Numerical simulations of cyclic behaviors in light alloys under isothermal and thermo-mechanical fatigue loadings |
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| Affiliation: | 1. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Fatigue and Wear in Materials (FWM) Workgroup, Irankhodro Powertrain Company (IPCO), Tehran, Iran;1. Institute of Materials Science and Engineering (WKK), TU Kaiserslautern, P.O. Box 3049, 67653 Kaiserslautern, Germany;2. Center for Structural Materials, State Materials Testing Institute Darmstadt (MPA), Chair and Institute for Materials Technology (IfW), Technische Universität Darmstadt, 64283 Darmstadt, Germany;1. School of Materials Science and Engineering, Shenyang University of Technology, 111 Shenliao Road, 110870 Shenyang, PR China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China;3. School of Materials and Chemical Engineering, Xi''an Technological University, 2 Xuefuzhong Road, 710021 Xi''an, PR China |
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| Abstract: | 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’s hardening model and the Nagode’s 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. |
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| Keywords: | Numerical simulation Cyclic behavior Light alloys Isothermal fatigue Thermo-mechanical fatigue |
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