scholarly journals A Novel CAE Method for Compression Molding Simulation of Carbon Fiber-Reinforced Thermoplastic Composite Sheet Materials

2018 ◽  
Vol 2 (2) ◽  
pp. 33 ◽  
Author(s):  
Yuyang Song ◽  
Umesh Gandhi ◽  
Takeshi Sekito ◽  
Uday Vaidya ◽  
Jim Hsu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Compression Molding ◽  
Thermoplastic Composite ◽  
Fiber Reinforced ◽  
Composite Sheet ◽  
Sheet Materials ◽  
Carbon Fiber Reinforced

CAE method for compression molding of carbon fiber-reinforced thermoplastic composite using bulk materials

2018 ◽  
Vol 114 ◽  
pp. 388-397 ◽  
Author(s):  
Yuyang Song ◽  
Umesh Gandhi ◽  
Takeshi Sekito ◽  
Uday K. Vaidya ◽  
Srikar Vallury ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Compression Molding ◽  
Thermoplastic Composite ◽  
Fiber Reinforced ◽  
Bulk Materials ◽  
Carbon Fiber Reinforced

scholarly journals Fabrication of Carbon Fiber Reinforced Aromatic Polyamide Composites and Their Thermal Conductivities with a h-BN Filler

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 21
Author(s):  
Min Jun Lee ◽  
Pil Gyu Lee ◽  
Il-Joon Bae ◽  
Jong Sung Won ◽  
Min Hong Jeon ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Hexagonal Boron Nitride ◽  
Aromatic Polyamide ◽  
Crystalline Polymer ◽  
Processing Parameters ◽  
Thermoplastic Composite ◽  
Fiber Reinforced ◽  
Molding Condition ◽  
Carbon Fiber Reinforced

In this study, a carbon fiber-reinforced thermoplastic composite was fabricated using a new aromatic polyamide (APA) as a matrix. Non-isothermal crystallization behaviors in the cooling process of APA resin (a semi-crystalline polymer) and composite were analyzed by using a differential scanning calorimeter (DSC). To determine the optimum molding conditions, processing parameters such as the molding temperature and time were varied during compression molding of the Carbon/APA composite. The tensile and flexural properties and morphologies of the fabricated composites were analyzed. Molding at 270 °C and 50 MPa for 5 min. showed relatively good mechanical properties and morphologies; thus, this condition was selected as the optimal molding condition. In addition, to enhance the thermal conductivity of the Carbon/APA composite, a study was conducted to add hexagonal boron nitride (h-BN) as a filler. The surface of h-BN was oxidized to increase its miscibility in the resin, which resulted in better dispersity in the APA matrix. In conclusion, a Carbon/APA (h-BN) composite manufactured under optimal molding conditions with an APA resin containing surface-treated h-BN showed a thermal conductivity more than twice that of the case without h-BN.

scholarly journals Effect of Press Slide Speed and Stroke on Cup Forming Using a Plain-Woven Carbon Fiber Thermoplastic Composite Sheet

2016 ◽  
Vol 10 (3) ◽  
pp. 381-391 ◽  
Author(s):  
Takeshi Yoneyama ◽  
◽  
Daichi Tatsuno ◽  
Kiichiro Kawamoto ◽  
Masayuki Okamoto ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Internal Structure ◽  
Thermoplastic Composite ◽  
Fiber Reinforced ◽  
Fiber Concentration ◽  
Shape Accuracy ◽  
Load Pressure ◽  
Bottom Dead Center ◽  
The Press ◽  
Carbon Fiber Reinforced

