3D Studies of Indentation by Combined X-Ray Tomography and Digital Volume Correlation
3D Studies of Indentation by Combined X-Ray Tomography and Digital Volume Correlation
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DOI：
10.4028/www.scientific.net/kem.592-593.14
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
M. Mostafavi;Yelena Vertyagina;C. Reinhard;R. Bradley;Xia Jiang;M. Galano;J. Marrow
中科院分区：
文献类型：
--
作者：
M. Mostafavi;Yelena Vertyagina;C. Reinhard;R. Bradley;Xia Jiang;M. Galano;J. Marrow
硬度测试通过测量施加压痕的载荷-位移响应，从小试样中获得材料性能；这是一种表面表征技术，因此，除了在光学透明材料中，没有直接观察材料内部假设的损伤和变形过程。三维数字图像相关（数字体积相关）应用于研究压痕下的变形，绘制高分辨率同步加速器x射线计算机断层扫描（0.9 μm体素大小）之间的相对位移。研究了两类材料：韧性铝-碳化硅复合材料（Al-SiC）和脆性氧化铝（Al2O3）。实测的赫茨压痕位移与弹塑性有限元模拟结果吻合较好。在氧化铝中，在维氏压痕下观察到径向裂纹，并且首次在载荷下原位测量裂纹张开位移。讨论了这种表征技术的潜在应用，它不需要微观结构特征的分辨率。
Hardness testing obtains material properties from small specimens via measurement of load-displacement response to an imposed indentation; it is a surface characterisation technique so, except in optically transparent materials, there is no direct observation of the assumed damage and deformation processes within the material. Three-dimensional digital image correlation (digital volume correlation) is applied to study deformation beneath indentations, mapping the relative displacements between high-resolution synchrotron X-ray computed tomographs (0.9 μm voxel size). Two classes of material are examined: ductile aluminium-silicon carbide composite (Al-SiC) and brittle alumina (Al2O3). The measured displacements for Hertzian indentation in Al-SiC are in good agreement with an elastic-plastic finite element simulation. In alumina, radial cracking is observed beneath a Vickers indentation and the crack opening displacements are measured, in situ under load, for the first time. Potential applications are discussed of this characterization technique, which does not require resolution of microstructural features.