考虑应变硬化的混合弹塑性接触模型  

A Mixed Elastic-Plastic Contact Model Considering Strain Hardening

作　　者：王庆朋[1] 张力[1] 尚会超[1] 唐志刚[1] 

机构地区：[1]重庆大学汽车工程学院,重庆400044

出　　处：《西安交通大学学报》2016年第2期132-137,共6页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51175530)

摘　　要：为了更加真实地反映粗糙表面的实际接触情况,根据表面微凸体变化的连续性、单调性和光滑性原理提出了一种新的混合弹塑性接触模型。该模型在球体初始接触时,就考虑更小微凸体的塑性变形和较大变形量时的应变硬化。通过反正切函数构建一组函数,用来表征接触过程中变形状态的变化,利用Meyer硬度指数反映应变硬化的影响,进而导出接触面积和接触载荷的数学表达式。通过采用文献中已有的铜、铝合金和纯镍材料的实验测试结果,以及文献中不同的弹塑性接触模型的计算结果进行对比分析,结果表明,该模型的计算结果能够很好地与实验测试结果吻合,尤其是在大变形量、出现应变硬化的情况下,更能体现出该模型的优势。A new mixed elastic-plastic model for the real contact is developed to consider both plastic response of smaller asperity and strain hardening effects.It is assumed that the contact behavior is continuous,monotonic and smoothing.An arc-tangent function is used to express different contact status,and the Meyer hardness exponent is used to reflect the effect of strain hardening.Then a math model for both the contact area and the contact load is derived.The proposed model is tested using experimental results for copper,aluminum alloy and nickel reported in the literature,and compared with other contact models in the literature.The proposed model shows a good agreement with experimental results and a big advantage especially when strain hardening occurs.

关 键 词：微凸体 混合弹塑性 接触模型 应变硬化 

分 类 号：O343.3[理学—固体力学]