Discrete element method for adhesion properties evaluation of deep-sea sediment from macro and micro perspectives

Abstract

The adhesion between the mining machine and the deep-sea sediments will significantly affect the driving performance of the mining machine in the deep-sea environment. When the mining machine and the deep-sea sediment interaction simulation was carried out, the accuracy of the particle interaction parameters will directly affect the simulation results. This study proposed a method to systematically calibrate the interaction parameters between deep-sea sediment and grouser through the combination of experiment and simulation. The uniaxial compression test and macro adhesion test and corresponding discrete element numerical simulation were carried out, modifying the contact parameters until the simulation results are close to the experimental results. Then the micro-parameters of the JKR adhesion contact model were back calibrated with the test results, and the contact parameters between soil particle-soil particle and soil particle-metal are calibrated. Besides, the adhesion test shows that the adhesion forces were ranked in the order of 5052<STi80<TA2<TC4 under the same surface roughness, which indicates the aluminum alloy 5052 has the best anti-adhesion performance. The relationship between surface adhesion force and microscopic contact parameters was studied by discrete element numerical simulation, and the result shows that the coefficient of static friction and the coefficient of rolling friction has little effect on adhesion force. While it is mainly affected by the coefficient of restitution and surface energy, the surface adhesion force tends to decrease with the increase of the coefficient of restitution and increase with the growth of surface energy. The obtained parameters of soil particle to soil particle and soil particle to metal affecting the adhesion can contribute to the design optimization for the grouser of mining machines to decrease surface adhesion and enhance its movability and mining efficiency.

Keywords

discrete element modelling / deep-sea sediment / JKR adhesion contact model / contact parameters / surface adhesion force

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