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论文作者:英语论文网论文属性:作业 Assignment登出时间:2013-08-20编辑:zbzbz点击率:3145
论文字数:967论文编号:org201308190811296165语种:英语 English地区:中国价格:免费论文
摘要:本文关注的是在应力应变行为的–循环硬化模型的评价铝合金ac4c-t6可用于LNG货物泵在低温操作。对确保LNG货物泵的强度评估,循环硬化和塑性材料模型铝合金ac4c-t6研究通过FEA(有限元分析)与不同硬化选项包括线性和非线性硬化,运动硬化和各向同性和组合,硬化模型。
2. Constitutive equations for material model
Under cyclic loads, materials can also show cyclic hardening. These features are usually modeled by adding a hardening component to the evolution of the yield surface ( Chaboche, 1986). There are various models that can be used for cyclic loading and monotonic tensile test. Material behavior during cyclic load can be found in several studies ( Rahman, Hassana, & Corona, 2008; Kang, 2005). Rate-independent plasticity is characterized by the irre-
versible straining that occurs in a material once a certain level of stress is reached. The plastic strains are assumed to develop instantaneously, that is, independent of time. Five types of material behaviors are reviewed for the proper description (ANSYS, 2006; Lemaitre & Chaboche, 1990). Practically, these models can be applied to studies of low-cycle fatigue and strength assessment.
References
[1] ANSYS. (2006).Theory reference – structures with material nonlinearities . ANSYS Inc. Ltd.
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[5] Chung, K., Lee, M. G., Kim, D., Kim, C., Wenner, M. L., & Barlat, F. (2005). https://www.51lunwen.org/englishpaper/ Spring-back evaluation of automotive sheets based on isotropic–kinematic hardening laws and non-quadratic anisotropic yield functions: part I: theory and formulation. International Journal of Plasticity, 21(5), 861–882.
[6] Det Norske Veritas. (2006). Sloshing analysis of LNG membrane tanks . Det Norske Veritas.
[7] Ishihara, S., & McEvily, A. J. (2002). Analysis of short fatigue crack growth in cast aluminium alloys. International Journal of Fatigue, 24 , 1169–1174.
[8] Kang, G. (2005). Finite element implementation of visco-plastic constitutive model with strain-range-dependent cyclic hardening. Communications in Numerical Methods in Engineering, 22(2), 137–153.