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首页> 外文期刊>Nature reviews Cancer >Fatigue Life Prediction of Rivet Joints
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Fatigue Life Prediction of Rivet Joints

机译：铆钉关节的疲劳寿命预测

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Strength reduction in structures like aircraft could be resulted in cyclic loads over a period of time and is an important factor for structural life prediction. Service loads are emphasized at the regions of stress concentration, mostly at the connection of components. The initial flaw prompting the service life was expected by using the equivalent initial flaw size (EIFS) which has been recognized as a powerful design tool for life prediction of engineering structures. This method was introduced 30 years ago in an attempt to study the initial quality of structural details. In this paper, the prediction of life based on fracture mechanics in riveted joints has been addressed through the concept of EIFS. For estimation of initial crack length by EIFS, an extrapolation method has been used. The EIFS value is estimated using the coefficient of cyclic intensity (Delta K) and using the cyclic integral (Delta J), and the results are compared with each other. The simulation results show that if the coefficient of tension has been used in the EIFS estimation, which is based on the Paris law, the EIFS value will be dependent on the loading domain, while the use of the J-cyclic integral in the EIFS decreases its dependence on the load domain dramatically.
机译：像飞机这样的结构的强度降低可能导致一段时间内的循环负载，并且是结构寿命预测的重要因素。在应力集中区域强调服务载荷，主要是在组件的连接处。利用相当于初始缺陷（EIFS）预期的初始缺陷预期，该初始缺陷（EIF）被认为是工程结构的生命预测的强大设计工具。该方法是在30年前推出的，试图研究结构细节的初始质量。本文通过eIFS的概念解决了基于铆接关节骨折力学的寿命预测。为了通过EIFS估计初始裂缝长度，已经使用了外推方法。使用循环强度（Delta K）的系数和使用循环积分（Delta J）来估计EIFS值，并且结果彼此比较。仿真结果表明，如果在基于巴黎法律的EIFS估计中使用了张力系数，则EIFS值将取决于加载域，而EIF中的J-CISSIC积分的使用降低它急剧地对负载域的依赖性。

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