用嵌入螺柱法测量金属体内塑性应变分布

SCREW METHOD FOR MEASURING STRAIN DISTRIBUTION IN METAL PLASTIC DEFORMATION BODY

为解决传统塑性应变测试方法无法有效地测量体积成形中金属体内应变分布的问题,提出了一种测量金属塑性应变的新方法．其原理是将工件加工成内部嵌入螺柱的组合件,对组合件进行塑性变形,测量变形后组合件内部的螺纹界面的变形,进而计算相应位置上的应变．该方法可以定量给出变形体内部的应变分布,与传统的坐标网格法相比,具有不需要剖分工件、不改变应力状态的优点．该方法可应用于镦粗、挤压、模锻等塑性变形工艺中金属变形流动行为的研究．

A new method, screw method, for strain measurement was advanced to obtain the strain distribution inside metal plastic deformation body. Through implanting bolts into the specimen and measuring the deformation of the blots, the strain on the screw interface can be calculated quantitatively. Contrast to the traditional mesh grid method, the screw method does not split the specimen and can be used for open forging without changing the stress state.