Publications
458 results found
Medina S, Dini D, 2014, A numerical model for the deterministic analysis of adhesive rough contacts down to the nano-scale, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, Vol: 51, Pages: 2620-2632, ISSN: 0020-7683
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- Citations: 56
Bodnarchuk MS, Heyes DM, Dini D, et al., 2014, Role of Deprotonation Free Energies in p<i>K</i><sub>a</sub> Prediction and Molecule Ranking, JOURNAL OF CHEMICAL THEORY AND COMPUTATION, Vol: 10, Pages: 2537-2545, ISSN: 1549-9618
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- Citations: 12
Steele JAM, McCullen SD, Callanan A, et al., 2014, Combinatorial scaffold morphologies for zonal articular cartilage engineering, ACTA BIOMATERIALIA, Vol: 10, Pages: 2065-2075, ISSN: 1742-7061
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- Citations: 104
Hills DA, Dini D, 2014, Common edge contacts: Effect of interface line orientation, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, Vol: 81, Pages: 73-76, ISSN: 0020-7403
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- Citations: 4
Hills DA, Flicek RC, Dini D, 2014, A discussion of: Development of a complete contact fretting test device by J Juoksukangas et al., PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol: 228, Pages: 123-126, ISSN: 1350-6501
Arana C, Evangelou SA, Dini D, 2014, Car attitude control by series mechatronic suspension, 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 10688-10693, ISSN: 2405-8963
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- Citations: 1
Maćkowiak S, Gattinoni C, Heyes DM, et al., 2014, Boundary-controlled barostats for slab geometries in molecular dynamics simulations, Pages: 2712-2715
Thaitirarot A, Hills D, Dini D, 2014, Contact mechanics of frictional lap joint, Pages: 2228-2231
Dini D, Mastrandrea LN, Giacopini M, et al., 2014, Numerical investigation of the cavitation damage in a high performance engine conrod big end bearing via a mass-conserving complementarity algorithm, Pages: 586-589
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- Citations: 9
Mattei L, Campioni E, Accardi MA, et al., 2014, Finite element analysis of the meniscectomised tibio-femoral joint: implementation of advanced articular cartilage models, COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING, Vol: 17, ISSN: 1025-5842
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- Citations: 11
Heyes DM, Smith ER, Dini D, et al., 2014, The method of planes pressure tensor for a spherical subvolume, The Journal of Chemical Physics, Vol: 140, Pages: ---
Gurrutxaga-Lerma B, Balint DS, Dini D, et al., 2014, Dynamic Discrete Dislocation Plasticity, ADVANCES IN APPLIED MECHANICS, VOL 47, Editors: Bordas, Publisher: ELSEVIER ACADEMIC PRESS INC, Pages: 93-224, ISBN: 978-0-12-800130-1
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- Citations: 16
Roberts O, Lunt AJG, Ying S, et al., 2014, A study of phase transformation at the surface of a zirconia ceramic, Publisher: Proceedings of the World Congress on Engineering 2014, Pages: 1173-1177
Yttria Partially Stabilized Zirconia (YPSZ) is one of the most important engineering ceramic materials in that it displays a whole host of outstanding structural and functional properties. Of particular importance for load-bearing applications is the remarkable fracture toughness of YPSZ that arises from its ability to undergo martensitic transformation, a phase transformation that is dependent on stress, temperature, time, humidity, grain size, and the proximity of an interface. The present study was aimed at revealing the influence of the thermal ageing on the tetragonal to monoclinic phase transformation in the near-surface regions of YPSZ. In order to perform qualitative and quantitative characterisation of the phase composition, three principal microscopic techniques were employed: atomic force microscopy, depth resolved Raman micro-spectroscopy, and synchrotron X-ray diffraction. Satisfactory consistency was achieved between the results obtained using different techniques. Moreover, the data obtained in this way displayed complementarity that provided valuable input for the development of thermodynamic modelling of the complex inter-dependence between phase state and processing history of zirconia ceramics.
Botta F, Dini D, Schwingshackl C, et al., 2013, Optimal Placement of Piezoelectric Plates to Control Multimode Vibrations of a Beam, Advances in Acoustics and Vibration, Vol: 2013, ISSN: 1687-627X
Damping of vibrations is often required to improve both the performance and the integrity of engineering structures, for example, gas turbine blades. In this paper, we explore the possibility of using piezoelectric plates to control the multimode vibrations of a cantilever beam. To develop an effective control strategy and optimize the placement of the active piezoelectric elements in terms of vibrations amplitude reduction, a procedure has been developed and a new analytical solution has been proposed. The results obtained have been corroborated by comparison with the results from a multiphysics finite elements package (COMSOL), results available in the literature, and experimental investigations carried out by the authors. © 2013 Fabio Botta et al.
