T. Mukaiyama, Graduate school, Toyohashi University of Technology, Toyohashi, Japan; M. Niinomi, H. Toda, T. Kobayashi, T. Akahori, Toyohashi University of Technology, Toyohashi, Japan; I. Yamamoto, Osaka Kyoiku University, Kashiwara, Japan

Summary: A close relationship between the fracture surface geometry and absorbed energy is believed to be stand in the fracture of metallic materials. Macroscopic features called as shear lip or plastic hinge is, in general, observed on the ductile fracture surface. Microscopic features reflecting minute variation of fracture surface geometry is also associated with absorbed energy. The relationships between absorbed energy and fracture surface features of wrought aluminum alloys, 5083-O, 6061-T651 and 7075-T6 aluminum alloys, were studied. The fracture surface geometry can be measured stereoscopically instead of a conventional planar measurement method. The variation of absorbed energy with loading rate is then compared with the variation of micro- and macro-features in a wide loading rate range in order to clarify the relationship between absorbed energy and fracture surface area. It is found there are correlations between absorbed energy and fracture surface area in these aluminum alloys.