A Quantitative Representation of Damage and Failure Response of 3D Textile SiC/SiC Ceramics Matrix Composites Subjected to Flexural Loading

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Zhengmao Yang, Keji Pang, X. Lei, Qing Hu
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引用次数: 0

Abstract

In the present work, the microstructure deformation and synergetic damage evolution of a three-dimensional textile SiC/SiC ceramic-matrix composites under flexural loading, has been investigated by in situ digital image correlation at ambient temperatures. With the flexural loading increases, matrix cracking occurs on the tensile side initially, and the local stress concentration leads to matrix cracking, interlayer debonding and fiber breakage on the compressive side of materials. Different from traditional 2D braided composite, when matrix fracture occurs, a matrix crack propagates in matrix enrichment regions perpendicular to fiber tows, with local deflection near the fiber/matrix interface surfaces, its propagation is diffused into sinuous fractures, and finally present a H-shaped path feature. This processes dissipate strain energy, resulting in enhancing composites fracture toughness. By using continuum damage mechanics and thermodynamic framework with synergetic effects of microstructure, asymmetric tension and compression load on both sides of the material, the flexural loading-induced damage is characterized by the reduction of the macroscopic effective elastic modulus, and a synergetic damage evolution model is established, which reveals the relationship between energy release rate and elastic modulus degradation, and can be used to predict the flexural stress-strain curves of the 3D textile SiC/SiC composites, further to improve the design and assessment of new textile architecture with specific mechanical properties.
三维纺织SiC/SiC陶瓷基复合材料在弯曲载荷作用下损伤和失效响应的定量表征
本文采用原位数字图像相关技术,研究了三维纺织SiC/SiC陶瓷基复合材料在室温弯曲载荷作用下的微观结构变形和协同损伤演化。随着弯曲载荷的增大,拉伸侧首先发生基体开裂,局部应力集中导致材料压缩侧基体开裂、层间剥离和纤维断裂。与传统二维编织复合材料不同的是,当基体发生断裂时,基体裂纹在垂直于纤维束的基体富集区扩展,在纤维/基体界面附近发生局部挠曲,其扩展扩散成弯曲裂缝,最终呈现h型路径特征。这一过程耗散了应变能,提高了复合材料的断裂韧性。采用微观结构与材料两侧非对称拉压载荷协同作用的连续损伤力学和热力学框架,分析了材料受弯曲载荷损伤的宏观有效弹性模量降低特征,建立了材料受弯曲载荷损伤的协同演化模型,揭示了能量释放率与弹性模量退化之间的关系。并可用于预测三维纺织SiC/SiC复合材料的弯曲应力应变曲线,进一步改进具有特定力学性能的新型纺织结构的设计和评估。
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
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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