一种多钉铆接连接件的疲劳寿命分析方法

针对目前对多钉铆接连接件进行疲劳寿命分析时的可行性不高、计算量较大等问题，提出一种更加有效可靠的预测多钉铆接连接件的疲劳寿命的方法。对多钉铆接连接件进行疲劳寿命分析时，先对压铆铆接过程进行了显示动力学分析，获得铆接后的钉、孔变形形式和干涉量，并编写了APDL子程序用于各种形式试件的铆接过程分析。用紧固件的载荷-位移曲线进行细节应力分析。基于三维弹塑性有限元法建立铆接连接件的载荷-位移计算方法，并通过与试验结果对比，说明用本文方法获取载荷-位移曲线的可靠性。在ANSYS中建立钉单元，并实现参数化建模进行钉载计算。使用应力严重系数法估算连接件疲劳寿命。开展典型航空铆接连接件疲劳试验，计算结果与试验结果一致性较好，说明计算方法的可行性。 

A fatigue life analysis method for multiple riveted joint

In the analysis of fatigue life of multiple riveted joints, the explicit dynamic analysis of the pressing and riveting process was carried out, and the deformation form and interference after riveting process were obtained. An APDL subroutine was developed to analyze the riveting process of various forms of specimens. Detailed stress was analyzed by using load-displacement curves of fastener. The load-displacement calculation method of riveted joint was proposed based on the three-dimensional elastoplastic finite element method, and compared with the experimental results, the reliability of using this method to obtain load-displacement curves was validated. Riveting units were established in ANSYS by using parametric modeling to carry out the calculation of riveting load. The fatigue life of the joint is estimated by the stress severity coefficient method. The fatigue test of typical aviation riveted joint was carried out. The calculation results are in good agreement with the test results, which indicates the feasibility of this method.