A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings

doi:10.1007/s10483-023-3001-6

Applied Mathematics and Mechanics (English Edition) ›› 2023, Vol. 44 ›› Issue (5): 693-710.doi: https://doi.org/10.1007/s10483-023-3001-6

• 论文 • 下一篇

A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings

Haoran BAI, Zhanyu WANG, Sangyu LUO, Zhaoliang QU, Daining FANG

Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

收稿日期:2023-03-23 修回日期:2023-04-04 出版日期:2023-05-01 发布日期:2023-04-24
通讯作者: Zhaoliang QU, E-mail: quzl@bit.edu.cn
基金资助:
the National Natural Science Foundation of China (Nos.12172048 and 12027901) and the National Science and Technology Major Project of China (Nos.2019-VII-0007-0147 and 2017-VI-0020-0093)

A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings

Haoran BAI, Zhanyu WANG, Sangyu LUO, Zhaoliang QU, Daining FANG

Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

Received:2023-03-23 Revised:2023-04-04 Online:2023-05-01 Published:2023-04-24
Contact: Zhaoliang QU, E-mail: quzl@bit.edu.cn
Supported by:
the National Natural Science Foundation of China (Nos.12172048 and 12027901) and the National Science and Technology Major Project of China (Nos.2019-VII-0007-0147 and 2017-VI-0020-0093)

摘要/Abstract

摘要： The surface fracture toughness is an important mechanical parameter for studying the failure behavior of air plasma sprayed (APS) thermal barrier coatings (TBCs). As APS TBCs are typical multilayer porous ceramic materials, the direct applications of the traditional single edge notched beam (SENB) method that ignores those typical structural characters may cause errors. To measure the surface fracture toughness more accurately, the effects of multilayer and porous characters on the fracture toughness of APS TBCs should be considered. In this paper, a modified single edge V-notched beam (MSEVNB) method with typical structural characters is developed. According to the finite element analysis (FEA), the geometry factor of the multilayer structure is recalculated. Owing to the narrower V-notches, a more accurate critical fracture stress is obtained. Based on the Griffith energy balance, the reduction of the crack surface caused by micro-defects is corrected. The MSEVNB method can measure the surface fracture toughness more accurately than the SENB method.

关键词: thermal barrier coating (TBC), surface fracture toughness, modified single edge V-notched beam (MSEVNB) method, multilayer structure, micro-defect

Abstract: The surface fracture toughness is an important mechanical parameter for studying the failure behavior of air plasma sprayed (APS) thermal barrier coatings (TBCs). As APS TBCs are typical multilayer porous ceramic materials, the direct applications of the traditional single edge notched beam (SENB) method that ignores those typical structural characters may cause errors. To measure the surface fracture toughness more accurately, the effects of multilayer and porous characters on the fracture toughness of APS TBCs should be considered. In this paper, a modified single edge V-notched beam (MSEVNB) method with typical structural characters is developed. According to the finite element analysis (FEA), the geometry factor of the multilayer structure is recalculated. Owing to the narrower V-notches, a more accurate critical fracture stress is obtained. Based on the Griffith energy balance, the reduction of the crack surface caused by micro-defects is corrected. The MSEVNB method can measure the surface fracture toughness more accurately than the SENB method.

Key words: thermal barrier coating (TBC), surface fracture toughness, modified single edge V-notched beam (MSEVNB) method, multilayer structure, micro-defect

中图分类号:

74B05
74R10

Haoran BAI, Zhanyu WANG, Sangyu LUO, Zhaoliang QU, Daining FANG. A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings[J]. Applied Mathematics and Mechanics (English Edition), 2023, 44(5): 693-710.

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A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings

A modified single edge V-notched beam method for evaluating surface fracture toughness of thermal barrier coatings

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