Direct Writing of Three-Dimensional Macroporous Photonic Crystals on Pressure-Responsive Shape Memory Polymers

2015 ◽  
Vol 7 (42) ◽  
pp. 23650-23659 ◽  
Author(s):  
Yin Fang ◽  
Yongliang Ni ◽  
Sin-Yen Leo ◽  
Bingchen Wang ◽  
Vito Basile ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Shape Memory ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Direct Writing

Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

2021 ◽  
Author(s):  
Tianjiao Wang ◽  
Jun Zhao ◽  
Chuanxin Weng ◽  
Tong Wang ◽  
Yayun Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Practical Applications ◽  
External Stimuli ◽  
Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

Optical tuning of three-dimensional photonic crystals fabricated by femtosecond direct writing

2005 ◽  
Vol 87 (9) ◽  
pp. 091117 ◽  
Author(s):  
Dennis McPhail ◽  
Martin Straub ◽  
Min Gu
Keyword(s):  
Photonic Crystals ◽  
Three Dimensional ◽  
Direct Writing

Three-dimensional constitutive model for shape-memory polymers considering temperature-rate dependent behavior

2021 ◽  
Vol 30 (3) ◽  
pp. 035030
Author(s):  
Jinsu Kim ◽  
Seung-Yeol Jeon ◽  
Seokbin Hong ◽  
Yongsan An ◽  
Haedong Park ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Rate Dependent ◽  
Dependent Behavior ◽  
Temperature Rate

Optically Bistable Macroporous Photonic Crystals Enabled by Thermoresponsive Shape Memory Polymers

2015 ◽  
Vol 3 (11) ◽  
pp. 1509-1516 ◽  
Author(s):  
Yin Fang ◽  
Sin-Yen Leo ◽  
Yongliang Ni ◽  
Long Yu ◽  
Pengxu Qi ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Shape Memory ◽  
Shape Memory Polymers

A large deformation framework for shape memory polymers: Constitutive modeling and finite element implementation

2012 ◽  
Vol 24 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Mostafa Baghani ◽  
Reza Naghdabadi ◽  
Jamal Arghavani
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Shape Memory ◽  
Finite Deformation ◽  
Deformation Gradient ◽  
Strain Tensor ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Small Strain ◽  
Internal Variables

Shape memory polymers commonly experience both finite deformations and arbitrary thermomechanical loading conditions in engineering applications. This motivates the development of three-dimensional constitutive models within the finite deformation regime. In the present study, based on the principles of continuum thermodynamics with internal variables, a three-dimensional finite deformation phenomenological constitutive model is proposed taking its basis from the recent model in the small strain regime proposed by Baghani et al. (2012). In the constitutive model derivation, a multiplicative decomposition of the deformation gradient into elastic and inelastic stored parts (in each phase) is adopted. Moreover, employing the mixture rule, the Green–Lagrange strain tensor is related to the rubbery and glassy parts. In the constitutive model, the evolution laws for internal variables are derived during both cooling and heating thermomechanical loadings. Furthermore, we present the time-discrete form of the proposed constitutive model in the implicit form. Using the finite element method, we solve several boundary value problems, that is, tension and compression of bars and a three-dimensional beam made of shape memory polymers, and investigate the model capabilities as well as its numerical counterpart. The model is validated by comparing the predicted results with experimental data reported in the literature that shows a good agreement.

Micromechanical Modelling of Shape Memory Polymers

2008 ◽  
Vol 54 ◽  
pp. 137-142 ◽  
Author(s):  
Markus Böl ◽  
Stefanie Reese
Keyword(s):  
Shape Memory ◽  
Biomedical Applications ◽  
Three Dimensional ◽  
Coupled Model ◽  
Shape Memory Polymers ◽  
Material Behaviour ◽  
Thermomechanical Loading ◽  
Temperature Changes ◽  
Mechanical Interpretation ◽  
Biomedical Field

