微观尺度材料三维位移场与应变场的快速精密测量方法的研究

项目名称： 微观尺度材料三维位移场与应变场的快速精密测量方法的研究

项目编号： No.51275389

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 王立忠

作者单位： 西安交通大学

项目金额： 80万元

中文摘要： 塑性变形过程中位移场和应变场快速精密测量具有重要的理论和实用意义。本项目通过光学显微镜，获取材料变形过程的序列二维显微图像，分别采用显微双目立体视觉和单目多视角摄影测量方法，实现多幅二维显微图像的立体匹配和三维重建。基于数字图像相关法，实现被测物体表面散乱图案在变形过程序列图像中的自动识别和跟踪，从而获得每个变形状态全场"相关窗"的三维坐标和形貌，进而解算出被测物体在各变形状态微观尺度的三维全场位移场和应变场。主要采用数字图像相关法、工业近景摄影测量技术与机器视觉技术，重点研究光学显微镜成像系统的数学模型与高精度标定方法、显微图像畸变校正方法、显微双目和单目多视角三维重建方法，以及显微散乱图案相关性计算。揭示数字图像相关法显微成像三维位移场和应变场的测量规律，为机械、力学、生物等学科的微观尺度材料塑性变形研究，提供一种快速精密的测量分析方法。

中文关键词： 光学显微系统；标定；畸变；数字图像相关；三维重建

英文摘要： During the plastic deformation, the measurement of displacement and strain field has important theoretical and practical significance.At first, the project gets 2D microscopic image sequence through optical microscope, then realizes 2D microscopic image matching and 3D reconstruction using microscopic binocular stereo vision and monocular measuring methods of photography. Finally, based on digital image correlation method, realizes automatic identification and tracking of scattered pattern on the object surface during the deformation process, so as to achieve 3D coordinate and morphology of "related window" in each deformation state, and calculate the full-field deformation and strain of the objects in the micro-scale. The project mainly uses digital image correlation, close-range photogrammetry and machine vision technology, focuses on the mathematical model of the optical and electron microscopy imaging system and high-precision calibration method, the microscopic image distortion correction method, microscopic binocular and monocular perspective three-dimensional reconstruction methods, and microscopic scattered pattern correlation calculation. It reveals the law of full-field strain measurement based on the digital image correlation method, provides a quick and easy measurement and analysis method to the mic

英文关键词： Optical microscopy system；Calibration；Distortion；Digital image correlation；3D reconstruction