3D printing of shape memory polymer for functional part fabrication

Published on Jun 1, 2016in The International Journal of Advanced Manufacturing Technology3.226
· DOI :10.1007/S00170-015-7843-2
Yang Yang14
Estimated H-index: 14
 (HKU: University of Hong Kong), Yonghua Chen25
Estimated H-index: 25
 (HKU: University of Hong Kong)+ 1 AuthorsYingtian Li11
Estimated H-index: 11
 (HKU: University of Hong Kong)
Sources
Abstract
This article presents a novel method of shape memory polymer (SMP) processing for additive manufacturing, in particular, fused-deposition modeling (FDM). Critical extrusion process parameters have been experimented to determine an appropriate set of parameter values so that good-quality SMP filament could be made for FDM. In the FDM process, effects of different printing parameters such as extruder temperature and scanning speed on object printing quality are also studied. In all the process studies, we aim to achieve good-quality parts by evaluating part density, tensile strength, dimensional accuracy, and surface roughness. Based on these studies, sample SMP models have been successfully built. Due to the thermal sensitive nature of the printed SMP parts, they can potentially be used as fasteners in active assembly/disassembly, smart actuators, deployable structures for aero-space applications, etc.
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References39
Newest
Mar 1, 2016·The International Journal of Advanced Manufacturing Technology3.23
#1Harry Bikas (University of Patras)H-Index: 8
#2Panagiotis Stavropoulos (University of Patras)H-Index: 22
Last. George Chryssolouris (University of Patras)H-Index: 68
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Additive manufacturing is a technology rapidly expanding on a number of industrial sectors. It provides design freedom and environmental/ecological advantages. It transforms essentially design files to fully functional products. However, it is still hampered by low productivity, poor quality and uncertainty of final part mechanical properties. The root cause of undesired effects lies in the control aspects of the process. Optimization is difficult due to limited modelling approaches. Physical ph...
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Mar 1, 2015·Journal of Electronic Materials1.94
#1Seyeon Hwang (UTEP: University of Texas at El Paso)H-Index: 4
#2Edgar I. Reyes (UTEP: University of Texas at El Paso)H-Index: 1
Last. Namsoo Kim (UTEP: University of Texas at El Paso)H-Index: 22
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New metal/polymer composite filaments for fused deposition modeling (FDM) processes were developed in order to observe the thermo-mechanical properties of the new filaments. The acrylonitrile butadiene styrene (ABS) thermoplastic was mixed with copper and iron particles. The percent loading of the metal powder was varied to confirm the effects of metal particles on the thermo-mechanical properties of the filament, such as tensile strength and thermal conductivity. The printing parameters such as...
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Nov 5, 2014·Polymer4.43
#1Steven Shaffer (UTD: University of Texas at Dallas)H-Index: 1
#2Kejia Yang (UTD: University of Texas at Dallas)H-Index: 6
Last. Walter VoitH-Index: 28
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The mechanical properties of materials printed using fused filament fabrication (FFF) 3D printers typically rely only on adhesion among melt processed thermoplastic polymer strands. This dramatically limits the utility of FFF systems today for a host of manufacturing and consumer products and severely limits the toughness in 3D printed shape memory polymers. To improve the interlayer adhesion in 3D printed parts, we introduce crosslinks among the polymer chains by exposing 3D printed copolymer b...
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Oct 16, 2014·Smart Materials and Structures3.58
#1Kazuto Takashima (Kyushu Institute of Technology)H-Index: 13
#2Kazuhiro Sugitani (Kyushu Institute of Technology)H-Index: 1
Last. Toshiharu MukaiH-Index: 24
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Shape-memory polymer (SMP) can be deformed by applying a small load above its glass transition temperature (Tg). Shape-memory polymer maintains its shape after it has cooled below Tg and returns to a predefined shape when subsequently heated above Tg. The reversible change in the elastic modulus between the glassy and rubbery states of an SMP can be on the order of several hundred times. Based on the change in stiffness of the SMP in relation to the change in temperature, the present study attem...
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#1R MelnikovaH-Index: 1
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3D printing is a form of additive manufacturing, i.e. creating objects by sequential layering, for pre-production or production. After creating a 3D model with a CAD program, a printable file is used to create a layer design which is printed afterwards. While often more expensive than traditional techniques like injection moulding, 3D printing can significantly enhance production times of small parts produced in small numbers, additionally allowing for large flexibility and the possibility to cr...
