Design optimization of shape memory alloy structures

摘要: This thesis explores the possibilities of design optimization techniques for designing shape memory alloy structures. Shape alloys are materials which, after deformation, can recover their initial when heated. effect be used actuation. Emerging applications e.g. miniaturized medical instruments with embedded actuation, as well microsystem components. However, effective structures is a challenging task, due to complex material behavior and close relationship between geometry, electrical, thermal mechanical properties structure. In this thesis, various approaches developed combine algorithms computational modeling The focus on NiTi that exhibit R-phase/austenite transformation. Dedicated computationally efficient constitutive models formulated capture predict performance designs. considered include deterministic optimization, under bounded-but-unknown uncertainty, gradient-based topology optimization. Together they provide collection systematic generate well-performing Their applicability effectiveness evaluated by application studies realistic complexity, involving miniature grippers steerable catheters. expected great use future devices utilize