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2003 Course Product Design & Computer Applications

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Total No. of Questions : 7] [Total No. of Pages : 4 P1191 [3664]-301 B.E. (Polymer) PRODUCT DESIGN AND COMPUTER APPLICATIONS (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to the candidates:1) Answers to the two sections should be written in separate books. 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) Explain isochronous and isometric graphs. How are they used in plastic product design? [4] b) Viscoelastic behaviour of a plastic is represented by a spring and dash pot elements with constants of 4GN/m2 and 100 GNs/m2 respectively. If a stress of 14 MPa is applied for 100 seconds and then completely removed, compare values of strain predicted by Maxwell model and Kelvin-Voight model after [6] i) ii) c) 55 seconds. 130 seconds. Illustrate Maxwell model for relaxation and creep. [6] OR Q2) a) b) Write short notes on any 2 : [6] i) Different types of mesh used in FEA. ii) Concurrent engineering approach in product design. iii) Steps followed in product design. Explain stress relaxation behaviour and creep behaviour in plastics using Kelvin-Voight model. [6] P.T.O. c) A small PP flange is 4 mm thick; It is clamped using tightening screms. This reduces its thickness by 0.08 mm. Estimate initial stress and stress after a week. Use curves supplied in Fig. 1. [4] Q3) a) Write a note on any one type of shap fit assembly used in plastic product design. [6] An orthotropic lamina of 1 mm thickness is subjected to loading conditions as shown in the figure below (fig 2). Find strains in the global direction. [6] b) E1 = 80,000 E2 = 4000 G12 = 1500 12 = 0.43 [3664]-301 2 MN m2 MN m2 MN m2 c) Give any one example of non-symmetric laminate and comment on its extensional stiffness [A], coupling stiffness [B] and bending stiffness [D] matrices. [6] OR Q4) a) Explain Tsai Hill failure theory in details. [6] b) Write a note on press fit assemblies in plastic product design. [6] c) Define load transfer length and critical fibre length for short fibre reinforced composites. Derive an expression for stress induced in the fibre for fibre length equal to the load transfer length. [6] Q5) a) Discuss Erying-Prandtl viscosity model in details. [4] b) Write a note on packing phase analysis in injection molding. [6] c) Explain various reasons for shrinkage in injection molded components. Explain the various measures used to reduce shrinkage. [6] OR Q6) a) Write a note on flow hesitation and flow leaders in injection mold design. [4] b) Discuss different types of weld lines and explain methods of eliminating the weld lines. [8] c) Discuss the Ellis viscosity model in details with its merits & [4] demerits. [3664]-301 3 SECTION - II Q7) a) Design and draw a multi impression mold for component in Fig. 3. Draw at least two views including one sectional view showing details of feed, ejection and cooling system. [40] all dimensions in mm over all thk 2mm threaded length 6mm pitch 2mm material PP b) Explain the design calculations for cams, gears if used. Give overall dimensions. [10] vvvv [3664]-301 4

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