累积损伤方法估算复合材料多钉连接强度

Multiple Bolted Joint Strength of Composite Material Estimated by Using Cumulative Damage Method

建立了分析复合材料多钉连接结构的三维有限元模型,针对多钉连接计算过程中接触状态非线性和累积损伤过程非线性造成的计算成本大和难收敛的问题,本文提出利用显式算法对多钉连接件的拉伸过程进行求解,分析多钉连接件在拉力载荷作用下的损伤演化过程,实现了对复合材料层合板机械连接结构整个承载过程的数值仿真模拟,同时进行了复合材料层合板多钉连接件的双剪拉伸试验。对比数值计算与试验结果发现,利用子程序结合显式算法计算得到的复合材料多钉连接强度值与试验相比,误差最大不超过7%。

A three dimensional finite element model is presented for the composite multiple bolted joints. Taking into account the no-linear issues exist in cumulative damage process and contact analysis, this paper figures out a new method to simulate the progress of the composite multiple bolted joints structure in tension load. This method can avoid the problems caused by no-linear issues and high cost of repeated calculating in cumulative damage model, which is compiled by explicit algorithm and ABAQUS user subroutine VUMAT, adopting three-dimensional Hashin criterion and direct stiffness degradation rule. Furthermore, this method can present the evolution of the damage and predict the failure load of composite multiple bolted joint structure. In this paper, experimental analysis has also been conducted to characterize tensile strengths for multiple bolted double lap joints.