光学透视测量玻璃纤维增强复合材料板离面应变场分布

本文通过激光波数扫描干涉测量系统和方法,透视测量商用玻璃纤维增强复合材料板前、后表面的离面应变场分布。实验中分别对有缺陷和无缺陷的商用玻璃纤维增强复合材料样品进行了离面位移场测量和平均轴向正应变场分布计算。无缺陷样品的离面位移场及压缩应变场分布均匀连续,随加载呈现递增压缩变化;有缺陷样品的缺陷周围的离面位移场分布变化无规则,其压缩正应变分布以缺陷孔洞为中心,加载量越大,孔洞周围其压缩正应变值较小的区域越大,压缩正应变集中在远离孔洞的边缘区域,随加载量变化压缩应变场分布无线性规律。实验结果证明,激光波数扫描干涉测量系统和方法准确可靠,它为玻璃纤维增强复合材料板的力学性能测量提供了一个新技术平台。

Optical Perspective Measurement of the Out-of-Plane Strain on the Front and Rear Surfaces of Commercial Glass-Fiber Reinforced Composite Plate

A new measurement system and related measuring method are proposed in this paper, which can be used to perspectively measure the out of plane strain field distribution on the front and rear surface for commercial glass-fiber reinforced composite, based on laser wave number scanning interferometry. In experiment, measurement of the out of plane displacement field and calculation of the average axial normal strain field distributions were conducted for commercial glass fiber reinforced composite samples with and without defect, respectively. The out of plane displacement field and compression strain field distribution of samples without defect are uniformly continuous, and present change linearly proportional to the applied load. While the out of plane displacement field around the defect of samples with defect presents an irregular variation. Its compression normal strain distribution centered on the defect hole, the greater the applied load is, the bigger the small compression strain area around the hole. The compression strain is concentrated in the area far away from the edge of the hole. Furthermore, the variation of compression strain field distribution is not linearly proportional to the applied load. Experimental results indicate that the proposed measurement system and related measuring method provide a new technical platform for mechanical property measurement of commercial glass fiber reinforced composite.