双剪多排螺栓连接螺栓孔接触域应力分布研究

基于接触问题的研究方法。利用由MSC．Patraan/Nastran软件建立的多排双剪螺栓连接有限元模型，对螺栓～孔接触域上的应力分布进行了研究。研究过程中主要考虑在不同的间隙和接触面粗糙度下，各排螺栓的应力分布变化规律。研究发现间隙和粗糙度对孔受压面上的应力影响较大，但不能破坏各排螺栓孔应力分布规律的相似性。在建模过程中，将螺栓定义为可变性接触体，考虑了螺栓与铝板之间的接触摩擦以及相互间弹性变彤．比以往的刚性体螺栓具有曼高的准确性和可靠性．

Stress Distribution Around Bolt-Hole Contact Areas in Multiple Bolt-Jointed Plates

Based on the method of dealing with contact problem,a finite element analysis model of multiple bolt-jointed plate was established by MSC.Patran/Nastran software. The stress distribution around bolt-hole contact area was investigated. During analyzing variation of stress distribution in each row of bolt hole,the changes of the bolt-hole clearance and the roughness on the contact surface were mainly considered. It is found that bolt-hole clearance and friction coefficent have greater influences on stress distribution in the bolt-hole extruded surface ,but these factors can not destroy the similarity of stress distribution in each row of bolts. In the process of modeling,the bolt wss defined as the flexible contact body. Considering the contact friction as well as elastic deformation between the bolt and aluminum plate,the results are more accurate and reliable than that of previous analysis model that bohs were defined as the rigid body.