Abstract
Fracture behaviors of hybrid composite joint for tilting car body were evaluated under static and cyclic loadings. Two species of specimens were fabricated; a hybrid bolted joint specimen for the shear test and a hybrid joint beam specimen applied in the real tilting car body for the bending test. Characteristic fracture behaviors of those specimens under cyclic loads were obviously different from the fracture under static loads. For the hybrid bolted joint specimen static shear loading caused the fracture of the bolt body itself to be a pure shear mode, whereas cyclic shear loading brought about the fracture at the site of local tensile stress concentration. For the hybrid joint beam specimen static bend loading caused the shear deformation and fracture in the honeycomb core region, while cyclic bend loading did the delamination along the interface between composite skin and honeycomb core layers as well as the fracture of welded joint part. Those fracture behaviors were reflected in design parameter improvement for the hybrid joint structure in the real tilting car body
