Effect of the Position of Defined Local Defect on the Mechanical Performance of Carbon-Fiber-Reinforced Plastics

Abstract

Considering their energy and resource efficiency, fiber-reinforced plastics (FRPs) have been displacing metals and metal alloys for lightweight constructions. During the semiautomated manufacturing process of FRPs, and in particular during the laying of reinforced fabric layers, foreign bodies are enclosed within them, which in turn reduce the mechanical performance of FRPs. The research project presented in this article investigated if the loss in mechanical properties, such as tensile, flexural, and impact strengths, depends on the position of defined local defects, polytetrafluorethylene (PTFE) in this case, in the thickness direction of FRPs. In order to achieve this aim, PTFE was placed in different layers of reinforcing fabric before infusion. Subsequently, the mechanical performance of the fabricated FRPs was tested and evaluated. On the basis of the experiment, it can be concluded that the loss in mechanical properties was maximal if PTFE was laid in the middle position of FRPs in the thickness direction.

Damage detection by recurrence and entropy methods on the basis of time series measured during composite milling

“…The main disadvantage of destructive method is that the tested materials cannot be further used. Nevertheless, to derive the size and position of defects, these methods are widely used [7]. Tensile, bending, and impact testing are some examples of destructive methods.…”

Effect of Defects on Progressive Failure Behavior of Plain Weave Textile Composites

“…Therefore, to design safe and economical composite structures, the effect of defects on structural integrity must be understood. For unidirectional composites, research has been conducted on the detection of fabrication defects and their effect on stiffness and strength reduction [ 27 , 28 , 29 , 30 ]. However, in the case of textile composites, defect detection studies have appeared only recently [ 31 , 32 ], and a limited number of studies have been performed on the effect of defects on stiffness and strength degradation [ 33 , 34 ].…”

Influence of Gamma Radiation on Mechanical Properties of Jute Fabric-Reinforced Polymer Composites

“…A variety of natural fibers such as banana, jute, flax, pineapple leaf, bamboo, eucalyptus pulp, coconut, palm, sansevieria leaf, sisal, sugarcane fiber, cotton, ramie bast, date, malva, abaca leaf, kenaf bast, and hemp are being used as reinforcing materials in polymer composite materials to diversify their application from the automotive to biomedical fields [5,6]. Natural fiber-reinforced polymer composites (NFRPC) are extensively attractive in diversified applications from household to aerospace settings due to their light weight, biodegradability, renewability, high strength, high stiffness, good corrosion resistivity, enhanced energy recovery, lower fabrication cost, and many more [7][8][9][10][11].…”