Damage Evolution Due to Extremely Low-Cycle Fatigue for Inconel 718 Alloy

被引:11
|
作者
Algarni, Mohammed [1 ]
Bai, Yuanli [2 ]
Zwawi, Mohammed [1 ]
Ghazali, Sami [3 ]
机构
[1] King Abdulaziz Univ, Fac Engn, Mech Engn Dept, POB 344, Rabigh 21911, Saudi Arabia
[2] Univ Cent Florida, Dept Mech & Aerosp Engn, 4000 Cent Florida Blvd, Orlando, FL 32816 USA
[3] Univ Jeddah, Fac Engn, Mech & Mat Engn Dept, Jeddah 23890, Saudi Arabia
关键词
extremely low-cycle fatigue (ELCF); nonlinear damage evolution; Lode angle; Inconel; 718; alloy; stress triaxiality; multiaxial stress state; STRESS TRIAXIALITY; DUCTILE FRACTURE; MODEL; STRAIN; CRITERION; GROWTH;
D O I
10.3390/met9101109
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper evaluates the damage evolution process under extremely low-cycle fatigue (ELCF). The study explores the damage behavior under different stress states. The influence of the multiaxial state of stress on the metal's life is determined. Two different stress states were examined: (a) axisymmetric and (b) plane-strain. The study is based on the modified Mohr-Coulomb (MMC) ductile fracture criterion that was extended to cover the ELCF regime in a previous research study. Four distinctive geometries are designed to study the effect of different stress states on ELCF life and damage evolution. The damage model is calibrated for life prediction to agree with the ELCF experimental results. The investigation of the damage evolution behavior is dependent on equivalent plastic strain, stress triaxiality, Lode angle, and cyclic loading effect. The damage evolution is extracted from Abaqus finite element simulations and plotted versus the equivalent plastic strain. The damage accumulation shows nonlinear evolution behavior under cyclic loading conditions. SEM images were taken to further study the microscopic failure mechanisms of ELCF.
引用
收藏
页数:18
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