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The main shaft in an industrial bread dough mixer is subjected to an alternating bending stress due to the pulley drive system sigma a and an additional mean bending stress when mixing dough sigma m. The shaft is made from a commercially polished steel Phi 1.5" Times 72", with E = 30 msi, Sy = 80 ksi, Su = 100 ksi Construct the S-N curve for the shaft Construct the 106 and 103 constant-life curves (Goodman Diagram) If on average the ratio of mean stress to alternating stress is 1, sigma a/ sigma m = 1, what is the maxi mu m stress allowable to achieve 106 life? (Estimate from your graph) What surface treatment(s) would you recommend to improve shaft fatigue life?
The diffusivity of copper in a commercial brass alloy is 10^-20 m2/s at 500'C. The activation energy for diffusion of copper in this system is 195 kJ/mol. Calculate the diffusivity at 600'C.
a straight duct with a radius of 40 cm contains a fan that is operating at steady state. the fan draws air from the
The rigid gate, is hinged at O and rests against a rigid support at B. What minimum horizontal force, P, is required to hold the gate closed if its width is 3.9 m? Neglect the weight of the gate and friction in the hinge. The back of the gate is e..
a projectile mass m travels along the posotive x coordinate direction at a speed of 300 ms breaks into three parts m1
consider the surface of a solid that is at an elevated temperature and exposed to cooler surroundings. by what modes is
Describe when each type of failure occurs: direct tension, direct compression, column buckling, direct shear, torsional shear stress, bending stress
conventional ceramics have a fracture toughness of about 5 while advanced ceramics may have 20. determine1 how larger
Ten grams of computer chips with a specific heat of 0.3 kJ/kg dot K are initially at 15 degrees C. These chips are cooled by placement in 5 grams of saturated liquid R134a at -38 degrees C.
a reversible power cycle receives enery qh from a hot reservoir at th and rejects enerfy qc by heat transfer to a cold
steam at 3mpa and 700 degrees c is available at one location in an industrial plant. at another location steam at 2mpa
saturated liquid water is compressed from 100 kpa state 1 to 2.5 mpa state 2 in an adiabatic pump having 85 isentropic
a bubble of air is suspended in clean water at ambient pressure and temperature.a how do the pressure and the number of
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