some residual stresses and deformations in the material. Therefore, to estimate the temperature distribution, residual stress, and deformation computationally; three-dimensional finite element models are developed for two different steel components – a spur gear and a circular tube by a static and a dynamic quenching analyses, respectively. The time-varying nodal temperature distributions in both models are observed and the critical regions are identified. The variations of stress and deformation after quenching along different pathways for both models are studied. The convergence for both models is checked and validations of the models are done.
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Ribeiro, Marcelo Leite. "Programa para análise de juntas coladas: compósito/compósito e metal/compósito." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-19012011-122529/.

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O presente trabalho consiste basicamente no desenvolvimento de um programa de engenharia denominado SAJ (sistema de análise de juntas) capaz de realizar uma análise detalhada do comportamento de dois dos diversos tipos de juntas coladas existentes, a junta simples colada (\"single lap joint\") e a junta dupla colada (\"double lap joint\"). Sendo que foram analisadas juntas coladas com aderentes de material compósito ou, então, compostas de aderentes de compósitos e metal. O programa de engenharia desenvolvido possibilita o cálculo das tensões, dos esforços e dos deslocamentos nessas juntas. Para validar o referido programa, os resultados obtidos do mesmo foram confrontados com os resultados obtidos para condições semelhantes utilizando \"softwares\" comerciais de elementos finitos e de cálculo de juntas. Após a validação do programa, são apresentados alguns estudos de fatores que influenciam na resistência da junta colada, verificando a influência do comprimento de \"overlap\" (sobreposição), a rigidez do adesivo e a espessura da camada adesiva. Também é apresentada uma análise de falha dos aderentes de compósito evidenciando assim, as potencialidades e limitações desta ferramenta computacional para a área de desenvolvimento de produto.
This work consists on the development of software called SAJ which can analyze a bonded joint behavior in detail, not only for single lap joint, but also, for double lap joint. These joints could be made of composite/composite materials or metal/composite as adherentes. The software developed can calculate the joints stresses, loads and displacements. The results obtained are compared to the results obtained using commercial software and the same problems proposed. After the validation of SAJ, some studies were performed in order to determine how some characteristics affect the joint stresses distribution as overlap length, adhesive elastic modulus, adhesive thickness and a failure analysis of composite adherents showing the potential and limitation of this computational tool for the product development area.
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Gundeboina, Saidulu. "Finite Element Analysis of a Washing Machine Cylinder." Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-4863.

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In this thesis a finite element model of a household washing machine cylinder is built and analysed in ABAQUS 6.9-2. The aim is to help Asko appliances in conducting similar analysis for future manufacturing of high capacity cylinders by reducing experimentation. The analysis is mainly concerned with an evenly distributed load at a constant angular velocity. The load is applied with the help of lead plates instead of clothes. The cylinder is loaded with three thin (2 mm) lead plates weighing 2 kg each. The plates with dimensional 370x240x2 mm are mounted with one strip of double sided foam tape inside the cylinder. To estimate the behavior of the cylinder the strains are measured when the cylinder is rotating at 1620 and 2200 revolution per minute (rpm). To validate the model the numerical analyses are compared with experimental results. The results clearly show that the numerical strain values fit with experimental strain values.
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Barrans, Simon Mark. "Enhancing finite element analysis boundary stress predictions." Thesis, University of Huddersfield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338613.

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Daniels, Michael John. "Accuracy improvements in finite element stress analysis." Thesis, Birmingham City University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327853.

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Pascoe, Steven Keith. "Contact stress analysis using the finite element method." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240266.

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Burstow, Mark C. "A combined boundary element and finite element method for elasto-plastic fracture analysis." Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387269.

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Guzelbey, Ibrahim H. "Finite and boundary element analysis of elasto-plastic finite strain contact problems." Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335006.

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Books on the topic "Finite-element stress analyses"

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Ko, William L. Effect of element size on the solution accuracies of finite-element heat transfer and thermal stress analyses of space shuttle orbiter. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1988.

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Ko, William L. Thermocryogenic buckling and stress analyses of a partially filled cryogenic tank subjected to cylindrical strip heating. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1994.

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Ko, William L. Thermocryogenic buckling and stress analyses of a partially filled cryogenic tank subjected to cylindrical strip heating. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1994.

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Cook, Robert D. Finite element modeling for stress analysis. Chichester: Wiley, 1995.

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Finite element modeling for stress analysis. New York: Wiley, 1995.

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Dooling, P. J. Improved finite element stress analysis forglassypolymers. Manchester: UMIST, 1994.

