基于DIC研究应力比对T700碳纤维复合材料疲劳性能的影响

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (11): 54-60.

基于DIC研究应力比对T700碳纤维复合材料疲劳性能的影响

王付胜, 欧阳俊杰, 孔繁淇, 邸则坤

中国民航大学中欧航空工程师学院,天津300300

收稿日期:2020-03-16 出版日期:2020-11-28 发布日期:2020-11-28
作者简介:王付胜(1987-),男,硕士,实验师,研究方向为航空材料力学性能测试及失效分析,fswang@cauc.edu.cn。本文作者还有陈亚军。
基金资助:
中央高校基本科研业务费项目中国民航大学专项资助(3122018Z003)

EFFECT OF STRESS RATIO ON FATIGUE PROPERTIES OF T700 CARBON FIBER COMPOSITES BASED ON DIC

WANG Fu-sheng, OUYANG Jun-jie, KONG Fan-qi, DI Ze-kun

Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China

Received:2020-03-16 Online:2020-11-28 Published:2020-11-28

摘要/Abstract

摘要： 在不同应力比的疲劳周期载荷下,利用数字图像相关技术(DIC)探究碳纤维层合板损伤模式及过程。使用Instron8803电液伺服疲劳机对复合材料层合板进行疲劳试验,使用DIC技术对损伤过程进行信息采集,结合微观失效形貌,分析复合材料疲劳失效模式。拉-拉疲劳载荷作用下,应力比对复合材料层合板的疲劳寿命有较大影响,应力比越小,疲劳寿命越短。应力比从0.6降至0,试样疲劳寿命从6×10⁵降低至6×10³。利用DIC技术分析层合板在厚度(Z)方向上的分层损伤情况,得到试样表面的宽度(Y)方向应变云图。比较疲劳失效与准静态拉伸失效微观形貌,发现疲劳失效有明显的分层损伤,层与层之间的树脂基失效,层内纤维拔出。

关键词: 碳纤维复合材料, 数字图像相关技术, 应力比, 拉-拉疲劳, 微观损伤形貌

Abstract: Under fatigue cycle loads with different stress ratios, digital image correlation (DIC) is used to investigate the damage modes and processes of carbon fiber laminates. Using Instron8803 electro-hydraulic servo fatigue machine to perform fatigue tests on composite laminates, and DIC technology to collect information during the damage process, combined with micro failure morphology, the fatigue failure modes of composite materials were analyzed. The fatigue life of composite laminate was affected by the stress ratio under the condition of tensile-tension fatigue loading. The smaller the stress ratio, the shorter the fatigue life, and the fatigue life of the sample decreased from 6×10⁵ to 6×10³ when the stress ratio decreased from 0.6 to 0. The DIC technique was used to analyze the layered damage of the laminate in the thickness (Z) direction, and a width (Y) strain contour was obtained. Comparing the micro-morphology of fatigue failure and tensile failure, it was found that the delamination damage appeared on the fatigue fracture obviously, the resin matrix between layers failed, and the fiber in the layer was pulled out.

Key words: CFPR, digital image correlation, stress ratio, tension-tension fatigue, micro-morphology

中图分类号:

TB332

王付胜, 欧阳俊杰, 孔繁淇, 邸则坤. 基于DIC研究应力比对T700碳纤维复合材料疲劳性能的影响[J]. 复合材料科学与工程, 2020, 0(11): 54-60.

WANG Fu-sheng, OUYANG Jun-jie, KONG Fan-qi, DI Ze-kun. EFFECT OF STRESS RATIO ON FATIGUE PROPERTIES OF T700 CARBON FIBER COMPOSITES BASED ON DIC[J]. Composites Science and Engineering, 2020, 0(11): 54-60.

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