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2003 Course Mechanics of Composites

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Total No. of Questions : 12] [Total No. of Pages : 5 [3764]-364 P1566 B.E. (Polymer) MECHANICS OF COMPOSITES (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer any 3 questions from Section I and 3 questions from Section II. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Write in short about E and S type of glass fibres used in fibre reinforced composites. [3] b) Write Griffith s formula for strength of brittle fibres. [3] c) Give theoretical formulae for calculation of fibre content, density and void content. [4] d) Discuss resin transfer molding. Give schematic sketch of the process and discuss process variables. [8] OR Q2) a) Draw a schematic sketch of polar winding and give process variables for fibre met out. [6] b) Write in brief about hand lay up and spray technique and its applications. [6] c) Give Darcy s equation for resin flow and explain gel time test for determining Curing characteristics of resin catalyst combination. [6] Q3) a) A unidirectional glass epoxy lamina as shown below has following allowable stresses. i) Tensile failure strength in the longitudinal direction ii) Compressive failure strength in longitudinal direction LU = 610 MPa. iii) Tensile failure strength in transverse direction TU LU = 106 2MPa. = 31 a . P.T.O.

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