Study on Low Cycle Fatigue Failure Mechanism of Steel Material by Acoustic Emission

钢材料低周疲劳失效机理的声发射研究

• 批准号: 10650459
• 负责人: TATEISHI Kazuo
• 金额: $ 2.24万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650459/
• 关键词: Low cycle fatigue; Acoustic Emission; Failure Mode

In order to investigate the failure mechanism of steel material, the properties of acoustic emissions from the material were measured and analysed.Particularly, low cycle fatigue failure was mainly investigated. Low cycle fatigue tests were carried out on a specimen modeling pressed welded joint of steel reinforing bars, and a specimen with hour-glass shape made from mild steel. In some specimens, mechanical flaws were incuded on purpose in order to investigate the relationship between failure mechanism and the properties of acoustic emission. In addition, strain levels were varied in order to change the low cycle failure modes of specimens.Waveforms of aoustic emission were recorded by digital oscilloscope. Measured waveform was analysed from the viewpoints of frequency, occurrence time, etc. The relationship between these AE properties and failure mode depending on strain level and existance of mechanical flaws were investigated in detai.

为了研究钢材料的破坏机理，对钢材料的声发射特性进行了测量和分析。特别是对低周疲劳失效进行了重点研究。对钢筋压焊接头模型试件和低碳钢沙漏形试件进行了低周疲劳试验。在一些试样中故意加入力学缺陷，以研究破坏机制与声发射特性之间的关系。此外，应变水平的变化，以改变试样的低循环破坏模式。用数字示波器记录声发射波形。从频率、发生时间等角度对实测波形进行了分析。详细研究了这些声发射特性与应变水平下的破坏模式和存在的力学缺陷之间的关系。

项目成果

鈴木元敏,足立一郎,舘石和雄,魚本健人: "異形鉄筋ガス圧接継手の正負交番繰返し強度に関する実験的研究"土木学会第26回関東支部技術研究発表会. 235-236 (1999)

Mototoshi Suzuki、Ichiro Adachi、Kazuo Tateishi、Kento Uomoto：“变形增强气压焊接接头正负交替循环强度的实验研究”日本土木工程学会第 26 届关东分会技术研究报告 235-236（1999 年）。 ）

長野岳宏,矢島哲司,舘石和雄,魚本健人: "内部欠陥のある鉄筋ガス圧接継手の強度特性評価"土木学会第26回関東支部技術研究発表会. 233-234 (1999)

Takehiro Nagano、Tetsuji Yajima、Kazuo Tateishi、Kento Uomoto：“有内部缺陷的强化气压焊接接头的强度特性评估”日本土木工程学会第26届关东分会技术研究报告233-234（1999）。

2) Suzuki, M., Nagano, T., Tateishi, K.and Adachi, I.: "Low cycle fatigue of pressed welded joint of steel reinforcement including inner flaws"Proc.of the 54th Annual Conference of JSCE. 770-771 (1999)

2) Suzuki, M.、Nagano, T.、Tateishi, K. 和 Adachi, I.：“含内部缺陷的钢筋压制焊接接头的低周疲劳”，JSCE 第 54 届年会论文集。

4) Suzuki, M., Adachi, I., Tateishi, K.and Uomoto, T.: "Experimental Study on Strength of the joint of steel reinforcements under cyclic loading"Proc.of the 26th Annual Conference of Kanto Branch, JSCE. 235-236 (1999)

4) Suzuki, M.、Adachi, I.、Tateishi, K.和Uomoto, T.：“循环荷载下钢筋接头强度的实验研究”日本化学工程师学会关东分会第26届年会论文集。

鈴木元敏,長野岳宏,舘石和雄,足立一郎: "欠陥を有する異形鉄筋ガス圧接継手の強度特性"コンクリート工学年次論文報告集. 21,3. 319-324 (1999)

Mototoshi Suzuki、Takehiro Nagano、Kazuo Tateishi、Ichiro Adachi：“有缺陷的变形增强气压焊接接头的强度特性”混凝土工程年论文 21、3.319-324（1999）