利用LS-DYNA的微尺度球面-平面接触模型力学行为有限元分析  

Finite element analysis for mechanical behavior of sphere-plane contact model on micro-scale based on LS-DYNA

作　　者：康宏文[1] 杨晓京[1] 

机构地区：[1]昆明理工大学现代农业工程学院,昆明650500

出　　处：《现代制造工程》2013年第2期14-19,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金资助项目(11062003);云南省应用基础研究计划资助项目(2009ZC042M)

摘　　要：球面-平面接触模型是研究接触问题的基础。首先,分析了LS-DYNA有限元接触算法的基础理论,然后利用LS-DYNA有限元分析软件,分析了微尺度球面-平面接触模型的力学行为。研究表明,微尺度球面与平面以不同接触深度接触时,接触应力场以球面顶部位置为中心,呈圆形分布在接触位置区域,并且随着接触深度增加,合应力明显增大。接触过程中首先在基体表层产生弹性变形,然后进入塑性变形,并随接触深度增加,塑性变形区进一步扩大。比较接触区域不同位置的接触应力,在接触区域底部、中下部接触应力最大,而在上部、中上部的接触应力要小。随着接触深度的加深,局部发生以塑性变形为主的变形,材料失效,接触区域各位置的接触应力反而变小,且大致相同。Sphere-plane contact model is research foundation of contact problem. First of all, the basic theory of LS-DYNA finite element contact algorithm was analyzed. And then using LS-DYNA finite element analysis software, mechanical behavior of the sphere-plane contact model on micro-scale was analyzed. The result shows that stress distribution is circular shape and center of stress area is located on top of sphere surface. When sphere contacts on plane with different depth, stress distribution in the con- tact area is also different, and along with the contact depth increasing, the stress is also increase. During contact process the de- formation in the matrix surface is elastic deformation at initial stage, and then becomes the plastic deformation. With the contact depth increasing, plastic deformation area expand. Comparing the stress of different positions, the bottom in the contact area has the biggest stress, and the upper has smaller stress. But when the contact depth is much too deeper, the stress of contact area be- come smaller due to the deformation of the local matrix is plastic deformation, and then material failure caused by the plastic de- formation.

关 键 词：微机电系统 微接触 有限元分析 接触力学 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]