Abstract:

A new thick wall of single-cell contact theoretical model was developed with the stress concentration method of isolated hole
in “infinite board”and the characteristic parameters of λ, and the high-temperature sweating and self-lubricating materials were taken as an example to simulate and analyze the intracellular stress distribution of single cell
body within the scope of λ≤0.4 based on the model. The results show that: As the load increasing, the contact radius increases gradually and all of the stress in the contact region become bigger gradually; the maximum of shear stress gradually migrates from the cell surface to the internal cell, while the greatest of y-stress transfers from the contact center to the θ=0 and θ=-π,r=r₂ of the pore; and the maximum of x-stress transfers from the contact center to the θ=-π/2,r=r₂ of the pore;the stress concentration area gradually replaces the contact surface to be the source inducing micro-cracks. The parameters of
λ also has a great influence on the contact stress distribution:
when λ=0.4,the y-stress margin of the pore stress concentration region and the contact region is the largest;while λ=01,the x-stress margin of these two places is the largest; when loads is greater than 1000N and λ=02,the maximum of shear stress is the minimum.

Key words: high-temperature sweating and self-lubrication material, single-cell contact；pore；stress analysis

摘要：

采用“无限大板”中孤立小孔应力集中方法，建立了一种新的以特征参数λ表征的厚壁单胞体接触应力理论模型;以高温发汗润滑体为对象，采用该模型仿真分析了单胞体在特征参数λ≤0.4情况下的胞内应力分布状态。结果表明：随着外载荷的增大，接触半径逐渐增大，且接触区域的各向应力（绝对值）均逐渐变大；最大剪应力逐渐从胞体表面向胞体内部迁移，其y向最大应力从接触中心逐渐向孔边θ=0和θ=-π,r=r₂处转移,x向最大应力从接触中心逐渐向孔边θ=-π/2,r=r₂处转移；该应力集中区逐渐取代胞体接触表面而成为微裂纹诱发源。λ对胞体接触应力分布也有很大影响：当λ=0.4时，孔穴应力集中区与胞体接触区的y向应力差值最大；当λ=0.1时，两处的x向应力差值最大；当外载荷大于1000N时，λ=0.2的胞体内的最大剪应力具有最小值。

关键词: 高温发汗润滑体, 单胞接触, 孔穴, 应力分析, 