In-situ and real-time tests on the damage evolution and fracture of thermal barrier coatings under tension: A coupled acoustic emission and digital image correlation method

被引：42

作者：

Zhou, M. ^{[1
,2
]}

Yao, W. B. ^{[1
,2
]}

Yang, X. S. ^{[1
,2
]}

Peng, Z. B. ^{[1
,2
]}

Li, K. K. ^{[1
,2
]}

Dai, C. Y. ^{[1
,2
]}

Mao, W. G. ^{[1
,2
,3
]}

Zhou, Y. C. ^{[1
,2
]}

Lu, C. ^{[4
]}

机构：

[1] Xiangtan Univ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China

[2] Xiangtan Univ, Minist Educ, Key Lab Low Dimens Mat & Applicat Technol, Xiangtan 411105, Hunan, Peoples R China

[3] Nanchang Hangkong Univ, Aeronaut Sci & Technol Key Lab Aeronaut Test & Ev, Nanchang 330063, Jiangxi, Peoples R China

[4] Curtin Univ, Dept Mech Engn, Perth, WA 6845, Australia

来源：

SURFACE & COATINGS TECHNOLOGY | 2014年 / 240卷

基金：

中国国家自然科学基金;

关键词：

Thermal barrier coating; Damage evolution; Acoustic emission; Digital image correlation; AE-b value; STRAIN EVOLUTION; STRESS; DELAMINATION; BEHAVIOR; FAILURE; RUPTURE; LAYER;

D O I：

10.1016/j.surfcoat.2013.12.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

By using a coupled acoustic emission (AE) and digital image correlation (DIC) technique, the failure behavior of air plasma sprayed thermal barrier coatings (TBCs) was investigated. The in-situ DIC observations show that the characteristics of AE signals, extracted from the fast Fourier transform, are closely related to the failure modes of a TBC system, which was applied to real-time reveal its damage evolution during tension. It is shown that there is a typical power-law relationship between the vertical crack density in coating and strain in substrate. A damage variable defined as a function of the cumulative AE events can be used to characterize the different fracture stages of a TBC system. With the increase of strain in substrate, the AE-b value estimated by the Gutenberg-Richter law varies from 2.0 at the initial regime to a plateau value of 12. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：40 / 47

页数：8

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