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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.
The wet bulb and dry bulb temperatures for humid atmospheric air (at 100 kPa) are measured to be 20 C and 25C respectively. Determine: a. using the psychrometric chart, the relative humidity b. using the psychrometric chart, the humidity ratio
The pipe shown is subjected to a force of magnitude F = 800N. Determine the angle θ between F and the pipe segment BA, and the magnitudes of the components of F which are parallel and perpendicular to BA.
Determine the required pumping rate. the aquifer has T= 1600 m2/day and the wells each have radius of influence of 600m.
Plot a curve showing the relationship of Se versus L/r for steel columns. Draw the curve for slenderness ratios that vary from 0 to 200. Assume the proportional limit = 235 MPa
Discuss the effects of the project on the local community of the project described below 1.) The social, economic and environmental significance of the project within the local community 2.) The good, and bad impacts the project might have.
On the two lane carriageways, roadworks restrict the width of both traffic lanes, generating a bottleneck to the traffic flow. The maximum flow per lane on the unobstructed carriageway is 2100 vehicles per hour whilst on the section under repairing t..
A saturated clay deposit is vane-tested in-situ. A torque of 30Nm is required to shear the clat. The vane is 40mm wide by 100mm long.What is the undrained shear strength of the clat in kPa?
Describe the use of productivity models for estimating land productivity. Provide details about various attributes that can be used and how the model is developed . Examples can be used to demonstrate model workability.
The x-component of a velocity field is ax+b.If the flow is steady, two-dimentional and incompressible; generate an expression for velocity component in the y-direction as a function of x and y.
A block of 250mm length and 50x40mm cross section is tosupport a centric compressive load P. The material to be usedis a bronze for which E = 95GPa. knowing that the normal stress must notexceed 80 MPa and that the decrease in length of the block sho..
Four pumps are to be used in 0.5-m diameter wells at the four corners of the site. Determine the required pumping rate. The aquifer has T = 1600 m^2/day and the wells each have a radius of influence of 600 m.
Oil of a specific gravity of 0.75 is flowing through a 6-in pipe under a pressure of 15 psi. If the total energy relative to the datumplate is 8.0 ft below the center of the pipe is 58.6 ft, determine the flow rate of the oil.
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