Microscopic Mechanism of Environmentally Assisted Cracking by the Inverse Analysis of Measured Data

通过实测数据反演分析环境辅助开裂微观机理

基本信息

  • 批准号:
    11450278
  • 负责人:
  • 金额:
    $ 5.25万
  • 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

项目摘要

For the Acoustic Emission (AE), advanced source location and simulation methods for guided waves (pipe and rod) are developed. Source dynamics of hydrogen blister, delayed fracture and void formation (Ti-Pd) were obtained by the wave form simulation of So and L (0,1) waves by the wave form matching of computed to the measured. Here the wave form was computed by the convolution of assumed crack opening with experimental over-all transfer function determined using the expansion of the compression type PZT element. Micro-cracks of delayed fracture of high tension steel was found to be close to the Rayleigh wave velocity and caused sub-cracks by leaking the wave-energy during fast propagation. Extremely fast micro-crack of delayed fracture was first studied by using the AE sensors at marker and the rod specimen where the dispersive low frequency guided waves were monitored, but was slower than those of mechanical fractures of quenched high carbon steel. It was also first that the strong an … More d fast guided wave Aes were monitored during hydrogen absorbing of Ti-Pd alloy rod, possibly by void formation by hydrogen gas. Such Aes are supposed to be produced by rapid void formation by hydrogen gas emitted from titanium hydride.The author first proposed the AE source location method using very few AE sensors. Source locations of guided wave, both in the longitudinal direction and transverse section, were determined only a single AE sensor. Computer soft ware for velocity dispersion and modal analysis, required for such signal analysis were developed at home and now opened on the internet.Trans-granular APC-SCC does not emit Aes while inter-granular one does emit Aes with sufficient amplitudes. Fluctuation dynamics of corrosion potential during APC-SCC were attempted using the over-all transfer function determined by artificial fracture of PVD-TiN film. However, it could not be studied by the inverse processing of potential fluctuation due to it's too slow response. Wavelet analysis (time-frequency domain analysis) revealed that fluctuation frequency higher than 0.2Hz was dominant during the incubation period, but lower frequency during SCC propagation. Less
对于声发射(AE),先进的源定位和模拟方法的导波(管和杆)。通过对So波和L(0,1)波的波形模拟,得到了氢泡、延迟断裂和空洞形成(Ti-Pd)的源动力学。在这里,波形计算的卷积的假设裂纹开口与实验的整体传递函数确定使用的压缩型PZT元件的扩展。研究发现,高强度钢延迟断裂的微裂纹与瑞利波传播速度接近,在快速传播过程中能量泄漏,导致亚裂纹的产生。首次利用声发射传感器对延迟断裂的超快速微裂纹进行了研究,并对棒试件进行了低频导波监测,但其速度比淬火高碳钢的机械断裂慢。这也是第一次, ...更多信息 在Ti-Pd合金棒吸氢过程中,监测到了3d快导波Aes,这可能是由于氢气在钛合金棒中形成空穴所致。作者首次提出了用很少的声发射传感器进行声发射源定位的方法。利用单个声发射传感器确定了导波源在纵向和横截面上的位置。国内已研制出了分析这类信号所需的速度频散和模态分析的计算机软件,目前已在互联网上公开。穿晶型APC-SCC不发射Aes,而沿晶型APC-SCC发射Aes,但有足够的振幅。利用PVD-TiN膜的人工破裂所确定的整体传递函数,对APC-SCC过程中的腐蚀电位波动动力学进行了尝试。然而,由于其响应速度太慢,无法通过电位涨落的逆处理来研究。小波分析(时频域分析)显示,在孕育期,高于0.2Hz的波动频率占主导地位,而在SCC传播过程中,频率较低。少

