scholarly journals Cure Cycle Effect on High-Temperature Polymer Composite Structures Molded by VARTM

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ahmed Khattab
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Composite Structures ◽  
Three Dimensional ◽  
Composite Part ◽  
Cure Cycle ◽  
Transient Energy ◽  
Process Behavior ◽  
Vartm Process

This paper presents an analytical and experimental investigation of cure cycle effect on carbon-fiber reinforced high-temperature polymer composite structures molded by vacuum assisted resin transfer molding (VARTM). The molded composite structure consists of AS4-8 harness carbon-fiber fabrics and a high-temperature polymer (Cycom 5250-4-RTM). Thermal and resin cure analysis is performed to model the cure cycle of the VARTM process. The temperature and cure variations with time are determined by solving the three-dimensional transient energy and species equations within the composite part. Several case studies were investigated by the developed analytical model. The same cases were also experimentally investigated to determine the ultimate tensile strength for each case. This study helps in developing a science based technology for the VARTM process for the understanding of the process behavior and the effect of the cure cycle on the properties of the molded high-temperature polymer composites.

scholarly journals Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

2020 ◽  
Vol 10 (6) ◽  
pp. 1924 ◽  
Author(s):  
Yu Sun ◽  
Yuguo Sun
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
High Temperature Oxidation ◽  
Phenolic Resin ◽  
Three Dimensional ◽  
Silicon Oxycarbide ◽  
Fiber Reinforced ◽  
Absorption Properties ◽  
Temperature Oxidation ◽  
Carbon Fiber Reinforced

This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

scholarly journals Prospects for the Use of Secondary Carbon Fibers

2020 ◽  
Vol 6 (3) ◽  
pp. 39-43
Author(s):  
G. Shaidurova ◽  
E. Gatina ◽  
Ya. Shevyakov
Keyword(s):  
Composite Material ◽  
Life Cycle ◽  
High Temperature ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Carbon Fibers ◽  
Polymer Composite Material ◽  
Physicomechanical Characteristics ◽  
Secondary Carbon

The results of studies on the possibility of using secondary carbon fiber extracted from the volume of spent polymer composite material by high-temperature pyrolysis for reinforcing chipboards are reflected. Studies were conducted on the physicomechanical characteristics of reinforced slabs, which showed a significant increase in performance. The results obtained make it possible to assess the possibility of the promising use of secondary fibers, which will provide a solution to the problem of completing the life cycle of polymer composite materials.

Effects of High Temperature on Tensile and Bending Strengths of T300 Carbon Fiber Three Dimensional Braided Composites

2012 ◽  
Vol 602-604 ◽  
pp. 23-27 ◽  
Author(s):  
Qian Liu ◽  
Jian Yang ◽  
Ye Hong He ◽  
Jia Lu Li
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Carbon Fiber ◽  
Bending Strength ◽  
Three Dimensional ◽  
Effect Of Temperature ◽  
Resin Composites ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Average Tensile Strength

In this paper, the tensile and bending strengths of T-300 carbon fiber three dimensional braided/epoxy resin composites at 23 oC and 150 oC were researched. The results indicate that the effect of temperature on the tensile strength and bending strength of three dimensional braided composites is sentitive. However high temperature makes bending strength of 3D braided composites lost more than that of tensile strength of 3D braided composites. The average tensile strength of 3D braided composites at 150 oC is 65.06% of average tensile strength of 3D braided composites at 23 oC. The average bending strength of 3D braided composites at 150 oC is only 11.44% of average bending strength of 3D braided composites at 23 oC. This means that application temperature should be taken into account when 3D braided composites are used.

Experimentation and Modeling for the Investigation of Fast Remotely Actuated Channeling in the VARTM Process

2001 ◽  
Author(s):  
Roopesh Mathur ◽  
Dirk Heider ◽  
Suresh G. Advani ◽  
Shawn Walsh ◽  
Elias J. Rigas ◽  
...  
Keyword(s):  
Analytical Model ◽  
Composite Structures ◽  
Large Scale ◽  
Single Channel ◽  
Three Dimensional ◽  
Resin Flow ◽  
Ground Vehicles ◽  
Test Bed ◽  
Molding Process ◽  
Vartm Process

Abstract The Vacuum Assisted Resin Transfer Molding Process is a composite manufacturing process that is widely used for the manufacture of large and complex three-dimensional composite structures such as bridges, ground vehicles, hull structures and ship sections. Fast remotely actuated channeling (FASTRAC) uses a unique double-vacuum bag, which creates distribution channels for optimal resin flow during impregnation. By controlling the application of the second vacuum bag it is possible to control the surface resin flow and the impregnation of the preform thus allows a significant reduction in labor and waste Process modeling and simulation are necessary in order to optimize this novel process for large-scale applications. Experiments were conducted using a VARTM test-bed for single channel injection and the resin flow was measured using sensors. An analytical model was developed for the flow of resin in the FASTRAC process. The results of the experiments and analytical model are presented in this paper.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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