This article presents a research, conducted by 3-D computer models and the finite element method (FEM), on the stressed state of fork lift arms of 12.5 kN, 20 kN and 30 kN lift capacities. The folded region of the fork has been proved as being inconsistent with the classical assumption of a curved beam of high curvature. Formulations are drawn and some suggestions are given regarding computation of parameters of that folded region.
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