Question

A straight rod of solid polymer is of length 1 m and diameter 10 mm. The polymer is linearly viscoelastic with a tensile creep compliance given by: D = 2- exp(-0.1t); Gpa^-1 Where t is in hours. The rod is suspended vertically and a mass of 10 kg is hung from it for 10 hours. Identify the time domain of this property test procedure.

Answer #1

a solid circular steel rod has a length of 70 mm, diameter of 20
mm, and an eccentricity(offset) of 6 mm.Syiely =300Mpa. find the
critical buckling load if its boundary condition are fixed-free(use
theoretical value in table)

A solid steel shaft, 20 mm in diameter and 1 m long, is placed
concentrically inside a hollow
duralumin shaft with inside and outside diameters of 30 mm and
33 mm respectively and a
length of 500 mm. The ends of the hollow shaft are rigidly fixed
to the solid shaft. Determine
(a) the torsional stiffness of the composite shaft
(b) the maximum torque to which the composite shaft may be
subjected if the allowable
shear stresses for steel and...

Consider a straight piece of copper wire of length 2 m and
diameter 8.5 mm that carries a current I = 9 A. There is a magnetic
field of magnitude B directed perpendicular to the wire, and the
magnetic force on the wire is just strong enough to “levitate” the
wire (i.e., the magnetic force on the wire is equal to its weight).
Find B. Hint: The density of copper is 9000 kg/m3 .

2.1Consider a solid cylindrical rod of length 0.15 m and
diameter 0.05 m. The top and bottom surfaces of the rod are
maintained at constant temperatures of 20oC and 95oC, respectively,
while the side surface is perfectly insulated. 2.1.1 Draw a diagram
to represent the situation described above. (3) 2.1.2 Determine the
rate of heat transfer through the rod if it is made of copper, k =
380 W/m? oC. (4) 2.1.3 Determine the rate of heat transfer through
the...

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