微动接触应力的有限元分析

以方足微动桥，试样接触几何条件为研究对象，应用ANSYS有限元分析软件对其接触面上的应力分布进行弹性有限元分析，验证用ANSYS所建计算模型的正确性，分别计算不同名义接触压力和不同摩擦因数条件下接触状态（粘着区、滑动区、张开区）和接触面应力分布，选取不同水平的循环载荷进行计算，研究接触状态和应力分布随循环载荷的变化情况。结果表明，微动疲劳过程中接触表面拉应力与剪应力在接触面的粘，滑交界区存在突变，微动疲劳裂纹正是在这一区域内萌生并扩展，计算结果与实验结果吻合很好。

FINITE ELEMENT ANALYSIS FOR FRETTING CONTACTING STRESSES

A fretting fatigue contact geometry of a specimen contacting a rectangular fretting pad was studied.Distribution of elastic stresses on the contact surface of the specimen and the rectangular pad was analyzed in detail using a finite element solver ANSYS.The correction of the finite element model was verified.The contacting status(sticking, sliding and opening) and contact stresses on the contact surface were calculated to investigate the effect of the nominal contact pressure and frictional coefficient on the distribution of the contact stress.The influence of the load on the distribution of the three zones and stress on contact surface was also analyzed at different load level.The results show that there exist mixed sticking/sliding zone on which the tensile stress and shear stress change fiercely in process of fretting.The fatigue cracks will nucleate at the zone and then propagate. The some calculated results are in agreement with the observation by experiment.