ZrB_2基超高温陶瓷热冲击模拟及失效分析  

Thermal shock simulation and failure analysis of ZrB_2-based ultra-high temperature ceramic

作　　者：王玲玲 张玉霞 王琳 梁军[2] 方国东[2] WANG Lingling;ZHANG Yuxia;WANG Lin;LIANG Jun;FANG Guodong(School of Civil Engineering,Guizhou University,Guiyang 550025,China;Science and Technology on Advanced Composites in Special Environments Key Laboratory,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]贵州大学土木工程学院,贵阳550025 [2]哈尔滨工业大学特种环境复合材料技术国防科技重点实验室,哈尔滨150001

出　　处：《固体火箭技术》2018年第6期766-771,786,共7页Journal of Solid Rocket Technology

基　　金：国家自然科学基金项目(11602061);贵州省科技计划项目([2017]1033;LH[2017]7238;[2018]2816)

摘　　要：ZrB_2基超高温陶瓷作为热防护材料,在应用过程中必然受到热荷载的冲击作用。基于动态热弹性方程,分别对冷却与加热条件下ZrB_2基超高温陶瓷热冲击行为进行数值模拟,并考虑惯性项与耦合项对材料热冲击性能的影响,讨论了表面换热系数对最大应力及临界时间的影响规律。同时采用热断裂理论作为失效准则,提出预测该材料表面换热系数的方法,为ZrB_2基超高温陶瓷的热防护应用提供依据。ZrB2-based ultra-high temperature ceramics,as thermal protection materials,should bear thermal shock load during its service.On the basis of the dynamic thermoelastic equation,thermal shock behavior of ZrB2-based ultra-high temperature ceramic under the cooling and heating condition was simulated,respectively. The influences of inertia item and coupling term on thermal shock resistance were investigated.The effects of surface heat transfer coefficient on the maximum stress and critical time were discussed. Furthermore,the predicted method of surface heat transfer coefficient in ZrB2-based ultra-high temperature ceramic was presented through employing thermal fracture theory as a failure criterion,which can provide the evidence for thermal protection application of ZrB2-based ultra-high temperature ceramics.

关 键 词：ZrB2基超高温陶瓷 热冲击 临界时间 失效准则 

分 类 号：V258[一般工业技术—材料科学与工程]