Discrete element thermomechanical modelling of rock cutting with valuation of tool wear

Abstract

The paper presents a thermomechanical discrete element model of rock cutting process. The thermomechanical formulation of the discrete element method considers mechanical and thermal phenomena and their reciprocal influence. The thermal model developed for transient heat conduction problems takes into account conductive heat transfer at the contact between particles and convection on the free surface. The thermal and mechanical problems are coupled by consideration of: (1) heat generated due to friction which is calculated in the mechanical problem and passed to the thermal solution, (2) influence of thermal expansion on mechanical interaction between particles. Estimation of temperature dependent wear has been included into the contact model. The coupled problem is solved using the staggered scheme.The thermomechanical algorithm has been implemented in a discrete element program and applied to simulation of rock cutting with single pick of a dredge cutter head. Numerical results confirm good performance of the developed algorithm.

Modified algorithm for generating high volume fraction sphere packings

“…The surface comprised 180 triangles and the packing took 352,203 spheres with diameters in the interval [4,5]. Applications of this model are described in [18], where a thermomechanical Discrete Element model is used to simulate the mechanical and thermal phenomena associated with the tool wear in the rock cutting process. There also exists research about soil and tillage-tool interaction using DEM [19].…”

Contributions to the generalization of advancing front particle packing algorithms

“…This packing has values of porosity and coordination number equal to 0.47 and 6, respectively. Applications of this model are described in , where a thermomechanical DEM is used to simulate the mechanical and thermal phenomena associated with the tool wear in the rock cutting process. There also exists research about soil and tillage‐tool interaction using DEM .…”

On the thermal response of a surface deposited laser-irradiated powder particle

“…We refer the reader to Duran [28], Pö schel and Schwager [29], Onate et al [30][31][32], Rojek et al [33,34], Carbonell et al [35], Labra and Onate [36], Leonardi et al [37], Cante et al [38], Bolintineanu et al [39], Avci and Wriggers [40] and Zohdi [41][42][43][44][45][46][47][48][49][50][51] for more computationallyoriented techniques aligned with manufacturing processes involving particles.…”