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首页> 外文期刊>Journal of Mechanical Science and Technology >Loosening mechanism of threaded fastener for complex structures
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Loosening mechanism of threaded fastener for complex structures

机译：复合结构螺纹紧固件的松动机理

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摘要

Threaded fasteners are widely used in mechanical structures primarily owing to their easy disassembly for maintenance and low cost. However, the loosening mechanism of threaded fasteners due to dynamic loading has remained unclear for the past six decades. Current researches on complex structures comprising three or more components are insufficient. The two most common failure modes of threaded fasteners subjected to dynamic loading are fatigue and vibration-induced loosening. This study focuses on the failure of threaded fasteners by vibration-induced loosening due to dynamic shear loads. This study comprises experimental analysis and numerical analysis. The loosening mechanism of threaded fasteners for complex structures is analytically and experimentally identified. This work provides the equations and assessment method for the loosening, and the criteria of primary and secondary loosening are established. To verify the proposed loosening mechanism, tightening and loosening experiments are conducted for three types of bolted joints. The primary and secondary loosening forces of each bolt are thus obtained, and the proposed loosening mechanism can be verified for complex structures. In numerical analysis, a three-dimensional finite element (FE) model for tightening and loosening analysis is proposed. A FE model is used to study the loosening process which is characterized by a decline of the preload and moving distance for predicting loosening states. The model seems to be well agreement in comparison with theoretical and experimental results. As a result, the assessment method shows good performance in predicting loosening state. It is expected to verify the safety of bolted structures at the design stage. The FE model is expected to be used for the effective and safe design for joint components in various industrial fields such as wheel assemblies and other mechanical components under dynamic vibration.
机译：螺纹紧固件广泛用于机械结构，主要是由于它们易于拆卸，以便维护和低成本。然而，过去六十年来，由于动态负荷引起的螺纹紧固件的松动机理仍不清楚。目前对包含三个或更多个组分的复杂结构的研究不足。经过动态负荷的螺纹紧固件的两个最常见的故障模式是疲劳和振动引起的松动。本研究专注于由于动态剪切载荷引起的振动引起的螺纹紧固件失效。该研究包括实验分析和数值分析。分析和实验识别复杂结构的螺纹紧固件的松动机构。该工作提供了放松的方程和评估方法，建立了初级和二次松动的标准。为了验证所提出的松动机构，对三种类型的螺栓接头进行紧固和松动实验。由此获得每个螺栓的初级和二次松动力，并且可以验证所提出的松动机构以用于复杂结构。在数值分析中，提出了一种用于收紧和松开分析的三维有限元（FE）模型。 FE模型用于研究放松的过程，其特征在于预热和移动距离的下降，以预测松动状态。与理论和实验结果相比，该模型似乎很好。结果，评估方法在预测松动状态下显示出良好的性能。预计将验证设计阶段的螺栓结构的安全性。预计FE模型将用于各种工业领域的联合部件的有效和安全的设计，如车轮组件和其他机械部件在动态振动下。

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