Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"pseudoelastic"”.
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On the thermomechanics of localizing pseudoelastic transformations in NiTi materials and structures
… are recovered during the reverse transformation (pseudoelasticity). In a structure, the transformations occur inhomogeneously with two deformation regimes coexisting, separated by sharp fronts. Moreover, latent heat is released/absorbed at the fronts causing temperature gradients which can affect …
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Constitutive modeling and finite element analysis of the dynamic behavior of shape memory alloys
… experimental observations have shown that the pseudoelastic response of NiTi shape memory alloys (SMA) is localized in nature and proceeds through nucleation and propagation of localized deformation bands. It has also been observed that the mechanical response of SMAs is strongly affected by …
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Effects of Wire Material, Deflection, and Interbracket Distance on Burstone Bracket Geometry Force Systems
… problem, especially with phase transforming pseudoelastic wires. In clinical situations, where one is attempting to create or predict the force system on brackets, these data should be taken into consideration, especially to avoid inconsistent force systems.</p>
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A Novel Shape Memory Behavior of Single-crystalline Metal Nanowires
… are used. A novel shape memory effect and pseudoelastic behavior of single-crystalline FCC metal (Cu, Ni, and Au) nanowires are discovered. Specifically, upon tensile loading and unloading, these wires can recover elongations of up to 50%, well beyond the recoverable strains of 5-8% typical …
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Characterization of Stoichiometric and Aging Effects on NiTiHf High Temperature Shape Memory Alloys
… high transformation temperature, stable pseudoelastic (PE) behavior, and very small irrecoverable strain during load biased tests. The addition of Hf is more attractive than Pt and Pd due to the fact that Hf has a lower cost. Four NiTiHf alloys with different chemical compositions …
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Critical stresses for twinning, slip and transformation in shape memory alloys: modeling and experiments
… alloys with D03 austenite structures exhibit pseudoelasticity due to reversible slips and twinning-detwinning mechanisms upon loading and unloading. The advantage of these alloys compared to transforming shape memory alloys is the potentially large pseudoelastic temperature range. Reversible …
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Performance of Steel Braced Frame Reinforced with Shape Memory Alloy Wires
Shape memory alloys have just recently made their way into structural design, and through studies have proved to be quite effective in increasing a structure’s strength and performance. This thesis focuses on the research performed on concentrically braced steel frames reinforced with …