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Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
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Документ Study on the applicability of coupled Eulerian-Lagrangian formulation in abrasive waterjet machining simulations(Національний технічний університет "Харківський політехнічний інститут", 2019) Dimopoulos, Christos D.; Karkalos, Nikolaos E.; Markopoulos, Angelos P.Non-conventional machining processes are considered as reliable alternatives to the established conventional ones in the case of processing of difficult-to-cut materials. Especially, Abrasive Waterjet Machining (AWJM) is advantageous for this purpose, as it can handle a wide range of workpiece materials and does not cause heat affected zones. In order to study the phenomena occurring during AWJM, numerical simulations should be carried out along with experiments. As machining processes involve significant material deformation, Coupled Eulerian-Lagrangian (CEL) Finite Elements (FE) models have been proven significantly accurate for this purpose, compared to pure Lagrangian models. Thus, in the present study it is attempted to compare the predicted results of CEL and pure Lagrangian models in the case of AWJM and determine whether this method is applicable for the process or not. Simulation cases based on experimental results are employed and discussion on the predicted cutting zone dimensions, stress and temperature field is conducted.Документ Study on mesh dependence of cutting zone dimensions prediction during abrasive waterjet machining(Національний технічний університет "Харківський політехнічний інститут", 2019) Dimopoulos, Christos D.; Karkalos, Nikolaos E.; Markopoulos, Angelos P.Abrasive Waterjet Machining is a non-conventional material removal process, preferred to be used for the cutting of difficult-to-cut materials, due to its ability to remove material without the use of a tool and without causing heat affected zones. Experimentally, monitoring the phenomena taking place in the cutting area is very difficult, due to various reasons such as the high speed of the particles and the obstruction due to the water stream. Thus, a simulation approach, based on experimental data, is required in order to be able to explain these phenomena. In this work, a 3D thermo-mechanical Finite Element model is presented with realistic representation of the positioning of discrete abrasive particles and the dependence of cutting zone dimensions on the mesh size is investigated. After simulation, results are compared to experimental results, mesh independence study is conducted and finally, conclusions on the optimum mesh size are drawn and observed process characteristics are discussed.