Three-dimensional imaging analysis of tension-compression fatigue damage in viscoelastic damper
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摘要: 采用显微CT(micro-computed tomography)对阻尼器结构分段进行了三维观察,成像分辨率为91.89 μm。通过三维分割成功提取了橡胶层空隙、开裂缺陷,并定量分析空隙缺陷的直径、总体积等几何特征参数。为了提高成像分辨率,对单个空隙缺陷进行局部高分辨显微CT成像及三维可视化分析,获取单个空隙形貌信息。结果表明:黏弹阻尼器以产生脱黏、空隙、开裂缺陷为主,上、下段橡胶层空隙最大直径分别为13.12、12.21 mm,发现上、下段端部存在开裂现象,环状裂纹体向上延伸至橡胶层表面,向下延伸至铝合金内筒外壁。局部显微CT三维成像分辨率为20.85 μm,结果显示单个空隙表面形貌存在褶皱、凹坑现象,但未发现微小裂纹。DR(digital radiography)成像实验结果表明通过X射线切向照相检测黏弹阻尼器橡胶层脱黏、空隙缺陷是可行的。Abstract: Three-dimensional observation of the damper was performed by micro-CT (micro computed tomography), and the imaging resolution was 91.89 μm. The voids and cracking defects of the rubber layer were successfully extracted through three-dimensional segmentation, and quantitative analysis of defects’ geometric parameters such as diameter and total volume was performed. In order to improve the imaging resolution, local high-resolution micro-CT imaging and 3D visualization analysis of single void defects were performed to obtain the information of single void morphology. The results showed that the main defects of viscoelastic damper mainly included debonding, void and cracking, the maximum void diameter of the upper and lower rubber layers was 13.12 mm and 12.21 mm, respectively. It was found that cracking existed at the ends of the upper and lower sections, the ring-shaped crack body extended upward to the surface of the rubber layer and downward to the outer wall of the aluminum alloy inner tube. The three-dimensional imaging resolution of local micro-CT was 20.85 μm. The experimental results showed that the surface morphology of a single void had wrinkles and pits, but no micro-cracks were found. Digital radiography(DR) experiment results show that it is feasible to detect the debonding and void defects of rubber layer in viscoelastic damper by X-ray tangential radiography.
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Key words:
- viscoelastic damper /
- 3D imaging /
- void /
- debonding /
- 3D visualization
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