Indentatio with Punch by BEM/FEM Analysis and Image-sensing Method

通过 BEM/FEM 分析和图像传感方法进行冲压压痕

基本信息

批准号：
63550500
负责人：
SAWADA Takao
金额：
$ 1.54万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Three kind of new results are obtained in this report. First, this program for the combined analysis with BEM(boundary element method) and FEM(finite element method) is developed. The former has the merit for solving the large deformation and elastic-plastic problems in a narrow domain, and the latter for the elastic problems in a wide domain. This program is applied for the indentaffon by a circular punch, and there can be found the differences of the indentation force and the deformation of the specimen between a small and a large size of the specimen. This approach is available for the study of the hardness testing. Second, a new data processing method for experimental results is developed. Many circles printed in the specimen are used to measure the strain ---- the scribed circle method. In this report the method to detect the circles by using an image-sensing camera is found out, which scans the inner side of each circle. This method can be easily extended to the applied field of this kind of strain measurement. Third, the qualitative deformation of the specimen under indentation with punch is found out experimentally. The contours of the equivalent plastic strain are presented by using the scribed circle method, and the domains near the both ends of the contact area are strained in high level. Also the effects with and without grease between the punch and the specimen can not be found out clearly in the deformation in the specimen. The above analytical processing methods can be applied for deformation and failure of the material in the plastic working.

本报告将获得三种新结果。首先，开发了与BEM（边界元素方法）和FEM（有限元方法）组合分析的程序。前者具有解决狭窄域中大变形和弹性问题的优点，而后者是宽区域中的弹性问题。该程序通过圆形打孔器应用于缩进措施，可以发现凹痕力的差异以及小标本和大尺寸的样品之间的样品的变形。这种方法可用于研究硬度测试。其次，开发了一种用于实验结果的新数据处理方法。样品中印刷的许多圆圈用于测量折纸圆方法的应变。在本报告中，发现使用图像感应摄像头检测圆的方法，从而扫描每个圆的内侧。该方法可以很容易地扩展到这种应变测量的应用场。第三，通过实验发现了用拳头在压痕下的试样的定性变形。通过使用涂抹圆形方法显示等效塑料应变的轮廓，并在接触区域两端附近的域高水平张紧。同样，在样品中的变形中找不到在打孔器和样品之间带有油脂的效果。上述分析处理方法可用于塑料工作中材料的变形和故障。