Experimental and Numerical Study on the Unstable ModeII Crack Growth with Image Analysis

不稳定II型裂纹扩展的图像分析实验与数值研究

• 批准号: 22560489
• 负责人: OKINAKA Tomoo
• 金额: $ 2.75万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560489/
• 关键词: 画像計測; 光弾性実験; 超高速ビデオカメラ; PDS-FEM; 不安定成長; X-FEM; き裂不安定成長; 動的光弾性試験; 圧縮き裂; 動的光弾性実験

To study the unstable crack growth mechanism under compressive loading, the experiment of two dimensional crack growth under uni-axial compression, the experiment and numerical simulation of three dimensional inner crack growth has been performed. Image analysis with ultra-high-speed camera is applied to the two dimensional unstable crack growth under quasi-static uniaxial compression. Stress field around the moving crack tip is visualized by means of photo-elastic technique and images of growing cracks and the stress field are captured with the frame rate of 250,000 fps. As a result, it is revealed that the crack growth is affected by the stress wave travelling the specimen. Image analysis with ultra-high speed camera is also applied to the three dimensional inner crack growth, and the growth is visualized successfully. Numerical analysis with PDS-FEM technique is applied to the three dimensional inner crack growth, and the result shows a good agreement with the experimental result.

为了研究压缩载荷下不稳定裂纹扩展机理，开展了单轴压缩下二维裂纹扩展实验、三维内裂纹扩展实验及数值模拟。将超高速相机图像分析应用于准静态单轴压缩下二维不稳定裂纹扩展。移动裂纹尖端周围的应力场通过光弹性技术可视化，并以 250,000 fps 的帧速率捕获生长裂纹和应力场的图像。结果表明，裂纹扩展受到样品中传播的应力波的影响。超高速相机图像分析也应用于三维内裂纹扩展，并成功实现了扩展的可视化。利用PDS-FEM技术对三维内裂纹扩展进行数值分析，结果与实验结果吻合较好。

项目成果

き裂の不安定成長問題へのX-FEMの適用

X-FEM在不稳定裂纹扩展问题中的应用

• 发表时间: 2010
• 作者: 沖中知雄