Name CHEN 3080/5080 Materials Science and Engineering: Spring 2018 Home Work 13

Question

Name CHEN 3080/5080 Materials Science and Engineering: Spring 2018 Home Work 13 due Thu, Mar 29 Read 7.1. 7.2,7.4,7.5 Review Problems 7.1,7.3, 7.4,7.5 Briefly explain how the fatigue test is carried out. Briefly explain how the creep test is carried out. Plot the fracture stress (MPa) for aluminum alloy 7075-T651 versus surface crack size a (mm) values from 0.2 mm to 2.0 mm A 1047 steel is fatigue tested using a maximum stress of 60 ksi and a minimum stress of 50.00 ksi. y-axis is changed to: maximum stress of 40 ksi and minimum stress of 30 1. 2. 3. 4. Estimate the Number of cycles to failure (use Fig 7.18, assuming the Stress on refers to the mean stress). What is the answer to this question if the stress range ksi. iaxed MAR-M 247 alloy (Figure 7.31) is used to support a stress of 25 ksi (172 MPa). Determine the time to stress rupture at 900°C 5. Equi

Explanation / Answer

a. Fatigue test is done as loading pre determined test stress and unloaded to zero, cycle of loading and unloading repeated until end of test.

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