A diffusion, oxidation reaction and large viscoelastic deformation coupled model with applications to SiC fiber oxidation

Yunong Zhao, Yanfei Chen, Shigang Ai*, Daining Fang

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

31 引用 (Scopus)

摘要

In this paper, we present a continuum-level thermodynamically consistent oxidation model that couples large viscoelastic deformation, diffusion and oxidation reaction. Constitutive equations are derived by means of the free energy inequality. The Eyring model for the shear stress dependence of viscosity is adopted to describe the viscous deformation. Subsequently, this model is applied to study the oxidation processes of SiC fibers. A sharp interface between the oxide and substrate naturally develops and propagates forward during the oxidation process. Furthermore, the stresses at the outer surface change from the initial compressive state to tensile due to the viscous deformation and significant volumetric swelling at the interface, which may explain the surface cracking observed in experiments. Notably, the present model can be conveniently used to simulate the oxidation processes that involve complex geometrical shapes without the need to mark and track the interface artificially.

源语言英语
页(从-至)173-189
页数17
期刊International Journal of Plasticity
118
DOI
出版状态已出版 - 2019

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Zhao, Y., Chen, Y., Ai, S., & Fang, D. (2019). A diffusion, oxidation reaction and large viscoelastic deformation coupled model with applications to SiC fiber oxidation. International Journal of Plasticity, 118, 173-189. https://doi.org/10.1016/j.ijplas.2019.02.003