Academic Journal
Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling.
| Τίτλος: | Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling. |
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| Συγγραφείς: | Chen, Xiang1 (AUTHOR), Zou, Weiqian1 (AUTHOR), Pu, Junran1 (AUTHOR), Qu, Yongzheng1 (AUTHOR), Kang, Xi1 (AUTHOR) kangxi@cqupt.edu.cn, Zhao, Yang1 (AUTHOR) |
| Πηγή: | Phase Transitions. Aug2026, p1-22. 22p. 10 Illustrations. |
| Θεματικοί όροι: | *Shape memory alloys, *Material plasticity, *Mechanical behavior of materials, *Stress-strain curves, *Martensitic transformations, *Energy dissipation |
| Περίληψη: | A constitutive model coupling martensitic transformation and plastic deformation was implemented as a UMAT in ABAQUS to simulate spherical indentation of NiTi shape memory alloys. Four material states—superelastic (SE), superelastic with plasticity (SE-P), shape memory effect (SME), and SME with plasticity (SME-P)—were compared under identical elastic modulus, transformation stress, and strain conditions. Plasticity reduces depth recovery, increases hysteresis energy dissipation, and shrinks the effective transformation zone. In SE/SE-P, unloading begins elastically and subsequent inflection points are governed by reverse transformation. In SME/SME-P, reverse transformation does not occur during unloading; heating enables additional recovery, while residual indentation remains with plastic deformation. The model also reproduces the experimentally observed decrease in reverse-transformation stress with increasing tensile pre-strain. It provides a continuum-averaged description of indentation recovery, while grain-scale heterogeneity, dislocation structures, surface oxide, and roughness require further investigation. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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