Experimental and numerical assessment of the characteristics describing superelasticity in shape memory alloys – influence of boundary conditions
Jakub Bryła,Adam Martowicz +1 more
- 01 Jan 2017
- Vol. 15, pp 06007
TL;DR: In this paper, the authors make an attempt at qualitative analysis of the material properties for superelasticity of shape memory alloys (SMA) and make use of static stretching tests to assess the influence of the above stated boundary conditions on the properties of selected types of SMA, using both experimental and numerical results.
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Abstract: Relatively recent discovery of shape memory alloys (SMA) justifies ongoing research on their properties and an attempt to explain the physical phenomenon responsible for the characteristic behaviour of SMA. Moreover, there have been reported many successful commercial SMA applications to medical cases, mostly based on superelasticity. Even though a wide application range is confirmed, its further contribution growth is currently not seen - mostly due to deficiency of reliable modelling techniques. Recently, lively discussion in the SMA academic community is observed, which deals with modelling issues and numerical implementation.Considering the current trends, the authors of the work make an attempt at qualitative analysis of the material properties for superelasticity. The material characteristics – found using static stretching tests – are sensitive to the variation of local stresses induced in the area where a SMA sample is mounted in a fatigue testing machine. As shown, the phenomena present at the clamping area seem to initiate and govern the process of the solid phase transformation within the entire SMA body. The overall objective of the presented research is to assess the influence of the above stated boundary conditions on the properties of selected types of SMA, using both experimental and numerical results.
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Citations
Nonlocal elasticity in shape memory alloys modeled using peridynamics for solving dynamic problems
TL;DR: A particular focus is placed on the available structural stiffness control functionality in mechanical systems equipped with SMA and efficiency of energy dissipation in SMA-based dampers, which may be effectively applied to suppress mechanical vibrations.
References
Shape Memory Alloys
T. Tadaki,K. Otsuka,K. Shimizu +2 more
TL;DR: Otsuka et al. as mentioned in this paper showed a one-to-one correspondence between shape memory effect and the thermoelastic martensitic transformation in a Cu-AI-Ni alloy.
1.5K
Shape memory alloys, Part II: Modeling of polycrystals
Dimitris C. Lagoudas,Pavlin B. Entchev,Peter Popov,Etienne Patoor,L. Catherine Brinson,Xiujie Gao +5 more
TL;DR: In this paper, the authors summarized work on the micromechanical modeling of polycrystalline shape memory alloys (SMAs) and compared the predictions of several models directly compared and correlated with experimental results.
356
A robust integration-algorithm for a finite-strain shape-memory-alloy superelastic model
TL;DR: In this article, the authors proposed an efficient and robust solution algorithm to be used during the design of SMA-based devices through the use of classical computational tools such as the finite element method.
211
•Book
Shape memory alloy engineering : for aerospace, structural and biomedical applications
Leonardo Lecce,Antonio Concilio +1 more
- 01 Jan 2014
TL;DR: Shape Memory Alloy Engineering introduces materials, mechanical, and aerospace engineers to shape memory alloys (SMAs), providing a unique perspective that combines fundamental theory with new approaches to design and modeling of actual SMAs as compact and inexpensive actuators for use in aerospace and other applications as discussed by the authors.
132
Numerical and Experimental Evaluation of the Damping Properties of Shape-Memory Alloys
TL;DR: In this paper, the authors compare two different uniaxial constitutive models for superelastic shape-memory alloys (SMAs) suitable to study the dependence of the stress-strain relationship on the loading-unloading rate.