Botta F, Dini D, de Lieto Vollaro R, 2013, A new function for the optimal placement of piezoelectric plates to control multimode vibrations of a rotating beam, International Journal of Engineering and Technology, Vol: 5, Pages: 4472-4488, ISSN: 2319-8613
Damping of vibrations is often required to improve both the performances and the integrity of engiengineering structures, e.g. gas turbine blades. In [24] some of the authors have proposed a new function to control the multimode vibrations of a fixed beam. In this article this methodology has been extended to a rotating cantilever beam. To develop an effective control strategy, and optimize the placement of the active piezoelectric elements in terms of vibrations amplitude reduction, a procedure has been developed and a new analytical solution has been proproposed. The results obtained have been corroborated by comparison with the results from a multi-physics finite elements package (COMSOL) and data from other models available in the literature.
Botta F, Marx N, Dini D, et al., 2013, Experimental results for optimal placement of piezoelectric plates for active vibration control of a cantilever beam, International Journal of Engineering and Technology, Vol: 5, Pages: 4489-4494, ISSN: 2319-8613
The fatigue phenomena correlated to the gas turbine blades vibrations can lead to catastrophic failure. To damp the vibrations amplitude typically damping passive systems are used. In the last years the interest in the piezoelectric materials, and their use as damping elements, has received considerable attention by many researchers. Recently different research groups have started to study their use in blades of turbomachinery. Because of their effectiveness strongly depends on their position, some of the authors have proposed ([15], [17]) a new model to find the optimal position to control the multimode vibrations. Such model has been corroborated by experimental results for different combinations of excited eigenmodes ([16], [18]]). In this paper the authors present new experimental results with the aim to increase the knowledge of the optimal position of the piezoelectric plates when different eigenmodes are involved.
Smith ER, 2013, ON THE COUPLING OF MOLECULAR DYNAMICS TO CONTINUUM COMPUTATIONAL FLUID DYNAMICS
Molecular dynamics (MD) is a discrete modelling technique that is used to capture the nano-scale motion of molecules. MD can be used to accurately simulate a range of physical problemswhere the continuum assumption breaks down. Examples include surface interaction, complexmolecules, local phase changes, shock waves or the contact line between fluids. However, beyondvery small systems and timescales (μm and msec), MD is prohibitively expensive. Continuumcomputational fluid dynamics (CFD), on the other hand, is easily capable of simulating scales ofengineering interest, (m and s). However, CFD is unable to capture micro-scale effects vital formany modern engineering fields, such as nanofluidics, tribology, nano-electronics and integratedcircuit development. This work details the development of a set of techniques that combine theadvantages of both continuum and molecular modelling methodologies, allowing the study ofcases beyond the range of either technique alone.The present work is split into both computational and theoretical developments. The com-putational aspect involves the development of a new high-performance MD code, as well as acoupler (CPL) library to link it to a continuum solver. The MD code is fully verified, has similarperformance to existing MD software and allows simulation of a wide range of cases. The CPLlibrary is a robust, flexible and language independent API and the source code has been madefreely available under the GNU GPL v3 license. Both MD and CPL codes are developed to allowvery large scale simulation on high performance computing (HPC) facilities.The theoretical aspect includes the development of a rigorous mathematical framework andits application to develop novel coupling methodologies. The mathematical framework allowsa discrete molecular system to be expressed in terms of the control volume (CV) formulationfrom continuum fluid dynamics. A discrete form of Reynolds’ transport theorem is thus obtainedallowing both molecular an
Gattinoni C, Heyes DM, Lorenz CD, et al., 2013, Traction and nonequilibrium phase behavior of confined sheared liquids at high pressure, PHYSICAL REVIEW E, Vol: 88, ISSN: 1539-3755
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- Citations: 37
Bertocchi L, Dini D, Giacopini M, et al., 2013, Fluid film lubrication in the presence of cavitation: a mass-conserving two-dimensional formulation for compressible, piezoviscous and non-Newtonian fluids, TRIBOLOGY INTERNATIONAL, Vol: 67, Pages: 61-71, ISSN: 0301-679X
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- Citations: 64
Accardi MA, McCullen SD, Callanan A, et al., 2013, Effects of fiber orientation on the frictional properties and damage of regenerative articular cartilage surfaces, Tissue Engineering: Parts A, B, and C, Vol: 19, Pages: 2300-2310, ISSN: 1937-3368
Articular cartilage provides a low-friction, wear-resistant surface for diarthrodial joints. Due to overloading and overuse, articular cartilage is known to undergo significant wear and degeneration potentially resulting in osteoarthritis (OA). Regenerative medicine strategies offer a promising solution for the treatment of articular cartilage defects and potentially localized early OA. Such strategies rely on the development of materials to restore some aspects of cartilage. In this study, microfibrous poly(ɛ-caprolactone) scaffolds of varying fiber orientations (random and aligned) were cultured with bovine chondrocytes for 4 weeks in vitro, and the mechanical and frictional properties were evaluated. Mechanical properties were quantified using unconfined compression and tensile testing techniques. Frictional properties were investigated at physiological compressive strains occurring in native articular cartilage. Scaffolds were sheared along the fiber direction, perpendicular to the fiber direction and in random orientation. The evolution of damage as a result of shear was evaluated via white light interferometry and scanning electron microscopy. As expected, the fiber orientation strongly affected the tensile properties as well as the compressive modulus of the scaffolds. Fiber orientation did not significantly affect the equilibrium frictional coefficient, but it was, however, a key factor in dictating the evolution of surface damage on the surface. Scaffolds shear tested perpendicular to the fiber orientation displayed the highest surface damage. Our results suggest that the fiber orientation of the scaffold implanted in the joint could strongly affect its resistance to damage due to shear. Scaffold fiber orientation should thus be carefully considered when using microfibrous scaffolds.
