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A screw thread is cold rolled on a 1015 low-carbon steel bolt of 6.25 mm diameter. Observation shows that the length of the contact zone between die and screw blank is L= 1.25 mm. The average strain hardening during rolling corresponds to a strain ofe= 0.4.
Calculate:
(a) the applicable flow stress, and
(b) the average interface pressure in the contact zone.
Determine:
(c) if there is any danger of internal fracture (make a sketch to illustrate the point).
a simple turbojet is operating with a compressor pressure ratio of 8.0 a turbine inlet temperature of 1200 k and a mass
The rod moves in a vertical plane through O. Show that there are two equilibrium positions for the rod, and determine their stability.
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.
draw the shear and bending-moment diagrams for the beam and loading shown and determine the maximum normal stress due to bending.
A turbine is connected to an electric generator through gears, as shown in Fig. 5.59
If a gearbox replacement was required every 5 years at a cost of $600,000, what would the COE be? How much (in percent) does the COE increase due to the gearbox replacement?
a sphere 1 ft in diameter is moving horizontally at a depth of 12ft below water surface where the water temperature is
Determine the heat transfer coefficients for the two cases, assuming the plate behaves as a spacewise isothermal object.
Assume that all cash flows take place at year-end. Consider the present to be the end of 2010/beginning of 2011. Assume that there is no salvage value at the end of year 2055.
1. Develop and draw the MDOF system for the vertical vibrations of the un-damped three dimensional model of a typical three-wheeled solar or energy efficient car (include wheels, car body, driver, minimum 7 DOF).
Assume the sphere is initially at 95?C and the environment temperature remains constant at 35?C. What is the time constant of this system?
an air-conditioned room requires 30 m3 min of air at 1.013 bar 20 degree c 52.5 rh. the steady flow conditioner takes
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