Experimental and numerical investigation of reduction in shape distortion for angled composite parts
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ORIGINAL RESEARCH
Experimental and numerical investigation of reduction in shape distortion for angled composite parts Khubab Shaker 1 & Yasir Nawab 1
&
Abdelghani Saouab 2
Received: 28 May 2019 / Accepted: 4 September 2019 # Springer-Verlag France SAS, part of Springer Nature 2019
Abstract Controlling the fabrication process induced shape distortion in composite parts is a concern of composite industry and relevant researchers in the recent year. This study focused on the numerical as well as experimental investigation of the effect of addition of silica microparticles on the mechanical properties and the cured shape of glass/vinyl ester angled composite parts. UD glass fabric/ vinyl ester laminated composite parts were fabricated without and with the addition of silica microparticles. The thermal and mechanical properties of resin samples containing silica particles were characterised using Dilatometer and Universal Testing Machine. It was found that the addition of silica microparticles has reduced the thermal expansion coefficients (CTE) and increased the modulus of resin. These thermal and mechanical properties were then used as matrix properties for three-phase composite laminated parts. The analytical micromechanical model was used to determine the thermomechanical properties of composite lamina. The numerical investigations of spring-in in angled composite parts were performed on commercial FEA software, COMSOL Multiphysics® (v5.4). The experimental results showed that the angled part without any fillers had a higher spring-in value of 1.807°, while the other part having 5% fillers exhibited a lower spring-in value of 0.632° only. The numerical results were found to be in close agreement with the experimental results. Keywords Numerical approach . Angled brackets . Silica particles . Residual stresses . Shape distortion . Spring-in
Introduction The polymeric composite materials are being used for numerous applications, due to the flexibility of design in terms of reinforcement and matrix. But the fabrication of composite material is a complex process involving simultaneous physical and chemical changes [1]. The physical changes include the transition of resin from fluid to rubbery solid and then glassy solid due
* Yasir Nawab [email protected] Khubab Shaker [email protected] Abdelghani Saouab [email protected] 1
National Textile University, National Center for Composite Materials, Faisalabad, Pakistan
2
Laboratoire Ondes et Milieux Complexes, UMR 6294 CNRS, le Havre Université, 53 rue Prony, CS 80540, 76058 Le Havre, Cedex, France
to the curing of thermosetting resin. These phenomena ultimately lead to the development of residual stress in the composite parts and ultimately the shape distortion [2]. The causes of process induced residual stress are broadly categorised as the mismatch thermal expansion, chemical shrinkage, hygroscopic nature of fibres and tool part interaction [3–5]. But in the case of laminated composites, the stacking sequence of plies is a major source
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