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Daniels, Michael J. Accuracy improvements in finite element stress analysis. Birmingham: Birmingham Polytechnic, 1989.

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Daniels, Michael John. Accuracy imporvements in finite element stress analysis. Birmiingham: Birmingham Polytechnic, 1989.

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Nicholson, D. W. Finite element analysis: Thermomechanics of solids. 2nd ed. Boca Raton: CRC Press, 2008.

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Nicholson, D. W. Finite element analysis: Thermomechanics of solids. 2nd ed. Boca Raton: CRC Press, 2008.

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Book chapters on the topic "Finite-element stress analyses"

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Ping, X. C., M. C. Chen, and J. L. Xie. "Finite Element Analyses of Multi-Material Wedges and Junctions with Singular Antiplane Stress Field." In Computational Methods in Engineering & Science, 234. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-48260-4_80.

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Bauman, Judson T. "Finite Element Analysis." In Fatigue, Stress, and Strain of Rubber Components, 107–15. München: Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446433403.007.

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Boyle, J. T., and W. M. Cummings. "Finite Element Analysis of Spate Benchmarks." In Applied Stress Analysis, 150–59. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_15.

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Kormi, Kazem, and Mohammed N. Islam. "Finite Element Simulation of Tyre Dynamics." In Applied Stress Analysis, 160–70. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_16.

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Ferreira, Antonio J. M., and Nicholas Fantuzzi. "Plane Stress." In MATLAB Codes for Finite Element Analysis, 171–205. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47952-7_11.

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Hsu, Tai-Ran. "Thermoelastic-Plastic Stress Analysis." In The Finite Element Method in Thermomechanics, 53–112. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-5998-2_3.

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Krishnamachari, S. I. "Finite Element Method: An Introduction." In Applied Stress Analysis of Plastics, 449–521. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3110-4_8.

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Hsu, Tai-Ran. "Coupled Thermoelastic-Plastic Stress Analysis." In The Finite Element Method in Thermomechanics, 253–73. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-5998-2_9.

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Hsu, Tai-Ran. "Elastodynamic Stress Analysis with Thermal Effects." In The Finite Element Method in Thermomechanics, 152–63. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-5998-2_6.

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Nagai, Gakuji. "Piezothermoelastic Analysis: Finite Element Method." In Encyclopedia of Thermal Stresses, 3793–98. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_331.

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Conference papers on the topic "Finite-element stress analyses"

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Farayola, K. K., A. T. Olaoye, and A. Adewuyi. "Petroleum Reservoir Characterisation for Fluid with Yield Stress Using Finite Element Analyses." In SPE Nigeria Annual International Conference and Exhibition. Society of Petroleum Engineers, 2013. http://dx.doi.org/10.2118/167514-ms.

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Faraz, Umar, and Robert Gurdal. "Comparison Between the ASME Code NB-3600 Piping Design Branch Connection Stress Analyses and Finite Element Analyses." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45347.

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Stresses in Class 1 branch connections that consist of large bore run pipe with a reinforced branch nozzle should rarely be limited by the run–branch interface stresses. The end of the “branch nozzle – branch pipe” interface is the location on the branch nozzle one would expect to see the limiting stress. Therefore, it is important that reasonable Design Rules are maintained in the ASME Code Section III for the stress analyses of the Class 1 Piping branch connections to avoid over-predicting the “run pipe - branch nozzle” interface stresses. This will allow the analysts to concentrate on load reductions needed in a logical manner. In Class 1 Piping Design, the calculation of the branch total stress due to the moments is the result of the sum of the stresses from the run moment and of the stresses from the branch moment with these branch moment stresses being calculated using either the branch pipe cross-section or the branch nozzle cross-section. This in itself is already severe, when compared with other Piping Design Rules for branch connections. In addition, starting with the ASME Code year 2002, the branch-side moment stress is based exclusively on the branch pipe cross-section, which leads to a higher moment stress, and this higher moment stress is still absolutely added to the run-side moment stress. As indicated in that ASME Code year 2002 and beyond, this addition is independent of the length of the branch nozzle reinforcement. This leads to total moment stresses that are the sums of moment stresses that do not occur at all at the same location. The purpose of this technical paper is to compare a) the stresses calculated with the earlier more correct Class 1 Piping methodology from 2001 and before 2001; b) the stresses calculated with the more recent and more severe Class 1 Piping methodology; and c) the stresses from finite-element analyses. Conclusions are provided on what should be done for the future Class 1 Piping Design methodology of branch connections.
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Venkataramana, K., V. Bhasin, K. K. Vaze, A. K. Ghosh, and H. S. Kushwaha. "Calculation of B2′ Stress Indices for Elbows Using Finite Element Analysis." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61814.

