Table 3 - uploaded by Biswaranjan Pati
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A crane hook plays an important role for material handling from small to large industries. During transfer of heavy load, the hook is subjected to failure due to severe stress accumulation at its critical section. The design of crane hook is concerned with certain parameters like area of cross section, material, radius of curvature etc. The present...
Citations
... As can be seen, T and I cross-sections are increasingly used in analyzes of these types of structures. In the paper [9], comparative stress analysis was performed for the standard trapezoidal cross-section of the hook structure, as well as for T and I cross-sections. Modeling of these structures was performed using CATIA software package, and ANSYS Workbench was used for analysis. ...
This paper presents analysis and optimization of the geometric parameters of T and I cross-sections of crane hook, observed for the most critical location of its structure. The reduction of the cross-sectional area of crane hook was set as the goal in this study. The stresses at characteristic points of the most critical cross-section are taken as constraint functions, calculated according to Winkler-Bach theory, and some geometric conditions are set, too. Two metaheuristic algorithms based on the laws of physics, Charged System Search (CSS) algorithm and Thermal Exchange Optimization (TEO) algorithm, were selected for optimization methods, using by MATLAB software package. The goal of this research is to show that the proposed cross-sections give significant savings in comparison to standard crane hook, wherein the one standard capacity was observed. Both observed cross-sections were analyzed in two variants, and the comparison of their optimization results was performed to show which one achieves the best results. Also, the comparison of the applied optimization algorithms was performed.
... The thickness is taken as 't' for all the sheets. The ratio of thickness and length is a constant, which serves as local stability conditions: [4] = 1 , = 2 . ...
This paper discusses the optimization of cross section of telescopic boom of mobile cranes. The extruded section is taken into consideration for the optimization problem. The problem has been solved using Lagrange Multipliers method. The area of cross section of the boom has been taken as the objective function, so as to minimize the mass, whereas the constraint function has been taken as a general function of hardness and stability. The above parameters allow us to form a mathematical model for numerical analysis and thus obtain the optimum dimensions for the cross section.
... In this paper, different materials are analyzed in the analysis. The T-cross section is also discussed in works [7], [8], [9] and [10] using ANSYS software package for the analysis of stress states. ...
... In the paper [8], a comparative analysis of the stress states is performed for the standard trapezoidal cross-section of the hook carrier, as well as for the T and I cross-section. Modeling of these carriers is done using CATIA software package. ...
This study presents analysis and optimization of the geometric parameters of T-cross section of crane hook. The reduction of the cross-sectional area of the hook is set as the main objective of this research. The permissible stresses in the crane hook characteristic points at the most critical place of her construction are taken as the limitation functions. Also, in the second part, analysis and optimization of certain geometric constraints are taken. The maximum stresses in characteristic points are calculated according to Winkler-Bach theory, where the construction of the hook is treated as a curved beam.
The optimization process is performed by using the five optimization algorithms i.e. by using the generalized reduced gradient method (GRG2) and the evolution algorithm (EA) in the Analysis module (Ms EXCEL software package), as well as the MATLAB software package (fmincon functions within the Optimization Toolbox module) and the genetic algorithm (GA) and by using a particle optimization algorithm (PSO).
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.
