Design and Failure Stress Analysis of Crane Hook by Using Mesh Sensitivity Analysis Approach on Finite Element Method

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Abstract In realistic applications, crane hooks are used mostly under high loading conditions and subjected to high-stress concentrations which cause failure of these material handling equipment. Failure mainly occurs due to high-stress concentration on the hook at a specific point. Determining these maximum stress concentrations that cause failure and the point where they occur is vital in reducing the failure of hooks. Therefore, FEM analyses are useful for obtaining an understanding of stress concentration on hooks that lead to failure. In this study, both analytical and numerical analyses were performed on the hook which is subjected to a vertical load of 50ton (490.5kN) for specifically selected hook material. The maximum stress resulting from analytical calculations is 1410.1MPa, which is safe as compared to the yield strength of hook material. The maximum Von Mises stress, maximum principal strain, and total deformation of hook were determined by numerical method. To produce more reliable results numerically on ANSYS Workbench 19.2 mesh sensitivity analysis (MSA) was performed. The meshing size dependence of maximum stress was studied by refinement of meshes. From the convergence study, the maximum failure stress determined is 1412.4MPa, which is also safe as compared to the yield strength of the material. Even if there are some variations in the results of analytical and numerical approaches, both results are safe for the loading condition of the crane hook.

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