Prediction of mixed-mode fracture based on an elasto–plastic energy balance criterion |
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Authors: | Li-Chun Bian Zouheir Fawaz Kamran Behdinan |
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Institution: | (1) Department of Aerospace Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada |
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Abstract: | The maximum energy release rate criterion, i.e., G
max
criterion, is commonly used for crack propagation analysis. This fracture criterion is based on the elastic macroscopic strength
of materials. In the present investigation, however, the G
max
criterion has been modified in order to accommodate the consideration of plastic strain energy. This modified criterion is
extended to study the fatigue crack growth characteristics of mixed-mode cracks. To predict crack propagation due to fatigue
loads, a new elasto–plastic energy model is presented. This new model includes the effects of material properties such as
strain hardening exponent n, yield strength σ
y
, and fracture toughness and stress intensity factor ranges. The results obtained are compared with those obtained using the
commonly employed crack growth law and the experimental data. |
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Keywords: | Fatigue Mixed mode Growth rate Energy release rate Stress intensity factor |
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