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Interpreting acoustic energy emission in SiC/SiC minicomposites through modeling of fracture surface areas
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2021-06-25 , DOI: 10.1016/j.jeurceramsoc.2021.06.030
B. Swaminathan , N.R. McCarthy , A.S. Almansour , K. Sevener , A.K. Musaffar , T.M. Pollock , J.D. Kiser , S. Daly

The relationship between acoustic emission (AE) and damage source areas in SiC/SiC minicomposites was modeled using insights from tensile testing in-scanning electron microscope (SEM). Damage up to matrix crack saturation was bounded by: (1) AE generated by matrix cracking (lower bound) and (2) AE generated by matrix cracking, and fiber debonding and sliding in crack wakes (upper bound). While fiber debonding and sliding exhibit lower strain energy release rates than matrix cracking and fiber breakage, they contribute significant damage area and likely produce AE. Fiber breaks beyond matrix crack saturation were modeled by two conditions: (i) only fiber breaks generated AE; and (ii) fiber breaks occurred simultaneously with fiber sliding to generate AE. While fiber breaks are considered the dominant late-stage mechanism, our modeling indicates that other mechanisms are active, a finding that is supported by experimental in-SEM observations of matrix cracking in conjunction with fiber failure at rupture.



中文翻译:

通过对断裂表面积建模来解释 SiC/SiC 微型复合材料中的声能发射

声发射 (AE) 与 SiC/SiC 微型复合材料中损伤源区域之间的关系是使用扫描电子显微镜 (SEM) 中拉伸测试的见解建模的。破坏达到基体裂纹饱和的界限为:(1) 基体开裂产生的 AE(下限)和(2)基体开裂产生的 AE,以及裂纹尾迹中的纤维脱粘和滑动(上限)。虽然纤维脱粘和滑动表现出比基体开裂和纤维断裂更低的应变能释放率,但它们会造成显着的损坏区域并可能产生 AE。超过基体裂纹饱和度的纤维断裂由两种条件建模:(i)纤维断裂产生的AE;(ii) 纤维断裂与纤维滑动同时发生以产生 AE。虽然纤维断裂被认为是主要的后期机制,但我们的模型表明其他机制是活跃的,这一发现得到了实验中基体开裂与纤维断裂断裂的 SEM 观察的支持。

更新日期:2021-08-27
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