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Internal Code: MAS1817
Mechanical Engineering Assignment:
Task:
Question 1:
1-A
Figure Q1-A shows a welded steel bracket loaded by a static force, F, of 8 kN. Estimate the factor of safety if the allowable shear stress in the weld throat is 105MPa.
1-B
Figure Q 1-B illustrates a typical lap joint design using adhesive bonding. What is the major problem that is inherited in such design? Propose and show graphically FOUR (4) designs which are able to reduce the problem stated above.
Question 2
2-A
Figure Q2-A shows two gears A and C attached to a shaft supported by bearing and B and D. Forces acted on gear A and C are 180 N and 200 N respectively. Draw load, shear force, bending moment and shaft torsional moment diagrams for the shaft, in both XY and XZ planes, and then locate the most endangered x-section of the shaft. You need to determine the shaft and size fittings and then the drawing of the shaft.
2B
The figure shown (figure Q 2-B) is geared countershaft with an overhanging point at C. Select an angular contact ball bearing for mounting at O and a straight roller bearing for mounting a B. the force on gear A is FA = 2670N, and the shaft is to run at a speed of 450 rpm. Specify the bearing required, using an application factor of 1.4, a desired life of 50 000 h, and a combined reliability goal of 0.9.
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