三维编织复合材料应变测量方法对比研究  

Comparison of Different Strain Measurement Methods for 3D Braided Composites

作　　者：蒲浩 王育鹏[1] 杨胜春[1] 李磊[1] Pu Hao;Wang Yupeng;Yang Shengchun;Li Lei(Aircraft Strength Research Institute of China,Xi′an 710065,Shaanxi,China)

机构地区：[1]中国飞机强度研究所,陕西西安710065

出　　处：《工程与试验》2023年第1期30-33,共4页Engineering and Test

摘　　要：针对三维编织复合材料受载时应变场不均匀、试样表面较小区域的应变数据不能真实反映材料的整体变形等问题,本文通过经向无缺口拉伸试验,进行了3种不同丝栅尺寸应变计、引伸计和非接触式三维全场应变测量系统的应变测量结果对比分析。研究结果表明,三维编织复合材料受载时应变场分布是不均匀的,且变形量差异较大;采用更大丝栅尺寸的应变计可以降低三维编织复合材料变形不均匀的影响,获得更准确的应变结果;非接触式三维全场应变测量可以准确反映被测试样的全场应变,为三维编织复合材料的力学性能测试提供准确的应变数据。Aiming at the problem that the strain field of 3D braided composite is not uniform when it is loaded,the strain data of a small area on the surface of the sample cannot truly reflect the overall deformation of the material.In this paper,the strain measurement results of three different wire grid strain gauges,extensometers and non-contact 3D full-field strain measurement systems are compared and analyzed by the warp unnotched tensile test.The research results show that the strain field distribution of 3D braided composite is non-uniform under load,and the deformation amount varies greatly.The usage of strain gauge with a larger wire grid size can reduce the influence of non-uniform deformation of 3D braided composite,and obtain more accurate results.The non-contact 3D full-field strain measurement can accurately reflect the full-field strain of the tested sample,and provide accurate strain data for the mechanical property test of 3D braided composites.

关 键 词：三维编织复合材料 力学性能测试 无缺口拉伸试验 应变测量技术 

分 类 号：TB302[一般工业技术—材料科学与工程]