Defect-induced asymmetrical mechanical behavior in shape memory zirconia: A phase-field investigation |
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| Affiliation: | 1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei Province, PR China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, 1037 Luoyu Road, Wuhan 430074, PR China;1. Department of Mechanical Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO, USA;2. Department of Mechanical Engineering, Oklahoma State University, 201 GAB, Stillwater, OK, USA;3. Pacific Northwest National Laboratory, 906 Battelle Boulevard, Richland, WA, USA;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei Province, PR China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, 1037 Luoyu Road, Wuhan 430074, PR China;3. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Nanyang Avenue, Singapore;1. Micron School of Materials Science and Engineering, Boise State University, Boise, USA;2. Department of Mechanical and Biomedical Engineering, Boise State University, Boise, USA |
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| Abstract: | An elastoplastic phase-field model is used to investigate the deformation mechanisms of yttria stabilized tetragonal zirconia in presence of defects. A remarkable tension-compression asymmetry is detected. A higher strength and a lower degree of transformation are observed in compression than in tension. Also, deformation mechanism is asymmetric depending on the crystal orientation. For some cases (other cases), phase transformation is absent in tension (in compression), while both transformation and plasticity are present in compression (in tension). Such tension-compression asymmetry is attributed to activation of different monoclinic variants with different Eigen strain tensors in tension versus compression. Results also reveal a higher degree of transformation and plasticity with lower onset stresses as the void size increases. Elliptic voids exhibit a directional effect with a maximum stress intensity factor of 5.6 MPa m1/2 when the long semi-axis is diagonally oriented with respect to the loading direction, and this prediction is comparable to experiments. |
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| Keywords: | Shape memory ceramics Zirconia Defects Phase-field modeling Plasticity |
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