A cast-iron push rod (E = 117 GPa and v = 0.20) in a valve assembly is operated by a steel...

A cast-iron push rod (E = 117 GPa and v = 0.20) in a valve assembly is operated by a steel cam (E = 200 GPa and v = 0.29) (Figure P17.8). The cam is cylindrical in shape and has a radius of curvature of 5.0 mm at its tip. The surface of the push rod that contacts the cam is spherical in shape with a radius of curvature 4.0 m so that the rod and cam are in point contact. If the allowable maximum principal stress for cast iron is −1400 MPa, determine the maximum load P that may act on the rod.

FIGURE P17.8 Contact load in valve tappet.