基于不同螺纹形式的高强螺栓应力集中分析

Stress Concentration Analysis of High Strength Bolts Based on Different Thread Forms

摘要: 螺栓球节点网架的疲劳性能取决于高强螺栓的疲劳强度，大量理论试验表明应力集中是高强螺栓疲劳破坏的主要原因。本文收集了各种形式的螺栓螺纹，发现影响螺栓应力集中的主要因素包括螺纹的升角、螺栓的直径、螺纹的牙根圆角半径、螺纹的螺距、螺纹的深度、螺纹的圈数以及螺纹的缺口形式。本文通过有限元分析软件ABAQUS，定量求得不同螺纹缺口形式下高强螺栓的应力集中系数。

Abstract: The fatigue performance of bolt-and-ball joints depends on the fatigue strength of high-strength bolts. A large number of theoretical tests have shown that stress concentration is the main cause of fatigue failure of high-strength bolts. This article has collected various forms of bolt threads and found that the main factors affecting the stress concentration of the bolt include the angle of the thread, the diameter of the bolt, the radius of the root of the thread, the pitch of the thread, the depth of the thread, the number of turns of the thread, the thread, and the form of the gap. In this paper, the finite element analysis software ABAQUS is used to quantitatively determine the stress concentration factor of high-strength bolts under different thread notch forms.