Simulation of the Viscoplastic Material Behaviour of Cast Aluminium Alloys due to Thermal-Mechanical Loading

作     者：Franz Wilhelm Josef Spachtholz Martin Wagner Christian Kliemt Joachim Hammer 

作者机构：Fakultat Maschinenbau Ostbayerische Technische Hochschule Regensburg Regensburg 93053 Germany IABG mbH Ottobrunn 85521 Germany 

出 版 物：《材料科学与工程（中英文A版）》 (Journal of Materials Science and Engineering A)

年 卷 期：2014年第4卷第1期

页      面：56-64页

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：粘塑性材料 铸造铝合金 变形行为 Levenberg-Marquardt算法 机械 负载模拟 时间依赖性 应变速率 

摘      要：The thermal-mechanical deformation behaviour of the cast Aluminium alloy AlSi7Mg0.5 is calculatedon the basis of a viscoplastic material model by Chaboche. In detail elastic deformation, nonlinear isotropic and kinematic hardening and time-dependent material behaviour are incorporated. All relevant material parameters (i. e., influences as strain rates, strain amplitudes and viscoplastic relaxation behaviour) for this complex superposition of simultaneously varying mechanical and thermal loadings are identified by isothermal complex low cycle fatigue (CLCF) experiments at specific temperatures. The temperature dependence of the measured parameter datais obtained by computational optimization using a deterministic optimization technique (Levenberg-Marquardt algorithm). As a result, the isothermal and thermal-mechanical fatiguebehaviour under various operating conditions can be predicted in terms of the generated stresses. The accuracy of the modelling is verified by corresponding experimental TMF testing.