Direct Observation of the Mechanisms of Fatigue Crack Growth

疲劳裂纹扩展机制的直接观察

基本信息

  • 批准号:
    06044275
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Overseas Scientific Survey.
  • 财政年份:
    1994
  • 资助国家:
    日本
  • 起止时间:
    1994 至 无数据
  • 项目状态:
    已结题

项目摘要

A.Investigation of the effect of frequency, temperature and material on size effect of fatigue crack propagation.The same material (Ni-base superalloy in this year) was tasted in the three research groups.(1) At University of Sheffield, the automated observation of the initiation and propagation of small fatigue cracks in large specimens is conducted at both room temperature and 800*C.The effect of micro-structure on the initiation and propagation of small fatigue cracks is being made clear.(2) At Kyushu University, the automated observation of the fatigue crack propagation of small specimens in the Instron-type scanning electron microscopes connected to servohydraulic fatigue testing machine is conducted at 50 thousand magnifications. The relationship between the deformation of the crack tip (crack opening-closing behavior). micro-structure and fatigue crack growth ratio is being made clear.(3) At Osaka University, the dynamic observation of fatigue crack in the Osaka-type scanning electron microscopes connected to servohydraulic fatigue testing machine is conducted under variable amplitude loads. The effect of variable amplitude loads on short fatigue crack growth is being made clear.B.Investigation of the relationship between the crack shape and specimen size by 3-D surface crack propagation analyzes.(4) At Kyushu University, the analytical method based on Boundary ElementMethod, which is extremely precise, for stress intensity factors of 3-D surface crack is developed.(5) Comparing the result of (4) and that by Finite ElementMethod at University of Sheffield, the precision of FEM is confirmed to be suit for the prediction of the 3-D crack growth.
A.研究频率、温度和材料对疲劳裂纹扩展尺寸效应的影响。三个研究组品尝了相同的材料(今年的镍基高温合金)。(1)在谢菲尔德大学,自动化在室温和800℃下对大型试件中细小疲劳裂纹的萌生和扩展进行了观察。显微组织对细小疲劳裂纹的萌生和扩展的影响正在明确。(2) 九州大学,自动化的在连接伺服液压疲劳试验机的Instron型扫描电子显微镜上以5万倍的放大倍数对小试样的疲劳裂纹扩展进行观察。裂纹尖端变形(裂纹张开-闭合行为)之间的关系。 (3)大阪大学利用连接伺服液压疲劳试验机的大阪型扫描电子显微镜在变幅载荷下进行疲劳裂纹的动态观察。变幅载荷对短疲劳裂纹扩展的影响正在明确。B.通过 3-D 表面裂纹扩展分析研究裂纹形状和试样尺寸之间的关系。(4) 在九州大学,基于开发了高精度的三维表面裂纹应力强度因子边界元法。(5)将式(4)的结果与谢菲尔德大学有限元法的结果进行比较,证实有限元法的精度是合适的。用于预测 3-D 裂纹扩展。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Liu Yi and R.A.Smith: "Short Fatigue Cracks Measured by an Automated Image Processing System" ASTM STPに掲載予定.
刘毅和 R.A.Smith:“通过自动图像处理系统测量的短疲劳裂纹”将在 ASTM STP 上发表。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
H.Noguchi and R.A.Smith: "An Analysis of a Semi-Infinite Solid with Three-Dimensional Cracks" Engineering Fracture Mechanics. (to be submitted).
H.Noguchi 和 R.A.Smith:“具有三维裂纹的半无限固体的分析”工程断裂力学。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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MURAKAMI Yukitaka其他文献

The Effect of Hydrogen on Fatigue Crack Growth Behavior and Ductility Loss of Austenitic Stainless Steels
氢对奥氏体不锈钢疲劳裂纹扩展行为和延展性损失的影响
Effect of Hydrogen on Ultralong Life Fatigue Failure of a High Strength Steel and Fracture Morphology of ODA.
氢对高强度钢超长寿命疲劳失效和ODA断裂形貌的影响。
Effect of Hydrogen on Fatigue Crack Growth and Martensitic Transformation of Stainless Steels
氢对不锈钢疲劳裂纹扩展和马氏体相变的影响
Effect of Hydrogen Charge on Fatigue Strength of Stainless Steel.
充氢量对不锈钢疲劳强度的影响。
Elimination of Conventional Fatigue Limit due to Fatigue Crack Originated at Nonmetallic Inclusion, and Non-propagation of Fatigue Crack Originated at Artificial Small Hole
消除源自非金属夹杂物的疲劳裂纹的常规疲劳极限,以及源自人工小孔的疲劳裂纹的不扩展

MURAKAMI Yukitaka的其他文献

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{{ truncateString('MURAKAMI Yukitaka', 18)}}的其他基金

Post-translational modifications of proteins from periodontpathic bacteria: role of glycosylation and phosphorylation
牙周病细菌蛋白质的翻译后修饰:糖基化和磷酸化的作用
  • 批准号:
    23592720
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Relationship between glycosylation and virulence of surface proteins from periodontopathic bacterium
牙周病细菌表面蛋白糖基化与毒力的关系
  • 批准号:
    20592165
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Analysis of major outer membrane proteins from periodontopathogen and relationship between these proteins and clinical symptom in periodontitis
牙周病原菌主要外膜蛋白分析及其与牙周炎临床症状的关系
  • 批准号:
    15591958
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Quantitative analysis fatigue fracture surfaces under Mode II and III and its application to tribology problems
模式II和模式III下疲劳断口的定量分析及其在摩擦学问题中的应用
  • 批准号:
    11450047
  • 财政年份:
    1999
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Fatigue Mechanism of Superlong Fatigue Failure of steels in Gigacycle Regime
十亿周体系钢超长疲劳失效的疲劳机理
  • 批准号:
    08405012
  • 财政年份:
    1996
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of Evaluation System of Mechanical Properties of Multi-Thin Layrs by Ultra-Micro Indentation Test
超微压痕试验多层薄层力学性能评价系统的研制
  • 批准号:
    07555351
  • 财政年份:
    1995
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Application of Fracture Mechanics to Micro and/or Macro Tribology Problem
断裂力学在微观和/或宏观摩擦学问题中的应用
  • 批准号:
    07305050
  • 财政年份:
    1995
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
SEM observation of damege mechanism of micro-tribological fracture on hard disk surface
硬盘表面微摩擦断裂损伤机理的SEM观察
  • 批准号:
    04402022
  • 财政年份:
    1992
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for General Scientific Research (A)
Application of fracture echanics to tribology problems
断裂力学在摩擦学问题中的应用
  • 批准号:
    03302029
  • 财政年份:
    1991
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)
Development of new high strength Al-Si eutectic alloys and investigation of their fatigue properties in extra-long life range.
新型高强度铝硅共晶合金的开发及其超长寿命范围内的疲劳性能研究。
  • 批准号:
    03555016
  • 财政年份:
    1991
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)

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    23K03600
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    2023
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