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首页> 外文期刊>Journal of engineering materials and technology >Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers
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Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers

机译：聚合物滑动磨损过程中疲劳裂纹扩展的建模

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摘要

The propagation of a crack initiating at the surface was analyzed to simulate the fatigue wear behavior of glassy polymer materials. A crack in a material half plane was assumed to propagate along a predefined path as a result of contact loading by a cylinder sliding on the polymer surface. The crack path consisted of a vertical straight-line segment and a declined straight line originating at a branch point on the vertical crack segment. The stress intensity factors K_Ⅰ and K_Ⅱ along the crack path were computed by using finite element methods, and their values utilized in the Paris law to determine crack propagation rates. Because this process simulates surface pitting, component fatigue life is assumed to be proportional to the time needed for the propagating declined crack to intersect a neighboring vertical crack, a condition known to lead to pitting. This fatigue life is estimated by integrating the Paris law. Numerical results show that the branch point where the declined crack path originates can effectively hinder crack propagation, and that the rate limiting step in fatigue is crack propagation along a small segment of the declined crack near the branch point. Some important factors that affect the reliability of numerically predicted fatigue life cycles are discussed. Experimental crack propagation paths and lifetimes are shown.
机译：分析了裂纹在表面的扩展，以模拟玻璃态聚合物材料的疲劳磨损行为。由于在聚合物表面上滑动的圆柱体的接触载荷，材料半平面中的裂纹被假定为沿着预定路径传播。裂纹路径由垂直直线段和从垂直裂纹段上的分支点开始的下降直线组成。沿裂纹路径的应力强度因子K_Ⅰ和K_Ⅱ采用有限元方法计算，其值在巴黎定律中用于确定裂纹扩展速率。因为此过程模拟了表面点蚀，所以假定部件的疲劳寿命与传播的下降裂纹与相邻的垂直裂纹相交所需的时间成比例，已知的条件是导致点蚀。通过综合巴黎法则可以估算出这种疲劳寿命。数值结果表明，下降裂纹路径的分支点可以有效地阻碍裂纹扩展，疲劳的限速步骤是沿着分支点附近的下降裂纹的一小段裂纹扩展。讨论了一些影响数值预测疲劳寿命周期可靠性的重要因素。显示了实验裂纹扩展路径和寿命。

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