软硬交替多层膜法向压入过程的有限元分析

采用大变形弹塑性有限单元法,对高速钢基体上的软硬交替多层膜在法向压痕作用下的力学行为,进行了模拟和分析.为了研究膜层数和膜厚的影响,对从单层到16层的不同膜层体系进行了计算.通过对诸如膜层的变形、最大应力随膜层数的变化、界面剪应力分布、表面张应力分布等的分析,得出了这些参数的分布及其对膜层体系的摩擦学性能的影响.这些结果可为多层膜的结构优化设计提供定量的依据.

Finite Element Analysis on Indentation of Alternate Hard and Soft Multilayers

For a quantitative and better understanding of the Stress and strain responses and their effects on interface debonding and crack initiation and propagation of alternative hard and soft multilayers under contact loading, to explore methodologies of optimum design of surface multilayers, large strain elasto-plastic finite element method was used to evaluate the mechanical behaviors of TiN/Ti/TiN/Ti multilayer films on high speed steel substrate under hard asperity indentation. Calculations were conducted on different film systems from single to 16 layers to investigate the effects of layer numbers and film thickness. Based on the analysis of film deformation, maximum bending stress, interfacial shear stress, and surface tensile stress, the development of these parameters via layer numbers and the applied load was better understood, which is expected to provide sound basis for optimum design of multilayer film structures.