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
Tracking and Vibration Control of Flexible Robots Using Shape Memory Alloys
TL;DR: In this paper, the tracking control problem for flexible robots with active vibration suppression by shape memory alloys (SMAs) is considered, and the flexible modes and joint angles are modeled as fast and slow variables, respectively.
Journal ArticleDOI
Transformation start stress in non-textured shape memory alloys
X Y Gao,Weimin Huang +1 more
TL;DR: Yield surfaces of shape memory alloys (SMAs) were investigated in this article using a modified micro-mechanical model based on the assumption that the driving energy for transformation is approximately a constant.
Proceedings ArticleDOI
Phenomenological modeling of induced transformation anisotropy in shape memory alloy actuators
TL;DR: In this paper, a constant back stress tensor is introduced into the model, which is implemented in an exact form for simple tension/torsion loading as well as into a commercial finite element code to perform a 3D analysis of a Shape Memory Alloy (SMA) torque tube actuator subjected to different loading schemes.
Journal ArticleDOI
Shape memory alloy–actuated prestressed composites with application to morphing automotive fender skirts:
Venkata Siva C. Chillara,Leon M. Headings,Tsuruta Ryohei,Eiji Itakura,Umesh N. Gandhi,Marcelo J. Dapino +5 more
TL;DR: In this paper, smart laminated composites that enable morphing vehicle structures are presented, for example, adaptive fender skirts and adaptive front bumper skirts, which can be effective for drag reduction.
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.