8.1) Use the following experimental data (loglog scale) from a zero mean value stress situation Oa, MPа 3x10 948 834 703

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8.1) Use the following experimental data (loglog scale) from a zero mean value stress situation Oa, MPа 3x10 948 834 703 631 579 524 Nf, cycles 222 992 6004 14 130 43 860 132 150 Number of cycles to failure in order to give the behavior of the stress amplitude with respect the number of cycles up to failure. SOL: a = 1565.08 N-0.0928 8.2) Use the previous data to estimate the number of cycles up to fracture if the stress amplitude is 450 MPa and the mean stress is 200 MPa (remember that, in order to take into account the nonzero mean stress you must use the generalized form of the curve: In [22]: ex_82) - Om Cycles estimation = 172040.0122972191 cycles a = (o's – 0m)(2N;)