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Nuclear power plant components are designed to withstand reversed dynamic loading like earthquake loading. Such reversed dynamic loads may induce plastic deformation in nuclear power plant components like pipe elbows. Plastic deformation in nuclear power plant components is limited by equation (9) of ASME Boiler &Pressure Vessel Code, Section III, NB-3652. ASME B&PV Code was revised in the year 2000 to accommodate plastic ratcheting as a mode of failure instead of plastic collapse under reversed dynamic load. The modified Code contains B2′ index, which is given as 2/3 rd of B2 index for butt-welded elbows. In the earlier work [1] B2′ indices were determined for several elbows using quasi-static nonlinear finite element analysis. In the present work an attempt is made to determine the ratio B2/B2′ for elbows using plastic nonlinear dynamic finite element analysis. Elbows of different sizes were considered in the present study. For each elbow linear static, linear dynamic, plastic nonlinear static and plastic nonlinear transient dynamic analyses are carried out to determine B2′ index in terms of B2 index. Elastic-perfectly plastic material model is used for the elbows. Collapse loads are obtained under static and dynamic conditions. Load vs. deflection curves are obtained for elbows under linear static and nonlinear quasi-static analyses. Deflection vs. time-curves are obtained from linear dynamic and plastic nonlinear dynamic analyses. The ratio B2/B2′ is computed for elbows of different sizes. The computed stress indices are compared with the Code values.
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Lewis, Timothy, Xin Wang, and Robert Bell. "Finite Element Analyses of Circumferential Cracks in Thin-Walled Cylinders: T-Stress Solutions." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10539.

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The elastic T-stress is a parameter used to define the level of constraint at a crack tip. It is important to provide T-stress solutions for practical geometries in order to apply the constraint-based fracture mechanics methodology. In the present paper, T-stress solutions are provided for circumferential through-wall cracks in thin-walled cylinders. Cylinders with a circumferential through-wall crack were analyzed using the finite element method. Three cylinder geometries were considered; defined by the pipe radius (R) to wall thickness (t) ratios: R/t = 5, 10, and 20. The T-stress was obtained at eight crack lengths (θ/π = 0.0625, 0.1250, 0.1875, 0.2500, 0.3125, 0.3750, 0.4375, and 0.5000) for remote tension and remote bending loads. These results are suitable for constraint-based fracture analysis for cylinders with circumferential cracks.
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Jeong, Jae-Uk, Jae-Boong Choi, Nam-Su Huh, and Yun-Jae Kim. "Stress Intensity Factors for Complex-Cracked Pipes Based on Elastic Finite Element Analyses." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45462.

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A complex crack is one of severe crack that can occur at the dissimilar metal weld of nuclear piping. A relevant fracture mechanics assessment for a pipe with a complex crack has become interested in structural integrity of nuclear piping. A stress intensity factor is not only an important parameter in the linear elastic fracture mechanics to predict the stress state at the crack tip, but also one of variables to calculate the J-integral in the elastic plastic fracture mechanics. The accurate calculation of stress intensity factor is required for integrity assessment of nuclear piping system based on Leak-Before-Break concept. In the present paper, stress intensity factors of complex-cracked pipes were calculated by using detailed 3-dimensional finite element analysis. As loading conditions, global bending, axial tension and internal pressure were considered. Based on the present FE works, the values of shape factors for stress intensity factor of complex-cracked pipes are suggested according to a variables change of complex crack geometries and pipes size. Furthermore, the closed-form expressions based on correction factor are newly suggested as a function of geometric variables. These new solutions can be used to Leak-Before-Break evaluation for complex-cracked pipes in the step of elastic J calculation.
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Oh, Chang-Sik, Nak-Hyun Kim, Sung-Hwan Min, and Yun-Jae Kim. "Finite Element Damage Analyses for Predictions of Creep Crack Growth." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25294.

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This paper provides the virtual simulation method for creep crack growth test, based on finite element (FE) analyses with damage mechanics. Creep tests of smooth bars are used to quantify the constants of creep constitutive equation. The reduction of area resulting from creep tests of smooth and notched bar is adopted as a measure of creep ductility under multiaxial stress conditions. The creep ductility exhaustion concept is adopted for calculating creep damage, which is defined as the ratio of creep strain to the multiaxial creep ductility. To simulate crack propagation, fully damaged elements are forced to have nearly zero stresses using user-defined subroutine UHARD in the general-purpose FE code, ABAQUS. The results from 2D or 3D FE analyses are compared with experimental data of creep crack growth. It is shown that the predictions obtained from this new method are in good agreement with experimental data.
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Chen, Mingya, Weiwei Yu, Jinhua Shi, and Feng Lu. "Nonlinear Finite Element Analysis of Class 1 Pressure Vessels." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66910.

