A polycrystalline metal alloy with an average grain size of 12 microns is found to have a yield strength of 120 MPa. The strength of the alloy is doubled when it is work hardened to reduce its average grain size to 1.6 microns. What is the largest average grain size that this alloy can have if it is used in an application where it must have a yield strength of at least 85 MPa

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?

An engine runs on the ideal diesel cycle. the cycle has a compression ratio of 20 and a cutoff ratio of 2. the highest temperature in the cycle is 1200 k. if the heat into the system is 300 kj/kg of working fluid and using variable specific heats determine the work produced per mass of working fluid