Analysis of Shape Memory Polymer-Alloy Composites: Modeling and Parametric Studies
1
Citation
12
Reference
10
Related Paper
Citation Trend
Abstract:
Shape memory composites (SMCs) based on shape memory alloys (SMAs) and shape memory polymers (SMPs) are interesting due to their controllable temperature-dependent mechanical properties. The complementary characteristics of SMAs and SMPs can be used to create materials or systems with shape recovery created by the SMA and shape fixity provided by the SMP. In this research, three SMC operating regimes are identified and the behavior of SMC structures is analyzed by focusing on composite fixity and interfacial stresses. Analytical models show that certain SMPs can achieve sufficient shape fixing. COMSOL Multi-Physics simulations are in agreement with analytical expressions for shape fixity and interfacial stresses. Analytical models are developed for an end-coupled linear SMP-SMA two-way actuation system.Keywords:
Shape-memory polymer
Superelasticity is one of the most important properties of shape memory alloy(SMA).Considering the advantages of steel strands in mechanical properties,a new form of SMA wires — SMA strands,is proposed,which can be applied to concrete members.The superelastic mechanical properties,such as stress-induced martensite phase transformation stress,residual strain,maximum phase transition strain and damping properties,of the SMAs in both the ordinary SMA wires and the strands are compared with respect to strain amplitude and cyclic number.By analyzing the test results,a conclusion can be drawn that the mechanical properties of the SMA strands are better than those of the SMA wires.The form of SMA is suggested as an influencing factor of the superelastic mechanical properties.
Pseudoelasticity
Diffusionless transformation
Nickel titanium
Cite
Citations (0)
The purpose of this research is to clarify basic mechanical properties and shape memory properties of Fe based shape memory alloy (SMA). In this study, we performed the tensile tests under room temperature to Fe based SMA and observed the shape recovery behavior. In this paper, the obtained results are shown and discussed.
Experimental research
Cite
Citations (0)
The mechanical characteristic of shape memory alloys (SMAs) is generally discussed, classifying it into the superelasticity and the shape memory effect. In the present study, the three-dimensional finite element method previously developed for the superelastic behavior of SMA devices by the authors has been extended to the geometrically nonlinear analysis and applied to the analysis on the shape memory effect of a SMA bar, a SMA column and a SMA honeycomb core structure. The calculated results are qualitatively reasonable and have corresponded well in part with the experimental results in the literatures. Better identifications of the material constants and the initial imperfections are necessary in order to increase the accuracy of the calculated solutions.
Pseudoelasticity
Bar (unit)
Cite
Citations (0)
Phenomenological modeling on the thermomechanical behavior of shape memory alloy (SMA) plates with two-way shape memory effect (TWSME) is presented in this paper. Two important characteristics of SMA materials as sensors or actuators; the thermal responses and the transformation accompanied deformation; are described by the proposed models. The latent heat effect during transformation is approximately expressed by an apparent specific heat as a function of transformation temperatures. The transformation-induced deformation of SMA plates is described by newly defined transformation expansion coefficients, based on the physical understanding of the mechanism of TWSME. The proposed model is verified by the comparison between numerical simulation and experiments on the thermomechanical behavior of SMA plates.
Phenomenological model
Diffusionless transformation
Thermomechanical analysis
Cite
Citations (15)
Pseudoelasticity
Smart material
Cite
Citations (707)
Our article deals with the possibility of using shape memory material (SMA − Shape Memory Alloy) to create an actuator of the mechanical element. The biggest advantage of the SMA actuators compared to those made of conventional materials is that they have the ability to generate relatively great force, are of low weight and small size.
Cite
Citations (2)
Shape memory alloys (SMA) are materials that have the ability to return to a former shape when subjected to an appropriate thermomechanical procedure. Pseudoelastic and shape memory effects are some of the behaviors presented by these alloys. The unique properties concerning these alloys have encouraged many investigators to look for applications of SMA in different fields of human knowledge. The purpose of this review article is to present a brief discussion of the thermomechanical behavior of SMA and to describe their most promising applications in the biomedical area. These include cardiovascular and orthopedic uses, and surgical instruments.
Pseudoelasticity
Cite
Citations (497)
A modified phenomenological model for Shape Memory Alloy (SMA) is presented for design of an SMA wire based rotatory actuator. In this model, the forward and reverse transformation functions are derived from two kinds of tests: standard tension test, carried out at constant temperature, and thermal cyclic test under constant force. This model is verified by the measured behavior of NiTi SMA wire. The analytical result by this model agrees well with the measured performance of an NiTi SMA wire based actuator.
Nickel titanium
Tension (geology)
Constant (computer programming)
Cite
Citations (47)
Pseudoelasticity
Cite
Citations (0)
Shape memory alloy (SMA) has a good application prospect in structural vibration control due to its unique shape memory effect and superelasticity. First, the characteristics of SMA is briefly introduced. This paper then reviews research results on SMA for passive energy dissipation in the past decades, including development of different mechanisms of SMA-based passive devices and their performance tests and application research. Finally, application of SMA for passive energy dissipation is prospected.
Pseudoelasticity
Cite
Citations (4)