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Micromechanical analysis of FRP hybrid composite lamina for in-plane transverse loading

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Title Micromechanical analysis of FRP hybrid composite lamina for in-plane transverse loading
 
Creator Babu, K Sivaji
Rao, K Mohana
Raju, V Rama Chandra
Murthy, V Bala Krishna
Kumar, M S R Niranjan
 
Subject FEM
Hybrid FRP
Interface
Micromechanics
 
Description 382-390
In this paper, the micromechanical behaviour of the square unit cell of a hybrid fiber reinforced composite lamina consisting of graphite and boron fibers embedded in epoxy matrix, has been studied. A three-dimensional finite element model with governing boundary conditions has been developed from the unit cells of square pattern of the composite to predict the Young’s modulus (E₂) and Poisson’s ratios (ν₂₁ and ν₂₃) of graphite-boron hybrid fiber reinforced lamina for various volume fractions. The stresses at the fiber-matrix interfaces induced due to the in-plane transverse loading, that is applied to predict the in-plane transverse Young’s modulus (E₂) and the associated Poisson’s ratios, are also determined from these models. The finite element software ANSYS has been successfully executed to evaluate the properties and stresses. The variation of the stresses at the fiber-matrix interface with respect to the angular location is discussed. The Young’s modulus is found to be increasing with Vf indicating that the stiffness of the composite increases with Vf , The magnitude of the normal stresses at the fiber matrix interface are maximum at θ = 0º as the direction of the load is normal to the surface at this location. This may result in the separation of fiber and matrix leading to debonding. This analysis is useful to realize the advantages of hybrid fiber-reinforced composites in structural applications, and to identify the locations with reasons where the stresses are critical to damage the interface.
 
Date 2008-12-15T07:27:04Z
2008-12-15T07:27:04Z
2008-10
 
Type Article
 
Identifier 0971-4588
http://hdl.handle.net/123456789/2588
 
Language en_US
 
Publisher CSIR
 
Source IJEMS Vol.15(5) [October 2008]