Abstract
Up to now, behaviors of link chains in chain hoist subjected to impact loads have not been clarified yet. In this paper, an elastoplastic analysis is carried out using the finite-element method (DYNA3D) in order to clarify the stress distribution and to predict the tensile strength of the link chains subjected to impact loads. The tensile strength is evaluated by von Mises' criterion. The effects of the dimensions of the link chains on the stress distributions and the tensile strength are shown. For verification, experiments were performed on strains and tensile strength of link chains when impact loads are applied to the chains. The analytical results are in fairly good agreement with the experimental results. As a result, it is shown that the strength can be evaluated by F. E. M. analysis. In addition, it is clarified that the impact tensile strength of link chains can be improved by optimizing the pitch, the width, the shape of the cross section and the compressed depth.
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