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Artykuły w czasopismach na temat "Backstress"

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Servatan, M., S. M. Hashemi, and A. Varvani-Farahani. "Ratcheting Simulation of Additively Manufactured Aluminum 4043 Samples through Finite Element Analysis." Applied Sciences 13, no. 20 (2023): 11553. http://dx.doi.org/10.3390/app132011553.

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This study presents a finite element-based ratcheting assessment of additively manufactured aluminum 4043 samples undergoing asymmetric loading cycles. The Chaboche material model in ANSYS was utilized and the effects of mesh and element type were examined. Different element numbers were used in a thorough convergence study to obtain independent meshing structures. The coefficients of this model were defined through stress–strain hysteresis loops determined from the strain-controlled tests. The backstress evolution and the corresponding yield surface translation in the deviatoric stress space
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McDowell, D. L. "A Bounding Surface Theory for Cyclic Thermoplasticity." Journal of Engineering Materials and Technology 114, no. 3 (1992): 297–303. http://dx.doi.org/10.1115/1.2904176.

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A nonisothermal, rate and time independent generalization of nonlinear kinematic hardening theory for cyclic plasticity is introduced. The model includes decomposition of backstress and of isotropic hardening between the yield surface radius and the backstress amplitude. A purely temperature dependent component of yield surface radius is assumed in addition to an isotropic hardening component. Issues of thermoplastic material stability and temperature history independence are clearly distinguished and addressed via implications of temperature rate terms. Correlations are reported for OFHC copp
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Kassner, M. E., P. Geantil, L. E. Levine, and B. C. Larson. "Backstress, the Bauschinger Effect and Cyclic Deformation." Materials Science Forum 604-605 (October 2008): 39–51. http://dx.doi.org/10.4028/www.scientific.net/msf.604-605.39.

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Backstresses or long range internal stresses (LRIS) in the past have been suggested by many to exist in plastically deformed crystalline materials. Elevated stresses can be present in regions of elevated dislocation density or dislocation heterogeneities in the deformed microstructures. The heterogeneities include edge dislocation dipole bundles (veins) and the edge dipole walls of persistent slip bands (PSBs) in cyclically deformed materials and cell and subgrain walls in monotonically deformed materials. The existence of long range internal stress is especially important for the understandin
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Borstad, C. P., E. Rignot, J. Mouginot, and M. P. Schodlok. "Creep deformation and buttressing capacity of damaged ice shelves: theory and application to Larsen C ice shelf." Cryosphere Discussions 7, no. 4 (2013): 3567–610. http://dx.doi.org/10.5194/tcd-7-3567-2013.

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Abstract. Around the perimeter of Antarctica, much of the ice sheet discharges to the ocean through floating ice shelves. The buttressing provided by ice shelves is critical for modulating the flux of ice into the ocean, and the presently observed thinning of ice shelves is believed to be reducing their buttressing capacity and contributing to the acceleration and thinning of the grounded ice sheet. However, relatively little attention has been paid to the role that fractures play in the flow and stability of ice shelves and their capacity to buttress the flow of grounded ice. Here, we develop
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Benn, Douglas I., Adrian Luckman, Jan A. Åström, et al. "Rapid fragmentation of Thwaites Eastern Ice Shelf." Cryosphere 16, no. 6 (2022): 2545–64. http://dx.doi.org/10.5194/tc-16-2545-2022.

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Abstract. Ice shelves play a key role in the dynamics of marine ice sheets by buttressing grounded ice and limiting rates of ice flux to the oceans. In response to recent climatic and oceanic change, ice shelves fringing the West Antarctic Ice Sheet (WAIS) have begun to fragment and retreat, with major implications for ice-sheet stability. Here, we focus on the Thwaites Eastern Ice Shelf (TEIS), the remaining pinned floating extension of Thwaites Glacier. We show that TEIS has undergone a process of fragmentation in the last 5 years, including brittle failure along a major shear zone, formatio
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Wolff, M., M. Böhm, M. Dalgic, G. Löwisch, N. Lysenko, and J. Rath. "Parameter identification for a TRIP model with backstress." Computational Materials Science 37, no. 1-2 (2006): 37–41. http://dx.doi.org/10.1016/j.commatsci.2005.12.007.

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Voyiadjis, G. Z., and P. I. Kattan. "Phenomenological evolution equations for the backstress and spin tensors." Acta Mechanica 88, no. 1-2 (1991): 91–111. http://dx.doi.org/10.1007/bf01170595.

