Interface delamination vs. bulk cracking along wavy interfaces

Sehr, Stephen; Amidi, Shahrooz; Begley, Matthew R.

doi:10.1016/j.engfracmech.2018.10.031

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…This includes the future incorporation of existing cohesive element frameworks to simulate fracture. (e.g., 5,6 ) In addition, this approach exploits the speed of highly optimized, open-sourced auto-matic meshing algorithms for triangular elements that offer highly adaptable spatial resolution and easily handle significant changes in the geometry. 22,23 The need to iteratively solve for creep relaxation that occurs over an increment in growth implies the fact that the costs of re-meshing are negligible.…”

Section: Overview Of the Framework And Computational Workflowmentioning

confidence: 99%

“…3,4 , the current approach has the benefit of straightforward coding that can be easily adapted to various constitutive descriptions of oxidation and creep and facile integration with existing cohesive zone frameworks for simulating fracture. 5,6 The two physical models that form the core of the simulation framework are: (i) an oxide growth model that represents a generalization of the Deal-Grove model, 7 wherein the flux of oxidant arriving at the oxide/SiC interface dictates the interface velocity, and (ii) a nonlinear, Eyring-type creep description of the oxide. 8 These are described in Section 2, along with an analytical solution for the stresses in a flat, growing oxide film that integrates both models.…”

Section: Introductionmentioning

confidence: 99%

“…While naturally there are numerous alternatives (e.g 3,4 ,. the current approach has the benefit of straightforward coding that can be easily adapted to various constitutive descriptions of oxidation and creep and facile integration with existing cohesive zone frameworks for simulating fracture 5,6 …”

Section: Introductionmentioning

confidence: 99%

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An integrated analysis of transport, oxidation, and creep during oxidation of interior pores in SiC

et al. 2023

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Oxidation of SiC plays a critical role in the durability of ceramic matrix composites, as large changes in molar volume generate significant stresses that can drive cracking in adjacent features. The analysis of such phenomena requires coupling between descriptions of diffusion through the oxide, growth of the oxide domain (i.e., evolution of the oxide/SiC interface), and creep relaxation in the oxide at elevated temperatures. This paper presents a two‐dimensional finite element framework that uses a single finite element mesh to predict these behaviors; large changes in the oxide geometry are simulated by tracking the oxidation front as a discrete interface and periodically re‐meshing. The numerical performance of the framework is illustrated using an analytical description of oxidation of a flat surface and subsequent stress evolution. The framework is then used to analyze internal oxidation within a cylindrical cavity for a wide range of temperatures and water vapor concentrations pertinent to gas turbines. The results are used to discuss the roles of oxide growth rate, creep, and geometry with respect to the tensile stresses that develop in the adjacent SiC, and their implications for oxidation‐driven damage at high temperatures.

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