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Application of an interface failure model to predict fatigue crack growth in an implanted metallic femoral stem.

机译:界面失效模型在预测植入的金属股骨柄中疲劳裂纹扩展中的应用。

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摘要

A novel computational modelling technique has been developed for the prediction of crack growth in load bearing orthopaedic alloys subjected to fatigue loading. Elastic-plastic fracture mechanics has been used to define a three-dimensional fracture model, which explicitly models the opening, sliding and tearing process. This model consists of 3D nonlinear spring elements implemented in conjunction with a brittle material failure function, which is defined by the fracture energy for each nonlinear spring element. Thus, the fracture energy criterion is implicit in the brittle material failure function to search for crack initiation and crack development automatically. A degradation function is employed to reduce interfacial fracture properties corresponding to the number of cycles; thus fatigue lifetime can be predicted. Unlike other failure modelling methods, this model predicts the failure load, crack path and residual stiffness directly without assuming any pre-flaw condition. As an example, fatigue of a cobalt based alloy (CoCrMo) femoral stem is simulated. Experimental fatigue data was obtained from four point bending tests. The finite element model simulated a fully embedded implant with a constant point load. Comparison between the model and mechanical test results showed good agreement in fatigue crack growth rate.
机译:已经开发了一种新颖的计算建模技术来预测承受疲劳载荷的骨科合金的裂纹扩展。弹塑性断裂力学已被用于定义三维断裂模型,该模型明确地模拟了打开,滑动和撕裂过程。该模型由与脆性材料破坏函数结合实现的3D非线性弹簧元件组成,该函数由每个非线性弹簧元件的断裂能定义。因此,脆性材料破坏函数中隐含了断裂能准则,以自动搜索裂纹萌生和裂纹发展。使用降解函数来减少与循环次数相对应的界面断裂性能;因此可以预测疲劳寿命。与其他故障建模方法不同,该模型可以在不假设任何预缺陷条件的情况下直接预测故障载荷,裂纹路径和残余刚度。例如,模拟了钴基合金(CoCrMo)股骨柄的疲劳。从四点弯曲试验获得实验疲劳数据。有限元模型模拟了具有恒定点载荷的完全嵌入式植入物。模型与力学测试结果的比较表明,疲劳裂纹扩展速率吻合良好。

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