复合材料波纹褶皱区域损伤变形测量及声发射监测

发布时间：2018-07-07 17:49

本文选题：复合材料 + 波纹褶皱　；参考：《玻璃钢/复合材料》2017年08期

【摘要】：对含波纹褶皱缺陷的玻璃纤维单向复合材料进行压缩试验,结合声发射(Acoustic Emission,简称"AE")和数字图像相关(Digital Image Correlation,简称"DIC")互补技术,研究复合材料波纹褶皱区域的损伤变形与演化规律。在复合材料试件压缩加载的过程中,采集波纹褶皱区域损伤变形场、应变场信息和实时声发射监测信号,分析复合材料压缩力学响应行为与缺陷区域变形场、应变场以及声发射信号特征之间的对应关系。结果表明:波纹褶皱会严重影响复合材料的力学性能,通过分析声发射信号,发现随着波纹褶皱宽高比减小,复合材料的力学性能呈现降低的趋势;当波纹褶皱宽高比一定时,随着波纹褶皱高度不断增加,复合材料的力学性能呈现降低的趋势。通过DIC测得的应变场与位移场信息,发现对于相同的载荷增量,最大应变呈增加趋势,且波纹褶皱宽高比越大应变增幅越大;越趋近于褶皱中部,水平位移越大,加载方向位移与试件失稳破坏位置有关,接近破坏区域的加载方向位移大。损伤区域位移场和应变场清晰地反映了玻璃纤维复合材料的损伤变形特征。
[Abstract]:The compression test of unidirectional glass fiber composites with corrugated fold defects was carried out, and the damage deformation and evolution of the corrugated fold region of composites were studied by combining the complementary techniques of Acoustic emission (AE) and digital image correlation (DIC). During the compression loading of composite material, the damage and deformation field, strain field information and real time acoustic emission monitoring signal of corrugated fold region are collected, and the compressive mechanical response behavior and the deformation field in defect region of composite material are analyzed. The corresponding relationship between strain field and acoustic emission signal. The results show that corrugated folds will seriously affect the mechanical properties of the composites. By analyzing the acoustic emission signals, it is found that the mechanical properties of the composites decrease with the decrease of the ratio of width to height of the ripple folds, and when the ratio of the width to the height of the ripple folds is fixed, With the increasing of corrugated fold height, the mechanical properties of the composites decrease. According to the information of strain field and displacement field measured by DIC, it is found that the maximum strain tends to increase for the same load increment, and the larger the ratio of width to height of corrugated fold is, the larger the strain increases, and the closer to the middle part of the fold, the greater the horizontal displacement is. The loading direction displacement is related to the failure position of the specimen, and the loading direction displacement near the failure region is large. The displacement and strain fields in the damage zone clearly reflect the damage and deformation characteristics of glass fiber composites.
【作者单位】：河北大学无损检测研究所;承德石油高等专科学校资产与后勤管理处;
【基金】：河北省教育厅重点项目(ZD2016097) 河北省自然科学基金(F2015201215) 河北大学校级项目(799207217089)
【分类号】：TB33

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