Elevatation of Bearing Strength on Mechanically Fastened Carbon/Epoxy Joints by Thermoplastic Film Stacking.

Abstract

Bearing strength is most important factor for designing the mechanical joints. Bearing failure is occurred by stress concentration around a hole. It is thought that bearing strength will be elevated by decreasing the stress concentration. In this study, we examined elevatation of bearing strength by thermoplastic film stacking into quasi-isotropic T800/#2500 joints. AE technique was used to investigate failure mechanism and kaiser effect test was performed to investigate the healthiness of materials. We determined that bearing strength was maximum stress during kaiser effect was valid. As a results, it was cleared that the healthiness of specimen was elevated by film stacking. Therefore, it is thought that film stacking is effective for designing mechanical joints. We calculated the shear stress distribution to investigate the influence of film by FEM. As a result, it was made sure that stress concentration was decreased by film.