Issue |
MATEC Web Conf.
Volume 300, 2019
ICMFF12 - 12th International Conference on Multiaxial Fatigue and Fracture
|
|
---|---|---|
Article Number | 07003 | |
Number of page(s) | 8 | |
Section | High Temperature | |
DOI | https://doi.org/10.1051/matecconf/201930007003 | |
Published online | 02 December 2019 |
Creep Damage Evaluation using Uniaxial Miniature Specimens for Multiaxially Damaged Components
1
Department of Mechanical Engineering, Graduate School of Science and Engineering, Ritsumeikan University, Japan
2
Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, Japan
* Corresponding author: sakanem@se.ritsumei.ac.jp
This study discusses a method of evaluating multiaxial creep damage for high temperature components subjected to multiaxial creep damage utilizing a miniature creep testing. A new model of the damage evaluation is proposed based on a linear creep damage accumulation and von Mises equivalent stress being a measure of multiaxial creep damage. The model clearly indicates that conventional creep damage evaluation methods utilizing a unidirectional miniature creep testing give an unconservative estimate in some cases for multiaxially creep damaged components. To verify the appropriateness of the proposed model, multiaxial creep tests were performed using cruciform specimens of a Mod.9Cr-1Mo steel. Miniature specimens in two directions were machined from a pre-damaged cruciform specimen and the uniaxial creep rupture lifetimes of the miniature specimens demonstrate the validity of the proposed model.
© The Authors, published by EDP Sciences, 2019
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