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Comment on the effects of T-stress on the growth of a fatigue crack which initiates at the free surface of a metal and propagates into the interior of the material. Specifically, discuss in general qualitative terms the possible role of constraint and crack length in influencing the T-stress and the crack growth rates.
The velocity distribution for the flow of oil (SAE 20W) at 150 degrees between two plates is given by y(y-4) mm/s, where y is measured in mm and the space between the plates is 4mm. Determine the shear stress at each wall and the maximum shear str..
Employing the ideal gas model with constant specific heat ratio k, determine the temperature at the end of the process and the amounts of work and the heat transfer per unit mass in Btu/lb
10 kPa of pressure required to push a 3 in^2 piston 5 mm into the compacted soil. Compute the CBR (%) if the same 3 in^2 piston required 100 kPa to penetrate 5 mm in calibrated rock soil.
The bar under the applied force is now 2.448 meters long. Calculate the following for the bar: a) engineering stress, b) engineering strain, c) true strain, d) Young's modulus, e) What additional information would you need to calculate the true st..
Saturated steam (at 20 bar) is used to heat up a toluene stream from 40oC, 1 bar to 150oC, 1 bar in a heat exchanger. The toluene stream is flowing at a rate of 100 kg/min. Steam leaves the heat exchanger as a saturated liquid at 20 bar.
Helium enters an adiabatic steady-state nozzle at 200kPa and 124 degrees Celsius and 10m/s. At the nozzle exit the temperature of the helium is 100 degrees Celsius and the pressure = 150 kPa.
A PVC pipe with a diameter of 30 inches will carry a flow of 20 cfs. the bottom slope is 0.005 and the roughness coefficient is 0.015. determine the normal depth, critical depth, velocity and the froude number.
Compute the seepage velocity and estimate the hydraulic gradient in the aquifer if the porosity of the soil is 42%.
A flood control project has a construction cost during the first year of $10 million, during the second year $6 million, and during the third year $2 million. It is completed at the end of the third year and thereafter incurs an annual operating c..
What are the advantages and disadvantages of triaxial test in comparison with direct shear test
Two identical complete-mix activated sludge units are connected in series; one-half of the sludge recycle flow rate, QR, is recycled to the primary effluent pipeline which handles a flow rate Q, and the other half is recycled to the effluent line fro..
A 1-m^3 volume tank contains a mixture of 18.32 moles of oxygen, 16.40 moles of Nitrogen, and 6.15 moles of carbondioxide. What is the partial pressure of each gass componet at 25 degrees?
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