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Consider two parallel edge dislocations of the same sign. Let θ be the angle between the line connecting the two dislocations and the direction of their Burgers vectors.
(a) Calculate the variation of the glide force and the climb force for the two dislocations as a function of the relative positions of the dislocations (i.e. as a function of θ).
(b) Which of the following configurations is more stable and why? Configuration A: The two dislocations align themselves one below the other along a direction normal to their slip planes. Configuration B: The two dislocations align themselves one beside the other along a direction normal to their slip planes.
(c) Give examples of at least two practical situations where the more stable configuration in part (b) is observed.
(d) Repeat part (a) for the situation where the two parallel edge dislocations are of opposite sign.
At compressor exit, the specific entropy is the same as that at the inlet, and the pressure is 60 psia. Determine the R-134a exit temperature and the change in the enthalpy of R134a.
Compare the maximum shear stress and the angle of torsion for members of equal lengths and cross-sectional areas with square, rectangular and circular section. All members are subjected to the same torque
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Liquid water is to be pumped by a 10-kW pump from 100 kPa at a rate 5 kg/s. What is the highest pressure the water can reach at the exit? Neglect the kinetic and potential energy change of the water. Take the specific volume of water as constant at 0..
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A tied short column of square cross-section is subjected to a factored axial load of 2500 kN and a factored bending moment of 175 kN.m. Use a 40 mm clear cover to the ties and a 20 mm maximum aggregate size.
A spherical gas container made of steel has a 5-m outer diameter and a wall thickness of 6 mm. Knowing the internal pressure is 350 kPa, determine te maximum normal stress and the maximum shearing stress in the container.
A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3.
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