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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Modeling a shape memory alloy actuator using an evolvable recursive black-box and hybrid heuristic algorithms inspired based on the annual migration of salmons in nature
Alireza Fathi,Ahmad Mozaffari +1 more
TL;DR: Results reveal the promising potential of the evolvable frameworks for modeling the behavior of SMA as a complex real world engineering system.
Journal ArticleDOI
Adaptability of hybrid smart composite plate under low velocity impact
Jin-Ho Roh,Ji-Hwan Kim +1 more
TL;DR: In this article, an approach to the detection of the strains and optimization of shape memory alloys (SMA) under low velocity impact is presented. But, it is assumed that the sensor is mounted on the opposite side of the impact process, and SMA fibers are embedded within the layers of a composite plate.
Journal ArticleDOI
Neuro-fuzzy Modeling of Temperature- and Strain-rate-dependent Behavior of NiTi Shape Memory Alloys for Seismic Applications
TL;DR: In this article, a neuro-fuzzy model of superelastic NiTi shape memory alloy (SMA) wires for use in seismic applications is proposed, which employs strain, strain-rate, and temperature as input variables, and provides stress as single output.
Journal ArticleDOI
Design of Shape Memory Alloy Coil Spring Actuator for Improving Performance in Cyclic Actuation.
TL;DR: By designing the SMA coil spring to have large index (coil diameter/wire diameter) and pitch angle (LIP), cooling characteristics can be improved (increasing the actuation frequency) and large deformation can be obtained.
Journal ArticleDOI
Stable Walking Pattern for an SMA-Actuated Biped
TL;DR: In this paper, a walking pattern filter for shape-memory-alloy (SMA)-actuated biped robots is presented, which adapts the human motion such that an SMA biped robot maintains a stable walking pattern.
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.