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首页> 美国卫生研究院文献>Materials >On the Influence of Capillary-Based Structural Health Monitoring on Fatigue Crack Initiation and Propagation in Straight Lugs
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On the Influence of Capillary-Based Structural Health Monitoring on Fatigue Crack Initiation and Propagation in Straight Lugs

机译：基于毛细管的结构健康监测对直耳疲劳裂纹萌生和扩展的影响

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This paper addresses the influence on the fatigue life induced by the implementation of a capillary-based structural health monitoring methodology, patented under the name eSHM. It consists in integrating structurally small and pressurized capillaries into the component, so that when a fatigue crack breaches the capillary network, it results in a leak flow to the open atmosphere and loss of pressure in the galleries which is detected by a pressure sensor. The novelty of the proposed system resides in the opportunity to locate the capillary according to the designer’s need, as one resorts to additive manufacturing for the part production. However, the presence of these galleries in highly stressed regions raises concerns about crack initiation at the capillary itself and accelerated fatigue crack growth. This paper aims at the quantification of the influence the eSHM has on the fatigue behavior of the component and the determination whether this influence is significant or not. To that purpose, numerical simulations on a straight lug component, using the finite elements and eXtended Finite Elements Methods (XFEM), are performed. Various capillary sizes and shapes are assessed, so as to enable a general conclusion on the impact of the eSHM methodology in straight lugs.
机译：本文探讨了实施基于毛细管的结构健康监测方法对疲劳寿命的影响，该方法以eSHM为专利名。它包括将结构紧凑且加压的毛细管整合到组件中，以便当疲劳裂纹破坏毛细管网络时，会导致泄漏到开放大气中，并导致通道中的压力损失，这可以通过压力传感器检测到。提议的系统的新颖之处在于有机会根据设计者的需求来定位毛细管，因为人们可以通过增材制造来生产零件。但是，这些画廊在高应力区域中的存在引起了人们对毛细管本身处的裂纹萌生和疲劳裂纹加速生长的担忧。本文旨在量化eSHM对组件疲劳性能的影响，并确定这种影响是否显着。为此，使用有限元和扩展有限元方法（XFEM）对直凸耳部件进行了数值模拟。评估了各种毛细管尺寸和形状，以便能够得出关于eSHM方法在直柄中的影响的一般结论。

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