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将数字近景测量技术引入材料力学实验用于测量材料的弹性参数。在采用万能实验机进行实验时,由于实验机承压板与试件表面存在接触摩擦,影响试件均匀变形,导致测得参数精度不高。本文以高清数码相机Canon700D为工具,以边长为200mm的正方体均质橡胶试件为实验对象,通过AutoCAD提取摄像图像中试件表面各点变形前后的二维坐标,获得试件表面各点的变形数据;结合ANSYS对实验过程进行数值反演分析,修正实验获得的材料参数。研究结果表明:结合数字近景测量技术与ANSYS数值模拟,可以获得更精确的变形数据,相对误差仅为0.134%,对后续实际工程测量起到了理论指导作用。
Digital close-range measurement technology into the material mechanics experiment for measuring the elastic parameters of the material. In the experiment with universal testing machine, due to the experimental machine bearing plate and the specimen surface contact friction, affect the specimen uniform deformation, resulting in the measured parameter accuracy is not high. In this paper, a high-definition digital camera Canon700D as a tool, with a side of 200mm cube homogenized rubber specimens as the experimental object, through the AutoCAD extraction of the image of the specimen surface before and after deformation of the two-dimensional coordinates of each point to obtain the specimen surface points Deformation data; combined with ANSYS numerical inversion of the experimental process analysis, modify the experimental material parameters obtained. The results show that the combination of digital close-range measurement technology and ANSYS numerical simulation can obtain more accurate deformation data with a relative error of only 0.134%, which plays a theoretical guiding role in the subsequent actual engineering measurement.