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A ceramic matrix composite contains internal flaws as large as 120 ?m in length. The plane strain fracture toughness of the composite is 45 MP am, and the tensile strength is 550 MPa, assume f=1.0
When a stress equal to the tensile strength is applied, what is the stress intensity factor, K?
What is the stress needed to cause the flaw to propagate?
And If a newly annealed copper wire is drawn thru a die which decreases its diameter from 3.1 mm to 2.7 mm, how much cold-work was performed?
at steady state a heat pump maintains the interior of a house at 77f by transferring to it 30 kw of heat from the
it is proposed to improve the takeoff performance of a single-engined aircraft fitted with a 50-in-diammeter propeller
a fluid flows through an adiabatic device. at one end the velocity is 30 ms h 320 kjkg and s 0.695 kjkg k and at the
which of these two processes will produce the largest amount of work? (You must provide a full explanation for your choice).
at the beginning of the compression stroke the volume of a certain diesel engine cylin-der is 1.000 liter and it is
a stationary gas turbine power plant operates on the brayton cycle and delivers 20 mw to an electric generator. the
Determine the surface temperature of the wire during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 50 km/h.
Consider the following investment opportunity: Initial Cost = $126,890; Annual Benefit = $23,000; Useful Life = 30 Years; Salvage Value = $0; What interest rate results in a Benefit Cost Ratio equal to one?
a 2.5 cm thick layer of insulation k 1.5 wm oc is applied to a plane surface so that the inner surface of the
air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17 degrees celcius.
Evaluate the reduction in pump BHP required by heating the oil from 50° F to 100° F. Suppose efficiency of 80% (HP)
a a rod of steel 0.5 m long is heated from 20 c to 80 c while its ends are maintained rigid. determine the type and
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