Search

The application of composite materials has increased so drastically in the aerospace industry. The Impact strength signifies the importance of composite materials when exposed to suddenly applied loads. This paper is focused on describing the behavior of interwoven kevlar/glass-epoxy and kevlar/basalt-epoxy composite laminate under high-velocity bullet impact. The composite lamina of kevlar/glass and that of kevlar/basalt are prepared using three different weaving techniques. The composite laminates are prepared using the compression moulding technique. The laminates have been subjected to high-velocity bullet impact. The velocity range is from 220 m/s to 260 m/s. The impact damage area in the laminate has been assessed through ultrasonic pulse echo submerged nondestructive technique. The impact strength has been calculated using the damaged area derived using the impact energy absorbed by the laminate. The results have shown that the maximum impact which found out to be kevlar/basalt (KB 1 × 1) is 28.24 J/cm2. [ABSTRACT FROM AUTHOR]

The use of composites has increased exponentially in most industries, especially in the aerospace industry; the usage of composites has increased by almost 40% in the last 15 years. Aerospace components are often subject to high-impact loads, so it is important to use impact-resistant materials. Kevlar is known for its high-impact resistance and is commonly used as a fiber with various resins to achieve the desired properties. This paper mainly focuses on weaving Kevlar with basalt fiber in plain weave type by the traditional handloom weaving method. The epoxy resin, along with the harder, is then mixed with the aluminum oxide nanoparticles (Al2O3) in different percentages [1%-KB1, 3%-KB2, and 5%-KB3] to form the matrix. The laminate fabricated is then subjected to the high-velocity bullet impact of around 250 m/s. A steel hemispherical head projectile was used in the testing, and it was found to be penetrated through all the specimens making holes. The impact strength for all the different specimens was then estimated by calculating the bullet damage area and energy absorbed. The plate added with 3% Al2O3 nanoparticle was found to have improved impact strength when compared with the other two specimens. This plate can be used for bulletproof and other high-velocity impact applications. [ABSTRACT FROM AUTHOR]

Composites are selected primarily for maintaining relative stiffness, strength and are light weight for a component. This paper provides an analysis of hybrid composite laminate, which are alkali treated and non-alkali treated to differentiate the mechanical properties between them. The properties of the composite laminates also differ by various types of fabrication process used. This is verified by various mechanical tests performed. In this work, three individual fibers namely Kevlar, Kenaf and Jute are combined to form a hybrid composite laminate. Alkali treatment is done for a set of Kevlar, Kenaf and Jute as a surface treatment. Vacuum Infusion and Hand Layup technique are the process used for the fabrication of composite laminates. Tensile, Flexural and Charpy are the tests done to determine the mechanical properties of composite laminates. The final outcome of the work describes that the Kevlar/Jute/Kenaf/Kevlar/Jute/Kenaf/Kevlar/Jute/Kenaf/Kevlar/Jute/Kenaf of the composite laminate possess higher Flexural and Impact strength when compared to Kevlar/Kenaf/Jute/Kevlar/Kenaf/Jute/ Kevlar/Kenaf/Jute/Kevlar/Kenaf/Jute. The alkali treatment also helps out in advancing the tensile properties. [ABSTRACT FROM AUTHOR]