Ti-Al层状复合板II型层间断裂关键参量研究

The effect law of specimen width, specimen length, prefabricated crack length and bending mode on the load-displacement variation was analyzed by means of the single edge crack three point bending test (3ENF). The reasonable specimen size of 3ENF was optimized, which were 70 mm in length, 5 mm in width, 25 mm in pre-crack length and the titanium layer bended on the outside. The force-displacement curves of 3ENF of Ti-Al laminated plate with reasonable specimen size were obtained. Based on the optimized specimen size, the reasonable values of two key parameters, the maximum tangential stress τ_max of 490 MPa and the characteristic displacement δ_t of 10.9 mm, at the interface of Ti-Al laminated composite plate were obtained by calculation respectively. The research results provide an important data support for the subsequent study of the interfacial delamination damage and failure behavior of Ti-Al laminated plate during cold plastic forming by finite element method.