A cohesive zone model for fatigue and creep-fatigue crack growth in single crystal superalloys

被引:121
作者
Bouvard, J. L. [1 ]
Chaboche, J. L. [2 ]
Feyel, F. [2 ]
Gallerneau, F. [2 ]
机构
[1] Mississippi State Univ, Ctr Adv Vehicular Syst, Mississippi State, MS 39762 USA
[2] Off Natl Etud & Rech Aerosp, Dept Met Mat & Struct, FR-92322 Chatillon, France
关键词
Fatigue crack growth; Cohesive zone model; Single crystal; Creep-fatigue regime; FINITE-ELEMENT-ANALYSIS; LOW-CYCLE FATIGUE; DAMAGE THEORY; FRACTURE;
D O I
10.1016/j.ijfatigue.2008.11.002
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A numerical analysis using cohesive zone model under cyclic loading is proposed to develop a coupled predictive approach of crack growth in single crystal. The process of material damage during fatigue crack growth is described using an irreversible cohesive zone model, which governs the separation of the crack flanks and eventually leads to the formation of free surfaces. The cohesive zone element is modeled to accumulate fatigue damage during loadings and no damage during unloadings. This paper presents the damage model and its application in the study of the crack growth for precracked specimens. The use of cohesive zone approach is validated through a convergence study. Then, a general procedure of parameters calibration is presented in pure fatigue crack growth. In the last section, an extension of the cohesive zone model is presented in the case of creep-fatigue regime at high temperature. The model showed its capability to predict with a good agreement the crack growth in the case of complex loading and complex specimen geometries. (C) 2008 Elsevier Ltd. All rights reserved.
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页码:868 / 879
页数:12
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