In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension
In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension
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DOI：
10.1016/j.compositesa.2021.106390
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
Yang-Shiau Chen;Yuan Shi;C. Chateau;J. Marrow
中科院分区：
文献类型：
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作者：
Yang-Shiau Chen;Yuan Shi;C. Chateau;J. Marrow
采用原位X射线CT对液态硅浸渗法制备的C/C-SiC复合材料进行了单调拉伸试验。试样相对于拉伸方向具有不同的纤维取向，0°/90°和±45°，使得张力分别占轴内和离轴载荷。3D XCT图像提供了SiC-Si分布和C纤维束取向的明确可视化和定量测量。通过数字体积相关法测量全场位移和应变场，观察响应轴内和轴外载荷的局部变形差异。在两个试样中，拉伸载荷在低应力（<50 MPa）下触发显著的应变局部化。在低和高施加应力下观察到的强烈局部变形主要在厚度方向上，表明局部分层。这些观察结果表明，在C/C-SiC复合材料的损伤发展的残余应力的重要性。
C/C-SiC composites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with in situ X-ray computed tomography. The specimens had different fibre orientations with respect to the tensile direction, 0°/90° and ±45°, such that the tension accounted for in-axis and off-axis loads, respectively. The 3D XCT images provided explicit visualisations and quantitative measurements of the distributions of SiC-Si and the orientations of the C fibre bundles. The full-field displacement and strain fields were measured by Digital Volume Correlation, observing a difference in the local deformations in response to the in-axis and off-axis loading. In both specimens, the tensile load triggered significant strain localisations at low stress (<50 MPa). Strong local deformations, observed at both low and high applied stresses, were mostly in the through-thickness direction, indicating local delamination. These observations show the importance of residual stresses to damage development in C/C-SiC composites.