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The rules of design by analysis have been widely accepted for the Class 1 Nuclear Pressure Vessel, and two methods, stress classification method (based on the linear analysis) and the direct route (nonlinear analysis by Finite Element (FE) method), have been developed. In the stress classification method, the stress is classified in primary, secondary and peak stresses, and there are many shortcomings in this method. The stress classification is only easy in simple cases, like cylindrical shell under axisymmetric loads. In some cases the elastic analysis result can be non-conservative in particular when a part of primary stresses is considered secondary, like thermal expansion in some piping systems. When the geometry or the loads are more complex (such as, nozzles of reactor pressure vessels (RPV)), it will be an extremely conservative approach if a large part of stresses is considered as primary. Consequently, the direct route based on FE method is an efficient alternative to the linear analyses, and one of the major advantages is to suppress the discussion on the “stress classification in primary versus secondary” associated with the elastic analysis. This work reviews the existing linear design rules in the different codes, such as ASME Code NB 3200 and RCC-M Code B 3200, firstly. Then a typical case study of a large class 1 vessel nozzle, a RPV nozzle, under pressure and piping loads based on linear (stress classification method) and nonlinear rules (direct route) is presented. The case will consider 2D geometries under axisymetrical loads, and the failure models of plastic collapse, plastic instability and local failure are studied. Lastly, a set of proposals to improve the design rules are given.
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Venkataramana, K., V. Bhasin, K. K. Vaze, and H. S. Kushwaha. "B2' Stress Indices for Elbows Using Non-Linear Finite Element Analysis." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2689.

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Nuclear power plants are designed to withstand earthquake loads without severe damage under service level D conditions. Under earthquake induced reversing dynamic load, nuclear power plant components may undergo plastic deformation. Plastic deformation in class I nuclear power plant piping systems is limited by Equation (9) of ASME Boiler & Pressure Vessel Code [14], Section III, NB-3652. In the year 2000, the ASME B&PV Code was revised to accommodate reversing dynamic loading in which the failure mode is fatigue ratcheting, instead of plastic collapse. This modified equation [16] contains B2′ index, which is given as a fraction of B2 index where, B2 is defined for monotonic loading [17]. In this study a new definition is proposed for calculating B2′ stress index which is given by B2′ = MCLcyclicRange,straightpipe/MCLcyclicRange,component, where MClcyclicRange is the range of collapse moment. Incremental elastic-plastic nonlinear finite element analyses are performed considering both material and geometric nonlinearities. Kinematic hardening, isotropic hardening and elastic-perfectly plastic material models have been used to model the material behavior during plastic deformation. Load deflection curves are obtained and from these curves collapse loads for monotonic and cyclic loading are determined. B2 and B2′ stress indices are computed for elbows using the proposed equation. The computed stress indices are compared with ASME Code values.
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Chung, Chen-Yuan, Mostafa Motavalli, and Joseph M. Mansour. "Stress Relaxation of Cartilage Under Simple Shear and Compression: Experiments and Finite Element Analyses." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80145.

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Articular cartilage is a hydrated connective tissue consisting of a relatively small number of chondrocytes surrounded by a saturated extracellular matrix comprised mainly of type-II collagen fibrils and proteoglycans. As a deformable fluid saturated material, cartilage is most often modeled using biphasic or poroelastic theories [1,2]. The ultimate goal of this work is to evaluate biomechanical properties of native and tissue engineered cartilage under combined compression and shear. The purpose of this investigation was to determine stress and deformation fields in cartilage under compression and simple shear and relate these to measured results.
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Pacheco, Pedro M. Calas Lopes, Paulo Pedro Kenedi, Jorge Carlos Ferreira Jorge, Marcelo Amorim Savi, and Hugo Gama dos Santos. "Finite Element Residual Stress Analysis Applied to Offshore Studless Chain Links." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51508.

