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clc;
clear;
mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-7.3 Page No.141\n');
W=3000; //[lb] Weight of automobile
L=40*12; //[in] Length of the beam
I=64.2; //[in^4] Moment of inertia of the beam
Sy=48000; //[lb/in^2] Yield strength of the beam
c=8/2; //[in] Distance from the outermost fiber to neutral axis
E=30*10^6; //[lb/in^2] Modulus of elasticity
g=32.2; //[ft/s^2] Acceleration due to gravity
M=I*Sy/c; //[lb*in] Moment at which beam will yield
F=4*M/L; //[lb] Force at which beam will yield
Delta=F*L^3/(48*E*I); //[in] Deflection
KE=F*Delta/2; //[lb*in] Kinetic energy
V=sqrt(2*g*KE/W); //[in/s] Velocity
V=V/5280*3600; //[miles/hr] Velocity
mprintf('\n At %f miles/hr velocity the beam will yield.',V);
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