(a1)5.2 mm diameter cylindrical aluminum alloy rod is subjected to tension-compression cycling along its axis. Compute the maximum and minimum LOADS that correspond to a stress amplitude of 140 MPa and a mean stress of 35 MPa. (b) List and explain four measures that may be taken to increase the fatigue resistance of a given metallic component. The bulk of the specimen, the loading conditions and the temperature CANNOT BE CHANGED, only the specimen surface can. (25)

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

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