Finite element analysis of crack propagation and fracture mechanical properties of freestanding 8 wt.% Y2O3-ZrO2 coatings
Finite element analysis of crack propagation and fracture mechanical properties of freestanding 8 wt.% Y2O3-ZrO2 coatings
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DOI：
10.1016/j.surfcoat.2013.02.034
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发表时间：
2013-05
影响因子：
5.4
通讯作者：
Xiukang Yang;J. Wan;C. Dai;Yuanyuan Zhang;W. Mao;Yichun Zhou;Chunsheng Lu
中科院分区：
文献类型：
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作者：
Xiukang Yang;J. Wan;C. Dai;Yuanyuan Zhang;W. Mao;Yichun Zhou;Chunsheng Lu
利用数字图像相关技术，对8wt悬空体的断裂强度和断裂韧性进行了分析。采用单边缺口弯曲（SENB）试验直接测定了Y2O3-ZrO2 （8YSZ）涂层的含量。建立了扩展有限元模型（XFEM）来模拟8YSZ带缺口试样的断裂过程。其能量释放率由已知断裂强度和杨氏模量估算。在线弹性脆性断裂中，将计算得到的能量释放率转化为相应的断裂韧性，与SENB实验结果吻合较好。本文所获得的材料特性对预测未来异形结构的可靠性和耐久性具有重要意义。
With the help of a digital image correlation technique, fracture strength and fracture toughness of freestanding 8wt.% Y2O3–ZrO2(8YSZ) coatings were directly measured by single edge notched bending (SENB) tests. An extended finite element model (XFEM) was established to simulate the fracture process of notched 8YSZ samples. Its energy release rate was estimated by the known fracture strength and Young's modulus. Within the linear elastic brittle fracture, the calculated energy release rate was transformed into the corresponding fracture toughness, which is in good agreement with the experimental results by SENB. The obtained material properties of XFEM in this work would play a crucial role in predicting the reliability and durability of TBCs with irregular geometry in the future.