Consider a single crystal of a cubic metal that is subjected to a tensile stress along the [0 1 2 ] direction.
Calculate the Schmidt factor for the following slip systems. In each case sketch the tensile axis as well as the slip plane and slip direction.
a) (0 -1 1) [0 1 1]
b) (1 0 1) [-1 -1 1]
c) (0 1 0) [ -1 0 1 ]
d) If the crystal above is subjected to an increasing applied stress, which of the systems above will undergo slip first. Explain your answer.
e) What is the value of the ratio t CRSS / (sigma)y at the point of slipping?
In: Mechanical Engineering
1.What is working progress for Design for cost? 2.What is working progress for Design to cost?
In: Mechanical Engineering
1. What is Work process of Design for cost(DFC)? 2.What is checklist for DFC? 3. How can we do Design for cost analysez? 4. What is work process of Design to cost(DTC)? 5.What is Checklist for DTC( If it has)?
In: Mechanical Engineering
Water at 20°C flows up a vertical pipe of circular section and internal diameter of 2 inches and height of 12 metres at a volumetric flow rate of 6.7 litres per second. Estimate the change in pressure between the bottom and the top of the pipe if:
i. The inner walls of the pipe are assumed to be hydraulically smooth,
ii. The pipe is fabricated from cast iron and explain how you solved (ii) above.
In: Mechanical Engineering
What is the aluminum profile? What is the
manufacturing method of aluminum profile? What are the materials
used in the manufacture of the product, describe in detail. What
are the stages of the production method?
What are the faults that can be caused by the production in the
product? Are there any alternative production method? What are
those, compare them.
What are the standards to follow in the production method?
In: Mechanical Engineering
A plane wall has thickness of 5 cm, thermal conductivity of 2 W/mK and generates heat. The left face of the wall (x=0) has a surface temp. of 80C and has air at 20C flowing past it with a heat transfer coefficient of 50 W/m^2K. If the right face is insulated then the temperature distribution through the wall has a general format T(x)=A+B*x+C*x^2
(a) Draw a properly labeled diagram (including a representative temperature distribution), state all assumptions and calculate the volumetric energy generation in the wall.
(b) Apply appropriate boundary conditions to determine the coefficients A, B, and C for the temperature distribution through the wall.
(c) Where will the maximum temperature be located in the wall?
In: Mechanical Engineering
What is the mean effective pressure?
What is the kinematic energy correlation factor?
What iscentropic?
What is intercooling?
In: Mechanical Engineering
Determine the displacement of a plate of length L pinned at its ends with a concentrated load Va applied at the center.
In: Mechanical Engineering
1. What is the USA principle?
2. Why is the USA principle important?
3. Why is the automation migration strategy not suitable for products with short lives?
In: Mechanical Engineering
A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.08 and 0.10 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmospheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 80 and 30°C, respectively, what is the rate of convective heat loss per meter of tube length across the air space?
In: Mechanical Engineering
1. If the oxygen diffusion coefficient in tissue is assumed to be 1.1x10-5 cm2/s and fluid velocity is 1 mm/s, how large a distance between capillaries is required for convection to play an equally significant role as diffusion? Assuming an average distance between capillaries of 100 mm, does convection play a significant role? Use Peclet number to justify answers.
In: Mechanical Engineering
Using the appropriate tables, determine the change in specific
entropy between the specified states, in Btu/lb · °R.
(a) water, p1 = 10 lbf/in.2,
saturated vapor; p2 = 500 lbf/in.2,
T2 = 700°F.
(b) ammonia, p1 = 140 lbf/in.2,
T1 = 160°F; T2 = -10°F,
h2 = 100 Btu/lb.
(c) air as an ideal gas, T1 = 80°F,
p1 = 1 atm; T2 = 340°F,
p = 5 atm.
(d) oxygen as an ideal gas, T1 =
T2 = 520°R, p1 = 10 atm,
p2 = 9 atm.
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Based on the boiling curve why is boiling to 100% quality avoided in risers?
The number of natural gas fossil fuel power plants have now exceeded coal plants. Many of the coal plants are being converted to natural gas. Explain 4 items that would change at the plant as a result of this conversion.
In: Mechanical Engineering
a. How do dislocation junctions contribute to strengthening? b. The addition of C to Fe greatly increases the room temperature strength of the alloy, but an equal amount of C added to Ag has little effect. Why?
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Using psychrometric chat to answer the questions below:
15 m3/min humid air is to be cooled using an air conditioning unit. The inlet air is at 35 °C and 60% relative humidity and should be cooled to 18 °C, at which point it will be saturated.
a) Below which temperature will condensation start occurring?
b) How much water will have condensed if cooled to 18 C (mw,out)?
c) Determine the heat removal, Qout, using the first law of thermodynamics.
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