# Engineering 151 Test Module 7 through 9

1)

2)

A large flat plate is subjected to constant amplitude uniaxial cyclic tensile and compressive stresses. Compute the critical crack length if the fatigue life must be at least 3x10^{6} cycles. Assume the initial maximum edge surface crack length to be 1.1 mm, and a maximum tensile stress of 160 MPa. Assume m=3.0, A=1.4x10^{-13}MPa in meter units, and Y=1.2.

3)

Using the attached figure, for a Cu-20% Wt Ag alloy, determine the phases present, their percentage amounts, and their compositions at

a. 1000 degrees Centigrade

b. 781 degrees Centigrade

c. 779 degrees Centigrade

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