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Due to process errors or long exposure under adverse external factors (force, temperature , humidity , etc. ) , the structural characteristics of the mechanical member , part or the overall change the final result of the mechanical functions of the original failure , while the surface topography data of the mechanical member on judgments and analysis of the failure mechanisms to provide intuitive and effective information , so we need to analyze the workpiece surface morphology . In various micro- surface topography measurement method , the white phase shifting interferometry not only be able to achieve a three-dimensional micro-and nano -level precision rapid non-contact measurement , the system is simple , low cost . In this paper, the white phase shift interferometry for detection and analysis of metal material fracture three-dimensional morphology . This article describes the interferometric measurement system based on the scanning PZT micro-nano positioning device white phase shift , selected mainly on the light source , microscope objective , detector CCD devices ; using a fast FFT block algorithm to improve the PZT precision Micronano scan positioning system slow rate of three-dimensional reconstruction of the shortcomings , the experiments show that the new algorithm can improve the efficiency of the system imaging . Second , using white light scanning interferometry to detect microscopic complex morphology of 30CrMnSiA alloy fatigue and dimple fracture surface , and the spatial frequency domain algorithm , the fast FFT block algorithm gradually completed the reconstruction of the fracture surface of microscopic three-dimensional morphology of high-quality . By 2D-Motif characterization method , three-dimensional fractal characterization method and 3D-Motif characterization method to reconstruct the three-dimensional morphology , respectively, given the evaluation results of the 2D-Motif , three-dimensional fractal dimension in order to characterize the three-dimensional morphology processing data and assessment of the results of the 3D-Motif , research shows that compared with the two-dimensional characterization method , three - dimensional assessment results better reflect the alloy fatigue and dimples in the fracture surface morphology of the three-dimensional real terms ; also found for fatigue and fracture of dimple two and three-dimensional fractal the Act applies to the two types of fracture microscopic surface roughness , 3D-Motif rule is more suitable for the characterization of dimple fracture , which provide for the further integration of the mechanical properties quantitative analysis of microscopic metal fracture mechanism of help .
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