scholarly journals Modeling and Simulation of Compression Molding Process for Sheet Molding Compound (SMC) of Chopped Carbon Fiber Composites

2017 ◽  
Vol 10 (2) ◽  
pp. 130-137 ◽  
Author(s):  
Yang Li ◽  
Zhangxing Chen ◽  
Hongyi Xu ◽  
Jeffrey Dahl ◽  
Danielle Zeng ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Modeling And Simulation ◽  
Compression Molding ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Molding Process ◽  
Molding Compound ◽  
Sheet Molding Compound

Comparison and characterization of discontinuous carbon fiber liquid-molded nylon to hydroentanglement/compression-molded composites

2019 ◽  
Vol 33 (8) ◽  
pp. 1078-1093 ◽  
Author(s):  
Siddhartha Brahma ◽  
Selvum Pillay ◽  
Haibin Ning
Keyword(s):  
Carbon Fiber ◽  
Mechanical Performance ◽  
Weight Fraction ◽  
Polyamide 6 ◽  
Compression Molding ◽  
Fiber Composites ◽  
Strength Properties ◽  
Processing Temperature ◽  
Carbon Fiber Composites ◽  
Scanning Calorimetry

This article looks at liquid molding of polyamide 6 (PA6) via vacuum assisted resin transfer molding (VARTM) of discontinuous recycled carbon fiber composites. Its mechanical, thermal, and optical characterization is compared to hydroentanglement/compression molding. Liquid-molded composites show consistent improvement in their tensile and impact properties at three different weight fractions in comparison to hydroentanglement/compression molding. There was roughly a 10 and 13% increase in its tensile strength, modulus, and impact strength properties at 30 and 40% weight fractions and almost a 120% increase at 50% weight fraction. Fourier-transform infrared spectroscopy and differential scanning calorimetry data show that the caprolactam was synthesized to PA6 and was comparable to commercial grade PA6 used in this research. Scanning electron microscopy studies show poor wet out in the case of hydroentanglement/compression molding as compared to VARTM. The combination of better mechanical performance and lower processing temperature (165°C) shows promise in being a viable method to process PA6-based recycled fiber composites.

scholarly journals CHARACTERIZATION OF THE FRACTURE MECHANICAL BEHAVIOR OF C-SMC MATERIALS

2018 ◽  
Vol 18 ◽  
pp. 1 ◽  
Author(s):  
Martin Tiefenthaler ◽  
Philipp S. Stelzer ◽  
Chi N. Chung ◽  
Volker Reisecker ◽  
Zoltan Major
Keyword(s):  
Carbon Fiber ◽  
Tensile Tests ◽  
Representative Specimen ◽  
Carbon Fiber Composites ◽  
Molding Compound ◽  
Sheet Molding Compound ◽  
Compound C ◽  
Specimen Width ◽  
Fiber Sheet ◽  
Point Bend

The fracture mechanics of random discontinuous Carbon Fiber Sheet Molding Compound (C-SMC) materials compared to traditional carbon fiber composites are not well understood. An experimental study was carried out to characterize the fracture behavior of such C-SMC materials. Mode I tests, using double cantilever beam specimens, and mode II tests, adopting the four-point bend, end-notched flexure configuration, were performed. Results show high variations in the forcedeflection responses and scatter in the fracture toughness properties GIc and GIIc, due to the complex mesostructure defined by random oriented carbon fiber chips. To investigate the influence of the mesostructure, tensile tests with varying specimen width and thickness were assessed by stochastic measures to find the representative specimen size.

scholarly journals Molding process and properties of continuous carbon fiber three-dimensional printing

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983569 ◽  
Author(s):  
Jun Zhang ◽  
Zude Zhou ◽  
Fan Zhang ◽  
Yuegang Tan ◽  
Renhui Yi
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Three Dimensional ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Molding Process ◽  
Three Dimensional Printing ◽  
Continuous Carbon Fiber ◽  
Dimensional Printing

Currently, carbon fiber composite has been applied in the field of three-dimensional printing to produce the high-performance parts with complex geometric features. This technique comprise both the advantages of three-dimensional printing and the material, which are light weight, high strength, integrated molding, and without mold, and the limitation of model complexity. In order to improve the performance of three-dimensional printing process using carbon fiber composite, in this article, a novel molding process of three-dimensional printing for continuous carbon fiber composites is developed, including the construction of printing material, the design of printer nozzle, and the modification of printing process. A suitable structure of nozzle on the printer is adjusted for the continuous carbon fiber composites. For the sake of ensuring the continuity of composited material during the processing, a cutting algorithm for jumping point is proposed to improve the printing path during process. On this basis, the experiment of continuous carbon fiber composite is performed and the mechanical properties of the printed test samples are analyzed. The results show that the tensile strength and bending strength of the sample printed by polylactic acid–continuous carbon fiber composites increased by 204.7% and 116.3%, respectively compared with pure polylactic acid materials, and those of the sample printed by nylon–continuous carbon fiber composites increased by 301.1% and 17.4% compared with pure nylon materials, and those of test sample by nylon–continuous carbon fiber composites under the heated and pressurized treatment increased by 383.6% and 233.2% compared with pure nylon material.

scholarly journals Experimental Characterization of the Interaction Between Carbon Fiber Composite Prepregs During the Preforming Process

2017 ◽  
Author(s):  
Weizhao Zhang ◽  
Zixuan Zhang ◽  
Jie Lu ◽  
Q. Jane Wang ◽  
Xuming Su ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Performance ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Molding Process ◽  
Economic Method ◽  
Interaction Factors

Carbon fiber composites have received growing attention because of their high performance. One economic method to manufacturing the composite parts is the sequence of forming followed by the compression molding process. In this sequence, the preforming procedure forms the prepreg, which is the composite with the uncured resin, to the product geometry while the molding process cures the resin. Slip between different prepreg layers is observed in the preforming step and this paper reports a method to characterize the properties of the interaction between different prepreg layers, which is critical to predictive modeling and design optimization. An experimental setup was established to evaluate the interactions at various industrial production conditions. The experimental results were analyzed for an in-depth understanding about how the temperature, the relative sliding speed, and the fiber orientation affect the tangential interaction between two prepreg layers. The interaction factors measured from these experiments will be implemented in the computational preforming program.

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