Three-dimensional finite element analysis and strength evaluation of link chains in chain hoists subjected to impact loads

Abstract

Elastoplastic stresses in link chains subjected to impact loads are analysed using a finite element method. The code employed is ‘DYNA3D’. Chain strength is predicted by using the von Mises criterion. The effects of chain dimensions on the stress distribution, a location where rupture occurs, and on the chain strength are examined. Measurement of the strains in link chain and impact tensile tests were also performed when impact loads were applied to a link. Fairly good agreement is seen between the numerical and the experimental results. It was found that chain strength can be predicted by using the relationship between chain elongation and impact energy. The chain strength can be improved by optimizing the chain geometry (pitch, width and compressed depth) using finite element analysis.

Keywords

finite element method elastoplastic stresses link chains von Mises criterion impact tensile tests

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