Essay Example on Fibre composite material are popular in most of Structures








Fibre composite material are popular in most of structures in the structural commercial aerospace and marine industries The fibre composite materials show the best properties over the metal alloys in most of the structural industry when they design in a perfect manner These have high strength to weight and stiffness to weight ratio as well as have corrosive resistance and fatigue Jones 1999 The fibre composite material is generally incorporated with two components as fibre and matrix Fibre is the main constituent which contributed to the mechanical properties of composites and the matrix usually resin is to support and protect the fibres while transferring load between the broken fibres The woven fibre in the sense having two fibre bundles which called as yarns weaved one over another in both warp and weft direction Then the properties of this is depended on the pattern of weave and number of plies used in the directions

The two main properties of heterogeneous and anisotropic made the analysis of bending behaviour of thin woven composites more crucial Already existing theories are predicting the properties of woven composites with much percentage of errors compared to the experimental values because of some macroscopic assumptions But in the microscopical analysis end up with the great accuracy level if the design geometry is perfectly undertaken Classical Lamination Theory CLT is used to calculate the in plane properties of thin woven composites at a good accuracy level But the problem here is the theory assumes that a plane stress state is exist while ignoring the interlaminar stresses which actually causing failures And it assumes that the fibres are uniformly distributed in each lamina So the bending properties of thin woven fibre composites calculated using CLT was varied with the experimental values In bending strains or stresses errors up to 200 and in bending stiffness errors up to 400 occurred Soykasap 2005 So many finite models were developed over the years by various peoples to capture the bending properties of the fibre composites But the researches were not captured exact results in these properties Because it shows a non linear bending behaviour and actual weave geometry is to be achieved in the micromechanical modelling part Thin woven fibre composite materials are nowadays trending in the aerospace applications which are weight sensitive applications Increasing demand of the thin woven fibre composite materials in the space applications is mainly due to its symmetrical and balanced properties Specifically the main usage of this is in the ultra thin deployable structures such as DLR s ultralight weight deployable booms and ultrathin deployable reflectors

Mallikarachchi 2012 Obviously the fibres are weak in bending due to its high length to diameter ratio and therefore it is more flexible perpendicular to the fibre direction So the woven nature is increasing its stiffness in the composite According to the woven nature and no of plies in the yarns the bending properties tend to vary Therefore predicting the bending properties of thin woven fibre composites is very much important for the aerospace industry As there is no exact theory for predicting this nonlinear bending behaviour the finite element modelling is the better way in a cost effective manner rather than going with experimentation So that the research is focusing on the micromechanical modelling using a commercial finite element software This research mainly focusing into the micromechanical study of the plain weave style of two ply woven fibre composites As considering two ply woven fibre composite the research will be basically started on the in phase fibre configuration in the model with solid elements The solid element is selected as in the previous research 

Mallikarachchi 2012 they obtained considerably acceptable result with modelling using the solid elements Due to the time constraint the research cannot allocate time for the experimental aspects to validate the answer Therefore the experimental data will be obtained from outsource Identifying the appropriate representation for the actual weave geometry of the thin woven fibre composite and simulating the axial and bending properties using a commercial finite element software package After thoroughly reviewing the research papers on the relevant research area current problems and other developed approaches on micromechanical modelling can be clearly identified And therefore the appropriate modelling technique will be defined Then the material properties of the thin woven fibre composites will be obtained The amplitude wavelength and cross sectional area of the fibre will be obtained using the image from micrographs and scaling that using AutoCAD software and other properties will be derived using fibre volume ratio and rule of mixture Then actual weave geometry of the representative unit volume element of yarn will be modelled representing the woven fibre composite considering the interactions between the fibre and the resin Finite element model will be carried out using a commercial finite element package most preferably Abaqus For each model created the in plane properties will be verified before continuing the rest of the research Then bending simulation will be done and the results will be compared with the predicted CLT values as well as the experimental data

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