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The increasing expansion of deepwater petroleum activities has resulted in new challenges to the design of mooring systems. The complex mooring systems load history, which consists in a combination of wind, waves and currents, could induce nucleation and propagation of cracks in mooring line components. The failure of a single element in a mooring line of an offshore oil exploitation platform can produce incalculable environment damage as well as human and material losses. Offshore mooring line components like chain links must be submitted to a mandatory proof test, dictated by offshore standards, where loads higher than operational loads are applied to the mechanical component, resulting in high levels of residual stresses. Nevertheless, its presence is not considered in traditional design methodologies. Therefore, it is fundamental to develop new and more precise methodologies for assessing the structural integrity of mooring components. In this article, a comparative study is developed considering different approaches: two bidimensional finite element models, two tridimensional finite element models and an analytic model. These analyses establish the drawbacks and goals of using simpler models in the prediction of studless chain links stress distributions and in their fatigue lives. The four finite element models consider large displacements, plasticity and contact phenomena. Moreover, a simple fatigue life analysis is presented, based on SN curve, considering the effect of residual stresses in studless chain links before operation, that is, with loads caused by the proof test.
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Reports on the topic "Finite-element stress analyses"

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Patel, Reena. Complex network analysis for early detection of failure mechanisms in resilient bio-structures. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/41042.

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Bio-structures owe their remarkable mechanical properties to their hierarchical geometrical arrangement as well as heterogeneous material properties. This dissertation presents an integrated, interdisciplinary approach that employs computational mechanics combined with flow network analysis to gain fundamental insights into the failure mechanisms of high performance, light-weight, structured composites by examining the stress flow patterns formed in the nascent stages of loading for the rostrum of the paddlefish. The data required for the flow network analysis was generated from the finite element analysis of the rostrum. The flow network was weighted based on the parameter of interest, which is stress in the current study. The changing kinematics of the structural system was provided as input to the algorithm that computes the minimum-cut of the flow network. The proposed approach was verified using two classical problems three- and four-point bending of a simply-supported concrete beam. The current study also addresses the methodology used to prepare data in an appropriate format for a seamless transition from finite element binary database files to the abstract mathematical domain needed for the network flow analysis. A robust, platform-independent procedure was developed that efficiently handles the large datasets produced by the finite element simulations. Results from computational mechanics using Abaqus and complex network analysis are presented.
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Gong, C. Finite Element Analysis of Laser Residual Stress Analysis for 7050 Aircraft Aluminum. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/10102776.

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Wands, B. Finite element stress analysis of D0 test beam transporter mainframe assembly. Office of Scientific and Technical Information (OSTI), September 1987. http://dx.doi.org/10.2172/6081112.

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Salveson, M. W. Painter Street Overcrossing: Linear-elastic finite element dynamic analysis. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5123335.

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Duerr, Joachim. Finite element analysis of thermal stresses in semiconductor devices. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6099.

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Bender, J. M. A Simple Screw Thread Model for Use in Finite Element Stress Analysis. Fort Belvoir, VA: Defense Technical Information Center, July 1989. http://dx.doi.org/10.21236/ada210233.

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Kistler, B. L. Finite element analyses of tool stresses in metal cutting processes. Office of Scientific and Technical Information (OSTI), January 1997. http://dx.doi.org/10.2172/477614.

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Riveros, Guillermo, Felipe Acosta, Reena Patel, and Wayne Hodo. Computational mechanics of the paddlefish rostrum. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41860.

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Purpose – The rostrum of a paddlefish provides hydrodynamic stability during feeding process in addition to detect the food using receptors that are randomly distributed in the rostrum. The exterior tissue of the rostrum covers the cartilage that surrounds the bones forming interlocking star shaped bones. Design/methodology/approach – The aim of this work is to assess the mechanical behavior of four finite element models varying the type of formulation as follows: linear-reduced integration, linear-full integration, quadratic-reduced integration and quadratic-full integration. Also presented is the load transfer mechanisms of the bone structure of the rostrum. Findings – Conclusions are based on comparison among the four models. There is no significant difference between integration orders for similar type of elements. Quadratic-reduced integration formulation resulted in lower structural stiffness compared with linear formulation as seen by higher displacements and stresses than using linearly formulated elements. It is concluded that second-order elements with reduced integration and can model accurately stress concentrations and distributions without over stiffening their general response. Originality/value – The use of advanced computational mechanics techniques to analyze the complex geometry and components of the paddlefish rostrum provides a viable avenue to gain fundamental understanding of the proper finite element formulation needed to successfully obtain the system behavior and hot spot locations.
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Hollis, Michael S. Use of Finite-Element Stress Analysis in the Design of a Tank-Cannon-Launched Training Projectile. Fort Belvoir, VA: Defense Technical Information Center, September 1994. http://dx.doi.org/10.21236/ada284296.

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Rhymer, Donald W. Stress Intensity Solutions of Thermally Induced Cracks in Combustor Liner Hot Spots Using Finite Element Analysis (FEA). Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada450027.

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