Homework # 3.pdf

Homework # 3.pdf - EML 3005 Mechanical Design Nagaraj K...

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EML 3005: Mechanical Design Nagaraj K. Arakere, MAE Dept, UF EML 3005: Mechanical Design Mechanical & Aerospace Engineering Department University of Florida Homework #4: 3 October, 2017 Due 10 October (Tue, Submit hardcopy in class) Problem 1 The σ max -N data for a fatigue test with mean stress σ m = 25 ksi tension are shown below. σ max (ksi) N (cycles) 150 2 x 10 4 131 5 x 10 4 121 1 x 10 5 107 2 x 10 5 105 5 x 10 5 103 1 x 10 6 102 2 x 10 6 Relevant material properties are S ut = 240 ksi and S y = 225 ksi. a. Determine and plot the S -N curve for a mean stress σ m = 0 tension for this material. b. Determine and plot the S -N curve for a mean stress σ m = 50 tension for this material. Problem 2 Consider a shaft with a groove (see Fig. A-15-14 below) subjected to a fully reversed torsional fatigue. The material is AISI 1018 CD machined steel. Shaft dimensions are d =20 mm, D =25 mm, and r =2.5 mm. Material properties (from Table A-20: check, good practice for test) are

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• Spring '09
• NagarajArakere
• mechanics, Fatigue limit, Nagaraj K. Arakere

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