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首页> 外文会议>ASME pressure vessels and piping conference;PVP2009 >Finite Element Analysis of the Fatigue Strength of Threaded Fasteners Using Helical Thread Models
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Finite Element Analysis of the Fatigue Strength of Threaded Fasteners Using Helical Thread Models

机译：螺旋螺纹模型对螺纹紧固件疲劳强度的有限元分析

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Fatigue failures of bolted joints frequently lead to serious accidents of machines and structures. It is well known that fatigue failure is likely to occur around the first thread root of bolt adjacent to the nut loaded surface and the run-out of bolt thread. That is because high stress amplitudes are generated there due to alternating external forces. Accordingly, it is significantly important to evaluate the stress amplitudes along the thread root in order to better define the fatigue failure mechanism of bolted joints.In this study, stress amplitude distributions along the thread helix including the thread run-out are analyzed by three-dimensional finite element analysis, where the numerical models of bolted joints are constructed so as to accurately take account of the effect of thread helical geometry, using the modeling scheme proposed in the previous paper. The analytical objectives are bolted joints with axi-symmetric geometry except for the helical-shaped threaded portions, and are subjected to axi-symmetric external forces. It has been substantiated, based on the stress amplitude distributions along the thread helix, that the fatigue failures are likely to originate from the first bolt thread, as in the case of the maximum stress, and the run-out of threads. Also shown is that the fatigue failure location varies depending on the distance between the target bolt and the loading position and whether or not there is a separation at the plate interface.
机译：螺栓连接的疲劳故障经常导致机器和结构的严重事故。众所周知，在与螺母加载表面相邻的螺栓的第一螺纹根附近和螺栓的跳动可能会发生疲劳破坏。那是因为在那里由于交变的外力而产生高应力振幅。因此，评估沿螺纹根部的应力幅度以更好地定义螺栓连接的疲劳破坏机理非常重要。 在这项研究中，通过三维有限元分析分析了包括螺纹跳动在内的沿螺纹螺旋线的应力振幅分布，其中建立了螺栓连接的数值模型，以便准确地考虑螺纹螺旋几何形状的影响，使用先前论文中提出的建模方案。分析目标是除螺旋形螺纹部分外的具有轴对称几何形状的螺栓接头，并承受轴对称外力。根据沿螺纹螺旋的应力振幅分布已证实，疲劳破坏很可能源自第一螺栓螺纹，如最大应力的情况，以及螺纹的跳动。还示出了疲劳失效位置根据目标螺栓与加载位置之间的距离以及板界面处是否存在间隔而变化。

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