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//===========================================================================
//chapter 4 example 3
clc;
clear all;
//variable decalartion
Smax = 3.0*10^6; //maximum stress in kg/m**2
E = 1.2*10^10; //young's modulus in kg/m**2
w = 0.0006; //width of spring in m
Td = 1.2*10^-4; //deflecting torque in kg-m
d = 90; //deflection in degrees
//calucaltions
theta = %pi/(2); //deflection in radians
//since T = ((E*W*(t*3))/(12*L))*theta
//t^3/l = (12*Tc)/(E*W*theta)
Tc = Td/(2); //controlling torque of each spring in kg-m
//x = t**3/l
x = (12*Tc)/((E*w*theta)); //equqation 1
//y =l/t
y = (E*theta)/(2*Smax); //equation 2
//by multiplying equations 1 and 2 (x*y =t**2 =z)
z = x*y;
t = sqrt(z); //thickness of spring strip in mm
l = y*t; //length on m
//result
mprintf("thickness of spring strip = %3.2f mm",(t*10^3));
mprintf("\nlength in = %3.2f m",l);
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