期刊
THEORETICAL AND APPLIED FRACTURE MECHANICS
卷 108, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.tafmec.2020.102624
关键词
Nickel-base single crystal superalloy; Fatigue life evaluation; Multiaxial damage parameter; Topologized resolved shear stress
资金
- National Science and Technology Major Project [2017-VI-00030073]
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 degrees 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.
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