20.500.12556/RUL-168394 A novel asymmetric function to improve tension-compression asymmetry and torsion response and its implementation to Auricchio-Petrini model for shape memory alloys The behavior of shape memory alloys exhibits significant asymmetry under tension, compression, and torsion, posing challenges for accurate modeling in engineering applications. This study introduces a novel approach to improve constitutive models by incorporating an asymmetric function that enables independent parameter definitions for tension, compression, and torsion. This innovation allows material parameters to be determined directly from stress-strain data, enhancing model flexibility and practicality. The proposed method is implemented in the widely used Auricchio-Petrini model, extending its capabilities to capture asymmetry in transformation start stress, hysteresis width, transformation plateau length, and hardening slope, all while maintaining thermomechanical consistency. In the proposed material model, the elastic modulus is differentiated for austenite, multi-variant martensite, and single-variant martensite, with the latter exhibiting an introduced asymmetry. The model also incorporates improved temperature dependency. Validation through comparisons with experimental data demonstrate the model's effectiveness in predicting SMA behavior under diverse proportional and non-proportional loading conditions, including superelasticity and shape memory effects. shape memory alloys SMAs constitutive modeling tension-compression asymmetry asymmetric function Auricchio-Petrini model finite element simulations superelasticity shape memory effect true false true Angleški jezik Ni določen Članek v reviji 2025-04-11 10:54:38 2025-04-11 10:54:43 2025-04-16 13:26:14 0000-00-00 00:00:00 2025 0 0 21 str. Vol. 112, art. 105650 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.174:539.3 0997-7538 10.1016/j.euromechsol.2025.105650 232261891 Roblek_..._A_novel_asymmetric_function.pdf Roblek_..._A_novel_asymmetric_function.pdf 1 62990B89E448C58DC665B753A5719D6C a036a4bc0c6d62448f5810b2e9b20103b625f45864e408a736824566829fac12 86d75e3d-16b2-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201779 https://www.sciencedirect.com/science/article/pii/S0997753825000841 1 848faeda-16b1-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201778 Fakulteta za strojništvo Fakulteta za gradbeništvo in geodezijo 0 0 0