EXAMPLE 1.39. A composite bar made up of aluminium and steel held between two supports as shown in Fig. 1.55. The bars are stress iree at the tcmperature of 8°C. What will be the tresses in the two bars when the errc if, (a) the supports are unyielding, and (b) the иррorts сomе пеarer each other by 0.1 mm. li can be assumed that the change of temperature is uniform all along the length of the bar, E for steel= 2.1x 10 kg/cm, E for alu- minium-7.4x 10% kg/cm², x 104 per °C; aAL for aluminium=23.4 x 10³ per °C. Steel bar dia. 50 mm Aluminium bar dia. 25 mm temperatnre is to 60 cm *-30 cm- %3D Fig. 1.55 coefficient of expansion for steel a, 11.7 (4.M.I.E.) %3D %3D

A round cast iron column 5m long and 299mm ...

Question 3 (a) One end of a wire of length L and diameter d is attached to a high ceiling. The wire hangs vertically under its own weight. Under these conditions: (i) Calculate the highest stress in the wire (ii) Calculate the elongation of the wire (b) If the wire is now laying horizontally on a smooth surface and attached to a wall at one end, what force must be applied to the other end of the wire for the elongation to be the same as in part (a). Assume the following properties for the wire: E=29 x 10° psi, d=0.50 in, L=60 ft and specific weight of y=0.284 1b/in³.

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A cylinder head of a steam engine is held on by 14bolts. The effective diameter of the cylinder is 35cm and the steam pressure is 85N/mm².Assuming that the bolts are not initially stressed; find the size of bolts if the tensile stress is not to exceed 20N/mm²