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首页> 外文期刊>Tribology International >The effect of a critical micro-void defect on fretting fatigue crack initiation in heterogeneous material using a multiscale approach
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The effect of a critical micro-void defect on fretting fatigue crack initiation in heterogeneous material using a multiscale approach

机译：临界微空隙缺损对使用多尺度方法的异质材料中疲劳裂纹起始的影响

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Fretting fatigue problems are common in the aerospace and automotive industries, which can seriously affect the fatigue response of the material and the stability of the overall structure. In this paper, the effect of the size, location of single critical micro-void on the fretting fatigue initiation life of heterogeneous materials is studied by numerical simulations and modified critical plane criterion. The theory of critical distance (TCD) is used to consider stress gradients near the crack initiation points. It is shown that when the critical micro-void is located at different positions inside the sample, there is a weakened area similar to the half butterfly wings. This means that when the micro-voids are located in this area, the crack initiation life will be less than that in the case of homogenous material. Furthermore, there are also two enhancement zones. When the micro-voids are located in these two zones, the fretting fatigue life can be increased, that is, at a certain depth below the contact edge and at a certain distance to the right of the contact edge.
机译：气囊和汽车行业常见的疲劳问题常见，这可能严重影响材料的疲劳反应以及整体结构的稳定性。本文通过数值模拟研究了单个关键微空虚的尺寸，单个关键微空隙的位置的效果，以及改进的临界平面标准。临界距离（TCD）的理论用于考虑裂缝启动点附近的应力梯度。结果表明，当关键微空隙位于样品内部的不同位置时，存在与半蝶翼类似的弱化区域。这意味着当微空隙位于该区域中时，裂纹启动寿命将小于均匀材料的情况下。此外，还有两个增强区。当微空隙位于这两个区域中时，可以增加微空疲劳寿命，即在接触边缘下方的某个深度处和在接触边缘右侧的一定距离处。

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