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  • 1.
    Ciavarella, M.
    et al.
    CEMEC-PoliBA-Ctr.ExcellenceComputat., Politecnico di Bari, V.le Japigia 182, Bari 70125, Italy.
    Johansson, Lars
    Linköping University, Department of Management and Engineering, Mechanics . Linköping University, The Institute of Technology.
    Afferrante, L.
    CEMEC-PoliBA-Ctr.ExcellenceComputat., Politecnico di Bari, V.le Japigia 182, Bari 70125, Italy.
    Klarbring, Anders
    Linköping University, Department of Management and Engineering, Mechanics . Linköping University, The Institute of Technology.
    Barber, J.R.
    Department of Mechanical Engineering, University of Michigan, 2350 Hayward Street, Ann Arbor, MI 48109-2125, United States.
    Interaction of thermal contact resistance and frictional heating in thermoelastic instability2003In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 40, no 21, p. 5583-5597Article in journal (Refereed)
    Abstract [en]

    Thermoelastic contact problems can posess non-unique and/or unstable steady-state solutions if there is frictional heating or if there is a pressure-dependent thermal contact resistance at the interface. These two effects have been extensively studied in isolation, but their possible interaction has never been investigated. In this paper, we consider an idealized problem in which a thermoelastic rod slides against a rigid plane with both frictional heating and a contact resistance. For sufficiently low sliding speeds, the results are qualitatively similar to those with no sliding. In particular, there is always an odd number of steady-state solutions, if the steady-state is unique it is stable and if it is non-unique, stable and unstable solutions alternate, with the outlying solutions being stable. However, we identify a sliding speed V0 above which the number of steady states is always even (including zero, implying possible non-existence of a steady-state) and again stable and unstable states alternate. A parallel numerical study shows that for V > V0 there are some initial conditions from which the contact pressure grows without limit in time, whereas for V < V0 the system will always tend to one of the stable steady states. © 2003 Elsevier Ltd. All rights reserved.

  • 2. F, Pfeiffer
    et al.
    Ch., Glocker
    Johansson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    An Algorithm for Rigid Body Contact with Coulomb Friction2000In: TUTAM Symposium on Unilateral Multibody Dynamics,1999, 2000Conference paper (Other academic)
  • 3.
    Fahlgren, Anna
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine. Linköping University, Faculty of Health Sciences.
    Bostrom, Mathias Pg
    Hospital for Special Surgery, New York, NY, USA.
    Yang, Xu
    Hospital for Special Surgery, New York, NY, USA.
    Johansson, Lars
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Edlund, Ulf
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Agholme, Fredrik
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine. Linköping University, Faculty of Health Sciences.
    Aspenberg, Per
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Orthopaedic Centre, Department of Orthopaedics Linköping.
    Fluid pressure and flow as a cause of bone resorption2010In: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 81, no 4, p. 508-516Article in journal (Refereed)
    Abstract [en]

    Background Unstable implants in bone become surrounded by an osteolytic zone. This is seen around loose screws, for example, but may also contribute to prosthetic loosening. Previous animal studies have shown that such zones can be induced by fluctuations in fluid pressure or flow, caused by implant instability. Method To understand the roles of pressure and flow, we describe the 3-dimensional distribution of osteolytic lesions in response to fluid pressure and flow in a previously reported rat model of aseptic loosening. 50 rats had a piston inserted in the proximal tibia, designed to produce 20 local spikes in fluid pressure of a clinically relevant magnitude (700 mmHg) twice a day. The spikes lasted for about 0.3 seconds. After 2 weeks, the pressure was measured in vivo, and the osteolytic lesions induced were studied using micro-CT scans. Results Most bone resorption occurred at pre-existing cavities within the bone in the periphery around the pressurized region, and not under the piston. This region is likely to have a higher fluid flow and less pressure than the area just beneath the piston. The velocity of fluid flow was estimated to be very high (roughly 20 mm/s). Interpretation The localization of the resorptive lesions suggests that high-velocity fluid flow is important for bone resorption induced by instability.

