3D Profilometry Detection And Characterization Analysis Of Metal Fracture

Due process errors or long-term exposure to adverse external factors (power,temperature,humidity and etc), The mechanical components structural characteristics occurrence some even whole change which will lead original mechanical function failure. However, The morphology data of mechanical component surface may provide to judge and analyze failure mechanism by intuitive effective information, So we need to analyze the mechanical component surface morphology. In a variety of micro-surface morphology measurement method, white-light phase-shifting interference technique can not only achieve three-dimensional and micro-level precision of the fast sodium non-contact measurement, and the system is simple, low cost. Based on the above, this paper the white-light phase-shifting interference technique is used to detect and analyze 3-d morphology of metal fracture.This paper introduces white-light phase-shifting interferometry system based on PZT micro-scanning and positioning device, which we mainly discuss on how to select the light source, micro-lens, CCD detectors and other devices and adopt a new fast FFT block algorithm to improve three-dimensional reconstruction rate of PZT micro- scanning and positioning system. What's more, using white light scanning interferometry, 30CrMnSiA alloy fatigue fracture with dimples of micro-complex surface morphology is detected and high-quality three-dimensional microscopic morphology reconstruction of the fracture has gradually completed space frequency domain algorithm, fast FFT block algorithm.In order to characterize and analyze the data of three-dimensional shape, different evaluation results of reconstructing the 3D morphology are given by 2D-Motif method, three-dimensional fractal method and the 3D-Motif characterization method. the investigation shows that compared to two-dimensional representation method, the results of three-dimensional evaluation better reflect fatigue and dimple alloy surface topography of three-dimensional real; for dimple fracture and fatigue fracture, three-dimensional fractal law is applicable to evaluate microscopic surface roughness of the two kinds of fracture, however, 3D-Motif method is more suitable for Characterization of the dimple. this can be useful for quantitative analysis of the mechanism of metal fracture Combining with mechanical properties.