Cantilever Design:Goal : Reduce max displacement to half without increasing weight.Implies : Volume should not changeImplies : C/S area should remain constantSo Ar=24As MI is proportional to cube of height we will iterate on heightht=8!!inch iteratebr=24/ht!!inchMI1=br*ht**3/12All other steps are same as Cantilever

fini/clear/prep7/TITLE,cantilever beamN,1,0,0,0N,2,50,0,0N,3,100,0,0c*** define element typeet,1,beam3c*** define material prop.mp,ex,1,30e6!!!psimp,nuxy,1,0.3c*** create parametersar=24ht=8!!inchbr=24/ht!!inchMI1=br*ht**3/12c*** create real constantsR,1,ar,MI1,htc***REAL,1mat,1type,1c*** define elementse,1,2e,2,3c***constraintsd,1,all,0c*** forcef,3,fy,-100

Save this file in your working dir by name cantilever_design

Use file/read input from/double click on cantilever_design.

You will get the display indicating displacement

Re run the analysis by increasing ht.Follow same procedure till you get half deformation.Learn how to use read input fromAnd use of programme.You can use the same programme to find cantilever of any cross section/length/load.