随动强化模型在多轴非比例加载下本构模型研究中的应用  

The Application of Kinematic Hardening Model in the Study of Constitutive Model on the Condition of Non-proportional Multiaxial Fatigue Load

作　　者：薛鹏[1] 吴昊[1] 李文晓[1] 林国斌[2] 任敬[2] 胡杰[2] 高定刚[2] 

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]同济大学磁浮交通工程技术研究中心,上海200092

出　　处：《机电一体化》2016年第8期48-51,共4页Mechatronics

基　　金：高等学校博士学科点专项科研基金(课题编号:20130072120058);国家科技支撑计划(课题编号:2013BAG19B01)

摘　　要：多轴非比例疲劳荷载状态下的构件寿命预测问题非常复杂,其中一个重要的工作是对于本构关系的预测。在材料弹性状态下这个问题相对简单,但当材料进入塑性以后,材料的屈服面及非比例效应都会随着塑性应变的增加发生相应改变,因此这个过程中等向强化、随动强化及非比例强化效应都必须被考虑。介绍了一种广义的多轴非比例疲劳荷载状态下计算材料本构关系的方法,该方法引入非线性多屈服面模型,通过塑性应变增量反映强化效应对材料广义硬化模量的影响,最终预测材料的应力应变关系。316L不锈钢多轴非比例疲劳实验验证了其方法的有效性。Fatigue life prediction of components is very tional fatigue loading , and one of the key points in the field material. The problem is relatively simple in the elastic field, complex when the material is under multiaxial non-propor- is about the prediction of the constitutive relationship of but material yield surface and the non-proportional hard- ening effect will be changed with the increase of plastic strain. So, isotropic hardening, kinematic hardening and non- proportional hardening effects must be considered in this process. This paper presents a general method to predict the constitutive relationship under muhiaxial non-proportional fatigue loading by introducing multi-nonlinear yield surface and the generalized hardening modulus is used to reflect the combined hardening effects along with the plastic strain in- crement. Non-proportional multiaxial fatigue experiments of 316L stainless steel validated the proposed method.

关 键 词：多轴疲劳 随动强化 非比例效应 多轴本构 

分 类 号：TG111.8[金属学及工艺—物理冶金]