The strains determined by the use of the rosette attached as shown during the test of a machine element are £a = 600 um/m, £b = 450 um/m, &c = -75 pm/m. (Use E=200 GPa, v=0.3)
Determine:
(a) Draw Mohr's circle for plane strain 3D
(b) The plane strain (Ex, Ey, Yxy).
(c) principal strain (E1, E2, E3, Ymax)

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk