3D TOPOGRAPHY OF FRACTURED SURFACES AND MECHANICAL PROPERTIES UNDER INSTRUMENTED IMPACT LOADING
系列示波冲击断口三维形貌几何特征和断裂性能

The dynamic fracture properties of P460NLl steel were tested under instrumented impact loading at different test temperatures. The 3D topography of fractured surfaces was reconstructed and quantified by the means of SEM stereo pairs, image processing and analysis, and computer vision. It was shown that measured 3D roughness indexes Rs, Rq and Rmax have good positive relations to the crack propagation part of absorbed impact energy. Although fractal behavior had been checked out on the fractured surfaces, the fractal dimension was found nonsensitive to the fracture mode and mechanical properties. The geometric characteristics of fractal fractured surfaces should be quantified in fractal dimension together with absolute parameters.