等离子涂层热疲劳失效模式及失效机理研究

被引:15
作者
魏洪亮 [1 ]
杨晓光 [1 ]
齐红宇 [1 ]
韩增祥 [2 ]
机构
[1] 北京航空航天大学能源与动力工程学院
[2] 北京航空材料研究院
关键词
航空、航天推进系统; 热障涂层; 热疲劳; 失效模式; 失效机理;
D O I
10.13224/j.cnki.jasp.2008.02.005
中图分类号
TG174.4 [金属表面防护技术];
学科分类号
080503 ;
摘要
开展了等离子涂层构件热疲劳实验研究,对失效过程及失效模式进行考察,分析了对失效起主导作用的应力分量.针对陶瓷层材料引入粘塑性本构模型,对涂层的热疲劳进行数值模拟研究.分析表明,氧化层厚度为2μm时,陶瓷层波峰位置容易萌生Ⅰ型横向裂纹,界面中部偏上位置容易萌生Ⅱ型横向裂纹;氧化层厚度为8μm时,陶瓷层内部法向应力主导横向裂纹的扩展;不同厚度的氧化层内部将形成较高的应变能密度.给出了等离子涂层内部裂纹形成过程及机理.
引用
收藏
页码:270 / 275
页数:6
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