Analyses on Damage and Deformation in Notched Component under Multiaxial Low Cycle Fatigue

缺口构件多轴低周疲劳损伤与变形分析

• 批准号: 62460075
• 负责人: INOUE Tatsuo
• 金额: $ 5.06万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62460075/
• 关键词: Notched Component; Low Cycle Fatigue; Multiaxial Stress; Finite Element Analysis; Damage Mechanics; Fracture Mechanics; Crack Initiation; き裂伝ぱ

An elastic-plastic finite element procedure was developed to analyze stress/strain at notch root of specimen subjceted to combined tension and torsion loadings. The applicability of the developed procedure was examined in the comparison with experimental observation.Fatigue tests were conducted under in-phase axial-torsional loadings in load-controlled condition. Tested materials were pure copper and medium-carbon steel. Cracking behavior was observed by using a plastic replication technique. The results indicated that the fatigue life and cracking morphology was dependent on the material microstructure and/or stress multiaxiality.Two analytical procedures were investigated to explain the difference in life and cracking mentioned above, One of the procedures was based on a damage mechanics approach. The analytical result obtained using the procedure showed a good correspondence with the crack distribution depending on the stress multiaxiality. The other procedure was based on modeling of both processes of crack initiation and propagation, simultaneously. It was found from the simulated results that the proposed procedure was effective for describing the fatigue life and cracking morphology depending on the microstructure and multiaxial stress state.

本文建立了一个弹塑性有限元程序，分析了拉扭复合载荷作用下缺口根部的应力应变。通过与试验结果的比较，验证了该方法的适用性。在载荷控制条件下，进行了轴向-扭转同相载荷下的疲劳试验。试验材料为纯铜和中碳钢。通过使用塑性复制技术观察开裂行为。结果表明，疲劳寿命和裂纹形态与材料的微观结构和应力多轴性有关，本文提出了两种分析方法，其中一种是基于损伤力学的分析方法。用该方法得到的分析结果与裂纹分布随应力多轴性的变化规律有很好的对应关系。另一个过程是基于裂纹萌生和扩展过程的建模，同时。从模拟结果中发现，所提出的程序是有效的描述疲劳寿命和裂纹形态取决于微观组织和多轴应力状态。

项目成果

星出敏彦: 日本機械学会論文集 A編. 55. (1989)

Toshihiko Hoshide：日本机械工程师学会会议记录，第 A. 55 卷。（1989 年）

Tatsuo,INOUE: Proc.Far East Fract.Group Workshop. 177-184 (1988)

Tatsuo,INOUE：Proc.Far East Fract.Group 研讨会。

星出敏彦: 材料. 38. (1989)

星出俊彦：材料 38。（1989）

Tatsuo INOUE: "Damage Mechanics Approach to Crack Initiation in Notched Component under Multiaxial Low Cycle Fatigue" Proceedings of the Far East Fracture Group Workshop. 177-184 (1988)

Tatsuo INOUE：“多轴低周疲劳下缺口部件裂纹萌生的损伤力学方法”远东断裂小组研讨会论文集。

Toshihiko HOSHIDE: "Propagation Behavior of Elastic-Plastic Fatigue Crack under Biaxial Stress State" Journal of the Society of Material Science, Japan. 38. (1989)

Toshihiko HOSHIDE：“双轴应力状态下弹塑性疲劳裂纹的传播行为”日本材料科学学会杂志。