Browsing by Author "Papanikolaou, Michail"

Browsing by Author "Papanikolaou, Michail"

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  • Alternation of the dynamic coefficients of short journal bearings due to wear 
    Papanikolaou, Michail; Farmakopoulos, Michael G.; Papadopoulos, Chris A. (Emerald, 2015-05-31)
    Purpose – Wear in journal bearings occurs when the operating conditions (high load, high temperature,low angular velocity or low viscosity), downgrade the ability of the bearing to carry load. The wear depth increases ...
  • A computational framework towards energy efficient casting processes 
    Papanikolaou, Michail; Pagone, Emanuele; Salonitis, Konstantinos; Jolly, Mark R.; Makatsoris, Makatsoris (Springer, 2018-12-01)
    Casting is one of the most widely used, challenging and energy intensive manufacturing processes. Due to the complex engineering problems associated with casting, foundry engineers are mainly concerned with the quality of ...
  • Contact stiffness effects on nanoscale high-speed grinding: A molecular dynamics approach 
    Papanikolaou, Michail (Elsevier, 2019-07-04)
    One of the most important grinding parameters is the real depth of cut which is always lower than its programmed value. This is because in reality abrasive grains of the grinding wheel are not fixed but attached to a bonding ...
  • Design optimisation of the feeding system of a novel counter-gravity casting process 
    Papanikolaou, Michail; Pagone, Emanuele; Georgarakis, Konstantinos; Rogers, Keith; Jolly, Mark R.; Salonitis, Konstantinos (MDPI, 2018-10-11)
    The appropriate design of feeders in a rigging system is critical for ensuring efficient compensation for solidification shrinkage, thus eliminating (shrinkage-related) porosity and contributing to the production of superior ...
  • Effects of crystallinity on residual stresses via molecular dynamics simulations 
    Papanikolaou, Michail; Rodriguez-Hernandez, Francisco; Jolly, Mark R.; Salonitis, Konstantinos (American Physical Society, 2022-10-05)
    Mechanical properties of materials are highly dependent on microstructure. One characteristic example is tensile stresses at the grain boundaries, which is one of the most critical factors in crack nucleation. Although ...
  • Effects of surface roughness on shear viscosity 
    Papanikolaou, Michail; Frank, Michael; Drikakis, Dimitris (American Physical Society, 2017-03-13)
    This paper investigates the effect of surface roughness on fluid viscosity using molecular dynamics simulations. The three-dimensional model consists of liquid argon flowing between two solid walls whose surface roughness ...
  • Energy resilient foundries: the “Small is beautiful” projects 
    Jolly, Mark R.; Salonitis, Konstantinos; Pagone, Emanuele; Papanikolaou, Michail; Saxena, Prateek (Springer, 2022-02-05)
    Applying the concept of “small is beautiful” into a conservative relatively low technology manufacturing sector where the “economies of scale” argument has been used to build ever more so-called efficient process lines is ...
  • Fractal roughness effects on nanoscale grinding 
    Papanikolaou, Michail; Salonitis, Konstantinos (Elsevier, 2018-10-20)
    Three-dimensional Molecular Dynamics simulations have been performed to investigate the effects of fractal roughness on nanoscale grinding. The first part of this investigation focuses on the effects of the workpiece rough ...
  • Grain size effects on nanocutting behaviour modelling based on molecular dynamics simulations 
    Papanikolaou, Michail; Salonitis, Konstantinos (Elsevier, 2020-11-16)
    Grain size is one of the most critical factors affecting the mechanical and thermal properties of metallic materials. In this study the effect of the grain size of a workpiece made of pure Aluminium on the nanocutting ...
  • Heat transfer across a fractal surface 
    Frank, Michael; Papanikolaou, Michail; Drikakis, Dimitris; Salonitis, Konstantinos (American Institute of Physics (AIP), 2019-10-02)
    The effects of surface irregularities and imperfections on the thermal resistance at a solid-liquid interface have been investigated using molecular dynamics. The molecular model comprises liquid argon confined between ...
  • Investigation of the subsurface temperature effects on nanocutting processes via molecular dynamics simulations 
    Papanikolaou, Michail; Hernandez, Francisco Rodriguez; Salonitis, Konstantinos (MDPI, 2020-09-10)
    In this investigation, three-dimensional molecular dynamics simulations have been performed in order to investigate the effects of the workpiece subsurface temperature on various nanocutting process parameters including ...
  • Large-scale molecular dynamics simulations of homogeneous nucleation of pure aluminium 
    Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R.; Frank, Michael (MDPI, 2019-11-12)
    Despite the continuous and remarkable development of experimental techniques for the investigation of microstructures and the growth of nuclei during the solidification of metals, there are still unknown territories around ...
  • Life cycle and energy assessment of automotive components manufacturing: The dilemma between aluminium and cast iron 
    Salonitis, Konstantinos; Jolly, Mark R.; Pagone, Emanuele; Papanikolaou, Michail (MDPI, 2019-07-03)
    Considering the manufacturing of automotive components, there exists a dilemma around the substitution of traditional cast iron (CI) with lighter metals. Currently, aluminum alloys, being lighter compared to traditional ...
  • Metal casting energy efficient metrics for material selection of automotive parts 
    Pagone, Emanuele; Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R. (Springer, 2018-12-01)
    The automotive sector is one of the main end-use markets for metal casting worldwide. The strong competitive pressure typical of this industry have been influenced in the recent years by sustainability as a new factor ...
  • Minimising defect formation in sand casting of sheet lead: a DoE approach 
    Prabhakar, Arun; Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R. (MDPI, 2020-02-13)
    Sand casting of lead sheet is a traditional manufacturing process used up to the present due to the special features of sand cast sheet such as their attractive sheen. Similarly to any casting process, sand casting of lead ...
  • Molecular dynamics simulations of confined liquids in nanochannels with rough walls 
    Papanikolaou, Michail (Cranfield University, 2017-02)
    During the past few decades Micro-Electromechanical systems (MEMS) have been increasingly used in various engineering domains ranging from electronics to biological sciences as nowadays they can be massively produced in ...
  • Molecular dynamics simulations of the evolution of residual stresses during rapid solidification of aluminium 
    Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R. (Springer, 2021-02-24)
    It is well known that residual stresses are quite common in castings and they emerge due to uneven cooling conditions. Nowadays, the development of atomistic modelling techniques has allowed for the in-depth investigation ...
  • Molecular dynamics simulations of the solidification of pure aluminium 
    Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R. (Springer, 2020-01-28)
    Despite the continuous and remarkable development of experimental techniques for the investigation of microstructures and the growth of nuclei during the solidification of metals, there are still unknown territories around ...
  • Multi-criteria decision-making for the life cycle of sustainable high pressure die casting products 
    Pagone, Emanuele; Papanikolaou, Michail; Salonitis, Konstantinos; Jolly, Mark R. (Inderscience, 2020-04-23)
    Although a significant body of literature has been devoted to establish metrics capable of measuring the performance of manufacturing systems (including foundries) and their influence on decision-making, there is a scarcity ...
  • Nanoflow over a fractal surface 
    Papanikolaou, Michail; Frank, Michael; Drikakis, Dimitris (American Institute of Physics (AIP), 2016-08-01)
    This paper investigates the effects of surface roughness on nanoflows using molecular dynamics simulations. A fractal model is employed to model wall roughness, and simulations are performed for liquid argon confined by ...