SPRing calculations of F and TAU (sprftau) of a circular cross-section spring,
tau = max shear stress produced,
R = radius of coil measured from spring axis to ctr of section,
d = diameter of circular section,
P = load (tensile or compressive),
f = total stretch or shortening of spring,
n = number of active turns in spring,
a = (alpha) pitch angle of spring,
G = the modulus of rigidity of the material (shear modulus),
v = poisson's ratio of the material.
1) If the function is called with no input arguments, then a graphical
representation of the equations is produced for publication purposes.
2) If the function is called with only the first 3 input args (R,d,P),
then only the value of tau is returned. f is set to -1.
3) If the function is called with all 7 input args, then both tau and f
Roark's Formulas for Stress and Strain, 7th Edition, page 398
Warren C. Young, Richard G. Budynas
(c)2002, 1989 by the McGraw-Hill Companies, Inc.
Mechancial Springs, 2nd Edition
A. M. Wahl
(c)1963, 1944 by the McGraw-Hill Book Company, Inc.
Congress Catalog Card Number 62-20725
Rob Slazas (2023). SPRing calculations of F and TAU (https://www.mathworks.com/matlabcentral/fileexchange/19595-spring-calculations-of-f-and-tau), MATLAB Central File Exchange. Retrieved .
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