Mesomechanics of nucleation and propagation of small fatigue cracks in metal matrix composites

金属基复合材料中细小疲劳裂纹的形核和扩展的细观力学

• 批准号: 09450047
• 负责人: TANAKA Keisuke
• 金额: $ 6.98万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450047/
• 关键词: Metal matrix Composite; Fatigue; Crack propagation; Fracture mechanics; Residual stress; Mesomechanics; Crack closure; Small crack; き裂伝ば

1. A new system for the fatigue tests of metal matrix composites in a scanning electron microscope was developed to conduct in-situ observation of initiation and propagation of small fatigue cracks.2. The stress intensity factor for a crack interacting with particles was determined by the finite element method, and used for the prediction of the crack propagation direction and the rate.3. The threshold condition of small fatigue crack propagation was given by the emission of a dislocation from the crack tip or the dislocation annihilation. The propagation behavior of a microstructurally small crack interacting with the grain boundaries was modeled on the basis of continuously distributed dislocation theory combined with the crack closure model. The propagation condition of mechanically small cracks was given by the resistance curve method.4. The published data on the fatigue limit, the threshold stress intensity factor and the effective threshold stress intensity factor of aluminum alloys reinforced and unreinforced by silicon carbide particles or whiskers were correlated to the tensile properties of materials. The reinforcement influenced the tensile strength and also the fatigue properties of materials.

1。开发了一种用于扫描电子显微镜中金属基质复合材料疲劳测试的新系统，以对小疲劳裂纹的起始和传播进行原位观察。2。裂纹与颗粒相互作用的应力强度因子由有限元方法确定，并用于预测裂纹传播方向和速率3。小疲劳裂纹传播的阈值条件是通过从裂纹尖端或脱位歼灭中排出的脱位来给出的。与晶界相互作用的微结构小裂纹的传播行为是基于连续分布的错位理论与裂纹闭合模型结合的。机械裂纹的传播条件是通过电阻曲线方法给出的。4。公开的有关疲劳极限，阈值应力强度因子以及铝合金的有效阈值应力强度因子加强和未经碳化硅颗粒或晶须的增强的数据与材料的拉伸性质相关。加固影响了拉伸强度以及材料的疲劳特性。

项目成果

Y. Akiniwa: "Propagation Behavior of Small Fatigue Cracks in SiCp/Al204 Composites"Proc. Int. Conf. Materials and Mechanics '97 ICM&M'97. 661-666 (1997)

Y. Akiniwa：“SiCp/Al204 复合材料中小疲劳裂纹的扩展行为”Proc。

K.Tanaka: "Mechanics of Small Fatigue Crack Propagation"Small Fatigue Cracks,Elsevier Science Ltd.. 59-71 (1999)

K.Tanaka：“小疲劳裂纹传播的力学”小疲劳裂纹，Elsevier Science Ltd.. 59-71 (1999)

Yoshiaki Akiniwa: "Propagation Behavior of Small Fatigue Cracks Interacting with Particles in MMC" The 3rd inter.Symp.Microstructure Mech.Prop.Engng Materials.67-67 (1997)

Yoshiaki Akiniwa：“MMC 中与颗粒相互作用的小疲劳裂纹的传播行为”第 3 届 inter.Symp.Microstruct Mech.Prop.Engng Materials.67-67 (1997)

Keisuke Tanaka: "Mechanics of Small Fatigue Crack Propagation" Proc.Inter.Conf.Small Fatigue Cracks. (発表予定). (1998)

Keisuke Tanaka：“小疲劳裂纹传播的力学”Proc.Inter.Conf.Small Fatigue Cracks（即将发表）。

田中啓介: "炭化ケイ素で強化したアルミニウム合金の疲労限度"日本材料学会,第10回破壊 力学シンポジウム講演論文集. 1-5 (1999)

Keisuke Tanaka：“碳化硅强化铝合金的疲劳极限”第10届断裂力学研讨会论文集，日本材料学会，1-5（1999）