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Foga, Steve, Leigh A. Stearns, and C. J. van der Veen. "Application of Satellite Remote Sensing Techniques to Quantify Terminus and Ice Mélange Behavior at Helheim Glacier, East Greenland." Marine Technology Society Journal 48, no. 5 (2014): 81–91. http://dx.doi.org/10.4031/mtsj.48.5.3.

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AbstractIceberg calving is an efficient mechanism for ice mass loss, and rapidly calving glaciers are often considered to be inherently unstable. However, the physical controls on calving are not well understood. Recent studies hypothesize that the presence of a rigid ice mélange (composed of icebergs, bergy bits, and sea ice) can reduce iceberg calving by providing “backstress” to the terminus. To test this hypothesis we use remote sensing techniques to construct a time series model of calving rate and size and composition of the adjacent ice mélange. We describe a semi-automated routine for
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Wierzba, Bartek, Tsutomu Mashimo, and Marek Danielewski. "Competition between Chemical and Gravity Forces in Binary Alloys." High Temperature Materials and Processes 37, no. 3 (2018): 285–88. http://dx.doi.org/10.1515/htmp-2016-0194.

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AbstractWe present the first experimental results of the growth of Cu6Sn5 and Cu3Sn under an external force field – during the sedimentation process. The results are compared with the proposed model under the combined influence of the Kirkendall effect, backstress and sedimentation. It is shown that Cu3Sn consumes the preformed Cu6Sn5 phase during sedimentation under a strong gravitational field of 779,000 G at 200 °C.
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Brahme, Abhijit P., Kaan Inal, Raja K. Mishra, and S. Saimoto. "The backstress effect of evolving deformation boundaries in FCC polycrystals." International Journal of Plasticity 27, no. 8 (2011): 1252–66. http://dx.doi.org/10.1016/j.ijplas.2011.02.006.

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Rozprawy doktorskie na temat "Backstress"

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Lamar, Andrew. "Bounding surface plasticity theory with backstress decomposition and material memory." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/15857.

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Jimenez, Reyes Jose. "Experimental and numerical contribution to the study of transformation induced plasticity (TRIP)." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMIR20.

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Ce travail a été réalisé dans le but d'apporter une contribution à l'étude de la plasticité induite par transformation (TRIP) à travers des analyses expérimentales et numériques. Pour ce faire, du point de vue expérimental, un programme expérimental original sur l'acier 35NCD16 observant les comportements des transformations austénite → martensite est réalisé sous différentes conditions de chargement. Les résultats indiquent que : (i) le TRIP n'a pas d'effet mémoire significatif, (ii) le matériau peut présenter une récupération de l'écrouissage pendant la transformation martensite → austénite,
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Jones, Benjamin David. "Digital butterflies of the backstreets : participatory art and the digital divide." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3063.

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Through this practice-based research I interrogate the terms community art, activism, social and digital media, as well as community and place. It is an investigation into both theoretical and practical aspects of community art practice and its connection to national and local policies on community, arts and digital media. It considers the increasing role digital technology and social media have in communities and community organisations, in particular under the guise of austerity, and how community organisations (do not) use social media and digital technology to encourage participation. It c
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Wang, Yi-Ting, and 汪怡婷. "Edge of the situation ─ The “backstreet” notes." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/xewfe7.

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碩士<br>國立臺灣藝術大學<br>版畫藝術研究所<br>100<br>his creative discussion "Edge of the situation ─ The “backstreet” notes" content is based on my National Taiwan University of Arts in the "Backstreet" life experience and observation as a starting point, to create works of art and creative description. In the course of my growth, for living in the crude environments temporarily and moving to different places many times, they become a memory deep in my mind. After I came to Taipei for study, seeing “the backstreet” due to the influences of the land requisition by government, land recovery by school in late 20
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"Why do women opt for backstreet abortions?: a sociological study." Thesis, 2008. http://hdl.handle.net/10210/1322.

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M.A.<br>In 1996, the South African Government implemented the Choice on Termination (CTOP) Act to curb maternal mortality. This study emerged after an observation by experts in the field that there were a growing number of women who were admitted in antenatal care units with incomplete abortions, commonly known as miscarriage. These experts observed that some of these women, on closer observation, had signs of either scared wombs or had foreign objects in their uteri. This was understandable in provinces where there were fewer health facilities offering TOP serves. In Gauteng, however, it was
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Akinde, Elizabeth Nkugbo. "Knowledge of adolescents on abortion in Lagos University Teaching Hospital complex." Diss., 2009. http://hdl.handle.net/10500/3780.

