Download "UNIT I SIMPLE STRESSES AND STRAINS"
1 Subject with Code : SM-1(15A01303) Year & Sem: II-B.Tech & I-Sem SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR Siddharth Nagar, Narayanavanam Road QUESTION BANK (DESCRIPTIVE) UNIT I SIMPLE STRESSES AND STRAINS Course & Branch: B.Tech - CE Regulation: R15 1. a) Derive the relation between E and K. b) Determine poisons ratio and bulk modulus of the material for which E=1.2X10 5 N/mm 2 and G is 4.8X10 4 N/mm a) Derive the relation between E and C. b) A bar of 30mm dia is subjected to a pull of 60KN. The measurement extension on guage length of 200mm is 0.1mm and change in dia is 0.004mm. calculate E, poisons ratio and K. 3. The following data refer to a mild steel specimen tested in a laboratory: Diameter of the specimen = 30 mm Length of the specimen = 250 mm Extension under a load of 15 kn = mm Load at yield point = 125 Kn Maximum load = 240 kn Length of the specimen after failure = 410 mm & Neck diameter = 18 mm. Determine: (i) Young s modulus. (ii) Yield point. (iii) Ultimate stress. (iv) Percentage of elongation. (v) Percentage reduction in area. (vi) Safe stress adopting a factorof safety of Three bars made of copper; zinc and aluminum are of equal length and have cross section 500, 700, and 1000 mm 2 respectively. They are rigidly connected at their ends. Of this compound member is subjected to a longitudinal pull of 250KN, estimate the proportional of the load carried on each rod and the induced stresses. Take the values of E for copper =1.3 x 10 5 N/mm 2 and for zinc=1.0x10 5 N/mm2 and for aluminum=0.8 x 10 5 N/mm A metallic bar 300 mm x 100 mm x 50 mm is subjected to a force of 6 kn (tensile), 8 kn (tensile) and 5 kn(tensile) along x, y and z direction respectively. Determine the change in the volume of the block. Take E = 2 x 10 5 N/mm 2 and Poisson s ratio = 0.25.