基于仿真分析的压铆力预测模型

摘要

Riveting is the main way of mechanical connection for aircraft structures, and the riveting force is an im-portant factor affecting the quality of riveting. Traditional computation methods of riveting force are usually based on the constant-volume assumption, without considering the volume of the rivet material being pressed into the rivet hole, which caused the big error of the model. To this end, according to the simulation results and the flow trend of rivet material, the volume reduction coefficient is introduced to take into account the volume of the nail bar being pressed into the rivet hole, establishing a prediction model of riveting force and comparing with the available experimental data. The results show that the calculated values are in good agreement with the experimental ones, so this model can be used to predict the magnitude of riveting force in riveting process.%铆接是飞机结构机械连接的主要方式,压铆力作为影响铆接质量的重要因素,传统的计算方法通常是建立在体积不变的假设之上,且不考虑钉杆材料被压入钉孔部分的体积,导致模型误差较大.为此,依据仿真分析结果和铆钉材料的流动趋势,引入体积缩减系数来描述钉杆被压入钉孔部分的体积,建立压铆力预测模型,并与已有的试验数据进行对比,结果表明计算值与试验值的一致性较好,该模型可以用来预测铆接过程中压铆力的大小.