摘要
针对热障涂层,利用数字图像处理技术与有限元网格模型生成原理相结合的方法,生成与实际ZrO2陶瓷层显微组织图片一致的介观尺度的有限元网格模型.利用LS-DYNA有限元方法进行ZrO2陶瓷层在不同拉应力作用下的裂纹扩展模拟.数值模拟结果表明:在考虑了ZrO2陶瓷层所包含的孔洞、微裂纹等缺陷的基础上,裂纹从已有缺陷处开始迅速扩展,并最终导致ZrO2陶瓷层断裂失效.数值模拟结果与实验结果吻合良好.
Based on digital image processing theory and finite element mesh generation principle,a methodology to generate the finite element grid model according to the microstructural image of ZrO2 ceramic coatings is proposed to study thermal barrier coatings.LS-DYNA finite element method is employed to model the crack growth of ZrO2 ceramic coatings under different tensile stresses.Numerical simulation results showed that based on the true microstructure of ZrO2 ceramic coatings including defects of voids and micro-cracks,crack grows quickly from the existing defects,leading to the failure of ZrO2 ceramic coatings.Numerical simulation results agree well with the experimental phenomena.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第2期231-234,共4页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(50801005)
关键词
数字图像处理
有限元网格模型
拉应力
裂纹扩展
digital image processing
finite element grid model
tensile stresses
crack growth