项目成果

期刊论文数量(56)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
竹本幹男,正木龍士,田中栄吉: "7MHz帯域AE波形シミュレーションとレーザー励起縦波速度モニタリングによる遅れ破壊のダイナミックスと前駆過程"材料と環境. 49-4. 235-242 (2000)
Mikio Takemoto、Ryuji Masaki、Eikichi Tanaka:“使用 7MHz 频带 AE 波形模拟和激光激发纵波速度监测的延迟断裂动力学和前驱过程”材料与环境 49-4(2000)。
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    0
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竹本幹男, 正木龍士, 田中栄吉: "7MHz帯域AE波形シミュレーションとレーザー励起縦波速度モニタリングによる遅れ破壊のダイナミックスと前駆過程"材料と環境. 49-4. 235-242 (2000)
Mikio Takemoto、Ryuji Masaki、Eikichi Tanaka:“使用 7MHz 频带 AE 波形模拟和激光激发纵波速度监测的延迟断裂动力学和前驱过程”材料与环境 49-4(2000)。
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  • 期刊:
  • 影响因子:
    0
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Teruyoshi Sato, Mikio Takemoto and Kanji Ono: "Effect of Fracture Dynamics in Thin Plate on the Waveform and Radiation Pattern of the Lamb Waves"Jpn. J. Appl. Phys.. 38. 3193-3200 (1999)
Teruyoshi Sato、Mikio Takemoto 和 Kanji Ono:“薄板断裂动力学对兰姆波波形和辐射模式的影响”Jpn。
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    0
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Shinya Fujimoto, Mikio Takemoto and Kanji Ono: "AE Monitoring of Chloride Stress Corrosion Cracking of Austenitic Stainless Steel"Journal of Acoustic Emission. 63-74 (2001)
Shinya Fujimoto、Mikio Takemoto 和 Kanji Ono:“奥氏体不锈钢氯化物应力腐蚀裂纹的声发射监测”声发射杂志。
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    0
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Fukutoshi Uchida, Hideo Nishino, Mikio Takemoto and Kanji Ono: "Cylinder Wave Analysis for AE source Location and Fracture Dynamics of Stress Corrosion Cracking of Brass Tube"Journal of Acoustic Emission. 75-84 (2001)
Fukutoshi Uchida、Hideo Nishino、Mikio Takemoto 和 Kanji Ono:“黄铜管应力腐蚀开裂的 AE 源位置和断裂动力学的圆柱波分析”声发射杂志。
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  • 影响因子:
    0
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TAKEMOTO Mikio其他文献

TAKEMOTO Mikio的其他文献

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{{ truncateString('TAKEMOTO Mikio', 18)}}的其他基金

Genealogy of Noh text of Zeam's period
泽姆时期的能剧谱系
  • 批准号:
    17H02313
  • 财政年份:
    2017
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A comprehensive survey and classification of all Muromachi-era text of Noh plays in preparation for the publication of Yokyoku Taisei
对室町时代所有能剧文本进行全面调查和分类,为《Yokyoku Taisei》的出版做准备
  • 批准号:
    17202006
  • 财政年份:
    2005
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Genealogic Classification of Noh Texts and Compilation of Yokyoku Taisei (Collection of Noh Texts)
能剧的谱系分类与《能剧大成》的编纂
  • 批准号:
    13301023
  • 财政年份:
    2001
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
The Basic Research on Formative Process of Noh Drama in the Ages of Middle and Latter Muromachi Era
室町中后期能剧形成过程的基础研究
  • 批准号:
    11610453
  • 财政年份:
    1999
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A General Study of the Formative Process of Noh Drama in the Ages of Kan'ami and Zeami
关阿弥、世阿弥时代能剧形成过程综述
  • 批准号:
    08610447
  • 财政年份:
    1996
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of Heat-Resistant Displacement Sensitive Sensor and Mechanism Elucidation of Environmental Assisted Cracking at Elevated Temperature by Inverse Processing of Dissipative Elastic Wave
耐热位移敏感传感器的研制及耗散弹性波逆处理高温环境辅助开裂机理的阐明
  • 批准号:
    08455340
  • 财政年份:
    1996
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Mechanism of Environmental Assisted Cracking by the AE Source Inversion and Moment Tensor Analyzes
声发射源反演和矩张量分析的环境辅助破裂机理
  • 批准号:
    06650811
  • 财政年份:
    1994
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Study of Noh play in the Edo Era
江户时代能剧研究
  • 批准号:
    02610205
  • 财政年份:
    1990
  • 资助金额:
    $ 5.25万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
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