High-speed infrared imaging and mesostructural analysis of localized temperature rise in damage and failure behavior of 3-D braided carbon/epoxy composite subjected to high strain-rate compression

被引：23

作者：

Pan, Zhongxiang ^{[1
,2
]}

Wu, Zhenyu ^{[3
]}

Xiong, Jie ^{[1
]}

机构：

[1] Zhejiang Sci Tech Univ, Coll Mat & Text, Hangzhou 310018, Peoples R China

[2] Donghua Univ, Minist Educ, Key Lab Text Sci & Technol, Shanghai 201620, Peoples R China

[3] Zhejiang Sci Tech Univ, Fac Mech Engn & Automat, Hangzhou 310018, Peoples R China

来源：

POLYMER TESTING | 2019年 / 80卷

基金：

中国国家自然科学基金;

关键词：

Braided composite; High strain-rate compression; Adiabatic temperature rise; Thermomechanical failure; NONDESTRUCTIVE EVALUATION; HEAT-GENERATION; IMPACT; DEFORMATION; MODEL;

D O I：

10.1016/j.polymertesting.2019.106151

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This investigation is aimed to study the dynamic failure behavior of 3-D braided carbon/epoxy composite by capturing the high-speed infrared image and simulating the temperature-rise response under high strain-rate compression. It is found that localized temperature rise is a good indication in damage and failure of the 3-D braided composite. Localized temperature can rise above a hundred degrees Celsius, reaching or even exceeding the T-g of the matrix resin and imperiling the polymer along damage regions in specimen. Temperature rise in localized paths of the specimens was caused by adiabatic shear along the boundaries of braided fibers or inside the fiber bundles. Sustaining decrease in stress after the peak strength is related to shear deformation, temperature rise and progressive damage. There is a correlation among localization of temperature rise, adiabatic shear band, resin softening, damages and failures in the 3-D braided carbon/epoxy composite under dynamic compression loading. For the out-of-plane compression, temperature always conducts from the broken interface to the inside of the fiber bundles along the radial, which will lead to the weakening of resin in fiber bundles. And damages, penetrating cracks and openings are verified with 'X'-shape localization of temperature rise. With the increase of strain rate, localization of temperature rise indicates that adiabatic shear bands begin to connect together to form larger and longer paths by the mutual shear effect among adjacent fiber bundles. For the in-plane compression, multi-cracks are found by observing the independent 'zigzag' shear bands converting to dependent 'zigzag' network. The temperature is easily localized at the crimp position of fiber bundle when they forming the 'zigzag' localization along the braiding paths of fiber bundles. However, some regions in 3-D braided carbon/epoxy composite have not experienced plastic shear deformation, which are isolated among 'zigzag' adiabatic shear network and their boundaries are the very paths for localized temperature rise.

引用

页数：20