Strength prediction in CFRP woven laminate bolted single-lap joints under quasi-static loading using XFEM

摘要

This paper is concerned with modelling damage and fracture in woven fabric CFRP single-lap boltedjoints that fail by net-tension. The approach is based on the assumption that damage (matrix cracking,delamination and fibre tow fracture) initiates and propagates from the hole in a self-similar fashion. Atraction–separation law (based on physically meaningful material parameters) is implemented withinan Extended Finite Element Method (XFEM) framework and used to predict the joint strength. Reasonableagreement between model and experiment was obtained for test configurations covering different weavetypes and lay-ups, a range of joint geometries (two hole diameters and a range of normalised jointwidths) and finger-tight and fully torqued clamp-up conditions. The greatest discrepancies were forsituations where the tensile fracture mechanisms were more complex, and hence not captured fully inthe model or when bearing failure occurred.