Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - frame boxing vs triangulating
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Old 04-30-2007, 10:26 AM
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the object of boxing is to increase the moment of inertia.. which is a geometric, calculatad constant for the beam section you are working on.. it determins the torsional rigidity allong with the modulus of elasticity of the material of the beam.. and it increases with the distance from the center of the beam to the material... so in laymans terms, the bigger the diameter of the tube, the more tortionally rigid it will be... if you were to weld the boxing plate from corner to corner instead of closing the c-chanell you would decrease the "diameter" of the tube and it would be less rigid.. it would be a smaller tube , with a "wing of material" not adding to the torsional rigidity, only weight ... leaving you with less stiffness and the same weight (in fact the weight would be a little higher as the distance from corner to corner is longer than from edge to edge)....
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