In-Situ Characterization on Fracture Toughness of Thermal Barrier Coatings Under Tension by J-Integral with Digital Image Correlation at High Temperatures

IF 2 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Experimental Mechanics Pub Date : 2024-04-03 DOI:10.1007/s11340-024-01061-1

H. Bai, Z. Qu, H. Yang, D. Fang

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Abstract

Background

The elastic–plastic fracture toughness (J_c) is an important mechanical parameter for studying the failure behavior of air plasma-sprayed (APS) thermal barrier coatings (TBC) at high temperatures.

Objective

This study aims to: (1) develop an effective test method to characterize the J_c of TBC at high temperatures; (2) acquire accurate J_c data for TBC at high temperatures; (3) analyze the influence of plasticity of top-coat on the J_c characterization.

Methods

The elastic–plastic Ramberg–Osgood equation of the ceramic top-coat and the deformation fields of single edge notched tension (SENT) specimens were measured by high-temperature in-situ tension with digital image correlation (DIC) system. The J_c of TBC was calculated by the numerical J-integral with DIC-measured (DIC-J) deformation fields by adopting Ramberg–Osgood equation of the top-coat. The finite element analysis (FEA) method was adopted to analyze the influence of plasticity of top-coat on the J_c characterization.

Results

The curves of J_c varying with crack propagation length (Δa) of TBC were obtained and were expressed as J_R = 24.47 × [ 1 + 1.0446 × (\(\widetilde{\Delta a}\))^0.7624] J/m² and J_R = 16.52 × [ 1 + 1.4806 × (\(\widetilde{\Delta a}\))^0.6742] J/m² at 800 and 1000 ℃, respectively.

Conclusions

A high-temperature in-situ tensile test of SENT specimens combined with the DIC-J method was developed to characterize J_c of TBC. The J_c of TBC displays a rising resistance curve behavior, and FEA results indicated that J_c would be underestimated without considering the plasticity of the top-coat at 800 and 1000 ℃.

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利用 J-Integral 和数字图像相关性对高温下隔热涂层在拉伸状态下的断裂韧性进行原位表征

摘要背景弹塑性断裂韧性（Jc）是研究高温下空气等离子喷涂（APS）隔热涂层（TBC）失效行为的重要力学参数。本研究旨在：（1）开发一种有效的测试方法来表征高温下 TBC 的断裂韧性；（2）获取高温下 TBC 的精确断裂韧性数据；（3）分析面层塑性对断裂韧性表征的影响。方法利用数字图像相关（DIC）系统，通过高温原位拉伸测量陶瓷表层的弹塑性 Ramberg-Osgood 方程和单边缺口拉伸（SENT）试样的变形场。采用表层的 Ramberg-Osgood 方程，通过数值 J 积分与 DIC 测量的变形场（DIC-J）计算出 TBC 的 Jc。采用有限元分析（FEA）方法分析了面层塑性对 Jc 特性的影响。结果得到了 Jc 随 TBC 裂纹扩展长度 (Δa) 变化的曲线，在 800 和 1000 ℃ 时分别为 JR = 24.47 × [ 1 + 1.0446 × ( \(\widetilde{\Delta a}\) )0.7624] J/m2 和 JR = 16.52 × [ 1 + 1.4806 × ( \(\widetilde{\Delta a}\) )0.6742] J/m2。结论开发了一种结合 DIC-J 方法的 SENT 试样高温原位拉伸试验来表征 TBC 的 Jc。TBC 的 Jc 呈上升阻力曲线行为，有限元分析结果表明，如果不考虑表层涂层在 800 和 1000 ℃ 时的塑性，Jc 会被低估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.