基于CT纤维增强复合材料三维变形场的测量与分析

玻璃钢/复合材料 ›› 2018, Vol. 0 ›› Issue (9): 5-10.

• 基础研究 • 下一篇

基于CT纤维增强复合材料三维变形场的测量与分析

毛灵涛¹, 魏凯², 朱子岩³, 刘海洲³

1.煤炭资源与安全开采国家重点实验室,北京100083;
2.北京住总集团有限责任公司,北京100191;
3.中国矿业大学(北京)力学与建筑工程学院,北京100083

收稿日期:2018-02-26 出版日期:2018-09-28 发布日期:2018-09-28
作者简介:毛灵涛(1974-),男,教授,博士,主要从事实验力学方面的研究,mlt@cumtb.edu.cn。
基金资助:
国家自然科学基金(51374211);国家重点研发计划(2016YFC0600705);中央高校基本科研业务费专项资金资助项目(2009QM02)

MEASUREMENT AND ANALYSIS OF 3D DEFORMATION IN GLASS FIBER REINFORCEDCOMPOSITES BY USING COMPUTED TOMOGRAPHY

MAO Ling-tao¹, WEI Kai², ZHU Zi-yan³, LIU Hai-zhou³

1.State Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, China;
2.Beijing Uni.-Construction Group Co., Ltd., Beijing 100191, China;
3.School of Mechanics & Civil Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2018-02-26 Online:2018-09-28 Published:2018-09-28

摘要/Abstract

摘要： 利用工业计算机层析技术(Computed Tomography,简称“CT”)和自制的加载装置,实现了玻璃纤维增强复合材料试件三点弯曲加载过程的原位扫描,获取了不同加载阶段的CT图像。采用数字体图像相关法(Digital Volume Correlation,简称“DVC”)测量分析了试件内部三维位移场和应变场,揭示了试件内部的应变演化特征及破坏机理。纤维增强复合材料内部细观结构特征可以作为变形信息的载体,实验中测量精度为0.063体素(2.8 μm)。DVC获取的位移场及应变场分布能直观反映试件内部的结构特征,由横向切应变的分布显示出在试件破坏前已产生了剪切带,最终导致试件在该区域产生层间开裂。此外,由横截面位移分布验证了因横向切应力而导致截面产生翘曲的现象。结果表明,DVC法与工业CT结合所得测量结果能够直观地反映出复合材料内部结构的变形特征,为研究材料内部变形破坏及验证理论模型提供了新方法。

关键词: 纤维增强复合材料, 工业CT, 三点弯曲实验, 数字体图像相关法, 内部三维应变场

Abstract: A glass fiber reinforced composite specimen was scanned by using industrial Computed Tomography (CT) in situ, and CT images of the specimen under different loading were obtained. The digital volume correlation (DVC) technique was applied to calculating the three-dimensional displacement fields and strain fields in the specimen, and the strain evolution and damage mechanism were revealed. The microstructure of the fiber reinforced composite can be used as the carrier of deformation. The accuracy of the experiment is 0.063 voxels (2.8 μm). The displacement field and strain field distribution obtained by DVC can reflect the internal structural characteristics of the specimen directly. With reference of the distribution of transverse shear strain, the shear band was formed before the specimen was broken, which eventually led to the interface delamination. In addition, the wrapping of the cross section due to the transverse shear was verified by the distribution of its displacement. These results show that the DVC method combined with CT can directly reflect the deformation characteristics of the internal structure of the composite, and provide a new method on studying the internal deformation and the failure of the material.

Key words: glass fiber reinforced composite, industrial CT, three-point bending test, digital volume correlation, internal three dimensional strain field

中图分类号:

TB332

毛灵涛, 魏凯, 朱子岩, 刘海洲. 基于CT纤维增强复合材料三维变形场的测量与分析[J]. 玻璃钢/复合材料, 2018, 0(9): 5-10.

MAO Ling-tao, WEI Kai, ZHU Zi-yan, LIU Hai-zhou. MEASUREMENT AND ANALYSIS OF 3D DEFORMATION IN GLASS FIBER REINFORCEDCOMPOSITES BY USING COMPUTED TOMOGRAPHY[J]. Fiber Reinforced Plastics/Composites, 2018, 0(9): 5-10.

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基于CT纤维增强复合材料三维变形场的测量与分析

MEASUREMENT AND ANALYSIS OF 3D DEFORMATION IN GLASS FIBER REINFORCEDCOMPOSITES BY USING COMPUTED TOMOGRAPHY

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