264 results found
Shen L, Denner F, morgan N, et al., Marangoni effect on small-amplitude capillary waves in viscous fluids, Physical Review E, ISSN: 1539-3755
Arana C, Evangelou SA, Dini D, 2017, Series Active Variable Geometry Suspension application to comfort enhancement, CONTROL ENGINEERING PRACTICE, Vol: 59, Pages: 111-126, ISSN: 0967-0661
Bodnarchuk MS, Dini D, Heyes DM, et al., 2017, Molecular Dynamics Studies of Overbased Detergents on a Water Surface, LANGMUIR, Vol: 33, Pages: 7263-7270, ISSN: 0743-7463
Bodnarchuk MS, Doncom KEB, Wright DB, et al., 2017, Polyelectrolyte pK(a) from experiment and molecular dynamics simulation, RSC ADVANCES, Vol: 7, Pages: 20007-20014, ISSN: 2046-2069
Ewen JP, Gattinoni C, Zhang J, et al., 2017, On the effect of confined fluid molecular structure on nonequilibrium phase behaviour and friction, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 17883-17894, ISSN: 1463-9076
Ewen JP, Restrepo SE, Morgan N, et al., 2017, Nonequilibrium molecular dynamics simulations of stearic acid adsorbed on iron surfaces with nanoscale roughness, TRIBOLOGY INTERNATIONAL, Vol: 107, Pages: 264-273, ISSN: 0301-679X
Forte AE, Galvan S, Dini D, 2017, Models and tissue mimics for brain shift simulations., Biomech Model Mechanobiol
Capturing the deformation of human brain during neurosurgical operations is an extremely important task to improve the accuracy or surgical procedure and minimize permanent damage in patients. This study focuses on the development of an accurate numerical model for the prediction of brain shift during surgical procedures and employs a tissue mimic recently developed to capture the complexity of the human tissue. The phantom, made of a composite hydrogel, was designed to reproduce the dynamic mechanical behaviour of the brain tissue in a range of strain rates suitable for surgical procedures. The use of a well-controlled, accessible and MRI compatible alternative to real brain tissue allows us to rule out spurious effects due to patient geometry and tissue properties variability, CSF amount uncertainties, and head orientation. The performance of different constitutive descriptions is evaluated using a brain-skull mimic, which enables 3D deformation measurements by means of MRI scans. Our combined experimental and numerical investigation demonstrates the importance of using accurate constitutive laws when approaching the modelling of this complex organic tissue and supports the proposal of a hybrid poro-hyper-viscoelastic material formulation for the simulation of brain shift.
Forte AE, Gentleman SM, Dini D, 2017, On the characterization of the heterogeneous mechanical response of human brain tissue, BIOMECHANICS AND MODELING IN MECHANOBIOLOGY, Vol: 16, Pages: 907-920, ISSN: 1617-7959
Gurrutxaga-Lerma B, Balint DS, Dini D, et al., 2017, A Dynamic Discrete Dislocation Plasticity study of elastodynamic shielding of stationary cracks, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, Vol: 98, Pages: 1-11, ISSN: 0022-5096
Gurrutxaga-Lerma B, Shehadeh MA, Balint DS, et al., 2017, The effect of temperature on the elastic precursor decay in shock loaded FCC aluminium and BCC iron, INTERNATIONAL JOURNAL OF PLASTICITY, Vol: 96, Pages: 135-155, ISSN: 0749-6419
Hajishafiee A, Kadiric A, Ioannides S, et al., 2017, A coupled finite-volume CFD solver for two-dimensional elasto-hydrodynamic lubrication problems with particular application to rolling element bearings, TRIBOLOGY INTERNATIONAL, Vol: 109, Pages: 258-273, ISSN: 0301-679X
Heyes D, Dini D, Smith E, et al., 2017, Nanowire stretching by Non-equilibrium Molecular Dynamics, Physica Status Solidi B: Basic Solid State Physics, ISSN: 0370-1972
Hu H, Wen J, Bao L, et al., 2017, Significant and stable drag reduction with air rings confined by alternated superhydrophobic and hydrophilic strips, SCIENCE ADVANCES, Vol: 3, ISSN: 2375-2548
Knight C, Abdol Azis MH, O'Sullivan C, et al., 2017, Sensitivity analysis of Immersed Boundary Method simulations of fluid flow in dense polydisperse random grain packings, ISSN: 2101-6275
© The Authors, published by EDP Sciences, 2017. Polydisperse granular materials are ubiquitous in nature and industry. Despite this, knowledge of the momentum coupling between the fluid and solid phases in dense saturated grain packings comes almost exclusively from empirical correlations [2-4, 8] with monosized media. The Immersed Boundary Method (IBM) is a Computational Fluid Dynamics (CFD) modelling technique capable of resolving pore scale fluid flow and fluid-particle interaction forces in polydisperse media at the grain scale. Validation of the IBM in the low Reynolds number, high concentration limit was performed by comparing simulations of flow through ordered arrays of spheres with the boundary integral results of Zick and Homsy  . Random grain packings were studied with linearly graded particle size distributions with a range of coefficient of uniformity values (C u = 1.01, 1.50, and 2.00) at a range of concentrations (Φ ∈ [0.396; 0.681]) in order to investigate the influence of polydispersity on drag and permeability. The sensitivity of the IBM results to the choice of radius retraction parameter  was investigated and a comparison was made between the predicted forces and the widely used Ergun correlation .
