For this test, assume aluminum alloy data: density=2.7 g/cc, elastic modulus= 72

Question

For this test, assume aluminum alloy data: density=2.7 g/cc, elastic modulus= 72 GPa, possions ratio=0.33, yield strength= 220 MPa, tensile strength= 280 MPa, fracture elongation= 17 %, work hardening exponent= 0.15, fracture toughness = 65 MPa?m, 10^(7) cycle fatigue strength= 45 MPa, thermal expansion coefficient = 23x10^(-6)/K

1) What is the engineering strain at the ultimate tensile strength?

2) Rotating beam fatigue test is applied to this alloy. Give the R value and plot the expected S-N cure from 0.25 to 10^(7) loading cycles.

3)A device made from this aluminum alloy is subjected to balanced biaxial tensile loading (both x and y have the same stress). At what stress will the structure exhibit plastic deformation as defined by the yield strength?

4)With the following 3D stress matrix will the aluminum alloy be safe?

100 15 0

15 50 0

0 0 0

If you can't answer them all feel free to leave what you know.

Any help would be appreciated!

Explanation / Answer

1) engineering strain at UTS = exp(n)-1, where n is the work hardening exponent.

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