Fracture Mechanism and Strength Evaluation of Functionally Graded Materials Taking Account of Inhomogeneity and Gradation of Microstructure

考虑微观结构不均匀性和梯度的功能梯度材料的断裂机制和强度评估

• 批准号: 15360050
• 负责人: TOHGO Keiichiro
• 金额: $ 9.41万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360050/
• 关键词: Functionally graded materials; Composite materials; Inhomogeneity; Composite model; Strength evaluation; Fracture toughness test; Fracture test; Fatigue test; 破壊靭性試験

In order to apply ceramic-metal functionally graded materials (FGMs) as heat resistive structural materials, it is important to establish evaluation method of strength taking account of inhomogeneity and gradation of microstructure in FGMs and to make clear their fracture mechanism and strength under mechanical and thermal loading. In this investigation, numerical method for FGMs and test method for small specimens at room temperature to elevated temperature were established, and fracture behavior and strength of ceramic-metal FGMs were examined. Obtained results are summarized as follows.1.A model of two-phase composites is developed based on the micromechanics and concept of matricity for interpenetrating microstructure. By incorporating this model into a finite element method, the numerical method taking account of inhomogeneity and gradation of microstructure in FGMs is established.2.The size of FGMs fabricated by powder metallurgy is about 30mm in diameter and 10mm in thickness. The tests method to evaluate fracture mechanism, fracture toughness and crack growth behavior by small specimens under at room temperature to elevated temperature is established.3.Non-graded composites with deferent composition and FGMs are fabricated by powder metallurgy using partially stabilized zirconia (PSZ) and austenitic stainless steel (SUS 304). Elastic moduli, fracture strength, fracture toughness and crack growth behavior are examined for these materials at room temperature to elevated temperature and influence of inhomogeneity and gradation of microstructure is made clear.From the above results, method to predict the fracture behavior in FGMs and method to evaluate strength of FGMs are suggested based on the micromechanics and fracture mechanics.

为了将陶瓷金属功能分级的材料（FGM）应用于供热结构材料，重要的是要考虑FGMS中的不均匀性和微观结构的不均匀性和渐变热负荷。在这项研究中，建立了在室温到升高温度下的小型标本的数值方法和测试方法，并检查了陶瓷金属FGM的断裂行为和强度。所获得的结果总结如下。1。基于微观力学和用于互穿微结构的疗程概念开发了两相复合材料的模型。通过将该模型纳入有限元方法，可以建立FGM中的不均匀性和微观结构等级的数值方法。2。粉末冶金所制造的FGMS大小的直径约为30mm，厚度为10mm。在室温下，小型标本在室温下至升高的测试方法，用于评估断裂机制，断裂韧性和裂纹生长行为。3。使用偏发的成分和FGM的非级级复合材料，并使用粉末冶金使用部分稳定的氧化锆（PSZ）制造和奥氏体不锈钢（SUS 304）。在室温下检查了这些材料的弹性模量，断裂强度，断裂韧性和裂纹生长行为，以升高温度和不均匀性的影响和微观结构的渐变。从上述结果，可以预测FGMS和方法中的断裂行为的方法根据微观力学和断裂力学，建议评估FGM的强度。

项目成果

Evaluation of Fracture Toughness Distribution in Ceramic-Metal Functionally Graded Materials

• DOI: 10.4028/www.scientific.net/kem.345-346.497
• 发表时间: 2007-08
• 期刊: Key Engineering Materials
• 作者: K. Tohgo;H. Araki;Y. Shimamura

Keiichiro Tohgo: "Two-Phase Composite Model Taking Account of Matricity of Microstructure and Its Application to Functionally Graded Materials"11th US-Japan Conference on Composite Materials. (2004)

Keiichiro Tohgo：“考虑微观结构矩阵的两相复合模型及其在功能梯度材料中的应用”第 11 届美日复合材料会议。

セラミックス-金属系傾斜機能材料の三点曲げ負荷による破壊過程

陶瓷金属功能梯度材料三点弯曲载荷断裂过程

• 发表时间: 2005
• 期刊: 日本機械学会論文集 A編 71巻・701号
• 作者: Keiichiro Tohgo;Keiichiro Tohgo;東郷 敬一郎;Keiichiro Tohgo;東郷敬一郎
• 通讯作者: 東郷敬一郎

Keiichiro Tohgo: "Influence of Material Composition on Mechanical Properties and Fracture Behavior of Ceramic-Metal Composites"Asian Pacific Conference for Fracture and Strength '04. (2004)

Keiichiro Tohgo：“材料成分对陶瓷-金属复合材料机械性能和断裂行为的影响”亚太断裂与强度会议04。

Analysis for Strength of Materials, Form Fundamentals to Strength Evaluation of Composite Materials

材料强度分析，为复合材料强度评价奠定基础

• 发表时间: 2004
• 作者: Keiichiro Tohgo;Keiichiro Tohgo;東郷 敬一郎;Keiichiro Tohgo;東郷敬一郎;Keiichiro Tohgo;Keiichiro Tohgo;Keiichiro Tohgo;東郷敬一郎;東郷 敬一郎;東郷敬一郎;Keiichiro Tohgo;Keiichiro Tohgo;Keiichiro Tohgo;Keiichiro Tohgo;Keiichiro Tohgo;東郷 敬一郎;東郷 敬一郎;東郷敬一郎;東郷 敬一郎;Keiichiro Tohgo;東郷 敬一郎;Keiichiro Tohgo;Keiichiro Tohgo;東郷敬一郎;Keiichiro Tohgo;Keiichiro Tohgo;Keiichiro Tohgo;川口 貴之;Keiichiro Tohgo;Keiichiro Tohgo;Takayuki Kawaguchi;Keiichiro Tohgo;Keiichiro Tohgo;東郷 敬一郎;Keiichiro Tohgo
• 通讯作者: Keiichiro Tohgo