Ma S, Scaraggi M, Lin P, et al., 2017, Nanohydrogel Brushes for Switchable Underwater Adhesion, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 121, Pages: 8452-8463, ISSN: 1932-7447
Maćkowiak S, Heyes DM, Pieprzyk S, et al., 2017, Non-Equilibrium Phase Behavior of Confined Molecular Films at Low Shear Rates, physica status solidi (b), Pages: 1600862-1600862, ISSN: 0370-1972
McCarron R, Stewart D, Shipway P, et al., 2017, Sliding wear analysis of cobalt based alloys in nuclear reactor conditions, WEAR, Vol: 376, Pages: 1489-1501, ISSN: 0043-1648
Profito FJ, Vladescu S-C, Reddyhoff T, et al., 2017, Transient experimental and modelling studies of laser-textured micro-grooved surfaces with a focus on piston-ring cylinder liner contacts, TRIBOLOGY INTERNATIONAL, Vol: 113, Pages: 125-136, ISSN: 0301-679X
Profito FJ, Vladescu S-C, Reddyhoff T, et al., 2017, Experimental Validation of a Mixed-Lubrication Regime Model for Textured Piston-Ring-Liner Contacts, MATERIALS PERFORMANCE AND CHARACTERIZATION, Vol: 6, Pages: 112-129, ISSN: 2379-1365
Smith ER, Heyes DM, Dini D, 2017, Towards the Irving-Kirkwood limit of the mechanical stress tensor, JOURNAL OF CHEMICAL PHYSICS, Vol: 146, ISSN: 0021-9606
Tan Z, Bernardini A, Konstantinou I, et al., 2017, Diffusion Measurement and Modelling, European Robotics Forum 2017
Tan Z, Forte AE, Parisi C, et al., 2017, Composite hydrogel: A new tool for reproducing the mechanicalbehaviour of soft human tissues, WTC 2017
Verschueren J, Gurrutxaga-Lerma B, Balint DS, et al., 2017, The injection of a screw dislocation into a crystal: Atomistics vs. continuum elastodynamics, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, Vol: 98, Pages: 366-389, ISSN: 0022-5096
Wilson R, Dini D, van Wachem B, 2017, The influence of surface roughness and adhesion on particle rolling, Powder Technology, Vol: 312, Pages: 321-333, ISSN: 0032-5910
The influence of surface roughness and contact adhesion on the rolling behaviour of dry particles has been investigated. Rough particle surfaces are approximated using an array of spheres, the properties of which are informed by random processes. An analytical model has been derived by considering the torques that a particle experiences. Two mechanisms of rolling resistance are explored – a stationary particle experiencing a tangential force, and a dynamically rolling particle. The analytical model is found to agree well with simulations of the equivalent system using the discrete element model. Adhesive forces are found to increase rolling resistance in all cases. The complex consequences of varying the height variance and length scale of the surface roughness are reproduced accurately by the analytical model.
Yu M, Evangelou SA, Dini D, 2017, Model Identification and Control for a Quarter Car Test Rig of Series Active Variable Geometry Suspension, 20th IFAC World Congress, Publisher: Elsevier, ISSN: 1474-6670
In this paper, a quarter car test rig is utilized to perform an experimental study of the singlelinkvariant of the Series Active Variable Geometry Suspension (SAVGS). A nonlinear model of the testrig is identified with the use of a theoretical quarter car model and the rig’s experimental frequencyresponse. A linear equivalent modeling method that compensates the geometric nonlinearity is alsoadopted to synthesize an H-infinity control scheme. The controller actively adjusts the single-linkvelocity in the SAVGS to improve the suspension performance. Experiments are performed to evaluatethe SAVGS practical feasibility, the performance improvement, the accuracy of the nonlinear model andthe controller’s robustness.
Arana C, Evangelou SA, Dini D, 2016, Series Active Variable Geometry Suspension Application to Chassis Attitude Control, IEEE-ASME TRANSACTIONS ON MECHATRONICS, Vol: 21, Pages: 518-530, ISSN: 1083-4435
Ewen JP, Gattinoni C, Morgan N, et al., 2016, Nonequilibrium Molecular Dynamics Simulations of Organic Friction Modifiers Adsorbed on Iron Oxide Surfaces, LANGMUIR, Vol: 32, Pages: 4450-4463, ISSN: 0743-7463
Ewen JP, Gattinoni C, Thakkar FM, et al., 2016, Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces, TRIBOLOGY LETTERS, Vol: 63, ISSN: 1023-8883
Ewen JP, Gattinoni C, Thakkar FM, et al., 2016, A Comparison of Classical Force-Fields for Molecular Dynamics Simulations of Lubricants, Materials, Vol: 9, ISSN: 1996-1944
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