Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 12.15, Problem 44AAP
To determine
The strength of the composite material.
The fraction of the load carried by the carbon fibers.
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Chapter 12 Solutions
Foundations of Materials Science and Engineering
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- Calculate the density of a composite made with 35% Kevlar-49 fibers in an epoxy resin (ρ = 1.1 kg/m3, E = 2.5 GPa). For Kevlar-49, Ef = 131 GPa; density = 1440 kg/m3arrow_forwardAn epoxy (E = 3.25 GPa) is reinforced with 55 vol% E-glass (E = 79 GPa). The fibres are continuous and aligned. Assuming no voids, compute the modulus of elasticity in the longitudinal and transverse (lateral) directions. Select one: a. Longitudinal modulus = 25.1 GPa, Transverse (lateral) modulus = 44.9 GPa b. Longitudinal modulus = 44.9 GPa, Transverse (lateral) modulus = 6.9 GPa c. Longitudinal modulus = 6.9 GPa, Transverse (lateral) modulus = 74.2 GPa d. Longitudinal modulus = 74.2 GPa, Transverse (lateral) modulus = 25.1 GPaarrow_forwardA discontinuous fibre reinforced composite consists of 20mm long carbon fibres in a polymer matrix. The volume fraction of the composite is 0.5, interfacial shear strength 5MPa and the critical fibre length 2.5mm. The fibre modulus is 250GPa and strain to failure 1.5%. The matrix modulus is 3.5GPa and failure strain 10%. If the ultimate fibre strength = 3500MPa, calculate the average failure stress in the composite. Answer: 2584arrow_forward
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