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• Journal article
  Bodnarchuk MS, Heyes DM, Dini D, Chahine S, Edwards Set al., 2014,
  , JOURNAL OF CHEMICAL THEORY AND COMPUTATION, Vol: 10, Pages: 2537-2545, ISSN: 1549-9618
  • Cite
  • Citations: 14
• Journal article
  Hernandez Battez A, Viesca JL, Gonzalez R, Garcia A, Reddyhoff T, Higuera-Garrido Aet al., 2014,
  , TRIBOLOGY TRANSACTIONS, Vol: 57, Pages: 489-495, ISSN: 1040-2004
  • Cite
  • Citations: 22
• Journal article
  Fowell M, Ioannides S, Kadiric A, 2014,
  , Tribology Transactions, Vol: 57, Pages: 472-488, ISSN: 1547-397X

  The onset of smearing damage was studied under controlled conditions in a custom test rig that simulates the passage of a rolling element through loaded and unloaded zones of a rolling bearing. The setup includes a spherical roller that is intermittently loaded between two bearing raceways driven at a prescribed speed. The roller is free to accelerate during the loading phase. Contact load, roller speed and acceleration, and electrical contact resistance are recorded during the test. Contact shear stress, friction coefficient, frictional power intensity, and elastohydrodynamic film thickness are calculated from the recorded kinematics data. Results suggest that the first onset of smearing occurs early in the loading phase where the roller is near stationary and the frictional power intensity is high. The raceway speed at the onset of damage decreases with increasing load and increasing lubricant supply temperature. The maximum frictional power intensity is found to be relatively constant at all contact conditions that led to smearing. An existing thermomechanical contact model is used to estimate the contact temperature distribution under smearing conditions and the potential for elastohydrodynamic lubrication (EHL) film thickness reduction due to forward heat conduction.

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• Journal article
  Steele JAM, McCullen SD, Callanan A, Autefage H, Accardi MA, Dini D, Stevens MMet al., 2014,
  , ACTA BIOMATERIALIA, Vol: 10, Pages: 2065-2075, ISSN: 1742-7061
  • Cite
  • Citations: 113
• Journal article
  Parkes M, Myant C, Cann PM, Wong JSSet al., 2014,
  , Tribology International, Vol: 72, Pages: 108-117, ISSN: 0301-679X
  • Cite
• Journal article
  Hills DA, Dini D, 2014,
  , INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, Vol: 81, Pages: 73-76, ISSN: 0020-7403
  • Cite
  • Citations: 4
• Journal article
  Kolekar AS, Olver AV, Sworski AE, Lockwood FEet al., 2014,
  , JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME, Vol: 136, ISSN: 0742-4787
  • Cite
  • Citations: 15
• Journal article
  Ponjavic A, di Mare L, Wong J, 2014,
  , Journal of Polymer Science Part B: Polymer Physics, Vol: 52, Pages: 708-715, ISSN: 0887-6266

  The rheology of submicron thick polymer melt is examined under high normal pressure conditions by a recently developed photobleached‐fluorescence imaging velocimetry technique. In particular, the validity and limitation of Reynold equation solution, which suggests a linear through‐thickness velocity profile, is investigated. Polybutene (PB) is sheared between two surfaces in a point contact. The results presented in this work suggest the existence of a critical pressure below which the through‐thickness velocity profile is close to linear. At higher pressures however, the profile assumes a sigmoidal shape resembling partial plug flow. The departure of the sigmoidal profile from the linear profile increases with pressure, which is indicative of a second‐order phase/glass transition. The nature of the transition is confirmed independently by examining the pressure‐dependent dynamics of PB squeeze films. The critical pressure for flow profile transition varies with molecular weight, which is consistent with the pressure‐induced glass transition of polymer melt.

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• Conference paper
  Christodoulias AI, Olver AV, Kadiric A, Sworski AE, Kolekar A, Lockwood FEet al., 2014,

  The efficiency of a simple spur gearbox - A thermally coupled lubrication model

  , Pages: 81-98

  A thermally coupled efficiency model for a simple dip-lubricated gearbox is presented. The model includes elastohydrodynamic (EHL) friction losses in gear teeth contacts as well as bearing, seal and churning losses. An iterative numerical scheme is used to fully account for the effects of contact temperature, pressure and shear rates on EHL friction. The model is used to predict gearbox efficiency with selected transmission oils whose properties were first obtained experimentally through rolling-sliding tribometer tests under representative contact conditions. Although the gearbox was designed using standard methods against a fixed rating, the model was used to study efficiency over a much wider range of conditions. Results are presented to illustrate the relative contribution of different sources of energy loss and the effect of lubricant properties on the overall gearbox efficiency under varying operating conditions.

