Large crack tip deformations and plastic crack advance during fatigue |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan city 70101, Taiwan;2. Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, Tainan city 70101, Taiwan;3. Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan city 70101, Taiwan;4. National Synchrotron Radiation Research Center, Hsinchu city 30076, Taiwan |
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| Abstract: | Finite-deformation elastoplastic analysis of a crack subjected to mode I cyclic loading under small scale yielding was performed. The influence of the load range, load ratio and overload on the crack tip deformations is presented. Cyclic crack tip opening displacements agreed with predictions of simpler models, where available. Crack closure was not detected. Plastic crack advance was evidenced. Its rate per cycle reproduced common trends of the fatigue cracking dependence on loading range and overload. |
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