Analysis and design of smart mandrels using shape memory polymers

Shape memory polymers (SMPs), as a class of programmable stimuliresponsive shape changing polymers, are attracting increasing attention from the standpoint of both fundamental research and technological innovations. Following a brief introduction of the conventional shape memory effect (SME), progress in new shape memory enabling mechanisms and triggering methods, variations of in shape memory forms (shape memory surfaces, hydrogels, and microparticles), new shape memory behavior (multi-SME and two-way-SME), and novel fabrication methods are reviewed. Progress in thermomechanical modeling of SMPs is also presented. Abbreviations:SCPs shape changing polymers; LCEs liquid crystalline elastomers; SMP shape memory polymer; SME shape memory effect; 2W two-way; 1W oneway; T trans transition temperature; T g glass transition temperature; T m melting temperature; T cl liquid crystal cleaning temperature; T d deformation temperature; T f shape fixing temperature; T c crystallization temperature; R f shape stability ratio; R r shape recovery ratio; T sw switching temperature; ε max maximum recoverable strain; σ max maximum recovery stress; SMC shape memory cycle; ε load strain under load; ε fixed strain; T r recovery Page 2 of 106 A c c e p t e d M a n u s c r i p t 2 temperature; ε rec recovered strain; V r strain recovery rate; T σmax temperature corresponding to σ max ; T sw,app apparent switching temperature; PCL poly(ε-caprolactone); SMPU shape memory polyurethane; EMU elemental memory unit; TME temperature memory effect; PU polyurethane; T i liquid-crystal isotropic transition temperature; T v vitrification temperature; CIE crystallization induced elongation; MIC melting induced contraction

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“…A c c e p t e d M a n u s c r i p t 18 of rewritable data storage. The surface SME is not just limited to the conventional dual-SMPs.…”

Section: Phase Versus Molecular Switches and Thermal Versus Non-thermmentioning

confidence: 99%

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Zhao

Xie

2015

Progress in Polymer Science

1,189

749

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“…However, the low mechanical properties (stiffness and strength) are in general not sufficient for structural applications, and therefore several types of reinforcements are added into the SMP matrix to produce composites with improved mechanical properties [8][9][10], Nowadays, SMPs and especially shape memory polymer composites (SMPCs) have been widely used in several engineering applications ranging from deployable space structures [11][12][13], morphing airframes [11,14] and adaptive optical [15,16], and biomedical devices [11,17]. Other applications in which SMPCs have been used include smart textiles and fabrics [11,18], smart dry adhesives [19], self-healing systems [11,20] and mandrel fabrication technologies involving recycling [21,22].…”

Section: Introductionmentioning

confidence: 99%

Shape memory polymer S-shaped mandrel for composite air duct manufacturing

Liu

Leng

et al. 2015

Composite Structures

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“…SMPs have several advantages, including good recoverability, low density, easy processing, adjustable shape transition temperature, biodegradability, and biocompatibility . As a result, they are widely used in smart medical facilities, aerospace deployment devices, flexible electronic devices, 3D and 4D printing, and several many other fields . Conventional space deployment structures could complete structural changes by means of mechanical hinges, energy storage, or motor drive tools .…”

Section: Introductionmentioning

confidence: 99%

“…Compared to conventional diaphragms, smart reversible diaphragms with shape memory function are better alternatives. Due to the ability of SMPs to undergo large deformation and shape recovery, the SMP shell structure has been widely used in the aerospace field, such as deployable hinge, foldable wing and smart mandrels . Inspired by these intelligent structures, a built‐in diaphragm of space diaphragm tank is prepared based on SMP materials in this work.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of smart diaphragm based on shape memory polymer

Tao

Liu

Yang

et al. 2018

J of Applied Polymer Sci

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Currently, tank diaphragms are mostly applied in the field of aerospace but one of their limitations have to do with their inability to recycle. In the article, we discussed the modeling of a new kind of reversible diaphragm, so‐called shape memory polymer (SMP) diaphragm. A thermo‐mechanical modeling of SMP is implemented by the finite element method using a constitutive model. A single variable in this model is defined and used to simplify the model compared to other existing models. Evolution of the analysis is conducted by making use of the intermediate difference forms and Jacobian matrix, which is applied to all quantities within the model. The overturning and recovery behaviors of the SMP diaphragm are examined. And, the effect of several parameters, including thickness, height and radius of the diaphragm, as well as temperature on the overturning performance are investigated. This study led to the establishment of an optimized model with the objective function requiring minimum overturning pressure for completing deformation and design variables associated with thickness, height, radius, and temperature. An optimized SMP diaphragm is obtained under the critical pressure constraints. The results contribute to the design and application of novel SMP diaphragms. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46557.

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Analysis and design of smart mandrels using shape memory polymers

Cited by 60 publications

References 29 publications

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Shape memory polymer S-shaped mandrel for composite air duct manufacturing

Design and analysis of smart diaphragm based on shape memory polymer

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