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  • Citations: 3
• Conference paper
  Maćkowiak S, Gattinoni C, Heyes DM, Brańka AC, Dini Det al., 2014,

  Boundary-controlled barostats for slab geometries in molecular dynamics simulations

  , Pages: 2712-2715
  • Cite
• Conference paper
  Thaitirarot A, Hills D, Dini D, 2014,

  Contact mechanics of frictional lap joint

  , Pages: 2228-2231
  • Cite
• Conference paper
  Dini D, Mastrandrea LN, Giacopini M, Bertocchi Eet 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
  • Cite
  • Citations: 9
• Journal article
  Hills DA, Flicek RC, Dini D, 2014,
  , PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol: 228, Pages: 123-126, ISSN: 1350-6501
  • Cite
• Conference paper
  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
  • Cite
  • Citations: 1
• Journal article
  Quinchia LA, Delgado MA, Reddyhoff T, Gallegos C, Spikes HAet al., 2014,
  , TRIBOLOGY INTERNATIONAL, Vol: 69, Pages: 110-117, ISSN: 0301-679X
  • Cite
  • Citations: 215
• Book chapter
  Gurrutxaga-Lerma B, Balint DS, Dini D, Eakins DE, Sutton APet al., 2014,
  , ADVANCES IN APPLIED MECHANICS, VOL 47, Editors: Bordas, Publisher: ELSEVIER ACADEMIC PRESS INC, Pages: 93-224, ISBN: 978-0-12-800130-1
  • Cite
  • Citations: 18
• Conference paper
  Roberts O, Lunt AJG, Ying S, Sui T, Baimpas N, Dolbnya IP, Parkes M, Dini D, Kreynin SM, Neo TK, Korsunsky AMet 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.

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• Journal article
  Mattei L, Campioni E, Accardi MA, Dini Det al., 2014,
  , COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING, Vol: 17, ISSN: 1025-5842
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  • Citations: 14
• Journal article
  Heyes DM, Smith ER, Dini D, Zaki TAet al., 2014,
  , The Journal of Chemical Physics, Vol: 140, Pages: ---
  • Cite
• Journal article
  Zhang J, Yamaguchi E, Spikes H, 2014,
  , Tribology Transactions, Vol: 57, Pages: 57-65, ISSN: 1040-2004

  Recent years have seen an increase in the concentration of dispersant present in formulated engine oils, while the concentration of antiwear additives has been progressively reduced. However, it is known that the presence of dispersant can, in some cases, detract from the performance of antiwear additives in lubricant blends. In this article, the influence of three succinimide dispersants on the film formation and wear-reducing properties of a secondary zinc dialkyldithiophosphate (ZDDP) has been studied. Both posttreated and non-post-treated dispersants reduce steady-state ZDDP tribofilm formation to a certain extent depending on the dispersant concentration. At very high dispersant concentrations, ZDDP film formation is suppressed almost entirely. This can be restored only marginally by increasing ZDDP concentration, which implies that the absolute dispersant concentration rather than the dispersant : ZDDP ratio controls the impact of the dispersant on ZDDP film formation.Addition of dispersant to ZDDP also caused an increase in wear rate for all three dispersants tested. For one succinimide reported in detail in this article, it is has been shown that the wear rate increases approximately linearly with dispersant concentration and is largely independent of ZDDP concentration over the P weight percentage range studied.

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• Journal article
  Botta F, Dini D, Schwingshackl C, Di Mare L, Cerri Get al., 2013,
  , 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.

