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The wear resistance of a steel shaft is to be improved by nitrogen hardening of its surface. The initial nitrogen content of steel is 0.002 wt%, whereas the surface concentration during heat treatment is maintained at 0.50 wt%. A nitrogen content of 0.1 wt % is desired at a position of 0.40-mm below the surface. (a) Determine the diffusion time required at 600oC. The pre-exponential and activation energy for diffusion of nitrogen in steel is given as 3X10-7m2/s and 76.15 kJ/mol, respectively. (b) What time will be required at 500oC to produce the same result (in terms of concentration at a specific depth) as for 10-hours at 600oC?
determine the average applied force exerted on to the pile hammer. Note because the force is applied over a short time period it can be considered as an impulse force.
hot water flows through a pvc k.092 wmk pipe whose inner diameter is 2 cm and outer is 2.5 cm. the temperature of the
Also determine the axial force and deformation of the diameter due to temperature rise. Let E = 120 GPa and Co-efficient of linear thermal expansion = 0.0000168 per °C.
1. What is a parting line or parting surface? 2. What is fluidity? 3. What type of shape modifications or allowances are generally incorporated into a casting pattern?
consider a plate with uniform heat generation q. for k200 wmk q40 mwm3. t1160 c at x0 t2100 c at x2l and a plate
in usa 53 of total electric power is currently generated by coal-fired power plants. typically generation of 1 kwh of
find the natural frequencies of oscillation of the double-pendulum below where m1=m2=m, and L1=L2=L.
carbon dioxide enters an adiabatic compressor at 100kpa and 300k at a rate of 0.5kgs and exits at 600kpa and 450k.
The main elevator A of the CN Tower in Toronto rises about 349 m and for most of its run has a constant speed of 22 km/h. Assume that both the acceleration and deceleration have a constant magnitude of g/3 and determine the time duration t of 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..
estimate the density of an aluminum-magnesium alloy used for soda cans as a weighted average of the densities of
a vertical cylinder fitted with a piston contains 10 lbm of freon-12 at 60 degrees fahrenheit. heat is now transferred
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