Question

Q2 (a) One of the strategies for material selection is screening and ranking. Give definition of screening process in term of material selection. (1 mark) (b) Explain the function, objective and constraints for each case study. (i) A design of cylindrical tie-rod of specified length 1, to carry a tensile force F without failure, it is to be of minimum mass. Think of golf-club shafts. Consider, then a light beam of square section b xb and length 1 loaded in bending which must meet a constraint on its stiffness S, meaning that it must not deflect more than under a load F. We seek for the cheapest legs of a table (cylindrical column) of a specified height, 1, which will safely support a load F. (9 marks)

Answer 1

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a) In screening process of material selection, a list of suitable materials is prepared and then the materials that cannot serve the intended function are eliminated. Thus we get a reduced list of materials.