Determination of the Reasonable Length of the Cantilever for Double Cantilever Beams

In the light of the essential theory of material mechanics, the mechanical analysis for double cantilever beams with uniformly distributed load is done. The best length of the cantilever in two conditions is determined, and thus the reasonable length of the cantilever is chosen. The result provides a theoretic basis for engineering practice, and may serve as a reference for project design.