Numerical simulations of cyclic behaviors in light alloys under isothermal and thermo-mechanical fatigue loadings

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• 作者：G.H. Farrahi ; A. Shamloo ; M. Felfeli ; M. Azadi
• 关键词：Numerical simulation ; Cyclic behavior ; Light alloys ; Isothermal fatigue ; Thermo-mechanical fatigue
• 刊名：Materials and Design
• 出版年：April, 2014
• 年：2014
• 卷：56
• 期：Complete
• 页码：245-253
• 全文大小：1967 K

文摘

In this article, numerical simulations of cyclic behaviors in light alloys are conducted under isothermal and thermo-mechanical fatigue loadings. For this purpose, an aluminum alloy (A356) which is widely used in cylinder heads and a magnesium alloy (AZ91) which can be applicable in cylinder heads are considered to study their stress-strain hysteresis loops. Two plasticity approaches including the Chaboche鈥檚 hardening model and the Nagode鈥檚 spring-slider model are applied to simulate cyclic behaviors. To validate obtained results, strain-controlled fatigue tests are performed under low cycle and thermo-mechanical fatigue loadings. Numerical results demonstrate a good agreement with experimental data at the mid-life cycle of fatigue tests in light alloys. Calibrated material constants based on low cycle fatigue tests at various temperatures are applied to models to estimate the thermo-mechanical behavior of light alloys. The reason is to reduce costs and the testing time by performing isothermal fatigue experiments at higher strain rates.