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Three-dimensional finite element analysis of threaded fastener loosening due to dynamic shear load

机译：动剪力引起的螺纹紧固件松动的三维有限元分析

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摘要

The two most widespread causes of failure of threaded fasteners subjected to dynamic loads are fatigue and vibration induced loosening. This paper presents results of a study on failure of threaded fasteners by vibration induced loosening caused due to dynamic shear loads. Previous experimental work has revealed that fastener loosening occurs as a result of complete or localized slip at the thread and head contact surfaces. A three-dimensional finite element (FE) model is used to study details of four different loosening processes that are characterized by either complete or localized slip at the head and thread contacts. The FE model is found to be capable of adequately modeling factors that influence slip and predicting the different loosening processes. Primary factors that influence slip at fastener contacts are discussed. The results show that loosening can occur at relatively low shear loads due to the process of localized slip.
机译：承受动态载荷的螺纹紧固件失效的两个最广泛的原因是疲劳和振动引起的松动。本文介绍了由于动态剪切载荷引起的振动引起的松动导致螺纹紧固件失效的研究结果。先前的实验工作表明，紧固件松动是由于螺纹和头部接触表面完全或局部滑动造成的。三维有限元（FE）模型用于研究四种不同的松弛过程的细节，这些过程的特征是头部和螺纹接触处的完全或局部滑动。发现有限元模型能够对影响滑移的因素进行充分建模，并预测不同的松弛过程。讨论了影响紧固件接触处打滑的主要因素。结果表明，由于局部滑动的过程，在相对较低的剪切载荷下会发生松动。

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