Experimental, Theoretical and Numerical Investigation of the Flexural Behaviour of the Composite Sandwich Panels with PV
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Experimental, Theoretical and Numerical Investigation of the Flexural Behaviour of the Composite Sandwich Panels with PVC Foam Core A. Mostafa & K. Shankar & E. V. Morozov
Received: 27 September 2013 / Accepted: 4 November 2013 # Springer Science+Business Media Dordrecht 2013
Abstract This study presents the main results of an experimental, theoretical and numerical investigation on the flexural behaviour and failure mode of composite sandwich panels primarily developed for marine applications. The face sheets of the sandwich panels are made up of glass fibre reinforced polymer (GFRP), while polyvinylchloride (PVC) foam was used as core material. Four-point bending test was carried out to investigate the flexural behaviour of the sandwich panel under quasi static load. The finite element (FE) analysis taking into account the cohesive nature of the skin-core interaction as well as the geometry and materials nonlinearity was performed, while a classical beam theory was used to estimate the flexural response. Although the FE results accurately represented the initial and post yield flexural response, the theoretical one restricted to the initial response of the sandwich panel due to the linearity assumptions. Core shear failure associate with skin-core debonding close to the loading points was the dominant failure mode observed experimentally and validated numerically and theoretically. Keywords Sandwich panel . Flexural behaviour . Polyvinylchloride foam . Glass fiber reinforced polymer
1 Introduction Composite sandwich structure is a special form of the laminated composites in which a relatively thick, soft and light weight core is sandwiched between two thin and stiff face sheets [1]. This structure possesses many features including higher bending stiffness and high strength to weight ratio compared to the monolithic structure [2]. With its innumerable advantages, the composite sandwich structure found various applications in the automotive, construction and aerospace industries. The sandwich structures also drew a lot of interest in marine industry, especially in high-speed racing and surveillance [3–5]. The hulls of most high A. Mostafa (*) : K. Shankar : E. V. Morozov School of Engineering and Information Technology, University of New South Wales at The Australian Defence Force Academy, Canberra, Australia e-mail: [email protected] A.. Mostafa e-mail: [email protected]
Appl Compos Mater
speed racing boats were mostly made out of aluminium alloys or glass fibre with the traditional core materials like honeycomb or foam core sandwich structures. The many advantages of composite sandwich structure favoured its implementation in the marine applications. Although many theories have been utilized in the analysis of the sandwich panels, limited attempts have been made to characterize the flexural response of the composite sandwich panels including the interaction between the skin and the core materials. The main reasons of that could be due to the complexity of the skin-core interaction and the lack for th
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