In this study, a new fast approach to predict the net-tension failure strength of multi-bolt composite joints was developed based on finite fracture mechanics and p-version parametric finite element methods. In the proposed approach, stress distribution and stress intensity factor are obtained using the principle of superposition, based on which the problem can be divided into open hole tension and hole bearing problems. The stress distribution and stress intensity factor are determined by using p-version parametric finite element models, which is very computational efficient and can address laminates with arbitrary layup. For the validation purpose, the failure strengths of three multi-bolted joints were predicted and compared to the test data from public literatures, and good agreements were obtained. In addition, the effects of typical parameter variations on the net-tension failure strength were presented by performing a series of parametric studies, which would be a reference for engineering design of multi-bolt composite joints.

在这项研究中，基于有限断裂力学和p版本参数化有限元方法，开发了一种预测多螺栓复合节点净拉强度的新方法。在该方法中，利用叠加原理获得了应力分布和应力强度因子，在此基础上，可以将问题分为裸眼张紧问题和承压问题。应力分布和应力强度因子是使用p版本参数有限元模型确定的，该模型具有很高的计算效率，并且可以处理具有任意铺层的层压板。为了验证目的，预测了三个多点螺栓接头的破坏强度，并将其与公共文献的测试数据进行了比较，并获得了良好的一致性。此外，