The critical buckling stress of a given truck frame side rail flange is dependent upon the magnitude and stress distribution across the flange. This distribution is a function of the method of load application, cross member spacing, and the type of attachment between the cross member and frame side rail. The tests conducted during this program revealed that based upon the specimens tested they could be made to carry 50% more load for the same overall structural weight by selecting the proper loading system and by choosing the proper cross member spacing.
