City Guilds Model Questions Vol1 2019 Engineering Question 41
Practice objective / multiple choice question 41 from the 2019 City Guilds Model Questions Vol1 Engineering examination.
A composite material consists of carbon fibres and an epoxy matrix. The tensile strength of the epoxy is \(55\) MPa. The overall tensile strength of the composite, measured experimentally, is \(210\) MPa. The fibre volume fraction is \(V_f = 0.60\). (a) Determine the tensile strength of the fibre material. (b) Assuming the Young's modulus of the epoxy is \(3\) GPa and that the fibre modulus relates to its tensile strength by \(E_f = 5\,\sigma_f\) (with \(\sigma_f\) in GPa and \(E_f\) in GPa), calculate the Young's modulus of the composite using the rule of mixtures and state whether it satisfies a design requirement of at least \(2.0\) GPa.
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This is City Guilds Model Questions Vol1 2019 Engineering Question 41. It is one of the objective questions from the 2019 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Medium .
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