Abstract Four-dimensional (4D) printing technology of continuous carbon fiber reinforced shape memory polymer composites is a potential manufacturing process for lightweight and high-strength intelligent composite structures. In this study, a 3D printer with dual feed channels based on the fused deposition modeling (FDM) was designed to fabricate continuous carbon fiber reinforced shape memory poly(lactic acid)-based composites (CFRSMPC). The impact of various printing parameters on the bending strength and flexural modulus of 4D printed CFRSMPC was evaluated by the three-point bending test. Meanwhile, mathematical prediction models of bending strength and modulus based on the existing experimental data were established. The electro-induced shape memory effect of 4D printed CFRSMPC was investigated by the electric heating shape recovery test. The shape recovery rate of the specimens was more than 95%, indicating that the resistance heating method is stable and feasible. The quantitative effect of bending angle and temperature on the resistance of CFRSMPC during the programming and recovery process was further investigated. The results demonstrated that the real-time deformation of the CFRSMPC could be monitored by the resistance measurement method. It can be concluded that the CFRSMPC fabricated using the 4D printing method can serve as potential building blocks for electrically activated and deployable structures.
#1Tianzhen Liu(HIT: Harbin Institute of Technology)H-Index: 4
#2Liwu Liu(HIT: Harbin Institute of Technology)H-Index: 34
Last. Jinsong Leng(HIT: Harbin Institute of Technology)H-Index: 64
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Abstract Four-dimensional (4D) printing as a new generation additive manufacturing of smart materials has shown great potential for the intelligent development of multi-functional and customized structures. The microarchitecture design of printing infill patterns could bring flexible and diversified structural performances by combining the geometry design, thus opening up more possibilities for practical application. This work investigates the anisotropic characteristics of mechanical and shape ...
This paper aims to investigate how the user-controlled parameters of the fused filament fabrication three-dimensional printing process define temperature conditions on the boundary between layers of the part being fabricated and how these conditions influence the structure and strength of the polylactic acid part.,Fracture load in a three-point bending test and calculated related stress were used as a measure. The samples were printed with the long side along the z-axis, thus, in the bend tests,...
#2Xiao Kuang(Georgia Institute of Technology)H-Index: 26
Last. Ruike Zhao(OSU: Ohio State University)H-Index: 13
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Shape-programmable soft materials that exhibit integrated multifunctional shape manipulations, including reprogrammable, untethered, fast, and reversible shape transformation and locking, are highly desirable for a plethora of applications, including soft robotics, morphing structures, and biomedical devices. Despite recent progress, it remains challenging to achieve multiple shape manipulations in one material system. Here, a novel magnetic shape memory polymer composite is reported to achieve ...
#2Fenghua Zhang(HIT: Harbin Institute of Technology)H-Index: 23
Last. Tsu-Wei Chou(UD: University of Delaware)H-Index: 86
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Abstract The four-dimensional (4D) printing technology enables the convergence of three-dimensional (3D) printing and shape memory polymer (SMP). The aim of this research is to demonstrate the synergistic effect between a spring steel strip (SSS) and a 4D printed thermoplastic SMP on enhancing the shape recovery properties. The recovery time of the SMP/SSS hybrid composite was shortened by 39% as compared to that of the SMP specimen. The corresponding recovery force of the SMP/SSS hybrid specime...
#1Wei Zhao(HIT: Harbin Institute of Technology)H-Index: 6
#2Fenghua Zhang(HIT: Harbin Institute of Technology)H-Index: 23
Last. Yanju Liu(HIT: Harbin Institute of Technology)H-Index: 62
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Abstract Shape memory polymers (SMPs) can be triggered by an external stimulus to realize the shape changing from temporary shape to its original shape. Due to its biodegradability, easy forming properties and shape memory effect, SMPs have been widely considered in bio-medical applications. This paper details an application of SMP in personalized 4D printing of a bio-designed tracheal scaffold. Compared with the traditional tracheal scaffolds, the SMP tracheal scaffolds can conform to the issue...
Abstract A clear understanding of carbon fiber (CF) microstructure is necessary for the development of high strength CFs. Here, we present an atomistic approach for generating and characterizing realistic microstructures of CFs. Large-scale reactive molecular dynamics simulations are used to generate a set of distinct CF microstructures. Comprehensive characterization of the simulated microstructures is enabled by the development of a suite of computational structural analysis tools capable of e...
Last. A.M. Zahedi(UI: University of Isfahan)H-Index: 1
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Abstract Additive manufacturing of fiber reinforced composites is of great interest in various industrial applications. In this study, an innovative extruder is designed and manufactured for fused deposition modeling (FDM) 3D printers in order to produce continuous fiber reinforced thermoplastic (CFRT) composites. There are some challenges along this way such as making tension in fiber, fiber surface preparation, printing temperature and feed rate to produce a composite part with good quality. T...
