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本文用对滚式接触疲劳试验机,测试了四种不同渗碳层深度试件的表面剥落过程,提出了剥落的形成模型,通过对剥落断口的宏观及微观分析,详细阐述了剥落的形成机理。关于剥落裂纹生核的控制应力,本文首次将最大剪应力τ_(max)等效转换为对称循环变应力τ_d,通过τ_d与平行或垂直于表面的平面内剪应力τ_(yz)在接触应力场中变化的对比分析,对不同层深的剥落提出了相应的计算准则。
In this paper, the surface peel process of four different carburized layer depth specimens was tested with a roll-contact fatigue tester, and the formation model of the peel was proposed. The formation mechanism of peel was elaborated by the macroscopic and microscopic analysis of the peel fracture. . In this paper, for the first time, the maximum shear stress τ_max is equivalently transformed into the symmetric cyclic stress τ_d. The relationship between τ_d and the in-plane shear stress τ_ (yz), parallel or perpendicular to the surface, Comparative analysis of changes in the different levels of peeling off the calculation of the corresponding guidelines.