Problem 4. [10 Marks] (a) A solid shaft of diameter D=50 mm rotates and carries the minor shock loading as shown in figure. Calculate the fatigue safety factor n and yielding factor of safety ny for the shaft. Given: D=75 mm, Sy=550 MPa, Su=660 MPa. The torque fluctuates 5% each way from the mean value, and the shaft is to be machined from unnotched steel. [5 Marks] (b) Determine the value of the critical speed of rotation for the simply supported shaft carrying two loads at C and D as illustrated in figure. D=50mm, E=210GPa and density p = 7800 kg/m³. [5 Marks] -0.3 m 1 kN 0.5 m 5 kN 0.5 m 0.15 m 1 m 120 mm 0.5 m 120 mm 2 kN 6kN 2 kN 6 KN
Problem 4. [10 Marks] (a) A solid shaft of diameter D=50 mm rotates and carries the minor shock loading as shown in figure. Calculate the fatigue safety factor n and yielding factor of safety ny for the shaft. Given: D=75 mm, Sy=550 MPa, Su=660 MPa. The torque fluctuates 5% each way from the mean value, and the shaft is to be machined from unnotched steel. [5 Marks] (b) Determine the value of the critical speed of rotation for the simply supported shaft carrying two loads at C and D as illustrated in figure. D=50mm, E=210GPa and density p = 7800 kg/m³. [5 Marks] -0.3 m 1 kN 0.5 m 5 kN 0.5 m 0.15 m 1 m 120 mm 0.5 m 120 mm 2 kN 6kN 2 kN 6 KN
Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment
Section: Chapter Questions
Problem 1CE
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![Problem 4. [10 Marks]
(a) A solid shaft of diameter D=50 mm
rotates and carries the minor shock
loading as shown in figure. Calculate
the fatigue safety factor n and
yielding factor of safety ny for the
shaft. Given: D=75 mm, Sy=550 MPa,
Su=660 MPa. The torque fluctuates
5% each way from the mean value,
and the shaft is to be machined from
unnotched steel. [5 Marks]
(b) Determine the value of the critical speed
of rotation for the simply supported
shaft carrying two loads at C and D as
illustrated in figure. D=50mm,
E=210GPa and density p = 7800 kg/m³.
[5 Marks]
-0.3 m
1 kN
0.5 m
5 kN
0.5 m
0.15 m
1 m
120 mm
0.5 m
120 mm
2 kN
6kN
2 kN
6 KN](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe0723359-7450-4add-b4b9-bd7a571fb8f9%2F61b06a51-b161-4f1a-90ab-6f58ca2b3b7e%2F0ca3o9p_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Problem 4. [10 Marks]
(a) A solid shaft of diameter D=50 mm
rotates and carries the minor shock
loading as shown in figure. Calculate
the fatigue safety factor n and
yielding factor of safety ny for the
shaft. Given: D=75 mm, Sy=550 MPa,
Su=660 MPa. The torque fluctuates
5% each way from the mean value,
and the shaft is to be machined from
unnotched steel. [5 Marks]
(b) Determine the value of the critical speed
of rotation for the simply supported
shaft carrying two loads at C and D as
illustrated in figure. D=50mm,
E=210GPa and density p = 7800 kg/m³.
[5 Marks]
-0.3 m
1 kN
0.5 m
5 kN
0.5 m
0.15 m
1 m
120 mm
0.5 m
120 mm
2 kN
6kN
2 kN
6 KN
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