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针对板料变形中应变检测的常规方法和传统方法存在的不足,通过数字散斑相关方法、计算机双目视觉理论和材料力学理论分析了试件表面变形前后的散斑图像,来动态跟踪试件表面上几何点的运动并得到三维位移场,在此基础上计算得到试件的三维应变场。基于此原理开发了XJTUDIC三维数字散斑动态应变测量分析系统。应用带孔铝质制件进行了单向拉伸实验。测量结果表明,该系统能较好的反映板料变形过程中的三维应变状态,较好的测量试件表面的三维轮廓,直观再现工件表面的变形场、应变场和成形极限图(FLD),对于需要测量的关键点可以实现重点跟踪,动态测量出该点在任意时刻任意位移的应变。该系统可以应用到不同的力学测量现场。
Aiming at the shortcomings of the conventional methods and the traditional methods of strain detection in sheet metal deformation, speckle images before and after the surface deformation are analyzed by digital speckle correlation method, computer vision theory and material mechanics theory to dynamically track the specimen On the surface of the geometric point of motion and get three-dimensional displacement field, on this basis, the calculated three-dimensional specimen strain field. Based on this principle, XJTUDIC three-dimensional digital speckle dynamic strain measurement and analysis system was developed. Uniaxial tensile test was carried out using perforated aluminum parts. The measurement results show that the system can better reflect the three-dimensional strain state during sheet deformation, better measure the three-dimensional profile of the specimen surface, visualize the deformation field, strain field and forming limit (FLD) of the workpiece surface, For the key points that need to be measured, the key points can be tracked, and the strain of any point displaced at any moment can be measured dynamically. The system can be applied to different mechanical measurement sites.