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Frictionless normal indentation of a surface by a sphere was considered in Section 13.2.1.1.
(a) Prove the statement in that section that the maximum tensile normal stress is
(b) Show that it occurs at the periphery of contact, r = a.
(c) Discuss the consequences of this maximum stress for fatigue cracking in
(a) polycrystalline aluminum oxide, (b) PMMA and (c) commercially pure aluminum during cyclic indentation.
(d) Describe qualitatively how a layer of residual compressive stress at the surface would affect the magnitude and location of this maximum stress
A rectangular lot running N-S and E-W is 150 by 100 ft. To locate contours it is divided into 50-ft square blocks, and the following rod readings are taken at the corners successively along the E-W lines, proceeding from west to east, and beginning w..
Use the data in the text for calories and take the metabolizable energy content of 1 kg of body fat to be 33,100 kJ.
A hotel room has a floor area of 10 m by 4 m and is 2.5 high and has a window which is 1.6 m high and 3 m wide. The room contains some furniture and other commodities containing 50 kg polyurethane with 25 MJ/kg and 350 kg wood with 18 MJ/kg.
An adiabatic compressor is used to bring saturated water vapor at a pressure of 103 lbf/in^2 up to 1000 lbf/in^2, where the actual exit temperatureis 1000 F. Find the compressor fficiency an the entropy generation. Is there a improvement by reducing ..
A large concrete channel holds a hydraulic jump in which the subcritical depth of flow is 2.5 m. If 40 percent of the specific energy in the flow is lost through the hydraulic jump, what is the specific discharge in this rectangular channel?
A state legislator wishes to survey residents of her district tosee what proportion of the electorate is aware of her position on using state funds to pay for abortions. a)What sample size is necessary if the 95% Confident Interval
Primary treatment removes ~25 percent of the BOD. Calculate the volume (m3) and approximate hydraulic retention time (h) of the aeration basin required to run the plant as a "high rate" facility (F/M = 2 kg BOD/kg MLSS-day).
The level of one reservoir is 500 ft above the level of the other, and water is flowing steadily through the pipe from one reservoir to the other.
Take the ambient conditions to be 265 K and 85 kPa.
The wet mass of a sample of saturated soil is 520 grams. The dry mass, after oven-drying, is 400 grams. Determine the a) water content b)void ration c)saturated unit weight, and d)effective unit weight
Compute the nominal shear strength of an M10 x 7.5 of A 572 grade 65 steel
Due to a crash at a railroad crossing, an overpass is to be constructed on an existing level highway. the existing highway has a design speed of 50 mi/h.
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