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Initiation and growth of standing contact fatigue cracks

机译：静触疲劳裂纹的产生和发展

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摘要

In the standing contact fatigue test an indenter subjects a case hardened test specimen to a stationary but pulsating contact load. Two crack types appearing in the test specimen are investigated. The ring/cone cracks are surface cracks that circumvent the contact area, whereas the lateral cracks are horizontal sub-surface cracks. The initial crack lengths are determined for both crack types. Actual crack paths from experiments are evaluated numerically. For each crack tip position, stress intensity factors are determined from J{sub}1 and J{sub}2 integrals. The stress intensity ranges are compared to criteria for fatigue crack propagation rate and direction. As the cracks propagate, they orient in the direction with mode II loading close to zero.
机译：在直立接触疲劳测试中，压头使经过表面硬化处理的试样承受固定但脉动的接触载荷。研究了试样中出现的两种裂纹类型。环形/圆锥形裂纹是绕接触区域的表面裂纹，而横向裂纹是水平的次表面裂纹。确定两种裂纹类型的初始裂纹长度。实验得出的实际裂纹路径将通过数值评估。对于每个裂纹尖端位置，根据J {sub} 1和J {sub} 2积分确定应力强度因子。将应力强度范围与疲劳裂纹扩展速率和方向的标准进行比较。随着裂纹的扩展，它们在II型载荷接近于零的方向上取向。

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