Journal ArticleDOI
One-Dimensional Thermomechanical Constitutive Relations for Shape Memory Materials
Chen Liang,Craig A. Rogers +1 more
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TLDR
In this article, a complete, unified, one-dimensional constitutive model of shape memory materials is developed and presented in the form of a thermomechanical model for shape memory alloys.Abstract:
The use of the thermoelastic martensitic transformation and its reverse transformation has recently been proposed and demonstrated for several active control ap plications. However, the present constitutive models have lacked several important funda mental concepts that are essential for many of the proposed intelligent material system ap plications such as shape memory hybrid composites.A complete, unified, one-dimensional constitutive model of shape memory materials is developed and presented in this paper. The thermomechanical model formulation herein will investigate important material characteristics involved with the internal phase transformation of shape memory alloys. These characteristics include energy dissipation in the material that governs the damping behavior, stress-strain-temperature relations for pseudoelasticity, and the shape memory effect. Some numerical examples using the model are also presented.read more
Citations
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Journal ArticleDOI
Mechanical Behaviors of Torsion Actuator of Shape Memory Alloy
TL;DR: In this article, a shape memory alloy (SMA) torsion actuator is designed by using SMA wires and a thin-walled tube, and a mechanical model is developed based on the knowledge of solid mechanics and constitutive relation of SMA.
Journal ArticleDOI
Experimental study and life prediction on fatigue failure of NiTi shape memory alloy under multi-axial one-way shape memory cyclic loadings
TL;DR: In this paper, the thermo-mechanical coupling fatigue experiments of NiTi shape memory alloy (SMA) micro-tubes involving one-way shape memory effect (OWSME) are first carried out under the uniaxial and multi-axial stress-controlled cyclic loadings with some specific loading paths and stress levels.
Proceedings ArticleDOI
Stress-induced tuning of ultrasonic additive manufacturing Al-NiTi composites
Ryan Hahnlen,Marcelo J. Dapino +1 more
TL;DR: In this article, an active metal-matrix composites manufactured by Ultrasonic Additive Manufacturing (UAM) was used to create composites with aluminum matrices and embedded NiTi ribbons.
Proceedings ArticleDOI
Optimal control of multi-input SMA actuator arrays using graph theory
TL;DR: The control of NAA actuators systems as a graph theory problem is formulates, and the ability of search algorithms to optimize a weighted combination of speed and energy usage, while minimizing computational cost is characterized.
Proceedings ArticleDOI
Bistable morphing composites with selectively pre-stressed laminae
TL;DR: In this paper, the authors presented an equivalent laminated composite in which mechanical prestress is applied to the matrix of selected laminae to achieve bistability; shapes are tailored individually by changing the magnitude of prestress in each lamina.
References
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Journal ArticleDOI
Thermoelasticity, pseudoelasticity and the memory effects associated with martensitic transformations
TL;DR: In this paper, the pertinent thermodynamic relations, nucleation and growth and the influence of stress are considered and applied to thermoelasticity and the memory effects, and the effects of stress on memory are investigated.
Journal ArticleDOI
A thermomechanical description of materials with internal variables in the process of phase transitions
K. Tanaka,S. Nagaki +1 more
TL;DR: In this article, a model for thermoplastic materials in the process of solid-solid phase transition is presented, where the material is characterized by three different internal state variables: two internal variables which specify the crystallographic structural change during the plastic deformation, and a set of scalar internal variables describing the extent of phase transition.
Journal ArticleDOI
Some Applications of Shape-Memory Alloys
TL;DR: In this article, the shape memory effect and other interesting properties of shape memory alloys are discussed after a brief discussion of the nature of the shape-memory effect and some interesting properties.