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1. What percent reduction of the elastic modulus of alumina would be caused by 1% porosity?
2. Pottery is generally ?red at a high temperature; then it is cooled and a glaze is applied. On reheating, the glaze melts and spreads over the surface. On cooling again, residual stresses may develop in the glaze. To ensure that these are compres- sive, what relation is necessary between the properties of the body of the ceramic and of the glaze?
3. Why is there so little concern about thermal shock in metals and polymers, whereas there is much concern with ceramics? Why aren't the parameters R1 = σ f (1 - 2u)/(Eα) and R2 = KIc/(Eα) useful in predicting fracture in metals?
Consider a regenerative vapor power cycle with two feed water heaters, a closed one and an open one, as shown in the figure. Steam enters the first turbine stage at 12 MPa, 480°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the ..
a compressor operating adiabatically is to compress 2.83 m3min of air at 29.4 c and 102.7 knm2 to 311.6 knm2. calculate
a fluid flows in a pipe with a sudden increase in its cross section as shown in the sketch. assume that the pressure in
the piston-cylinder device initially contains 0.05m3 of saturated liquid water at 30c. the spring is set such that the
Consider a short cylinder whose top and bottom surfaces are insulated. The cylinder was initially at a uniform temperature of Ti. At time t=0, the cylinder is suddenly subjected to a convection from its side surface to a surrounding fluid at temperat..
Determine the natural frequencies of the system-For the baseline system and find a design that changes the ?rst two natural frequencies more than any of the previous slight modi?cations.
a mass of 1 kg of air contained in a cylinder at 1.5 mpa 1000 k expands in a reversible isothermal process to a volume
carbon dioxide enters an adiabatic compressor at 100 kpa and 300 k actual inlet conditions at a rate of 0.5 kgs and
Calculate whether a bar of this steel would fail by fatigue if it were subjected to a steady stress of 600 MPa and a cyclic stress of 500 MPa.
the system is released from rest with no slack in the cable and with the spring stretched 100 mm. determine the
a 0.1 m3 rigid cylinder contains saturated water vapor at 100kpa. a pipe with super heated steam at 1mpa 300 degree c
Air from a workspace enters the air conditioner unit at 30C dry bulb and 20C wet bulb. The air leaves the air conditioner and returns to the space at 20C dry bulb and 6.5C dew point temperature. If there is any, the condensate leaves the air conditio..
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