平纹叠层SiC/SiC复合材料室温和高温拉伸行为与破坏机理

被引：14

作者：

陈明明 ^{[1
]}

陈秀华 ^{[2
]}

张大旭 ^{[1
]}

伍海辉 ^{[3
]}

郭洪宝 ^{[3
]}

龚景海 ^{[1
]}

机构：

[1] 上海交通大学船舶海洋与建筑工程学院

[2] 上海交通大学航空航天学院

[3] 中国航发商用航空发动机有限责任公司

来源：

上海交通大学学报 | 2019年 / 01期

基金：

高等学校博士学科点专项科研基金;

关键词：

复合材料; 陶瓷基; 力学行为; 损伤; 高温; 破坏机理;

D O I：

10.16183/j.cnki.jsjtu.2019.01.002

中图分类号：

TB33 [复合材料];

学科分类号：

0805 ; 080502 ;

摘要：

通过单向拉伸试验,对比研究平纹叠层SiC/SiC复合材料在室温和高温(1 200℃)环境下的宏观力学特性,并采用扫描电镜对试验件断口进行观测,以分析其微观损伤模式和破坏机理.结果表明:平纹叠层SiC/SiC复合材料的室温和高温拉伸应力-应变行为均表现为非线性特征,具有较高的轴向拉伸基体开裂应力;两者拉伸强度相差不大,但高温下的断裂应变比室温下的高.从宏观断口分析可知,两者均呈现韧性断裂,但纤维拔出长度和断口平齐程度有所不同.材料内部产生的基体裂纹大部分与加载方向垂直;断面上经向纤维束发生纵向拉伸断裂破坏,内部存在严重的界面脱粘损伤以及纬向纤维束发生轴向劈裂破坏是材料在室温和高温下的拉伸破坏机理.高温下由于纤维与基体间的界面层在一定程度上被高温氧化而退化失效,使界面结合变弱和界面滑移力降低,从而产生较长的纤维拔出长度,所以高温下材料具有较高的断裂韧性.

引用

页码：11 / 18

页数：8

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