i need the answer quickly 3. A steel bar 600mm long and having 30mm diameter, is turned down to 25mmdiameter for one fourth of its length. It is heated at 30 C above roomtemperature, clamped at both ends and then allowed to cool to roomtemperature. If the distance between the clamps is unchanged, the maximumstress in the bar ( a 12.5 x 10 per C and E 200 GN/m) is

Given Data D1=30 mm L=600 mm D2=25 mm ∆T=30°C a = 12.5 x 10-6 per C E=200 GN/m^ 2

Answered: 3. A steel bar 600mm long and having…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.53P

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1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 870°C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 1040°C on the hot side and 200°C on the cold side. If the maximum amount of heat transfer permissible is 950 , determine the most economical arrangement using the available bricks.
A wine of length L = 4 ft and diameter d = 0.125 in. is stretched by tensile forces P = 600 lb. The wire is made of a copper alloy having a stress-strain relationship that may be described mathematically by =18,0001+30000.03(=ksi) in which is nondimensional and has units of kips per square inch (ksi). (a) Construct a stress-strain diagram for the material. (bj Determine the elongation, of the wire due to the Forces P. (c) IF the forces are removed, what is the permanent set of the bar? (d) If the forces are applied again, what is the proportional limit?
Kindly show a step-by-step solution. Thank you A 6m rod with a 4mm gap between one of its ends and the surface of the wall next to it is secured solidly between two walls at 25°C. Calculate the highest temperature that the rod can withstand in degrees celsius while taking into account the maximum limiting stress of 67 MPa, where a = 19.5 m/mC°, and E = 130 GPa.
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