For Problem 17.11 use a safety factor SF = 1.75.
a. Recalculate the required load.
b. For this load, determine the displacement (approach) ö of ihe ball relative to the plate.
A hard steel ball (E = 200 GPa and v = 0.29) of diameter 50 mm is pressed against a thick aluminum plate (E = 72.0 GPa, v = 0.33, and Y = 450 MPa). Determine the magnitude of load PY required to initiate yield in the aluminum plate according to the octahedral shear-stress criterion of failure.
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