Abstract
This paper analyzed the effects of boundary conditions on the stress distribution of hydraulic support with the static finite element (FE) model. Five loading conditions are considered in this study, including: 1) canopy torsional loading, 2) canopy eccentric loading, 3) base torsional loading, 4) base diagonal loading, and 5) base symmetrical loading. In order to verify the simulation results obtained from the FE model, the corresponding experiments have also been performed. Based on the comparison between simulation and experimental results, the effects of pin-joint simplified methods and boundary conditions are evaluated in terms of accuracy and efficiency. Moreover, the new elastic-support boundary is also proposed to improve the simulation accuracy under conditions 2, 3, 4, and 5. The results show that bonded contact between the pin and shaft hole has high efficiency and accuracy compared with the frictional contact. The frictional contact boundary is reasonable under condition 1. However, the elastic-support boundary is suggested to be adopted to improve calculation accuracy for the stress distribution of the constraint components (canopy or base) under conditions 2, 3, 4, and 5.
Highlights
The hydraulic support is one of the important safety supporting equipment in the process of coal mining.[1,2,3] Its safety and reliability are very important for the safe mining of coal mines
The comparison results in Section 3.2.1 show that the frictional contact boundary can not accurately simulate the stress distribution of the canopy
The effects of the contact between the pin and shaft hole, and the boundary conditions on the stress distribution of hydraulic support are discussed based on the finite element simulation and experiment
Summary
The hydraulic support is one of the important safety supporting equipment in the process of coal mining.[1,2,3] Its safety and reliability are very important for the safe mining of coal mines. Lu et al.[18] established a beam-shell combined the FE model of hydraulic support, in which a pin-joint adopted the beam element, and the other components adopted the shell element They analyzed the influence of boundary constraints, various loads, and different support heights on the simulated stresses and verified the proposed model with measured stresses. Considering the pin-joint with the frictional contact element, Gao and Zhou[21] established a similar shell-solid FE model and the constraint boundary is similar to that in Li et al.[20] Li22 established a FE model of hydraulic support by using tetrahedral and hexahedral mixed elements, analyzed the stress distribution under the canopy and base concentrated loading conditions respectively, and verified the effectiveness of the simulated results by experiment.
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