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3501as2-f09

# 3501as2-f09 - be subjected to 50 cycles at 260 MPa 100...

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CGN 3501 Homework Assignment No. 2 (Due 10/30/09) Fall 2009 1. The stress-strain diagram of a structural material is given below. Find the following: (A) Elastic modulus. (B) Johnson’s Apparent Elastic Limit. (C) Yield Strength at 0.2% offset. (D) Modulus of Resilience. (E) Modulus of Toughness. (40 pts.) 0 2 4 6 8 10 12 14 16 18 20 STRAIN (10 -3 ) 50 40 30 20 10 0 STRESS (KSI) 2. The S-N diagram of a structural material is shown below. (A) A structural member made of this material is to be subjected to 100,000 cycles of cyclic stress of 140 MPa during its design life. What is the maximum magnitude of an additional steady stress that can be put on top of the cyclic load without fracture during its design life? Use (a) Soderberg's theory, and (b) Goodman’s theory for this problem. (20 pts.) (B) A structural member made of this material is to

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Unformatted text preview: be subjected to 50 cycles at 260 MPa, 100 cycles at 240 MPa and 500 cycles at 220 MPa per day. Determine the number of days of service before it will fracture according to Minor’s Rule. (20 pts.) σ yield = 320 MPa σ ultimate = 360 MPa 3. A steel bar is connected to an aluminum bar as shown below. The cross-sectional area of the steel is the same as that of the aluminum. At 15 ° C, the stresses in the steel and the aluminum bars are zero. Calculate the stresses in the steel and in the aluminum when the temperature rises to 60 ° C. The properties of the steel and the aluminum are given below. (20 pts.) Steel E s = 30.0 X 10 6 psi α s = 11.7 X 10-6 / ° C Aluminum E al = 10.0 X 10 6 psi α al = 22.3 X 10-6 / ° C 6" 8" Steel Aluminum...
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3501as2-f09 - be subjected to 50 cycles at 260 MPa 100...

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