Development of Nano-scale Dynamic Observation System on Fatigue Crack Growth Behavior using Image Processing Technique
利用图像处理技术开发疲劳裂纹扩展行为纳米动态观测系统
基本信息
- 批准号:11555034
- 负责人:
- 金额:$ 7.42万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In order to investigate fatigue crack growth mechanism, fatigue testing machine which can be installed the stage of An atomic force microscope (AFM) was designed and manufactured. Fatigue crack growth test under constant amplitude loading was conducted on an cc-brass using this testing apparatus. The knowledge obtained in this project is as follows: Nano-scale on-line observation of fatigue crack growth behavior becomes possible through the development of new designed testing system installed on AFM. In the case that the fatigue crack driving force is relatively small, one slip system, Schmitt factor of which is relatively high, operated preferentially and fatigue crack grew along this slip line. However, cyclic strain hardening occurs on that slip line, resulting in the decrease of growth rate or crack arrest. At this point, the effect of secondary slip system become larger and fatigue crack deflected to the secondary slip direction. After fatigue crack grew a short distance, the primary slip system become operates, and fatigue crack branched and grew along that. It was found that fatigue crack grew a zig-zag manner in low crack growth rate region. On the other hand, in the high crack driving force region, discrete slip lines which emanated from crack edges were observed clearly along the two preferred slip directions. It implies that two preferential slips operated to almost identical extent simultaneously and fatigue crack grew in near mode I. The slip deformation during loading and unloading was observed successively and it was found that the operation of slips behind the fatigue crack tip resulted in crack closure and that at the crack tip brought about crack growth.
为了研究疲劳裂纹扩展机理,设计并制造了可安装原子力显微镜(AFM)载物台的疲劳试验机。利用该装置对黄铜进行了恒幅疲劳裂纹扩展试验。本计画所取得的主要成果如下:开发一套新设计的测试系统,安装在原子力显微镜上,使奈米尺度的疲劳裂纹成长行为的线上观察成为可能。在疲劳裂纹驱动力较小的情况下,一个施密特因子较高的滑移系优先起作用,疲劳裂纹沿着该滑移线扩展。然而,循环应变硬化发生在该滑移线上,导致扩展速率降低或裂纹止裂。此时,二次滑移系的影响变大,疲劳裂纹向二次滑移方向偏转。疲劳裂纹扩展一小段距离后,主滑移系开始活动,疲劳裂纹沿主滑移系分支沿着扩展。结果表明,在低裂纹扩展速率区,疲劳裂纹呈锯齿形扩展。另一方面,在高裂纹驱动力区,从裂纹边缘发出的离散滑移线沿沿着两个优先滑移方向被清楚地观察到。这意味着两个优先滑移同时以几乎相同的程度起作用,疲劳裂纹以近I型扩展。在加载和卸载过程中连续观察到滑移变形,发现疲劳裂纹尖端后的滑移作用导致裂纹闭合,而裂纹尖端的滑移作用导致裂纹扩展。
项目成果
期刊论文数量(26)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
菅田 淳: "低進展速度領域における疲労き裂の分岐・屈曲挙動のAFM観察"日本機械学会材料力学部門講演会. 201-202 (2001)
Jun Suda:“低扩展率区域疲劳裂纹的分叉和弯曲行为的AFM观察”日本机械工程学会材料力学分部讲座201-202(2001年)。
- DOI:
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- 影响因子:0
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菅田 淳: "AFMを用いた微視的連続観察手法による疲労き裂進展機構の解明"日本材料学会 第25回疲労シンポジウム. 55-58 (2000)
Jun Suda:“通过使用 AFM 的显微连续观察方法阐明疲劳裂纹扩展机制”第 25 届材料学会疲劳研讨会,日本 55-58 (2000)。
- DOI:
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- 影响因子:0
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菅田 淳: "α黄銅における微小疲労き裂進展挙動のAFM内疲労試験機によるその場観察"第45回日本学術会議材料研究連合会講演論文集. 251-252 (2001)
Jun Suda:“使用 AFM 疲劳测试仪对 α-黄铜中的微疲劳裂纹扩展行为进行现场观察”第 45 届日本材料研究协会学术委员会会议记录 251-252 (2001)。
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- 影响因子:0
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A. Sugeta and M. Jono: "An Atomic Force Microscope Observation of Fatigue Crack Growth Behavior"Proc. of 2001 SEM Annual Conference. 664 (2001)
A. Sugeta 和 M. Jono:“疲劳裂纹扩展行为的原子力显微镜观察”Proc。
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- 影响因子:0
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ATSUSHI SUGETA: "An Atomic Force Microscope Observation of Fatigue Crack Growth Behavior"Proc.2001 AEM Annual Conferene. 664-670 (2001)
ATSUSHI SUGETA:“疲劳裂纹扩展行为的原子力显微镜观察”Proc.2001 AEM 年度会议。
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{{ truncateString('SUGETA Atsushi', 18)}}的其他基金
Elucidation of fatigue damage mechanism of adhesive bonding material in severe wet environment by in- situ microscopy
原位显微镜阐明严重潮湿环境下粘接材料的疲劳损伤机理
- 批准号:
24656090 - 财政年份:2012
- 资助金额:
$ 7.42万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Development of Microscopic Observation system based on Atomic Force Microscopy of Fatigue Damage Process under Hydrogen Environment And Investigation of Damage Mechanism
氢环境下疲劳损伤过程原子力显微镜显微观察系统研制及损伤机理研究
- 批准号:
21656035 - 财政年份:2009
- 资助金额:
$ 7.42万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
The Production of nanocrystal materials with high fatigue damage resistance based on clarification of non-scale fatigue damage mechanism
基于阐明非尺度疲劳损伤机理的高抗疲劳损伤纳米晶材料的制备
- 批准号:
15360056 - 财政年份:2003
- 资助金额:
$ 7.42万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Nano-Fractography Study of Fatigue Crack Growth under Service Loading in Ceramics
陶瓷使用载荷下疲劳裂纹扩展的纳米断口研究
- 批准号:
09450051 - 财政年份:1997
- 资助金额:
$ 7.42万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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