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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。
In this paper, through the laser wave number scanning interferometry system and method, the out-plane strain field distribution of the front and back surface of commercial glass fiber reinforced composite sheet is measured through perspective. In the experiment, the measurement of out-plane displacement field and the calculation of the average axial normal strain field of commercial glass fiber reinforced composite samples with defects and no defects respectively were carried out. The non-defective samples have uniform and continuous displacement fields and compressive strain fields, which show increasing compressive change with loading. The displacement field distribution of out-of-plane changes around the defects of defect samples is irregular. The normal strain distribution of compressive strain centers on the defect pores, The larger the loading is, the larger the positive compressive strain around the hole is. The positive compressive stress is concentrated in the edge away from the hole. The nonlinear distribution of compressive strain field varies with the loading. The experimental results show that the laser wave number scanning interferometry system and method are accurate and reliable, which provides a new technology platform for the mechanical properties measurement of glass fiber reinforced composite sheet.