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The study sought to assess the knowledge of adolescents regarding abortion in a selected area in Lagos Nigeria. The researcher used a non-experimental, exploratory, descriptive research design for the study. One hundred adolescents participated in the study. The study found that many adolescents will not admit to having had an abortion. Moreover, the respondents gave different meanings for abortion, had inadequate knowledge of abortion and sexual and reproductive health. Cultural taboos and religious beliefs have a great impact on adolescents’ sexual behaviour. Most adolescents would not acce
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Mkhize, Bonginkosi Alloys. "The Termination of Pregnancy Act of 1996 : a theological ethical evaluation of abortion on demand." Diss., 2000. http://hdl.handle.net/10500/17465.

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This dissertation deals with a theological-ethical evaluation of the Termination of Pregnancy Act of 1996 on the area of abortion on demand. It aims at empowering women and also solving the problem of backstreet abortion. Chapter one gives a brief introduction to the Termination of Pregnancy Act of 1996. Chapter two gives a historical background of abortion and the factors tbat eventually led to the Termination of Pregnancy Act of 1996. Chapter three focuses mainly on the teachings of the Roman Catholic Church on abortion. Issues relating to the value of human life are discussed in this
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Książki na temat "Backstress"

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Hilman. Olga: Backstreet. Gramedia Pustaka Utama, 1992.

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Csillag, Andre. Backstreet Boys. Delacort Press, 2000.

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Davis, Justine. Backstreet hero. Silhouette Books, 2008.

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Davis, Justine. Backstreet Hero. Silhouette, 2008.

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Bowling, Harry. Backstreet child. Headline, 1993.

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Marron, Maggie. The Backstreet Boys. MetroBooks, 2000.

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Marron, Maggie. The Backstreet Boys. Barnes & Noble Books, 2000.

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Marron, Maggie. The Backstreet Boys. MetroBooks, 2000.

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Marron, Maggie. The Backstreet Boys. Friedman/Fairfax, 1999.

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Hood, Robert. Backstreets. Louis Braille Audio, 2000.

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Części książek na temat "Backstress"

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Brahme, Abhijit, Raja K. Mishra, and Kaan Inal. "A New Crystal Plasticity Based Constitutive Model Incorporating Backstress for FCC Polycrystals." In ICAA13: 13th International Conference on Aluminum Alloys. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch127.

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Aktaa, Jarir, and Bernd Schinke. "A Model for Damage and Lifetime Prediction Taking into Account the Backstress." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_113.

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Brahme, Abhijit, Raja K. Mishra, and Kaan Inal. "A New Crystal Plasticity Based Constitutive Model Incorporating Backstress for FCC Polycrystals." In ICAA13 Pittsburgh. Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_127.

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Sargeant, Dane, Md Zahidul, Rishabh Sharma, Marko Kenezevic, David T. Fullwood, and Michael P. Miles. "Modeling of Springback Behavior in AA6016-T4 Sheet via an Elastoplastic Self-consistent Model Incorporating Backstress." In Light Metals 2022. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92529-1_37.

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Sargeant, Dane, Md Zahidul Sarkar, Rishabh Sharma, Marko Knezevic, David Fullwood, and Michael Miles. "Modeling the Effect of Backstress on Springback Predictions in AA 6016-T4 as a Function of Pre-strain." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-40920-2_70.

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Sieglohr, Ulrike. "From ‘Backstreet Marilyn’ to New Marlene: The Rise to International Fame as a Star Directed by Fassbinder, 1975–82." In Hanna Schygulla. British Film Institute, 2014. http://dx.doi.org/10.1007/978-1-84457-828-3_3.

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"The Backstreets." In The Backstreets. Columbia University Press, 2022. http://dx.doi.org/10.7312/turs20290-002.

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Sperber, Daniel. "Roads and Backstreets." In The City in Roman Palestine. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195098822.003.0011.

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Let us now look at the roads and side streets in the Roman Palestinian town. The literary evidence about the width of such streets is somewhat problematic. In the baraita in B. Baba Batra 99ab we read as follows: . . .A private path is four cubits wide, a path from one town to another is eight cubits, a public path 16 cubits, and a path to the cities of refuge 32 cubits wide. . . . Likewise, M. Baba Kama .5, in the name of Rabbi Eliezer (late first century C.E.), tells us that a standard public path is 16 cubits wide. If we assume the cubit equals approximately 70 cm, we arrive at the followin
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"Contents." In The Backstreets. Columbia University Press, 2022. http://dx.doi.org/10.7312/turs20290-toc.

