氧化诱导自修复陶瓷中裂纹扩展、裂隙填充和机械性能恢复行为的有限元分析

IF 3.4 3区 工程技术 Q1 MECHANICS
Mostafizur Rahman , Taiyo Maeda , Toshio Osada , Shingo Ozaki
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引用次数: 0

摘要

氧化引起的裂纹自愈合是陶瓷在要求高可靠性的高温结构部件中应用的一项极具吸引力的功能。为了进一步优化材料或部件的实际应用,数值模拟技术的发展具有重要意义。在本研究中,我们采用有限元分析(FEA)方法,结合基于断裂力学和氧化动力学的损伤愈合构成模型,研究了在不同载荷和温度条件下,楔形缺口试样的裂纹生长、氧化物填充裂纹间隙和再开裂行为。此外,通过将已报道的自愈合陶瓷复合材料的机械性能和氧化动力学参数应用到有限元分析中,我们研究了成分和复合材料结构对开裂和愈合行为的影响。裂缝间隙填充模拟表明,损伤变量从裂缝尖端逐渐减小,最小愈合时间由裂缝开口宽度最大的裂缝口元素完全填充所需的时间决定。此外,在合理的愈合温度和时间下,完全愈合后的刚度和强度恢复也能成功再现。所提出的有限元分析方法还有助于估算各种复合材料在不同温度下愈合特定损伤所需的最短愈合时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Finite element analysis of crack propagation, crack-gap-filling, and recovery behavior of mechanical properties in oxidation-induced self-healing ceramics
The oxidation-induced self-healing of cracks is an attractive function for the application of ceramics in high-temperature structural components requiring high reliability. To further optimize materials or components for practical applications, the development of numerical simulation techniques is of importance. In this study, we examined crack growth, crack-gap-filling by oxide, and re-cracking behaviors in chevron-notched specimens under various load and temperature conditions by adopting a finite element analysis (FEA) approach incorporating a damage-healing constitutive model based on fracture mechanics and oxidation kinetics. Furthermore, by implementing the mechanical properties and oxidation kinetic parameters of reported self-healing ceramics composites into the FEA, we examined the effects of the composition and composite structure on the cracking and healing behaviors. Crack-gap-filling simulations suggested that the damage variables gradually decreased from the crack tip, and the minimum healing time was determined by the time required for the complete filling of the element at the crack mouth with the largest crack opening width. Furthermore, the recovery of the stiffness and strength could be successfully reproduced after complete healing with a reasonable healing temperature and time. The proposed FEA approach could also contribute to estimating the minimum healing time required at various temperatures to heal a given damage for various composites.
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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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