Thaitirarot A, Hills DA, Dini D, 2013, Contact mechanics of frictional lap joints, JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, Vol: 48, Pages: 321-329, ISSN: 0309-3247
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- Citations: 4
Oldfield MJ, Dini D, Jaiswal T, et al., 2013, The significance of rate dependency in blade insertions into a gelatin soft tissue phantom, 1st International Conference on Biotribology (ICoBT), Publisher: ELSEVIER SCI LTD, Pages: 226-234, ISSN: 0301-679X
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- Citations: 20
Cann P, Dini D, 2013, International Conference on Biotribology (ICoBT), TRIBOLOGY INTERNATIONAL, Vol: 63, Pages: 1-1, ISSN: 0301-679X
Gurrutxaga-Lerma B, Balint D, Dini D, et al., 2013, A dynamic discrete dislocation plasticity method for the simulation of plastic relaxation under shock loading, Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, Vol: 469, ISSN: 1364-5021
In this article, it is demonstrated that current methods of modelling plasticity as the collective motion of discrete dislocations, such as two-dimensional discrete dislocation plasticity (DDP), are unsuitable for the simulation of very high strain rate processes (106 s−1 or more) such as plastic relaxation during shock loading. Current DDP models treat dislocations quasi-statically, ignoring the time-dependent nature of the elastic fields of dislocations. It is shown that this assumption introduces unphysical artefacts into the system when simulating plasticity resulting from shock loading. This deficiency can be overcome only by formulating a fully time-dependent elastodynamic description of the elastic fields of discrete dislocations. Building on the work of Markenscoff & Clifton, the fundamental time-dependent solutions for the injection and non-uniform motion of straight edge dislocations are presented. The numerical implementation of these solutions for a single moving dislocation and for two annihilating dislocations in an infinite plane are presented. The application of these solutions in a two-dimensional model of time-dependent plasticity during shock loading is outlined here and will be presented in detail elsewhere.
Medina S, Dini D, 2013, Aspects of modelling adhesion with surface topography, Pages: 184-187
Gattinoni C, Lorenz C, Heyes DM, et al., 2013, NEMD simulations of confined liquids under pressure and shear, Pages: 912-915
Giacopini M, Bertocchi L, Baldini A, et al., 2013, A complementarity formulation for the EHL analysis of a connecting rod big end bearing, Pages: 3499-3502
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- Citations: 4
Balcombe R, Fowell MT, Kadiric A, et al., 2013, Modeling the propagation of Rolling Contact Fatigue (RCF) cracks in the presence of lubricant, Pages: 3577-3579
Strozzi A, Giacopini M, Bertocchi E, et al., 2013, A complementarity formulation of the tangential velocity slip problem in lubricant films, Pages: 3503-3506
Hills DA, Flicek RC, Dini D, 2013, Sharp contact corners, fretting and cracks, Frattura ed Integrita Strutturale, Vol: 7, Pages: 27-35
Contacts with sharp edges subject to oscillatory loading are likely to nucleate cracks from the corners, if the loading is sufficiently severe. To a first approximation, the corners behave like notches, where the local elastic behaviour is relieved by plasticity, and which in turn causes irreversibilities that give rise to crack nucleation, but also by frictional slip. One question we aim to answer here is; when is the frictional slip enveloped by plastic slip, so that the corner is effectively a notch in a monolithic material? We do this by employing the classical Williams asymptotic solution to model the contact corner, and, in doing so, we render the solution completely general in the sense that it is independent of the overall geometry of the components. We then re-define the independent parameters describing the properties of the Williams solution by using the inherent length scale, a procedure that was described at the first IJFatigue and FFEMS joint workshop [1]. By proceeding in this way, we can provide a self-contained solution that can be 'pasted in' to any complete contact problem, and hence the likelihood of crack nucleation, and the circumstances under which it might occur, can be classified. Further, this reformulation of Williams' solution provides a clear means of obtaining the strength (defined by crack nucleation conditions) of a material pair with a particular contact angle. This means that the results from a test carried out using a laboratory specimen may easily be carried over to any complicated contact problem found in engineering practice, and a mechanical test of the prototypical geometry, which may often be quite difficult, is avoided.
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