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Mar 4, 2014·The International Journal of Advanced Manufacturing Technology3.23
#1David Espalin (UTEP: University of Texas at El Paso)H-Index: 24
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While NASA explores the power of 3D printing in the development of the next generation space exploration vehicle, a CubeSat Trailblazer was launched in November 2013 that integrated 3D-printed structures with embedded electronics. Space provides a harsh environment necessary to demonstrate the durability of 3D-printed devices with radiation, extreme thermal cycling, and low pressure—all assaulting the structure at the atomic to macroscales. Consequently, devices that are operational in orbit can...
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Feb 28, 2014·Smart Materials and Structures3.58
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Planar auxetic structures have the potential to impact on a wide range of applications from deployable and morphing structures to space-filling composite and medical treatments. The ability to fabricate auxetics from smart materials greatly enhances this facility by building in controllable actuation and deployment. A smart auxetic device can be compressed and fixed into a storage state. When deployment is required the device can be appropriately stimulated and the stored elastic energy is relea...
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Jan 9, 2014·Smart Materials and Structures3.58
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As a new class of smart materials, shape memory polymers and their composites (SMPs and SMPCs) can respond to specific external stimulus and remember the original shape. There are many types of stimulus methods to actuate the deformation of SMPs and SMPCs, of which the thermal- and electro-responsive components and structures are common. In this review, the general mechanism of SMPs and SMPCs are first introduced, the stimulus methods are then discussed to demonstrate the shape recovery effect, ...
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Aug 29, 2013·Smart Materials and Structures3.58
#1Minoru Taya (UW: University of Washington)H-Index: 61
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The design of a reversible bending actuator based on a SMA/SMP composite is presented. The SMA/SMP composite is made of SMA NiTi wires with a bent ‘U’-shape in the austenite phase embedded in an epoxy SMP matrix which has a memorized flat shape. The bending motion is caused by heating the composite above TAf to activate the NiTi recovery. Upon cooling, the softening from the austenite to R-phase transformation results in a relaxation of the composite towards its original flat shape. In the three...
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Abstract A novel operating method for shape memory polymer (SMP) actuators has been developed and characterized. Since the shape memory effect works in one way, an external force to deform SMP has been used in conventional SMP actuators. Our actuators use only the shape memory effect to reproduce a specific behavior. Our operating method is as follows. Two kinds of SMPs with different glass transition temperatures (Tg1 and Tg2 (Tg1
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Abstract null null The influences of loading conditions on the shape memory effect (SME) of thermo-induced shape memory polyurethane (TSMPU) are investigated by series of thermo-mechanical deformation experiments. The variables related to mechanical responses and the strain contours are extracted to analyze the SME. It is shown that the recovery ratio gradually decreases and the residual strain gradually accumulates with the increase of number of cycles. Then, the internal stress is obtained fro...
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The worldwide demand for additive manufacturing (AM) is increasing due to its ability to produce more challenging customized objects based on the process parameters for engineering applications. The processing of conventional materials by AM processes is a critically demanded research stream, which has generated a path-breaking scenario in the rapid manufacturing and upcycling of plastics. The exponential growth of AM in the worldwide polymer market is expected to exceed 20 billion US dollars by...
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Filaments loaded with griseofulvin (GF), a model poorly water-soluble drug, were prepared and used for 3D printing via fused deposition modeling (FDM). GF was selected due to its high melting temperature, enabling lower temperature hot-melt extrusion (HME) keeping GF largely crystalline in the filaments, which could help mitigate the disadvantages of high HME processing temperatures such as filament quality, important for printability and the adverse effects of GF recrystallization on tablet pro...
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Actuators with variable stiffness have vast potential in the field of compliant robotics. Morphological shape changes in the actuators are possible, while they retain their structural strength. They can shift between a rigid load-carrying state and a soft flexible state in a short transition period. This work presents a hydraulically actuated soft actuator fabricated by a fully 3D printing of shape memory polymer (SMP). The actuator shows a stiffness of 519 mN/mm at 20 ∘C and 45 mN/mm at 50 ∘C a...
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A good understanding of the heat transfer in fused filament fabrication is crucial for an accurate stress prediction and subsequently for repetitive, high-quality printing. This work focuses on two challenges that have been presented when it comes to the accuracy and efficiency in simulating the heat transfer in the fused filament fabrication process. With the prospect of choosing correct thermal boundary conditions expressing the natural convection between printed material and its environment, ...
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