Investigation of Flexural strength of Sandwich Panels Recycled Carbon Fibre/Polyester with Cotton Mesh Fabric Reinforcement in Polyurethane Core

Ganjar Pramudi; WijangWisnu Raharjo; Dody Ariawan

doi:10.6180/jase.202210_25(5).0013

Investigation of Flexural strength of Sandwich Panels Recycled Carbon Fibre/Polyester with Cotton Mesh Fabric Reinforcement in Polyurethane Core

Ganjar Pramudi¹, WijangWisnu Raharjo This email address is being protected from spambots. You need JavaScript enabled to view it.², and Dody Ariawan²

¹Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta, Indonesia
²Mechanical Engineering Department, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta 57126, Indonesia

Received: October 22, 2021
Accepted: December 16, 2021
Publication Date: December 23, 2021

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202210_25(5).0013

ABSTRACT

Sandwich panels composed of two skins separated by a core in the middle have attracted many researchers to develop lightweight structural materials that can be assembled quickly. This article will discuss the flexural strength of each skin, core, and sandwich panel. The composite sandwich skin is made of Recycled Carbon Fibre (RCF)/unsaturated polyester with a thickness of 2 mm. The face has a low density of 1.6 g/cm³ and is more economical because of the recycled carbon fibre. RCF was taken through the solvolysis process by degrading the resin on the carbon fibre. Polyurethane reinforced with five layers of Cotton Mesh Fabric (CMF) is used as the core with various thicknesses of 50 mm, 75 mm, and 100 mm. CMF reinforcement made of polyester has a density of 0.03 g/cm³. The results showed that increasing the fiber content by 40% raised the RCF/unsaturated polyester skin’s bending strength to 220.7 MPa. Due to the higher fibre content, stress can be spread evenly. In addition, the flexural strength of the polyurethane core increases up to 2.1 MPa with the addition of CMF. Sandwiches with a 50 mm core have a flexural strength of 59.07 MPa. It is higher than the 75 mm and 100 mm thicknesses. It is due to an increase in the moment of inertia and stiffness of the composite material. This lightweight and strong sandwich composite can be used as an earthquake-resistant wall panel.

Keywords: Cotton Mesh Fabric, Sandwich Panel, Core Polyurethane, Skin Recycled Carbon Fiber

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