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• W2796657286 abstract "Porous NiTi shape memory alloys have applications in the biomedical and aerospace fields. Recent developments in metal additive manufacturing have made fabrication of near-net-shape porous products with complicated geometries feasible. There have also been developments in tailoring site-specific microstructures in metals using additive manufacturing. Inspired by these developments, we explore two related mechanistic phenomena in a simplified representation of porous shape memory alloys. First, we computationally elucidate the connection between pore geometry, stress concentration around pores, grain orientation, and strain-band formation during tensile loading of NiTi. Using this, we present a method to engineer local crystal orientations to mitigate the stress concentrations around the pores. Second, we experimentally document the growth of cracks around pores in a cyclically loaded superelastic NiTi specimen. In the areas of stress concentration around holes, cracks are seen to grow in large grains with [1 1 0] oriented along the tensile axis. This combined work shows the potential of local microstructural engineering in reducing stress concentration and increasing resistance to propagation of cracks in porous SMAs, potentially increasing the fatigue life of porous SMA components." @default.
• W2796657286 created "2018-04-24" @default.
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• W2796657286 date "2018-04-12" @default.
• W2796657286 modified "2023-10-16" @default.
• W2796657286 title "Influence of Structure and Microstructure on Deformation Localization and Crack Growth in NiTi Shape Memory Alloys" @default.
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• W2796657286 doi "https://doi.org/10.1007/s40830-018-0172-1" @default.
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