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//
//A cantilever of 3 m span, carrying uniformly distributed load of 3 kN/m is to be designed using cast iron rectangular section. Permissible stresses in cast iron are f = 30 N/mm^2 in tension and fc = 90 N/mm^2 in compression
L=(3) //Span of cantilever,m
w=(3) //uniformly distributed load,KN/m
M=w*1000000*(L**2)/2 //Maximum moment**N-mm
//let b be the width and d the depth
//Z=b*(d**2)/6
//Since it is rectangular section, N-A lies at mid-depth, and stresses at top and bottom are same. Hence, permissible tensile stress value is reached earlier and it governs the design.
fper=30 //N/mm^2
b=100 //mm
f=30
//f*Z=M
d=sqrt((M*6)/(b*f))
printf("\n d= %0.1f mm",d)
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