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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.

本文得到了三种新的结果。首先，开发了边界元法和有限元法联合分析程序。前者的优点是能在较窄的区域内求解大变形和弹塑性问题，后者的优点是能在较宽的区域内求解弹性问题。将该程序应用于圆形冲头的压痕试验，得到了小尺寸和大尺寸试样的压痕力和变形的差异。该方法可用于硬度测试的研究。第二，提出了一种新的实验数据处理方法。在试件上印上许多圆来测量应变--划圆法。本文提出了一种利用图像传感器对圆的内侧进行扫描的方法来检测圆。该方法可方便地推广到此类应变测量的应用领域。第三，实验研究了冲头压入条件下试样的定性变形。采用划圆法给出了等效塑性应变的等值线图，并对接触区两端附近的区域进行了高应变分析。在试样变形中，也不能清楚地看出冲头与试样之间有无润滑脂的影响。上述分析处理方法可用于材料塑性加工中的变形和破坏。