Download JNTUA M.Tech 2nd Sem Reg-Supply 2018 Aug-Sept 9D04206c Mechanics And Manufacturing Methods of Composites Question Paper

M.Tech II Semester Supplementary Examinations August/September 2018

MECHANICS & MANUFACTURING METHODS OF COMPOSITES

(Common to CAD/CAM & PEED)

(For students admitted in 2013, 2014, 2015 & 2016 only)

Time: 3 hours                                                                                          Max. Marks: 60

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Answer any FIVE questions

All questions carry equal marks

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1. What are the different types of composites used in industry? Also list out their aerospace and structural applications.
2. For a glass epoxy composite E₁ = 85 GPa, Em = 3.4 GPa, Poisson's ratio Vm = 0.3 and V = 0.25. Find the minor Poisson's ratio V21 and G21 for a fiber volume fraction of 60%.

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3. Obtain an expression for the longitudinal tensile strength, minimum fiber volume fraction and critical fiber volume fraction of a unidirectional lamina using mechanics of material approach.
4. What is Hooke's law? Derive the Hooke's law for the two dimensional unidirectional lamina.
5. Explain the various features of the following laminates:
   1. Cross - ply laminates.
   2. Angle - ply laminates.

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6. Discuss the following in detail:
   1. Free - edge effects.
   2. Failure envelope.
7. Derive the governing differential equation for a laminated unidirectional anisotropic plate and deduce the conditions for orthotropic and isotropic plates.
8. Explain the following in detail:
   1. Resin transfer molding.

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   2. Preparation of fiber reinforced laminates by hand lay – up.

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