锻压技术

应变计式力传感器对高速拉伸载荷振荡的改善

英文标题：Improvement of load oscillation in highspeed tension by strain gauge force sensor

作者：郑韬俞宁峰连昌伟

分类号：TG142；O329

出版年,卷(期):页码：2019,44(8):124-128

摘要：

采用液压伺服试验机进行高速拉伸试验是获得材料动态力学特性最直接的实验手段，但在较高拉伸应变速率下，经常会产生载荷振荡问题。以宝钢牌号为B410LA与DP1180两种钢作为研究对象，采用试验机自带的压电式力传感器与改进的应变计式力传感器，在不同应变速率下进行单向拉伸试验。通过对比不同应变速率下的时间-载荷曲线，发现随着应变速率的增加，压电式力传感器的振荡幅度增加明显，应变速率达到500 s-1及以上，载荷振荡幅度达到30%~40%，影响载荷的测量精度；采用应变计式力传感器，在拉伸应变速率小于500 s-1的试验情况下，时间-载荷曲线上所显示得到的振荡的幅度控制在10%的范围内。

The highspeed tensile test using a hydraulic servo tester is the most direct experimental method to obtain the dynamic mechanical properties of material, but the load oscillation problem often occurs at higher tensile strain rates. For B410LA and DP1180 steels produced by Baosteel, the uniaxial tensile test was conducted at different strain rates by the orginal piezoelectric force sensor of test mechine and the improved strain gauge force sensor, and the timeload curves at different strain rates were compared. It is found that with the increasing of strain rate, the oscillation amplitude of the piezoelectric force sensor increases significantly, when the strain rate reaches 500 s-1 and above, the load oscillation amplitude reaches 30%~40%, and the measurement accuracy of load is affected. Furthermore, the oscillation amplitude shown on the time-load curve is controlled within 10% by the strain gauge force sensor in the case of the tensile strain rate less than 500 s-1.

基金项目：

作者简介：郑韬（1983-），男，本科，助理工程师 E-mail：13774293603@139.com

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