Shape memory materials represent a promising class of dual-shape materials that can move from one shape to another in response to a stimulus such as light, heat, electricity or magnetism. In this regard, the biomedical field is showing large interest in this class of materials, especially in shape memory polymers (SMPs), whose mechanical properties make them extremely attractive for many biomedical applications. However, diverse characteristics including also the mechanical behaviour are still part of research. In this contribution the shape memory properties of polymers will be quantified by cyclic thermomechanical investigations. One cycle includes the "programming" of the sample and the recovery of its permanent shape. To describe this phenomenon, a three-dimensional thermomechanical coupled model is proposed. This macromechanical constitutive model is based on the physical understanding of the material behaviour and a mechanical interpretation of the stress-strain-temperature changes observed during thermomechanical loading. The main focus of this work is the influence of both, the material constants and heat transfer boundary conditions on the response of shape memory polymers. Therefore we illustrate different general simulations as well as examples of application.

Chromogenic Photonic Crystals Enabled by Novel Vapor-Responsive Shape-Memory Polymers

2015 ◽  
Vol 27 (24) ◽  
pp. 3696-3704 ◽  
Author(s):  
Yin Fang ◽  
Yongliang Ni ◽  
Baeck Choi ◽  
Sin-Yen Leo ◽  
Jian Gao ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Shape Memory ◽  
Shape Memory Polymers

scholarly journals Three-dimensional constitutive model for shape memory polymers using multiplicative decomposition of the deformation gradient and shape memory strains

2016 ◽  
Vol 93 ◽  
pp. 43-62 ◽  
Author(s):  
Haedong Park ◽  
Philip Harrison ◽  
Zaoyang Guo ◽  
Myoung-Gue Lee ◽  
Woong-Ryeol Yu
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Deformation Gradient ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Multiplicative Decomposition

scholarly journals Reconfigurable photonic crystals with optical bistability enabled by “cold” programming and thermo-recoverable shape memory polymers

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22461-22467 ◽  
Author(s):  
Wenbin Niu ◽  
Lingcheng Qu ◽  
Rongwen Lyv ◽  
Shufen Zhang
Keyword(s):  
Photonic Crystals ◽  
Shape Memory ◽  
Capillary Pressure ◽  
Optical Bistability ◽  
Shape Memory Polymers

A type of reconfigurable photonic crystals with optically bistable states enabled by capillary pressure-induced programming and heat-caused recoverable shape memory polymers was reported.

Three-Dimensional Numerical Simulation of Thermomechanical Constitutive Model for Shape Memory Polymers With Application to Morphing Wing Skin

2013 ◽  
Author(s):  
Olaniyi A. Balogun ◽  
Changki Mo ◽  
A. K. Mazher ◽  
John C. Brigham
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Constitutive Model ◽  
Shape Memory ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Thermomechanical Behavior ◽  
One Dimensional ◽  
Simulation Results ◽  
Wing Skin

This paper presents three-dimensional numerical simulation of thermomechanical constitutive model for shape memory polymers. Shape memory polymers (SMPs) are a class of smart materials with high potential for application to automotive, aerostructures, and medical devices, which can benefit from its intrinsic shape changing properties. In particular, looking at its application to aerospace substructure such as morphing wings, thermomechanical behavior of the SMPs needs to be well established and predicted. In order to predict the thermomechanical behavior of SMPs structures, a one-dimensional rheological thermomechanical constitutive model was adopted and a numerical simulation of this model was developed using a commercial finite element analysis package ABAQUS. The particular one-dimensional model was selected due to its potential to represent the key material behaviors of SMP with a relatively low number of required material constants, which is practical for engineering industrial applications. The model was expanded to a three-dimensional isotropic model and then incorporated into the finite element method by means of an ABAQUS user-defined subroutine (UMAT). The methods of three-dimensional expansion and numerical implementation are presented in this work. A time evolution of the analysis was conducted by making use of the backward difference method, which was applied to all quantities within the model including the material properties. A comparison of the numerical simulation results was carried out with the available experimental data. Numerical simulation results clearly exhibit the thermomechanical properties of the material, which include shape fixity, shape recovery, and recovery stress. Finally, a preliminary set of predictions for an unmanned aerial vehicle (UAV) morphing wing skin are also presented.

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