基于数字近景测量技术反演材料弹性模量新方法

发布时间：2018-02-09 11:41

本文关键词： 材料压缩实验数字近景测量技术有限元方法数值反演　出处：《应用力学学报》2017年04期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The digital close-range measurement technique is introduced into the material mechanics experiment to measure the elastic parameters of the material. When the universal experimental machine is used to carry out the experiment, due to the contact friction between the pressure plate and the surface of the specimen, the uniform deformation of the specimen is affected. The precision of the measured parameters is not high. In this paper, using the high-definition digital camera Canon700D as the tool and the square homogeneous rubber specimen with a side length of 200mm as the experimental object, the two-dimensional coordinates before and after the deformation of each point on the surface of the specimen in the camera image are extracted by AutoCAD. The deformation data of each point on the surface of the specimen are obtained, and the numerical inversion analysis of the experimental process is carried out with ANSYS, and the material parameters obtained from the experiment are corrected. The results show that: combining the digital close-range measurement technology with the numerical simulation of ANSYS, More accurate deformation data can be obtained, and the relative error is only 0.134, which plays a theoretical guiding role in the subsequent practical engineering survey.
【作者单位】：青海民族大学建筑工程学院;青海华电大通发电有限公司;
【基金】：战略布局-产学研培育(2015XZS-0029) 青海民族大学大学生创新训练项目(DCXM-2015-015;DCXM-2015-019;DCXM-2015-018);青海民族大学校级科研项目青年项目(2015XJZ22)
【分类号】：TB301

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