Abstract
It is believed that there exists a close relationship between the deformation on fracture surface and the fracture toughness. On the ductile fracture surface, it is known that macroscopic deformation called shear lip or plastic hinge is observed. In addition, microscopic deformation reflecting minute variation of geometry like fracture surface area is also associated with toughness. In this paper, measurement of fracture was performed by laser displacement meter and scanning laser microscope. Using these devices, instead of conventional planar measurement method, fracture surface can be measured stereoscopically. The macroscopic deformation, microscopic deformation, volume of shear lip and fracture surface area were determined, respectively. Therefore, it enables the investigation of the relationships between toughness at loading speed from 8.3 × 10−6 m/s to 8 m/s and these fracture surface features on 6061–T651 aluminum alloy. The results demonstrated that there is a good agreement between the variation of loading speed for toughness testing and the total fracture surface area.
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