Optimization and Fatigue Analysis of a Crane Hook Using Finite Element Method

Abstract

Stress analysis plays an important role in the design of structures like crane hook under loading conditions. Crane hook is a reliable lifting component being used in industries. Structure failure of crane hook occurs because of the stress induced due to repetitive loading and unloading conditions. In this study, solid modeling of crane hook having trapezoidal cross-section referring to one of its existing design is done using SOLIDWORKS. Further, analyses are carried out in ANSYS Workbench and nCode DesignLife. The lengths of two parallel sides of the cross-section of crane hook are varied and different candidates are obtained for loading capacity of 30 ton on the basis of Mass, total Displacement and Von-Mises stress.This is done to reduce weight and balance economy. Further, out of these candidates, best candidates are considered and fatigue analysis is performed on these candidates.

Hook crane shape design improvement for reducing the maximum stress

“…Similar comparisons between trapezoidal, triangular, rectangular and circular cross-sections of a crane hook were simulated by Bergaley and Purohit [10], Gopichand et al [11], Mehendale and Wankhade [14], etc, all concluding that the smallest maximum stress on the inner width of the crane hook corresponds to the trapezoidal cross-section. In order to further reduce the stress concentration, some curvature should be considered at the corner of the trapezoidal cross-section [10,12,13].…”

“…Still in order to minimize the induced maximum stress, several studies [10,12,13] have tried to optimize the widths of the two bases of the trapezoidal crosssection (inner and outer width) of the hook crane. For example, in [13] the value of the large base B of the trapezoid, which is located at the inner side of the hook, is varied from 110 mm to 130 mm, whereas the value of the small base b of the trapezoid, located at the outer side of the hook, is varied from 45 mm to 55 mm.…”

“…In what concerns the crane hook materials considered in the above-mentioned FEM studies, it is quite common to use alloy steel AISI 4340, as in [12], or alloy steel AISI 4140, as used in [13].…”

“…The evolution of the idea of what shape to use in order to reduce the maximum stress is well illustrated in Fig. 5: the rectangular shape is the simplest one, the trapezoidal shape is the one used predominantly in the literature [1,3,[5][6][7][9][10][11][12][13][14]. Figure 3a shows the von Mises stress distribution obtained by SolidWorks Simulation for the trapezoidal cross-section case, while the displacements of this simulation are presented in Fig.…”

Vinç Kancalarının Kırılma Mekaniği Yaklaşımı ile Yorulma Dayanımlarının İncelenmesi

“…Singh ve Rohilla [19], yapmış oldukları çalışmada; sonlu eleman yazılımı üzerinden gerilme analizini trapez kesitli farklı boyutlara sahip kancalar için gerçekleştirmişlerdir. Yapmış oldukları bu çalışmanın esas amacı kanca ağırlıklarını azaltmak ve ekonomik açıdan dengeleme yapmaktır.…”