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Problem 2-4

# Problem 2-4 - MACHINE DESIGN An 2-4-1 PROBLEM 2-4 Which of...

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MACHINE DESIGN - An 2-4-1 PROBLEM 2-4 Statement: Which of the aluminum alloys shown in Figure 2-21 would you choose to obtain (a) Maximum strength (b) Maximum modulus of resilience (c) Maximum modulus of toughness (d) Maximum stiffness Units: ksi 10 3 psi . MPa 10 6 Pa . GPa 10 9 Pa . MN 10 6 newton . Given: Young's modulus for aluminum E 71.7 GPa . Solution: See Figure 2-21 and Mathcad file P0204. 1. Determine, from the graph, values for yield strength, ultimate strength and strain at fracture for each material. Alum Yield Strength Ultimate Strength Fracture Strain 1100: Sy 1100 120 MPa . Sut 1100 130 MPa . ε f 1100 0.170 2024-T351: Sy 2024 330 MPa . Sut 2024 480 MPa . f 2024 0.195 7075-T6: Sy 7075 510 MPa . Sut 7075 560 MPa . f 7075 0.165 Note: The 0.2% offset method was used to define a yield strength for all of the aluminums. 2. From the values of S ut above it is clear that the 7075-T6 has maximum strength . 3. Using equation (2-7) and the data above, determine the modulus of resilience.
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