Calculate the modulus of elasticity of carbon-epoxy composite under (a) isostrain and(b) isostress conditions if the composite consists of 40% carbon fibers and 60% epoxyby volume. Also, calculate the percentage of load carried by the carbon fibers. Themodulus of elasticity of the carbon fibers and the epoxy are 350 GPa and 3.5 GPa,respectively. Comment on the results. [Ans: (a) 142.1 GPa, 98.5%; (b) 6.93 GPa, 100%]

Calculate the modulus of elasticity of carbon-epoxy composite under (a) isostrain and(b) isostress conditions if the composite consists of 40% carbon fibers and 60% epoxyby volume. Also, calculate the percentage of load carried by the carbon fibers. Themodulus of elasticity of the carbon fibers and the epoxy are 350 GPa and 3.5 GPa,respectively. Comment on the results. [Ans: (a) 142.1 GPa, 98.5%; (b) 6.93 GPa, 100%]

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.1P: In Example Problem 12.1, a uniaxial composite material is made into a circular rod Vbith a 1.27-cm...

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In Example Problem 12.1, a uniaxial composite material is made into a circular rod Vbith a 1.27-cm diameter from 70 volume percent continuous carbon fibers and 30 volume percent epoxy. The rod is subject to an axial force of 100,000 N. The composite matcrial in Example Problem 12.1 is to be replaced with a less expensive composite made of 70 volume percent continuous E-glass fibers and 30 volume percent epoxy. The elastic moduli are 5 GPa for the epoxy resin and 72.4 GPa fos the E-glass. (a) Compare the elastic modulus, composite strain, fiber and matrix stresses, and density of this composite with the carbon epoxy composite in Example Problem 12.1. Usc the density of UHM carbon, and assume the density of the epoxy is 1.2g/cm3 . (b) Can both the E-glass fiber and matrix withstand the applied force?
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