  • Abstract
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• Journal article
  Myant CW, fowell M, cann P, 2013,
  , Tribology International, Vol: 72, Pages: 98-107, ISSN: 1879-2464

  Laser induced fluorescence was employed to measure lubricant film thickness in a compliant, point, contact during transient motion. Two types of transient sliding motion were investigated: start-up and sudden halting. The effects of acceleration rate and sliding speed on film formation and breakdown were studied.A clear relationship between start-up acceleration and the period of the film formation phase was observed. During sudden halting motion entrapment of fluid occurred in the centre of the contact. This trapped fluid was squeezed out of the contact over several seconds. The size of this entrapment was dependent on the initial sliding speed. The findings are compared to similar results for hard, point, contacts and the implications discussed.

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• Conference paper
  Puthumanapully PK, Amis A, Harris S, Cobb J, Jeffers Jet al., 2013,
  , Orthopaedic Proceedings, Publisher: The British Editorial Society of Bone & Joint Surgery, Pages: 89-89, ISSN: 1358-992X

  Introduction:Varus alignment of the knee is common in patients undergoing unicondylar knee replacement. To measure the geometry and morphology of these knees is to know whether a single unicondylar knee implant design is suitable for all patients, i.e. for patients with varus deformity and those without. The aim of this study was to identify any significant differences between normal and varus knees that may influence unicondylar implant design for the latter group.Methodology:56 patients (31 varus, 25 normal) were evaluated through CT imaging. Images were segmented to create 3D models and aligned to a tri-spherical plane (centres of spheres fitted to the femoral head and the medial and lateral flexion facets). 30 key co-ordinates were recorded per specimen to define the important axes, angles and shapes (e.g. spheres to define flexion and extension facet surfaces) that describe the femoral condylar geometry using in-house software. The points were then projected in sagittal, coronal and transverse planes. Standardised distance and angular measurements were then carried out between the points and the differences between the morphology of normal and varus knee summarised. For the varus knee group, trends were investigated that could be related to the magnitude of varus deformity.Results:Several significant differences between normal and varus knees were found, but most of these were small differences unlikely to be clinically significant or have an influence on implant design. However, two strong trends were observed. Firstly, the version of the femoral neck was significantly less for patients with varus knees (mean difference 9°; p < 0.05).The second trend was a significant difference in the sagittal morphology of the medial condyle. The kink angle, the angle formed by the intersection of the circles fitted to the flexion and extension facet surfaces, and their centres (Figure 1) was either absent or small in normal knees (mean 1°). An absent kink angle o

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• Journal article
  Botta F, Marx N, Dini D, de Lieto Vollaro R, Battista Get 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.

  • Abstract
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  • Citations: 4
• Journal article
  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.

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  • Citations: 5
• Journal article
  Veijgen NK, Masen MA, van der Heide E, 2013,
  , JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 28, Pages: 448-461, ISSN: 1751-6161
  • Cite
  • Citations: 32
• Journal article
  Gattinoni C, Heyes DM, Lorenz CD, Dini Det al., 2013,
  , PHYSICAL REVIEW E, Vol: 88, ISSN: 1539-3755
  • Cite
  • Citations: 39
• Journal article
  Yang S, Reddyhoff T, Spikes H, 2013,
  , TRIBOLOGY TRANSACTIONS, Vol: 56, Pages: 1119-1136, ISSN: 1040-2004
  • Cite
  • Citations: 9
• Journal article
  Bertocchi L, Dini D, Giacopini M, Fowell MT, Baldini Aet al., 2013,
  , TRIBOLOGY INTERNATIONAL, Vol: 67, Pages: 61-71, ISSN: 0301-679X
  • Cite
  • Citations: 79
• Journal article
  Rodriguez NV, Masen MA, Schipper DJ, 2013,
  , International Journal of Mechanical Sciences, Vol: 74, Pages: 91-98, ISSN: 0020-7403
  • Cite
• Journal article
  van Kuilenburg J, Masen MA, van der Heide E, 2013,
  , TRIBOLOGY INTERNATIONAL, Vol: 65, Pages: 81-90, ISSN: 0301-679X
  • Cite
  • Citations: 32
• Journal article
  Vengudusamy B, Green JH, Lamb GD, Spikes HAet al., 2013,
  , TRIBOLOGY LETTERS, Vol: 51, Pages: 469-478, ISSN: 1023-8883
  • Cite
  • Citations: 40
• Journal article
  van Arkel RJ, Modenese L, Phillips ATM, Jeffers JRTet al., 2013,
  , JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 31, Pages: 1172-1179, ISSN: 0736-0266
  • Cite
  • Citations: 67
• Journal article
  Veijgen NK, van der Heide E, Masen MA, 2013,
  , SKIN RESEARCH AND TECHNOLOGY, Vol: 19, Pages: 330-338, ISSN: 0909-752X
  • Cite
  • Citations: 24
• Journal article
  Accardi MA, McCullen SD, Callanan A, Chung S, Cann PM, Stevens MM, Dini Det al., 2013,
  , 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.

