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논문 기본 정보

자료유형
학술대회자료
저자정보
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2009년도 재료 및 파괴부문 춘계학술대회 논문집
발행연도
2009.4
수록면
339 - 344 (6page)

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초록· 키워드

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In this work, the nucleation and propagation of crack in thermally grown oxide (TGO) due to displacement instability of the surface groove in Fecralloy substrate, subjected to multiple thermo-mechanical loading cycles, has been studied using the finite element method. Assumptions and referring about the material properties are minimized for rigorous reality. Most of the material properties including TGO growth and yield strength for TGO and substrate are based on the results experimentally obtained in-house. The material property change method is employed to model TGO formation cycle by cycle, and the creep properties for constituent materials are also incorporated. Based on the finite element procedure developed by ourselves, double nodes at the same locations are placed along the interface of the potential crack initiation, and these nodes are tied together as one node at the location. The first simulation aims at identifying the node at which the stress exceeds the critical stress of TGO material, and then releasing the nodes to the target node ahead for modeling the crack propagation. The progress repeats many times until a through crack was initiated in TGO films. The result shows that the simulation can agree acceptably with the experiment and reproduce the initiation and propagation of crack in TGO increasingly.

목차

Abstract
1. Introduction
2. Finite Element Model
3. Results and Discussion
4. Conclusion
5. Acknowledgements
References

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UCI(KEPA) : I410-ECN-0101-2009-550-018668233