Find the number of cycles required for a crack to grow from 1 mm to 1 cm in 7075-T6 (problem 8) if f = 1 and σ = 10 MPa. Remember that K = f σ√(πa).

Problem 8

Figure 17.34 shows the crack growth rate in aluminum alloy 7075-T6 as a function of ∆K for R = 0. Find the values of the constants C and m in that describe the straight-line portion of the data. Give units.


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