Reinforcing silicone with hemp fiber for additive manufacturing

Koushki, Pantea; Kwok, Tsz-Ho; Hof, Lucas A.; Wüthrich, Rolf

doi:10.1016/j.compscitech.2020.108139

Cited by 36 publications

(18 citation statements)

References 27 publications

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“…The higher the BF content is, the greater the restriction on molecular motion and thus the lower the ductility. Similar behavior was found with the incorporation of more than 15% hemp fibers in a silicone matrix 22 and natural fiber polypropylene and HDPE BM. 18,23 Increases in the proportion of PLA also reduced ductility.…”

Section: Mechanical Performance Resultssupporting

confidence: 75%

Optimization of processing conditions and mechanical properties of banana fiber‐reinforced polylactic acid/high‐density polyethylene biocomposites

Rodríguez

Álvarez-Láinez

Orrego

2021

J of Applied Polymer Sci

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Section: Mechanical Performance Resultssupporting

confidence: 75%

Optimization of processing conditions and mechanical properties of banana fiber‐reinforced polylactic acid/high‐density polyethylene biocomposites

Rodríguez

Álvarez-Láinez

Orrego

2021

J of Applied Polymer Sci

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“…A hot oven was used to heat the fibers and dehydrate them at 80°C for 3 hours. e interface strength and mechanical properties of NFGC were improved by treating the fiber using alkaline treatment [12,13]. Further, these materials were powdered in the ball mill with its size ranging from 70 to 100 μm.…”

Section: Methodsmentioning

confidence: 99%

“…% [12]. e alkali treatment of natural fiber that provided roughness removed a certain amount of lignin and enhanced natural fiber adhesiveness [13,14]. Even though enormous works are carried out in this field, the NFRCs have lower mechanical and functional performance due to porosity formulation caused by poor interaction or bonding between fiber and matrix.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on the Mechanical Properties of Natural Fiber Granulated Composite Using Hybrid Additive Manufacturing: A Novel Approach

Anandkumar

Babu

Sathyamurthy

2021

Advances in Materials Science and Engineering

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In this work, experiments on mechanical properties such as tensile, flexural, effects, and stiffness testing are performed on natural fiber granulated composites (NFGC) manufactured using a hybrid additive manufacturing technique. The natural fiber granulated composites are prepared using the powdered form of sugarcane, jute, ramie, banana, pineapple fiber, and seashell powder with a volume fraction of 0.8. In the hybrid additive manufacturing technique, the fused deposited modeling (FDM) machine is modified by combining with the shape deposition modeling (SDM) to print the specimens layer by layer, and the influence of the number of layers on the mechanical properties is analyzed. The results concluded that increasing the number of layers from 6 to 12 improved the mechanical properties such as tensile strength, flexural strength, impact strength, and hardness values by 40.84, 50.04, 21.55, and 20.55%, respectively. Further, a novel technique can be utilized for developing the composites in replacement with conventional methods.

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“…[6] With regard to additive manufacturing, syringe pumps are frequently used for extrusion of low viscosity fluids as well as medium viscosity pastes. A benefit of such syringe pump extruders is the ability to process a wide range of materials including magnetic, [7] ceramic, [8] and other composite materials [9,10] at a wide variety of temperatures and pressures. The use of ram extruders with higher pressures in additive manufacturing is less common.…”

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confidence: 99%

Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber

et al. 2021

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A ram extruder is described for high-pressure extrusion of fully compounded thermoset rubber to achieve additive manufacturing. The extruder uses a piston driven by a geared stepper motor to provide volumetric displacement of the rubber charge residing in a temperature-controlled barrel. Along with activators, accelerators, and a vulcanizing agent, the rubber compound is a formulation of 30 parts carbon black per hundred parts nitrile rubber. Sets of serpentine patterns are printed in parallel and transverse orientations relative to the load direction. From printing to post-cure, the printed specimens exhibited linear shrinkage of 65% in the print direction. Although printed samples had relatively low void content compared with typical additively manufactured parts by material extrusion, significant decreases in the tensile properties were observed relative to compression-molded specimens of the same rubber compound. The mean strain to failure was observed as 462% for compression-molded samples, compared with 347% and 183% for printed specimens with parallel and transverse orientations. To reduce the shrinkage and increase the interfacial area between extruded roads, backstitch and sinewave diddling patterns were implemented to superimpose oscillatory motions along the print path with a periodicity of 1 mm. The specimens printed with the diddling patterns were observed to provide less shrinkage and improved properties compared to the regular serpentine patterns. The mean strain to failure in the transverse orientation, respectively, increased to 218% and 265% for the backstitch and sinewave patterns. Suggested future research is discussed, and the diddling program is provided in the appendix. K E Y W O R D S material extrusion, nitrile rubber, diddling patterns, 3D printing, thermoset rubber 1 | INTRODUCTION Additive manufacturing provides a means by which complex products may be made without tooling. ASTM F2792: Standard Terminology for Additive Manufacturing Technologies defines seven families of additive manufacturing. Of

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Reinforcing silicone with hemp fiber for additive manufacturing

Cited by 36 publications

References 27 publications

Optimization of processing conditions and mechanical properties of banana fiber‐reinforced polylactic acid/high‐density polyethylene biocomposites

Optimization of processing conditions and mechanical properties of banana fiber‐reinforced polylactic acid/high‐density polyethylene biocomposites

Investigations on the Mechanical Properties of Natural Fiber Granulated Composite Using Hybrid Additive Manufacturing: A Novel Approach

Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber

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