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• Conference paper
  Oldfield MJ, Dini D, Jaiswal T, Rodriguez y Baena Fet al., 2013,
  , 1st International Conference on Biotribology (ICoBT), Publisher: ELSEVIER SCI LTD, Pages: 226-234, ISSN: 0301-679X
  • Cite
  • Citations: 25
• Journal article
  Cann P, Dini D, 2013,
  , TRIBOLOGY INTERNATIONAL, Vol: 63, Pages: 1-1, ISSN: 0301-679X
  • Cite
• Conference paper
  Myant C, Cann P, 2013,
  , 1st International Conference on Biotribology (ICoBT), Publisher: ELSEVIER SCI LTD, Pages: 97-104, ISSN: 0301-679X
  • Cite
  • Citations: 36
• Journal article
  Thaitirarot A, Hills DA, Dini D, 2013,
  , JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, Vol: 48, Pages: 321-329, ISSN: 0309-3247
  • Cite
  • Citations: 5
• Journal article
  Rodriguez NV, Masen MA, Schipper DJ, 2013,
  , INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, Vol: 72, Pages: 75-79, ISSN: 0020-7403
  • Cite
  • Citations: 8
• Journal article
  Gurrutxaga-Lerma B, Balint D, Dini D, Eakins D, Sutton Aet al., 2013,
  , 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.

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• Journal article
  Van Der Heide E, Zeng X, Masen MA, 2013,
  , FRICTION, Vol: 1, Pages: 130-142, ISSN: 2223-7690
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  • Citations: 35
• Journal article
  Rodriguez NV, Masen MA, Schipper D-J, 2013,
  , PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol: 227, Pages: 398-405, ISSN: 1350-6501
  • Cite
  • Citations: 5
• Journal article
  Moorhouse BS, Reddyhoff T, Ward-Close M, Ryan MP, Shollock BAet al., 2013,
  , SURFACE & COATINGS TECHNOLOGY, Vol: 221, Pages: 214-221, ISSN: 0257-8972
  • Cite
  • Citations: 5
• Journal article
  Ponjavic A, Wong JSS, 2013,
  , RSC Advances, Vol: 4, Pages: 20821-20829, ISSN: 2046-2069
  • Cite
• Journal article
  Hart AJ, Muirhead-Allwood S, Porter M, Matthies A, Ilo K, Maggiore P, Underwood R, Cann P, Cobb J, Skinner JAet al., 2013,
  , JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME, Vol: 95A, Pages: 678-685, ISSN: 0021-9355
  • Cite
  • Citations: 57
• Journal article
  van Kuilenburg J, Masen MA, van der Heide E, 2013,
  , PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol: 227, Pages: 349-361, ISSN: 1350-6501
  • Cite
  • Citations: 99
• Journal article
  Le Rouzic J, Reddyhoff, Tom, 2013,
  , Journal of Tribology, Vol: 135, Pages: 021504-021504, ISSN: 0742-4787
  • Cite
• Journal article
  Ponjavic A, Chennaoui M, Wong JSS, 2013,
  , Tribology Letters

  The through-thickness flow profile of a lubricant within an elastohydrodynamic contact is challenging to obtain due to its small thickness. Yet, this information is crucial to the accurate friction estimation of the tribological system. In this work, a novel fluorescence based technique has been developed to extract such information in situ. The local through-thickness flow profiles map within a tribological contact is obtained for the first time. The profiles obtained are position depends with slip boundary condition observed in high normal stress locations.

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• Journal article
  Kolekar AS, Olver AV, Sworski AE, Lockwood FEet al., 2013,
  , TRIBOLOGY INTERNATIONAL, Vol: 59, Pages: 203-209, ISSN: 0301-679X
  • Cite
  • Citations: 20

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