1 State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, China 2 Aircraft Strength Research Institute of China, Xi'an 710065, China 3 Beijing Institute of Aeronautical Materials, Beijing 100095, China
The relationships between the stress concentration factor Kt with the depth h and diameter φ of the blind hole were investigated based on the FEM. The thermo-elastic analysis mode (E-Mode) built-in the lock-in thermography was utilized to study the stress distribution around the blind hole, and to predict the variation of Kt of different depth. Good predictions were achieved between the thermography and FEM. The variations of the intrinsic dissipation and the temperature signal during fatigue process were studied respectively using the dissipation mode (D-Mode) of Altair Li and Altair software, to evaluate fatigue damage evolution. These two signals were considered as fatigue damage markers to rapidly predict the fatigue limit and the fatigue notch factor Kf of the component with blind hole. The theoretical result validates the capability of the lock-in thermography.
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Jun-ling FAN, Qiang GUO, Yan-guang ZHAO, Xing-lin GUO. Stress Analysis and Fatigue Behavior Assessment of Components with Defect Based on FEM and Lock-in Thermography. Journal of Materials Engineering, 2015, 43(8): 62-71.
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