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Optimization of bolt thread stress concentrations

机译：优化螺栓螺纹应力集中

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Designs of threaded fasteners are controlled by different standards, and the number of different thread definitions is large. The most commonly used thread is probably the metric ISO thread, and this design is therefore used in the present paper. Thread root design controls the stress concentration factor of threads and therefore indirectly the bolt fatigue life. The root shape is circular, and from shape optimization for minimum stress concentration it is well known that the circular shape is seldom optimal. An axisymmetric Finite Element formulation is used to analyze the bolted connection, and a study is performed to establish the need for contact modeling with regard to finding the correct stress concentration factor. Optimization is performed with a simple parameterization with two design variables. Stress reduction of up to 9% is found in the optimization process, and some similarities are found in the optimized designs leading to the proposal of a new standard. The reductions in the stress are achieved by rather simple changes made to the cutting tool.
机译：螺纹紧固件的设计受不同标准的控制，并且不同螺纹定义的数量很多。最常用的线程可能是公制ISO线程，因此，本文使用了这种设计。螺纹根部设计控制螺纹的应力集中系数，因此间接控制螺栓的疲劳寿命。根部形状是圆形的，从最小应力集中的形状优化来看，众所周知，圆形很少是最佳的。使用轴对称有限元公式来分析螺栓连接，并进行了一项研究以建立关于寻找正确应力集中系数的接触模型的需求。通过带有两个设计变量的简单参数设置即可进行优化。在优化过程中，应力降低高达9％，并且在优化设计中发现了一些相似之处，从而提出了新标准。应力的减小是通过对切削工具进行相当简单的改变来实现的。

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