For the member in Problem 16.14, determine Pmax if the member fails in 108 cycles of load...

For the member in Problem 16.14, determine Pmax if the member fails in 108 cycles of load from Pmin = −100 kN to Pmax.

A rectangular cross section tension member made of a ductile material (Y = 350 MPa and σam = σL = 280 MPa at 108 cycles of completely reversed axial load) has semicircular grooves (Figure P16.14). The thickness of the member is 40 mm.

a. Determine the failure load for static loading.

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b. Determine the failure load for 108 cycles of completely reversed axial load.

FIGURE P16.14