Design Questions Set 34:
Find the bending stress in the top weld if the thickness of the weld is t. Given: P = 15 kN and e = 120 mm.
Solution:
A rectangular plate measuring b=50 mm, t=10 mm has a hole of 10 mm diameter. It is subjected to an axial load of 10 kN. The nominal stress is:
Solution:
For which type of materials does the graph plotted between fatigue strength and number of stress cycles become horizontal in an S-N diagram?
Solution:
A horizontal shaft in the whirling condition has a static deflection of 0.0003 m at the location of the concentrated mass. Calculate the critical speed of the shaft. (Take g = 10 m/s²)
Solution:
In which of the following cases is the stress concentration factor ignored?
Solution:
A shaft has an ultimate tensile strength of 200 N/mm2 and a yield strength of 100 N/mm2. According to the ASME code, calculate the allowable shear stress for the shaft (without keyway effect).
Solution:
Find the total load on the stud if the coefficient of the main load of threaded joints is 0.20, the maximum gas force is 6146.86N, and the preloading force of the stud/bolt is 24588.88N.
Solution:
Consider a gear and pinion that have a contact ratio of 2. Which of the following is true for that?
Solution:
A mild steel rod of 12 mm diameter was tested for tensile strength with a gauge length of 60 mm. Following observations were recorded:
Final length = 80 mm; Final diameter = 7 mm; Yield load = 3.4 kN and Ultimate load = 6.1 kN.
Calculate the percentage elongation.
Solution:
A machine component is subjected to variable loading such that the amplitude stress is 90 MPa, the mean stress is 150 MPa, the endurance limit stress is 270 MPa, the ultimate strength is 600 MPa, and the yield strength is 450 MPa. Find the factor of safety using the Soderberg method.
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