针刺C/SiC复合材料拉-压疲劳特性与失效机理

doi:10.11868/j.issn.1001-4381.2016.11.013

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摘要

研究了室温下针刺C/SiC复合材料的拉-压疲劳特性，并与其拉-拉疲劳特性进行了对比。结果表明：针刺C/SiC复合材料的拉-压疲劳强度略低于拉-拉疲劳强度；两种循环载荷下都存在迟滞现象，随着循环数的增大迟滞环不断右移，且偏斜程度和包围面积不断增大。采用扫描电子显微镜对失效试件的断口形貌和微观结构的观察表明：除了垂直于加载方向的基体开裂以及界面脱粘，拉-压循环加载下的细观失效机制还包括平行于加载方向的基体开裂以及层间的开裂。这些平行于加载方向的损伤使得纤维受力状态恶化，最终削弱了针刺C/SiC复合材料拉-压疲劳强度。

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	方光武
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关键词 ：针刺C/SiC复合材料, 拉-压疲劳, 断口形貌, 细观机理

Abstract：

The tension-compression fatigue behavior for needled C/SiC composite at room temperature was studied and compared with the properties under tension-tension fatigue loading. The results show that the tension-compression fatigue strength of the needled C/SiC composites is slightly lower than that under tension-tension loading. Hysteresis phenomenon can be observed under both loading stations. The loops move to the right and their slopes and areas increase as the cycles increase. The microstructure of the composites and the morphology of the fractured surfaces of the failure specimens can be observed by SEM. It shows that in addition to the matrix cracking and interface debonding, which is vertical to the loading direction, the meso failure mechanism under tension-compression cyclic loading also includes matrix cracking and interlayer delamination parallel to loading direction, which can make the stress state within fibers worse and finally weakens the fatigue strength of needled C/SiC composites under tension-compression loading.

Key words： needled C/SiC composite tension-compression fatigue fracture morphology microstructural mechanism

收稿日期: 2015-07-20 出版日期: 2016-11-22

中图分类号:

TB332

基金资助:国家自然科学基金(51575261);航空科学基金(2012ZB52027);南京航空航天大学校博士学位论文创新与创优基金(BCXJ14-02)

通讯作者: 宋迎东 E-mail: ydsong@nuaa.edu.cn

作者简介: 宋迎东(1969-), 男, 教授, 博导, 主要研究方向包括:航空发动机结构强度设计与分析; 航空发动机结构疲劳与断裂; 先进复合材料结构设计等, 联系地址:江苏省南京市秦淮区御道街29号南京航空航天大学能源与动力学院(210016), E-mail:ydsong@nuaa.edu.cn

引用本文:

方光武, 高希光, 宋迎东. 针刺C/SiC复合材料拉-压疲劳特性与失效机理[J]. 材料工程, 2016, 44(11): 78-82.
Guang-wu FANG, Xi-guang GAO, Ying-dong SONG. Tension-compression Fatigue Behavior and Failure Mechanism of Needled C/SiC Composite. Journal of Materials Engineering, 2016, 44(11): 78-82.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.11.013 或 http://jme.biam.ac.cn/CN/Y2016/V44/I11/78

Fig.1 针刺C/SiC复合材料细观结构

Fig.2 力学性能测试试件形状及尺寸

Table 1 针刺C/SiC复合材料试件疲劳实验测试条件

Fig.3 针刺C/SiC复合材料静拉伸应力-应变曲线

Fig.4 针刺C/SiC复合材料疲劳迟滞回线(a)拉-拉疲劳；(b)拉-压疲劳

Fig.5 针刺C/SiC复合材料拉-拉和拉-压疲劳S-N曲线

Fig.6 针刺C/SiC复合材料试件失效断口形貌(a)拉-拉疲劳；(b)拉-压疲劳

Fig.7 针刺C/SiC复合材料拉-压疲劳失效试件断口细观结构特征SEM照片(a)界面脱粘；(b)层间裂纹

Fig.8 针刺C/SiC复合材料疲劳失效机理示意图

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