10-35: A helical coil compression spring is needed for foodservice machinery. The load varies from a minimum of 4 lbf to amaximum of 18 lbf. The spring rate k is to be 9.5 lbf/in. Theoutside diameter of the spring cannot exceed . The springmaker hasavailable suitable dies for drawing 0.080-, 0.0915-, 0.1055-, and0.1205-in-diameter wire. Use squared and ground ends, and anunpeened material. Using a fatigue design factor nf of 1.5, and theGerber-Zimmerli fatigue-failure criterion, design a suitablespring.
Solve Problem 10–35 using the Goodman-Zimmerlifatigue-failure criterion.
