Impact behaviour and protection performance of a CFRP NPR skeleton filled with aluminum foam

Laminated composites are used in various fields for excellent properties. Study of their failure characteristics is essential in engineering. Applicability of strength of materials (SOM) approach in analysing failures and designing laminated composites with glass and carbon prepregs have been investigated through computational method. Glass fibre (GF) and carbon fibre (CF) prepreg reinforced polymeric laminas were modelled and analysed under tensile load with fixed-free boundary conditions applied at two ends. Unidirectional (UD) fibre was chosen for UD laminas form the mathematical foundation of all laminated composite analyses. Tensile loads of 1N to 5N were applied at free end with an increment of 1N. In both cases, deflections and strains were non-uniform along the length, maximum near loading-point while reducing towards the fixed end in a stepped manner. This characteristic of laminated composite is different from that of conventional materials like steel or aluminium in which uniform stress and strain is assumed throughout the length in applying SOM approach. It indicates that although SOM approach is essential for some important components design, is not sufficient for analysis and design of GF or CF prepreg reinforced laminated composite components and demands for different approach for analysis and design of such composite parts.

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Investigation of Damping Properties of Natural Fiber-Reinforced Composites at Various Impact Energy Levels

Şimşir,

Akçin Ergün,

Yavuz

2024

Polymers

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Natural fiber-reinforced composites are composite materials composed of natural fibers, such as plant fibers and synthetic biopolymers. These environmentally friendly composites are biodegradable, renewable, cheap, lightweight, and low-density, attracting attention as eco-friendly alternatives to synthetic fiber-reinforced composites. In this study, natural fiber-reinforced polymer foam core layered composites were produced for the automotive industry. Fabrics woven from goat wool were used as the natural fiber. Polymer foam with expanded polystyrene (EPS) and extruded polystyrene (XPS) structures was used as the core material. During production, fibers were bonded to the upper and lower layers of the core structures using resin. The hand lay-up method was used in production. After resin application, the samples were cured under a heated press for 2 h. After the production was completed, the material was cut according to the standards (10-20-30 Joule), and impact and bending tests were conducted at three different energy levels. The experiments revealed that at 10 J, the material exhibited rebound; at 20 J, it showed resistance to stabbing; and at 30 J, it experienced penetration. While EPS foam demonstrated higher impact resistance in the 10 J test, it was found that XPS foam exhibited better impact resistance and absorption capabilities in the 20 J and 30 J tests. Due to the open and semi-closed cell structure of EPS foams and the closed cell structure of XPS foams, it has been concluded that XPS foams exhibit higher impact resistance and better energy absorption properties

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Impact behaviour and protection performance of a CFRP NPR skeleton filled with aluminum foam

Cited by 4 publications

References 36 publications

Mechanical behaviors of composite auxetic structures under quasi-static compression and dynamic impact

Mechanical behaviors of composite auxetic structures under quasi-static compression and dynamic impact

Comparative applicability of strength of materials approach to laminated composites with glass and carbon fibre prepregs

Investigation of Damping Properties of Natural Fiber-Reinforced Composites at Various Impact Energy Levels

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