Design Questions Set 8:
What is the constant factor in the R10 series of preferred numbers?
Solution:
If the notch sensitivity factor is 0.8 and the theoretical stress concentration factor is 2.5, calculate the stress concentration factor.
Solution:
What is the other name of St. Venant's theory?
Solution:
The mean stress for a member subjected to repeated stress is 500 N/mm2. What is the value of the alternating stress for the member?
Solution:
If the mean stress value for a sinusoidal stress function is zero, then this type of stress falls under which of the following categories?
Solution:
A machine component is subjected to 2-D stresses. The tensile stress in the X-direction varies from 40 to 60 MPa, while the tensile stress in the Y-direction varies from 20 to 40 MPa. The mean stress (in MPa) is:
Solution:
A shaft is subjected to torsional loading with a maximum stress of 75 MPa. The shaft material has a yield strength in tension (Syt) of 160 MPa and a yield strength in compression (Syc) of 170 MPa. Calculate the factor of safety for the shaft.
Solution:
If the moment of normal force is 550,000 N-mm and the moment of frictional force is 200,000 N-mm about the pivot axis, find the value of the actuating force. The force acts at a distance of 180 mm from the pivot point.
Solution:
A mild steel rod of 12 mm diameter was tested for tensile strength with a gauge length of 60 mm. The following observations were recorded:
Final length = 80 mm; Final diameter = 7 mm; Yield load = 3.4 kN; Ultimate load = 6.1 kN.
Calculate the yield stress.
Solution:
What should be the primary consideration in shaft design?
Solution:
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