Compressive strength and damage mechanisms of 2D-C/SiC composites at high temperatures

Compressive strength and damage mechanisms of 2D-C/SiC composites at high temperatures
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2D-C/SiC复合材料高温下的压缩强度和损伤机制

DOI:
10.1016/j.ceramint.2018.04.255
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发表时间:
2018-08
影响因子:
5.2
通讯作者:
Li Mei
Li Mei
中科院分区:
材料科学1区
文献类型:
--
作者:
Li Lihua;Zhang Chengyu;Zhang Chen;Wang Kejie;Bai Hui;Han Dong;Li Mei

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目前,我们研究了 2D-C/SiC 复合材料在室温 (RT) 至 1600°C 范围内的抗压强度。通过在室温下进行加载/卸载试验来研究损伤演变,并通过观察断裂形态来阐明损伤机制。研究发现,2D-C/SiC 的抗压强度一直保持到 1200°C,然后随着温度的升高而降低。抗压强度的变化与基体模量的下降密切相关。 2D-C/SiC的压缩损伤始于0°纤维的屈曲,随后发生原始孔隙的打开和关闭、纵向束间裂纹的萌生和扩展、纵向裂纹使90°纤维束分离、束内孔隙基体开裂、基体裂纹扩展至0°纤维束、0°纤维束中裂纹的连接以及 90°纤维束中的纵向裂纹。
Compressive strength of 2D-C/SiC composite was investigated from room temperature(RT) to 1600 °C at present work. Damage evolution was investigated by conducting loading/unloading tests at RT and the damage mechanisms were elucidated by observing the fracture morphology. It is found that compressive strength of 2D-C/SiC was retained until 1200 °C and then decreased with increasing temperature. The variation of compressive strength is closely related to the degradation in matrix modulus. The compressive damage of 2D-C/SiC starts at the buckling of 0° fiber and is followed by opening and closing of original pores, initiation and growth of longitudinal interbundle cracks, separation of 90° fiber bundles by longitudinal cracks, matrix cracking from intrabundle pores, propagation of matrix cracks into 0° fiber bundles, connection of cracks in 0° fiber bundles and longitudinal cracks in 90° fiber bundles.
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