Carbon-fiber-reinforced thermoplastic (CFRTP) is viewed as a prospective material for high-cycle production of CFRP parts. This paper deals with a process whereby a preheated thermoplastic plain-woven carbon fiber fabric sheet is formed into a circular cup by a mechanical servo-press. The effects of press parameters, specifically the bottom dead center and slide speed in the forming of CFRTP cup, on the press load, pressure, internal temperature, shape accuracy, and internal structure have been investigated. A plain-woven carbon-fiber-reinforced PA6 thermoplastic sheet was used. The sheet consisted of four layers of woven 3K carbon and had a thickness of 1 mm. The sheet was heated to 320°C under a halogen heater so that it would be around the recommended temperature for forming 260°C after transfer to the mold. The sheet was pressed into a circular cup shape by a cold mold while the periphery was cramped by a heated holder so as not to cool the sheet before it was pulled into the mold cave. Die clearance was designed considering the thickness increase due to the fiber concentration during the forming. By increasing the slide stroke to the bottom dead center, the applied press load was increased and the internal structure was improved, showing no voids. By increasing the slide speed, the final press load was reduced and shape accuracy was improved through a good pressure distribution on the mold. Measurement of the surface temperature of the sheet during the forming revealed that it remained in the melting region of the resin in the case of fast slide speed, but dropped below the melting temperature in the case of low slide speed. This difference apparently led to spring-in or spring-back after the forming. The experimental results indicate that appropriate balance among press speed, bottom dead center, and sheet temperature is important in the high-cycle forming of CFRTP.

A Review on Acoustic Emission Characterization of Failure Modes of Carbon Fiber Reinforced Composites

2018 ◽  
Vol 1148 ◽  
pp. 43-47 ◽  
Author(s):  
Vemu Vara Prasad ◽  
Javisseti Nageswara Rao
Keyword(s):  
Carbon Fiber ◽  
Failure Modes ◽  
Fiber Composite ◽  
Matrix Material ◽  
Acoustic Emissions ◽  
High Strength ◽  
Fiber Reinforced ◽  
Composite Sheet ◽  
Carbon Fiber Composite ◽  
Carbon Fiber Reinforced

Among various composites available for use, carbon fiber reinforced composite is unique in its Nature. Carbon fiber is an extremely strong thin fiber made by pyrolyzing synthetic fibers, such as rayon, until charred. High Strength Composites are made from this fiber by using appropriate matrix material mostly Epoxy resins are used. High Strength, stiffness, light weight and high thermal conductivity are the main advantages over the other composites. Making products with one single composite sheet is not possible always. Some of the intricate or complex shape making is required for joining of two composite sheet. The composites joining can be done in three ways mainly Adhesive, Riveting and Hybrid. Based on the Review among all these joints adhesive joining gives better economic solution in joining. Experimental results point to significant influence of fibre on mechanical properties of sample. The tensile test of the acoustic signal emission (AE) to identify the current state of material integrity in real time. Acoustic system signal correlated to damage events. The carbon fiber composite characteristic failure mechanisms are initiated on the microscale and result in a spontaneous release of elastic energy in terms of mechanical stress waves, the so-called acoustic emissions.

scholarly journals Process Optimization for Compression Molding of Carbon Fiber–Reinforced Thermosetting Polymer

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2430 ◽  
Author(s):  
Jiuming Xie ◽  
Shiyu Wang ◽  
Zhongbao Cui ◽  
Jin Wu
Keyword(s):  
Carbon Fiber ◽  
Cooling Rate ◽  
Process Parameters ◽  
Mechanical Performance ◽  
Compression Molding ◽  
Holding Time ◽  
Fiber Reinforced ◽  
Compression Pressure ◽  
Carbon Fiber Reinforced ◽  
Compression Temperature

To enhance the quality and mechanical performance of a carbon fiber–reinforced polymer (CFRP) workpiece, this paper prepares a polyacrylonitrile (PAN)-based carbon fiber–reinforced thermosetting polymer (CFRTP) laminated board through compression molding, and carries out orthogonal tests and single-factor tests to disclose the effects of different process parameters (i.e., compression temperature, compression pressure, pressure-holding time, and cooling rate) on the mechanical performance of the CFRTP workpieces. Moreover, the process parameters of compression molding were optimized based on the test results. The research results show that: The process parameters of compression molding can be ranked as compression temperature, pressure-holding time, compression pressure, cooling rate, and mold-opening temperature, in descending order of the impact on the mechanical property of the CFRTP; the optimal process parameters for compression molding include a compression temperature of 150 °C, a pressure-holding time of 20 min, a compression pressure of 50 T, a cooling rate of 3.5 °C/min, and a mold-opening temperature of 80 °C. Under this parameter combination, the tensile strength, bending strength, and the interlaminar shear strength (ILSS) of the samples were, respectively, 785.28, 680.36, and 66.15 MPa.

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