In situ X-ray imaging and numerical modeling of damage accumulation in C/SiC composites at temperatures up to 1200 ℃

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外文摘要：Carbon fiber reinforced silicon carbide matrix composites(C/SiC)have emerged as key materials for ther-mal protection systems owing to their high strength-to-weight ratio,high-temperature durability,resis-tance to oxidation,and outstanding reliability.However,manufacturing defects deteriorate the mechani-cal response of these composites under extreme thermal-force coupling conditions,prompting significant research attention.This study demonstrates a customized in situ loading device compatible with syn-chrotron radiation facilities,enabling high spatial and temporal resolution recording of internal material damage evolution and failure behavior under thermal-force coupling conditions.Infrared thermal radia-tion units in a confocal configuration were used to create ultra-high-temperature environments,offering advantages of compactness,rapid heating,and versatility.In situ tensile tests were conducted on C/SiC samples in a nitrogen atmosphere at both room temperature and 1200 ℃.The high-resolution image data demonstrate various failure phenomena,such as matrix cracking and pore linkage.Image-based fi-nite element simulations indicate that the temperature-dependent variation of the failure mechanism is attributable to thermal residual stresses and defect-induced stress concentrations.This work seamlessly integrates extreme mechanical testing methods with in situ observation techniques,providing a compre-hensive solution for accurately quantifying crack initiation,pore connection,and failure behavior of C/SiC composites.

外文关键词：

Ceramic matrix compositesExtreme environmentsX-ray computed tomographyInternal damage evolutionImage-based finite element method

作者：

Weijian Qian、Wanen Zhang、Shengchuan Wu、Yue Hu、Xiangyu Zhang、Qiaodan Hu、Shaoming Dong、Shantung Tu

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作者单位：

State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China

State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China

School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China

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基金：

National Natural Science Foundation of ChinaScience and Technology Innovation Plan of Shanghai Science and Technology Commission

项目编号：

5232540721511104800

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.069

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.197(30)