Abstract The manuscript presents a novel reduced order homogenization model for oxidation-assisted rupture in SiC/SiC composites at intermediate temperatures. Starting with a one-dimensional model based on the slow crack growth model originally proposed by Iyengar and Curtin, which is subsequently generalized to three dimensions focusing on the woven composite architecture. The proposed oxidation-assisted rupture model is developed within the framework of continuum damage mechanics where the constitutive equation in the axial tow direction is governed by the continuum damage mechanics variant of the slow crack-growth model and the availability of oxygen to fibers, which in turn depends on the initial matrix pores and subsequent matrix cracking. The constitutive model in the transverse tow directions as well as in the matrix phase outside the tows is assumed to obey a time-independent orthotropic continuum damage mechanics model, but the time-dependent nature of the axial tow model, inevitably causes the time-dependent redistribution of damage in all directions and phases. The reduced order homogenization approach that provides an efficient framework for computing overall composite behavior is employed for model reduction. Numerical validation studies are conducted on the eight-harness weave architecture.

中文翻译：

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陶瓷基复合材料氧化辅助断裂的计算模型

摘要 该手稿提出了一种用于 SiC/SiC 复合材料在中间温度下氧化辅助断裂的新型降阶均质化模型。从基于最初由 Iyengar 和 Curtin 提出的缓慢裂纹扩展模型的一维模型开始，随后将其推广到专注于编织复合结构的三个维度。所提出的氧化辅助破裂模型是在连续损伤力学的框架内发展起来的，其中轴向拖曳方向的本构方程由缓慢裂纹增长模型的连续损伤力学变体和氧气对纤维的可用性控制，其中转向取决于初始基体孔隙和随后的基体开裂。假定横向拖曳方向以及拖曳外侧基体相的本构模型服从与时间无关的正交各向异性连续介质损伤力学模型，但轴向拖曳模型的时间相关性不可避免地导致时间相关在所有方向和阶段重新分配损害。为计算整体复合行为提供有效框架的降阶同质化方法用于模型简化。对八线编织架构进行了数值验证研究。为计算整体复合行为提供有效框架的降阶同质化方法用于模型简化。对八线编织架构进行了数值验证研究。为计算整体复合行为提供有效框架的降阶同质化方法用于模型简化。对八线编织架构进行了数值验证研究。