Posted: June 3rd, 2014

Design and Technology FATIGUE FAILURE ANALYSIS

Design and Technology FATIGUE FAILURE ANALYSIS

Project description
Question

For the given figure and loading condition, compute the factor of safety at points A and B

Given: The material is aluminium with a yield strength of 100 MPa and ultimate strength of 300 MPa. The tube length is 15 cm and the arm length is 20 cm. The tube outside diameter (OD) is 5 cm and inner diameter (ID) is 4 cm. The applied load F, varies from 1000 N to – 600 N.

Assumption: the load is dynamic and the assembly is at a temperature of 300 Celsius. The component should last until 6 x 107 cycles. The notch radius at the wall is 0.75 cm and the stress concentration factors for bending with Kt = 1.7 and for shear Kts = 1.35. Feel free to make any assumptions if you find the information is not sufficient. Justify your assumptions.
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