Stresses in Springs Now define Spring Index as C= d Gives measure of coil curvature ·Then 8FD πd3 2C+1 Ks= Shear stress augmentation factor 2cStresses in Springs • Now define Spring Index as d D C = • Gives measure of coil curvature • Then max s 3 8 K FD d τ π = augmentati stressShear factoron 2 12 K s = + = C C