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A wing panel of a supersonic aircraft is made from a titanium alloy that has yield strength 1035 MPa and toughness KIc = 55 MPa√m. It is 3.0 mm thick, 2.40 m long, and 2.40 m wide. In service it is subjected to a cyclic stress of ±700 MPa, which is not enough to cause yielding but does cause gradual crack growth of a preexisting crack normal to the loading direction at the edge of the panel. Assume that the crack is initially 0.5 mm long and grows at a constant rate of da/dN = 120.
Define and give the dimensions of thermal conductivity k, thermal diffusivity a,heat capacity C, heat flux q, and combined energy flux e. For the dimensions use m = mass, I = length, T = temperature, and t = time.
the stators in a gas turbine are designed to increase the kinetic energy of the gas passing through them adiabatically.
Diffusion of carbon into BCC iron for 12 hours at a temperature of 5000C results in a carbon concentration of 0.2 wt% at a depth 2 mm from the surface. At what depth would the concentration be 0.2 wt%, if the diffusion occurred for 6 hours at 8000C?
a paper mill has two steam generators one at 4.5mpa 300 c and one at 8mpa 500 c. each generator feeds a seperate
water specific heat 4.2 kjkg c at the rate of 120 kgmin is heated from 20 to 70 c by an oil having a specific heat of
descriptive questions - give brief answers in words. no calculations are required. you may write your answers in point
if the head loss in 30 m 100 ft of 75 mm 3 in. pipe is 7.6 m 25 ft when a certain quantity of water flows therein what
The yearly average solar flux incident on a horizontal surface in the United States is about 180 W/m2. The average total energy demand in the United States is approximately 100 quads (100 × 1018 ) per year. Assuming an average efficiency of PV cells ..
magnetic tape is being fed over and around the two light pulleys which both rotate about fixed axes. if the speed v of
A concentric cylinder viscometer may be formed by rotating the inner member of a pair of closely fitting cylinders (see Figure 1). For small clearances, a linear velocity profile may be assumed in the liquid filling the annular clearance gap. A visco..
a 2 kg block of wood rest on the table top. A 7g bullet is shot straight up through a hole inthe table beneath the block. the bullet lodge in the block and the flies 25 cm above the table top. how fast was the bullet going initial?
The Young's modulus of steel is higher than that of Al (29.0 x 106 psi vs. 10.5 x 106 psi). However, for many applications such as automotive and aerospace a more important quantity is the "specific modulus," or modulus/density. Determine the speci..
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