Elastic Memory Composite Material: An Enabling Technology for Future Furlable Space Structures

Campbell, Douglas; Lake, Mark S.; Scherbarth, Mark; Afb, Kirtland; Nelson, Emmett; Six, Randal W.

doi:10.2514/6.2005-2362

Cited by 48 publications

(34 citation statements)

References 4 publications

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“…Here by "quasi-static", we mean that the beam deflection is temperature dependent. SMP materials have found many engineering applications, such as heat-shrinkable tubes for electronics or films for packaging 4 , self-deployable sun sails in spacecraft 5 , intelligent medical devices 6 , implants for minimally invasive surgery 7 , and various others 8 . The utility of SMP's in these applications is due to the capability of shape changing to change from an "initial state" to a "final state" after a stimulus is applied.…”

Section: Introductionmentioning

confidence: 99%

A Quasi-Static Nonlinear Model of Shape Memory Polymer Composite Beams for Space Applications

Bergman

Yang

Fang³

2014

Spacecraft Structures Conference

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Shape Memory Polymer Composites (SMPC) structures, due to their ability to be packed into compact volumes and then later on transformed back to their original shapes, are an ideal solution for deployment problems of large light-weight space structures. Although much research on constitutive laws and qualitative analysis of mechanics of SMPC structures has been carried out, little has been reported in the literate about the development of dynamic equations for SMPC structures. This paper documents a macroscopic model for shape fixation and shape recovery processes of an SMPC cantilever beam, with special attention given to quasi-static states describing the shape fixation process. In the development, a nonlinear geometric model is combined with a temperature-dependent constitutive law. Based on this beam model, numerical results are obtained through use of finite difference approximation and Newton's method in iterative solution. Additionally, the dynamic equations of the SMPC cantilever beam are devised.

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Section: Introductionmentioning

confidence: 99%

A Quasi-Static Nonlinear Model of Shape Memory Polymer Composite Beams for Space Applications

Bergman

Yang

Fang³

2014

Spacecraft Structures Conference

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“…SMP-resin-based composites reinforced by continuous fibers are regarded as the most promising materials for deployable structures in future space applications [33][34][35][36]. The fabrication of high-performance SMP epoxy systems is thus essential.…”

Section: Introductionmentioning

confidence: 99%

A molecular dynamics investigation of the deformation mechanism and shape memory effect of epoxy shape memory polymers

Yang

Wang

Guo

et al. 2016

Sci. China Phys. Mech. Astron.

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Following deformation, thermally induced shape memory polymers (SMPs) have the ability to recover their original shape with a change in temperature. In this work, the thermomechanical properties and shape memory behaviors of three types of epoxy SMPs with varying curing agent contents were investigated using a molecular dynamics (MD) method. The mechanical properties under uniaxial tension at different temperatures were obtained, and the simulation results compared reasonably with experimental data. In addition, in a thermomechanical cycle, ideal shape memory effects for the three types of SMPs were revealed through the shape frozen and shape recovery responses at low and high temperatures, respectively, indicating that the recovery time is strongly influenced by the ratio of E-51 to 4,4'-Methylenedianiline. H. Yang, Z. D. Wang, Y. F. Guo, and X. H. Shi, A molecular dynamics investigation of the deformation mechanism and shape memory effect of epoxy shape memory polymers, Sci.

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“…Such rudimentary early applications did not necessitate a detailed understanding or modeling of the thermomechanical behavior of these materials. However, in recent years shape-memory polymers are beginning to be used for critical biomedical applications (e.g., Lendlein and Langer, 2002;Metcalfe et al, 2003;Baer et al, 2007b), microsystems (e.g., Maitland et al, 2002;Metzger et al, 2002;Gall et al, 2004), re-writable media for data storage (e.g., Vettiger et al, 2002;Wornyo et al, 2007), and self-deployable space structures (Campbell et al, 2005). In order to develop a robust simulationbased capability for the design of devices for such critical applications, one requires an underlying accurate thermo-mechanically-coupled constitutive theory and an attendant validated numerical implementation of the theory.…”

Section: Introductionmentioning

confidence: 99%

Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations

Srivastava

Chester

Anand

2010

Journal of the Mechanics and Physics of Solids

160

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With the aim of developing a thermo-mechanically-coupled large-deformation constitutive theory and a numerical-simulation capability for modeling the response of thermally-actuated shape-memory polymers, we have (i) conducted large strain compression experiments on a representative shape-memory polymer to strains of approximately unity at strain rates of 10 −3 s −1 and 10 −1 s −1 , and at temperatures ranging from room temperature to approximately 30 C above the glass transition temperature of the polymer; (ii) formulated a thermo-mechanically-coupled large-deformation constitutive theory; (iii) calibrated the material parameters appearing in the theory using the stress-strain data from the compression experiments; (iv) numerically implemented the theory by writing a user-material subroutine for a widely-used finite element program; and (v) conducted representative experiments to validate the predictive capability of our theory and its numerical implementation in complex three-dimensional geometries. By comparing the numericallypredicted response in these validation simulations against measurements from corresponding experiments, we show that our theory is capable of reasonably accurately reproducing the experimental results. As a demonstration of the robustness of the three-dimensional numerical capability, we also show results from a simulation of the shape-recovery response of a stent made from the polymer when it is inserted in an artery modeled as a compliant elastomeric tube.

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Elastic Memory Composite Material: An Enabling Technology for Future Furlable Space Structures

Cited by 48 publications

References 4 publications

A Quasi-Static Nonlinear Model of Shape Memory Polymer Composite Beams for Space Applications

A Quasi-Static Nonlinear Model of Shape Memory Polymer Composite Beams for Space Applications

A molecular dynamics investigation of the deformation mechanism and shape memory effect of epoxy shape memory polymers

Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations

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