Question

If this component has a nominal aternating tress ,#7Asi and a mid range stress a 8 ksi with a endurance limit S15.0ki, find the safety factor against infinite ife using the Goodman criteria Problem 8 fatigue stress concentration factor A 3that affects both stress components and a fully corrected 09 0) 3.1 A) 1.3 B)1.1 924 Part 3 Mechanical Springs A helical compression spring is made from music wire that is 0.041 inches in diameter and has a mean coil diameter of 0.50 inches with a free length of 2.0 inches and 10 total coils with plain ends. Problem 9 What is the solid length L,? A) 0.32 inch 8) 0.25 inch C) 0.41 inch D) 0.45 inch E) 0.53 inch Problem 10 What is the spring rate k? A) 5.50 lbf/in B) 3.25 lbf/in C) 2.95 lbf/in D) 4.44 lbf/in E) 1.95 lbf/in

This is the clearest I can provide, please solve it don't ask for clearer picture

Answer 1

given dia o.041 inches. wive o.5 inches Coil dia = 2.0 inches No. af. coils to folid Jongth -ald af. Coils x dia meter f coire no. o.HI inch. pio 10 F 8 DN shear medulus G= PSi

Cd MX10 XCo. OHI) 8X C0s) 0 3.25 b 1n. SU