20.500.12556/RUL-169973 Towards reliable Ni-Ti components tribological insights and fatigue behaviour under cyclic compressive loads Shape memory alloys (SMAs) under compressive loading have attracted interest due to the improved fatigue life compared to tension, offering significant advantages in applications such as elastocaloric cooling, actuators, and dampers. However, compression-induced buckling in SMAs necessitates the use of supporting structures (holders), creating tribological contacts that can lead to wear and premature failure. In this study, we have systematically investigated the wear behaviour of pseudoelastic Ni-Ti tubes in contact with various holder materials, including metals (hardened steel, bronze), ceramics (Al▫$_2$▫O▫$_3$▫, ZrO▫$_2$▫), and polymer (Oilon), under cyclic compressive loading exceeding 1×106 cycles. While all Ni-Ti samples reached run-out, significant surface cracking was observed in most tubes, except when using Oilon supports. Numerical analysis predicted fretting wear due to multi-axial stress distribution at holder edges, while additional tribological tests further evaluated wear behaviour and coefficients of friction. Oilon supports provided the best overall performance, minimizing wear while maintaining buckling integrity of Ni-Ti tubes. In contrast, steel supports caused the highest degree of Ni-Ti wear and were highly fit-dependent. Softer metals, such as brass and bronze, exhibited excessive total wear, while ceramics showed promising characteristics but were limited by their brittleness when interacting with high-strain material like SMA. These results highlight that fretting wear- and possibly fretting fatigue intrinsically occurs during extended operation of pseudoelastic Ni-Ti components in contact with metallic or ceramic materials, while wear is exacerbated by increased relative motion. This work provides insights for optimizing material pairings in practical SMA applications not limited to compressive loading or tubular design. shape memory alloy NiTi wear fatigue zlitine z oblikovnim spominom NiTi obraba utrujanje true false false Angleški jezik Slovenski jezik Članek v reviji 2025-06-30 09:21:31 2025-06-30 09:21:40 2025-07-01 03:55:47 0000-00-00 00:00:00 2025 0 0 21 str. art. 109766 Vol. 179 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621 1873-1961 10.1016/j.engfailanal.2025.109766 240662275 RAZ_Cerar_Jan_2025.pdf RAZ_Cerar_Jan_2025.pdf 1 6D33B6B11FEF4DB7C005B915959070B9 bb182b9c609e694c0755ba58cbe4081110a0d3241b139dcd4d5bf012596886e3 2bd06083-5581-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=211854 https://www.sciencedirect.com/science/article/pii/S1350630725005072?via%3Dihub 1 faaa32cb-5580-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=211853 Fakulteta za strojništvo 0 0 0