Mechanical behavior of C/SiC composites under hypervelocity impact at different temperatures: Micro-structures, damage and mechanisms
Mechanical behavior of C/SiC composites under hypervelocity impact at different temperatures: Micro-structures, damage and mechanisms
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DOI：
10.1016/j.compositesa.2016.05.015
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发表时间：
2016-09
影响因子：
8.7
通讯作者：
Tao Li;J. Mo;Xia Yu;T. Suo;Yulong Li
中科院分区：
文献类型：
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作者：
Tao Li;J. Mo;Xia Yu;T. Suo;Yulong Li
为了了解C/SiC复合材料在不同温度下的超高速冲击力学行为，利用改装的电炮进行了冲击试验，并进行了相应的数值模拟。此外，还测量了冲击试验后由损伤引起的剩余强度的降低。拉伸和剪切破坏发生在不同的断裂区域，断裂周围的损伤区非常有限(<；5 mm)。此外，碎屑云的分布呈“三带”模式，形成机制不同，表明中心带存在高能粉状柱。对于侵彻孔直径，随着冲击速度的增加而增大。低温下，随着力学性能的变化和新微裂纹的形成，断口越光滑，损伤区和穿透孔直径越小。此外，超高速冲击引起的损伤显著降低了C/SiC复合材料的强度。
To understand the mechanical behavior of C/SiC composites under hypervelocity impact at different temperatures, impact tests are conducted using a modified electrical gun, and corresponding numerical simulations are implemented. In addition, the decrease of residual strength induced by damage is also measured after impact tests. Tensile and shear failures occur in different regions of fracture, and the damage zone around the fracture is very confined (< 5 mm). Besides, the distribution of debris clouds shows “three zones” mode, forming with different mechanisms, and demonstrates that there is a high-energy powdering column in the centre zone. As for the diameter of penetration hole, it increases with impact velocity. At low temperature, with the change of mechanical properties and forming of new micro-cracks, the fracture is smoother, while the diameters of damage zone and penetration hole are smaller. Furthermore, the damage induced by hypervelocity impact significantly reduces the strength of C/SiC composites.