#1J.M. Chacón(UCLM: University of Castilla–La Mancha)H-Index: 10
#2M.A. Caminero(UCLM: University of Castilla–La Mancha)H-Index: 16
Last. J.M. Reverte(UCLM: University of Castilla–La Mancha)H-Index: 4
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Abstract Continuous Fibre Reinforced Thermoplastic Composites (CFRTPCs) are becoming alternative materials to replace the conventional thermosetting polymers and metals due to excellent mechanical performance, recycling and potential used in lightweight structures. Fused deposition modelling (FDM) is a promising additive manufacturing technology and an alternative of conventional processes for the fabrication of CFRTPCs due to its ability to build functional parts having complex geometries. The ...
Last. Jian Li(NEFU: Northeast Forestry University)H-Index: 146
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Abstract null null The combination of shape memory polymer composites and 3D printing technology provides novel opportunities for customized manufacturing and intelligentization of products. Here, we developed magneto-responsive shape memory polymer composites with well-balanced strengths and toughness by adding Fe3O4 and cellulose nanofibers (CNFs) to a poly-hydroxybutyrate/poly(e-caprolactone) blend as functional particles and reinforcing component. The influences of Fe3O4 and CNFs on the prop...
Abstract With the structure design and muscle-like actuators, soft robots have been extensively studied for various application potentials in rescue exploration, medical rehabilitation, military reconnaissance etc. It is highly desirable yet challenging to develop fast 3D-assembly, multifunctional and self-healing soft robots to adapt to rapid changing environments. Inspired by multi-bit screwdriver, we address this challenge using a self-healing light-driven shape memory polymer via photo-weldi...
Last. Yubing Dong(ZSTU: Zhejiang Sci-Tech University)H-Index: 16
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Abstract Carbon fiber felt (CFF) has a broad range of applications in electromagnetic interference (EMI) shielding because it is a multi-functional rigid material with a conductive property. In the present work, the flexible and intelligent CFF/poly(ethylene-co-vinyl acetate) (EVA) EMI shielding composites with electrothermal-driven shape memory performance was prepared by hot-pressing method, which provide precise and convenient control-method for driving EMI shielding conversion. As revealed, ...
#1Jing Zhao(UIC: University of Illinois at Chicago)H-Index: 3
#2Muyue Han(UIC: University of Illinois at Chicago)H-Index: 2
Last. Lin Li(UIC: University of Illinois at Chicago)H-Index: 28
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Abstract The integration of shape memory materials into additive manufacturing has added a new dimension of time to conventional 3D printing and enabled innovative product designs with high tailorability and adaptability. To date, most studies on shape memory effects mainly adopt experimental approaches to characterize the material responsiveness to various stimulation conditions considering a single thermomechanical loading cycle. The information regarding the cyclic shape memory behaviors as w...
Last. Stephan Rudykh(UW: University of Wisconsin-Madison)H-Index: 22
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Abstract This paper reports the failure and recovery mechanisms of 3D-printed lightweight honeycomb composites. Through this experimental study, we demonstrate the enhanced mechanical performance of 3D-printed composite structures and their ability for shape recovery under heat excitation. The remarkable mechanical performance of the reinforced honeycombs draws from the combination of the structural geometry and the tailored material composition. The results show that the addition of continuous ...
Last. Yanju Liu(HIT: Harbin Institute of Technology)H-Index: 62
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Abstract Chiral-lattice metamaterials with unique mechanical, optical, electrical and magnetic properties have been widely used in many engineering applications, such as chiral recognition and separation, stealth materials and devices, as well as biological sensors. Various design strategies have been developed to obtain chiral-lattice metamaterials with different mechanical properties. The fast grown design strategies that can provide a variety of Poisson’s ratios and elastic moduli have brough...
#1Chengjun Zeng(HIT: Harbin Institute of Technology)H-Index: 3
#2Liwu Liu(HIT: Harbin Institute of Technology)H-Index: 34
Last. Yanju Liu(HIT: Harbin Institute of Technology)H-Index: 62
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Abstract Here, a co-extrusion-based 3D printing technology was applied to integrally manufacture continuous fiber reinforced composite trapezoidal corrugated sandwich structures (CFRCTCSs) with shape memory capability. The theoretical models were developed to analyze the bending performance and failure behavior of the 3D printed CFRCTCSs with various geometric configurations and verified by three-point bending tests. Good agreement between the predictions and the experimental measurements was ac...
Last. Ludwig Cardon(UGent: Ghent University)H-Index: 12
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Abstract The development of well-designed polylactic acid (PLA) based composite filaments through fused filament fabrication (FFF) is crucial, as PLA printed parts are characterized by a high brittleness. Here we focus on FFF composite formation using ductile poly (butylene adipate-co-terephthalate) (PBAT), the nanoclay cloisite and the chain extender Joncryl. A high modulus, flexibility, toughness and notched impact strength result upon combining PLA/PBAT (80:20; mass basis) with a sufficiently...