Mechanism of cumulative damage to short fiber type C/SiC under tension
Mechanism of cumulative damage to short fiber type C/SiC under tension
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DOI：
10.1016/j.jeurceramsoc.2021.09.041
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发表时间：
2021-09
影响因子：
5.7
通讯作者：
Yuta Tobata;S. Takeuchi;K. Goto
中科院分区：
文献类型：
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作者：
Yuta Tobata;S. Takeuchi;K. Goto
通过加载-卸载试验研究了不同峰值应力下的应力-应变关系，以阐明C/SiC型短纤维在拉伸状态下的累积损伤机理。损伤观察揭示了它们的裂纹长度、数量和角度特征。此外，通过扩展Basista方程并代入测量的损伤特征来估计应力-应变关系，显示出非线性的应力-应变关系。裂纹以横向纤维束的形式扩展，没有纤维断裂，连接着与拉伸轴成75°-90°取向的其他裂纹。应力-应变关系的定性和定量估计表明，横向纤维束在贯通厚度平面上的I型和II型混合型裂纹张开导致了应力-应变的非线性关系。
Stress–strain relations at different degrees of peak stress were investigated using loading–unloading tests to elucidate cumulative damage mechanisms of short fiber type C/SiC under tension. Damage observations revealed their crack length, number, and angle characteristics. Furthermore, stress–strain relations were estimated by expanding Basista’s equations and by substituting measured damage characteristics into them, which revealed a nonlinear stress–strain relation. Cracks propagated in transverse fiber bundles without fiber fracture, connecting other cracks that had 75 ° – 90 ° orientation to the tensile axis. Stress–strain relations estimated qualitatively and quantitatively suggest that mixed mode I and mode II crack opening in transverse fiber bundles in the through-thickness plane caused the stress–strain nonlinear relations.