应用数字图像相关方法测试航空复合材料的弹性常数

Measurement of Elastic Constants for Aviation Composite Materials Using Digital Image Correlation Method

通过数字图像相关方法对三种航空复合材料的弹性常数进行了测试。通过对DICM理论分析,依据ASTM标准提出合理的测试方案使得DICM的应变测试精度达到25με,满足航空复合材料测试要求。同时应用DICM和电测法对比测试了三种不同航空复合材料的弹性常数,实验结果表明这两种方法得到的实验结果相对误差较小,应力-应变曲线基本重合,DICM能够很好地反映航空复合材料的应变响应和精确测试其弹性常数。

The elastic constants for three kinds of aviation composite materials were measured using digital image correlation method （DICM） and the feasibility of DICM measuring elastic constants for aviation composite materials detailedly was studied. By theoretical analysis of DICM and proposing measuring method according to ASTM, the strain measurement precision could reach 25με. It meets the test requirement of aviation composite materials. The elastic constants for three different compos- ite materials were measured by DICM and strain gauge method simultaneously, the results of the two methods are consistent. It demonstrates that DICM can measure the strain of aviation composite mate- rials accurately.