Abstract
Since interlaminar strength is weak point and difficult to predict, flaw is usually assumed in design of CFRP structures with stress discontinuity (e.g.: hole, ply drop-off slope). In this study, tensile tests for CFRP flat plate with ply drop-off slope were conducted, and numerical simulation with VCCT (virtual crack closure technique) were also conducted. The test specimen, which is based on a part of aircraft structure, includes an artificial flaw. From comparison with test results and previous studies, appropriation of the simulation method for present issue was verified. Furthermore, on the basis of the simulation as a trial, expected improvement for fracture toughness was discussed for realizing delamination-free CFRP structures and weight saving of structure.
