Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 103, Issue -, Pages 436-443Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2017.06.031
Keywords
Fatigue life; Local stress approach; Equivalent damage life; Different temperatures; U-notched plate
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In this paper, the fatigue lives of U-notched polymethyl methacrylate (PMMA) plate at different temperatures are numerically investigated on the basis of local stress approach. First, a local stress approach for fatigue damage at the U-notch is presented based on the principle of equivalent damage life. Second, the strength and stiffness degeneration criterions during the fatigue process are established to take account of the nonlinear cumulative fatigue damage. Finally, the commercial software ABAQUS is employed to predict the fatigue S-N curves of the U-notched PMMA plate at various constant temperatures of -55 degrees C, 23 degrees C and 60 degrees C using a user-defined material (UMAT) subroutine. The numerical results of the fatigue life are in good agreements with the experimental data, which verify the effectiveness of the local stress approach. (C) 2017 Elsevier Ltd. All rights reserved.
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