• CN:11-2187/TH
  • ISSN:0577-6686

›› 1995, Vol. 31 ›› Issue (2): 93-98.

• 论文 • 上一篇    下一篇

镦粗过程中孔洞应变分布的光塑性研究

任广升;黄朝晖;白志斌   

  1. 机械部北京机电研究所;吉林工业大学
  • 发布日期:1995-03-01

EXPERIMENTAL INVESTIGATION OF STRAIN DISTRIBUTION IN CYLINDER MODEL WITH VOID IN THE CENTER DURING UPSET PROCESSES BY PHOTOPLASTIC SIMULATION

Ren Guangsheng;Huang Zhaohui;Bai Zhibin   

  1. Beijing Research Institute of Mechanical and Electrical Technology, MMI Jilin University of Technology
  • Published:1995-03-01

摘要: 采用内部带有人工生成孔洞的聚碳酸酯圆柱体作为模拟试件,对镦粗过程进行了光塑性模拟研究,直观地描绘了孔的闭合形式与过程。同时得出,孔洞的闭合需要足够大的等效应变和剪应变。采用Euler坐标进行应变的计算分析,绘出了孔洞周围应变分布曲线。结果表明,孔洞周围存在强烈的应变集中,孔洞的存在对全场应变分布有局部影响,其范围为原始直径的3~5倍,区域内应变分布不钧匀。

关键词: 光塑性, 人工孔洞, 应变分布, 影响区

Abstract: Investigation by photoplastic simulation on the mechanism. Of the void closing in a cylinder polycarbonate model with an artificial void in the center during upset processes was carried out. The way in which the void was closed was described. It was pointed out that enough effective strain and principal shearing strain were necessary for the void closing. The curve of strain distribution was drawn through computing the strains with Euler coordinate system. The results showed that there was a concentration of strain around the void, and that the void influenced partly the distribution of all strains. The influenced zone was 3 - 5 times larger than the original void, and the strain distribution within the zone was inhomogenous.

Key words: Artificial void, Influenced zone, Photoplasticity, Strain distribution