自润滑烧结体材料介观表层应力数值分析

Numerical Analysis of Mesoscopic Surface Layer Stress for Self-lubricating Sintered Material

针对自润滑烧结材料的特殊结构,建立了介观尺度的表层应力有限元分析模型,通过计算得出可用于表征的自润滑材料力学性能基本单元的基体与润滑膜厚比为10。研究了材料孔隙度以及润滑膜厚的变化对应力的影响,结果表明,当润滑膜的弹性模量与基体的弹性模量相比较小时,润滑膜的承载能力较低,在整个膜厚上受力基本相同;材料的强度主要由基体决定,并且基体的承载能力受孔隙度的影响;基体材料中孔隙边缘附近的结构及其受力与变形,对自润滑材料的固体润滑剂补偿和输送有较大的影响。

A finite element analysis model of mesoscopic surface layer stress was modeled for the special structure of self-lubricating sintered material.The results show that when the ratio of matrix depth and lubricating film thickness is 10 in the model,the base unit of self-lubricating sintered material could be used for characterizing the base mechanical properties.The effects of change in porosity and lubricating film thickness on surface layer stress of the base unit were studied.As the elastic modulus of lubri...