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A mechanical test is conducted on three different materials. In this experiment, a constant tensile stress is applied instantly to a specimen. The first material, a rubber, deforms rapidly during the application of the stress, with the extent of deformation becoming progressively less until it reaches an equilibrium gage length. The second, a thermosetting material, reacts to the applied stress by deforming almost instantaneously to an equilibrium extension. The third, a thermoplastic material, initially deforms to substantial extension in response to the stress and then deforms further with the extension varying linearly with time.
(a) Describe the behavior of each material with an appropriate combination of springs and dashpots.
(b) Describe the behavior of each material following the removal of the tensile stress.
Design a 2:1 rectangular duct and fan system to pull 40000 scfm of air carrying a medium-density dust through an FCD (Final Control Device) with a ?P of 6.0 in. H2O. Assume the duct system must extend 120-feet and has four 90° elbows.
The beam is supporting a concentrated load due to a 20 tons crane which moves from A to F. What is the maximum shear force due to the crane at support B? Also determine the maximum moment due to the crane at point B and C.
Plot the adiabatic flame temperature and kmoles of CO2, CO, and NO at equilibrium for values of percent excess air between 10 and 100 percent.
A rectangular shelf is attached to a wall by two brackets 12 inches apart at points A and B , as shown in Figure P10.17 . A wire with a 10-lbf weight attached to it is hanging from the edge of the shelf at point C . Determine the moment of force a..
A ferryboat queuing lane holds 40 vehicles. If vehicles are processed (tolls collected) at a uniform deterministic rate of 5 vehicles per minute and processing begins when the lane reaches capacity
At point 2, the velocity and pressure are 14 ft/s and 23 psi. Determine at which of these two points the elevation is higher. Calculate the height difference. (Assume the sp ecific gravity of butane is 0.6 and that the butane is at a temperature o..
Determine the rate at which heat is added in the boiler, the power required to operate the pumps, the net power produced by the cycle, and the thermal efficiency.
A 1.00 mol sample of an ideal gas (gamma = 1.40) is carried through the Carnot cycle. At point A, the pressure is 25.0 atm and the temperature is 600 K. At point C, the pressure is 1.00 atm and the temperature is 400 K.
List a few mechanistic processes for which the hydrostatic stress is likely to have a large influence on the corrosion-fatigue crack growth characteristics.
An intersection approach has three lanes, permitted left turns, and 6% left-turning volume with a through vehicle equivalent of 5.0 tvu/left turn. The saturation flow rate for through vehicles under prevailing conditions is 1,700 veh/hg/ln.
The allowable stress in a steel shaft with an outside diameter of 1.5in and an inside diameter of 1.1in is 12,000psi. What hp can the shaft deliver at 1750rpm?
A cyclone separator is being used to remove particulates from a gas stream. The current removal efficiency is 96% for an air flow rate through the separator equal to 18 m3/s. Due to a process change, the air flow rate is expected to increase to 22 m3..
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