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A topologized resolved shear stress method for the life prediction of nickel-base single crystal superalloys

Authors :
Hui-Ji Shi
Peng Luo
Weixing Yao
Yichang Hua
Piao Li
Source :
Theoretical and Applied Fracture Mechanics. 108:102624
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

Fifteen multiaxial critical-plane fatigue damage parameters of isotropic metal materials are applied to the life evaluation of nickel-base single crystal superalloys. These parameters are classified into stress-, strain- and strain-energy parameters, and their predictive abilities are evaluated by 12 groups of single crystal fatigue data obtained from mainly an intermediate temperature range (500–760 °C) where the slip deformation is the main damage mode. The results show that the strain energy group exhibits the best fitting characteristics with correlation coefficients. A topologized resolved shear stress method (TRSS) considering the interaction of main slip systems is further proposed. The dispersion degree of resolved shear stress among the main slip systems is quantified by a dispersion factor, and the real driving capacity of resolved shear stress is amended according to the topology of driving force. The obtained results show that the proposed method has achieved an improvement of correlation ability.

Details

ISSN :
01678442
Volume :
108
Database :
OpenAIRE
Journal :
Theoretical and Applied Fracture Mechanics
Accession number :
edsair.doi...........c386db3da13e8ba3334446b17029b03b
Full Text :
https://doi.org/10.1016/j.tafmec.2020.102624