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"Introduction." In The Backstreets. Columbia University Press, 2022. http://dx.doi.org/10.7312/turs20290-001.

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Streszczenia konferencji na temat "Backstress"

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Green, Richard, Jonathan Douglas, Andrew Moffat, and Brent Scaletta. "A Constitutive Model for Predicting Modified Creep Strain Rates due to Cyclic Loading of Gas Turbine Components." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91521.

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Abstract The traditional approach to the design of industrial Gas Turbines considers base load operation. This assumption is no longer applicable as owner operators require more operational flexibility and increased availability and reliability. Flexibility in operation manifests as increased cyclic loading and variations in on and off load dwell periods and thermal loads. These complex loading profiles inevitably lead to damage from both creep and fatigue, and interaction of these two damage mechanisms over the duration of the service interval. These interactions can result in higher average
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Moffat, Andrew, Richard Green, Calum Ferguson, and Brent Scaletta. "Development of a Constitutive Backstress Model for the Prediction of Creep and Stress Relaxation in Gas Turbine Materials." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16191.

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Abstract There is a drive towards a broader range of fuels in industrial gas turbines, with higher levels of sulphur and potentially hydrogen. Due to these harsher environments, there is also a drive for corrosion resistant alloys and coatings. A number of key corrosion resistant superalloys, which are being employed to cope with these evolving conditions, exhibit primary creep. It is therefore imperative that fundamental material models, such as those for creep deformation, are developed to ensure they can accurately predict the material response to evolving operating conditions. The requirem
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Lapczyk, Ireneusz, and Juan A. Hurtado. "A Viscoelastic-Elastoplastic Finite Strain Framework for Modeling Polymers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36831.

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In this paper we present a new constitutive framework, the Parallel Rheological Framework (PRF), for modeling polymers that has been recently developed by the authors and implemented in the commercial finite element software Abaqus [1]. The framework is based on parallel finite-strain viscoelastic and elastoplastic networks. For each viscoelastic network a multiplicative split of the deformation gradient into elastic and viscous components is assumed. The evolution of the viscous component of the deformation gradient is governed by a flow rule obtained assuming the existence of a creep potenti
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Islam, Nazrul, and Tasnim Hassan. "Uniaxial Fatigue, Creep and Ratcheting Response Simulations of Alloy 617 Using Damage Coupled Viscoplastic Model." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84756.

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A damage coupled unified constitutive model (UCM-CDM) is developed in this study to predict uniaxial fatigue, fatigue-creep, ratcheting and creep responses of Alloy 617. The experimental data used for validating the UCM-CDM included these responses for different strain rates and strain ranges for temperatures 760–1000°C. Rate dependent modeling features like Norton’s power law, static recovery, and isotropic damage evolution law are incorporated in an existing UCM for improving simulations of short-term stress relaxation and long-term creep responses. A backstress threshold modeling feature is
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Gilman, Tim, Bill Weitze, Jürgen Rudolph, Adrian Willuweit, and Arturs Kalnins. "Using Nonlinear Kinematic Hardening Material Models for Elastic-Plastic Ratcheting Analysis." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45674.

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Applicable design codes for power plant components and pressure vessels demand for a design check against progressive plastic deformation. In the simplest case, this demand is satisfied by compliance with shakedown rules in connection with elastic analyses. The possible non-compliance implicates the requirement of ratcheting analyses on elastic-plastic basis. In this case, criteria are specified on maximum allowable accumulated growth strain without clear guidance on what material models for cyclic plasticity are to be used. This is a considerable gap and a challenge for the practicing CAE (Co
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Dewees, David J. "Application of Elastic-Plastic Design Data in the New ASME B&PV Code Section VIII Division 2." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25641.

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The updating and re-writing of the ASME Boiler and Pressure Vessel Code, Section VIII Division 2 (2007) [1] has introduced several new and unique features. One of these features is the inclusion of specific materials data for use in elastic-plastic analysis of pressure vessel components. Both monotonic and cyclic stress strain curve models are provided, with supporting constants for a range of materials and temperatures. The elastic-perfectly plastic material model has been used in commercial Finite Element (FE) codes for many years to perform limit load and ratcheting analyses. The new materi
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