Characterization of discontinuous carbon fiber liquid molded PA-6 composites via strategic placement of additional reinforcements

Abstract

The flexibility of processing PA6-based discontinuous carbon fiber panels using vacuum-assisted resin transfer molding was studied. The ease of incorporating various reinforcements namely baseline, tow in the center of preform, fabric in the center of preform and fabric on the outside as skin was investigated. Mechanical characterization was conducted on all the variations made. There was an average increase of about 3%, 20% and 47% in the tensile properties of tow in the center, fabric in the center and fabric on the outside as skin, respectively, as compared to the baseline. A similar increase in properties was noticed in its flexural and impact strength. The data showed a correlation between the mechanical properties and the total surface area of additional reinforcements used. As the surface area of the reinforcement increased, the mechanical properties increased as well. It also showed that reinforcements on the surface of the preform as a skin performed the best. DMA analysis showed the effect of reinforcement on the storage modulus and tan delta across temperatures ranging from 30°C to 150°C. SEM analysis showed that the fibers and the additional reinforcements were coated with PA6 which translated into consistent mechanical performance.

Development and Testing of High Performance Nylon12 (PA12) Based Natural Fiber Composites

“…the bottom side of the sample. This is a typical mode of failure in discontinuous fiber composites [18,21]. The neat PA12 had a lot of crazing before failure occurred.…”

“…The results from the tensile tests for these samples are mentioned in the results and discussion sections. Once the fibers are treated using NaOH as mentioned in the previous section, they are then made into preforms by using a process called hydroentanglement [2,21]. The basic setup of the process is shown in figure 5.…”

“…One of the reasons for the fiber pull-out can be attributed to the clumping of fibers during the hydroentanglement process. As the fiber web density increases due to the addition of more fibers, the tendency to form clumps also increases [21]. This clumping seemed to leave a few fibers with minimal bonding with the resin leading to a poor interface in certain section of the composite.…”

Development of hemp fiber composites with recycled high density polyethylene grocery bags

“…The complete diagram for this process is shown in Figure 1a. This method has been used in previous research [35][36][37] and similar steps were followed to make fiber mats for this study. The mats were then dried for a period of 5 hr at 80 C prior to being used.…”

Monitoring of mechanical properties of prestressed glass fiber epoxy composites over 12 months after fabrication

“…The remarkable properties of fiber-reinforced polymer (FRP) composites such as high specific strength, high specific stiffness, and corrosion resistance make them attractive to many industries such as automotive, energy, and aerospace. 1,2 FRP composites are generally consist of high-performance fibers such as carbon, aramid, or glass molded in polymer matrix like polypropylene, polyethylene, epoxy, or vinyl-ester. 3 The specific combination of the glass fiber and epoxy matrix are the preferred materials for many industrial applications such as windmill blades, aircraft, and pipelines, 1,3,4 just to name a few.…”