- Question 3 20 Marks A Helical Coil Compressive Spring Is To Be Designed For 104 Cycles Fatigue Life The Spring Is Sub 1 (143.61 KiB) Viewed 24 times
Question 3 (20 Marks) A helical coil compressive spring is to be designed for 104 cycles fatigue life. The spring is subjected to a load that fluctuates between 100 and 300 lbf. Steel spring wire having Sus (ultimate strength for shear stress) of 160 ksi, and a zero-maximum torsional 104 cycles fatigue strength of 140 ksi is to be used. Presetting is applied. The material's shear modulus G=11.5x103 ksi. (a). For a value spring index C= 8, determine the wire diameter and coil diameter. (b). The number of the active turns is 10, the ends of the spring are fixed-fixed and they have the geometry as shown below. What is the spring constant K, and what is the spring-solid length, Ls, obtained in (a)? Figure Q3