温度和气氛对二维平面编织SiCf/SiC复合材料断裂韧性及破坏机制的影响:实验与模拟

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Yong Deng  (, ), Yi Hao  (, ), Huanfang Wang  (, ), Weiguo Li  (, ), Qiang Qin  (, ), Bing Pan  (, ), Chao Zhang  (, )
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引用次数: 0

摘要

陶瓷基复合材料具有耐高温、抗氧化等特点,在航空航天领域具有广阔的应用前景。研究了温度和环境气氛对二维平面编织SiCf/SiC复合材料断裂韧性的影响及其破坏机理。结果表明,在不同温度下,它们表现出伪塑性变形行为。室温断裂韧性高达48 MPa m1/2,随温度升高断裂韧性逐渐降低。随着温度的升高,氩气与空气的断裂韧性差异先增大后减小。通过宏观和微观分析,分析了复合材料的高温破坏机理。在此基础上,建立了基于温度的纤维增强陶瓷基复合材料断裂韧性模型,该模型考虑了基体韧性、塑性功率、纤维拔出和残余热应力。实验结果验证了该模型的正确性。利用该模型对影响断裂韧性演化的因素进行了分析。本工作有助于更好地理解陶瓷基复合材料在多场耦合条件下的力学性能演变和破坏机制,从而促进其应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of temperature and atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites: Experiments and modeling

Ceramic matrix composites have broad application prospects in the aerospace field due to their high temperature resistance and oxidation resistance. The effect of temperature and environment atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites was investigated. The results show that they exhibit pseudo-plastic deformation behavior at different temperatures. The fracture toughness is as high as 48 MPa m1/2 at room temperature, and gradually decreases with rising temperature. The difference in fracture toughness between argon and air initially increases and then decreases with rising temperature. Furthermore, the high-temperature failure mechanisms of these composites were analyzed through macro and micro analysis. Based on this, a physic-based temperature-dependent fracture toughness model considering matrix toughness, plastic power, fiber pull-out, and residual thermal stress was developed for fiber-reinforced ceramic matrix composites. The model has been well validated by experimental results. An analysis of influencing factors regarding the evolution of fracture toughness was conducted by the proposed model. This work contributes to a better understanding of the mechanical performance evolution and failure mechanisms of ceramic matrix composites under multi-field coupling conditions, thereby promoting their applications.

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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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