Experimental Determination of Fracture Toughness of Woven/Chopped Glass Fiber Hybrid Reinforced Thermoplastic Composite Laminates

Abstract

Polymer composites have a wide share among engineering materials. It is important that the material properties are known before being used in industrial applications. Damage behavior needs to be determined in order to safely forming of laminated composites. Propagation characteristics of existing cracks for determining damage are among the current research topics of the researchers. In this study, the fracture toughness of the composite structure was investigated by performing compact tensile and compact compression tests for hybrid fiber reinforced polypropylene composite laminates which have three types of composition having various thicknesses and fiber contents, woven and/or chopped glass fiber reinforcement. The critical energy release rates of fiber and matrix in both tensile and compressive fracture cases were determined in pre-cracked specimens under plane-strain loading conditions. The damage mechanisms of the composite materials used in the present study were described as fiber breakage/buckling of longitudinal and matrix crack/crushing of transverse. As a result of the longitudinal tension, the damage progressed gradually as translaminar fiber breaking in materials containing continuous fibers. In the transverse tension process, fiber-matrix separation caused 2 intralaminar deformation in the materials. The highest fracture critical energy release rate was found in the material with the maximal fiber layer.

Effect of temperature on the mixed mode I/II translaminar fracture of laminated composites reinforced with natural fibers

“…These values correspond to three values of load in the load-displacement curve of each fracture sample, i.e., P NL , P VIS , and P MAX . Some investigators [34,35] have expressed that the crack growth initiation occurs when P NL . The others have believed that the crack growth initiation in the laminated composites happens at P = P MAX [6,29,30].…”

Development and Analysis of Friction Material for Eco-Friendly Brake Pad Using Seashell Composite

“…Brake pads consist of four major materials: binders, fillers, friction materials, and reinforcements [3][4][5][6]. Friction materials play an important role in the brake system since the pad's crucial part decelerates and stops the wheel's rotation and is majorly made of composite materials [7,8]. In the past, asbestos was used as the frictional material in brake pads.…”