  • 4.
    Fahlgren, Anna
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Division of Inflammation Medicine. Linköping University, Faculty of Health Sciences.
    Johansson, Lars
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Edlund, Ulf
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Aspenberg, Per
    Linköping University, Department of Clinical and Experimental Medicine, Division of Inflammation Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center for Surgery, Orthopaedics and Cancer Treatment, Department of Orthopaedics in Linköping.
    Direct ex vivo measurement of the fluid permeability of loose scar tissue2012In: Acta of Bioengineering and Biomechanics, ISSN 1509-409X, Vol. 14, no 2, p. 47-51Article in journal (Refereed)
    Abstract [en]

    Fluid flow is important in many biomechanical models, but there is a lack of experimental data that quantifies soft tissue permeability. We measured the tissue permeability in fibrous soft tissue, using a novel technique to obtain specimens by allowing soft tissue to grow into coralline hydroxyapatite scaffoldings implanted between the abdominal muscle layers of rats.

  • 5.
    Johansson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    A flight dynamics course based on MTLAB computer assignme2001Other (Other (popular science, discussion, etc.))
    Abstract [en]

        

  • 6.
    Johansson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Mechanics .
    A Newton method for rigid body frictional impact with multiple simultaneous impact points2001In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 191, no 3-5, p. 239-254Article in journal (Refereed)
    Abstract [en]

    In this paper a mathematical formulation and a numerical algorithm for the analysis of frictional impact of rigid bodies with multiple simultaneous contact points are developed. A direct approach is used where the impenetrability condition and Coulomb's law of friction are formulated as equations, which are not differentiable in the usual sense, and solved together with the equations of motion and necessary kinematical relations using Newton's method. An experiment has also been performed where a possible mechanism for the difference between static and dynamic friction is observed and results are compared with computations using the present algorithm. (C) 2001 Elsevier Science B.V. All rights reserved.

  • 7.
    Johansson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Mechanics .
    A note on the computation of the Euler parameters2001In: Journal of Dynamic Systems Measurement, and Control, ISSN 0022-0434, E-ISSN 1528-9028, Vol. 123, no 4, p. 719-722Article in journal (Refereed)
    Abstract [en]

    This paper is concerned with the integration of the differential equations for the Euler parameters, for the purpose of describing the orientation of a rigid body. This can be done using standard methods, but in some cases, such as in the presence of impulsive forces, the angular velocities are not continuous and methods based on high order continuity are not appropriate. In this paper the use of the closed-form solution for piecewise constant angular velocity as the basis for a computational algorithm is studied. It is seen that if this solution is implemented in a leapfrog manner a method with second-order accuracy is obtained in the smooth case, while this method also makes sense in the discontinuous case.

  • 8.
    Johansson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Privatlärare drev fram mattesnillen2004In: Svenska dagbladet, ISSN 1101-2412, no 2 november, p. 63-63Article in journal (Other (popular science, discussion, etc.))
  • 9.
    Johansson, Lars
    et al.
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Edlund, Ulf
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Fahlgren, Anna
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Orthopaedics and Sports Medicine.
    Aspenberg, Per
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Orthopaedics and Sports Medicine. Östergötlands Läns Landsting, Orthopaedic Centre, Department of Orthopaedics Linköping.
    A model for bone resorption2006In: ESDA 2006, 8th Biennial ASME Conference on Engineering Systems Design and Analysis,2006, ASME Press, 2006, p. 487-495Conference paper (Refereed)
  • 10.
    Johansson, Lars
    et al.
    Linköping University, Department of Management and Engineering, Mechanics . Linköping University, The Institute of Technology.
    Edlund, Ulf
    Linköping University, Department of Management and Engineering, Mechanics . Linköping University, The Institute of Technology.
    Fahlgren, Anna
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine . Linköping University, Faculty of Health Sciences.
    Aspenberg, Per
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine . Linköping University, Faculty of Health Sciences.
    Bone Resorption Induced by Fluid Flow2009In: Journal of Biomechanical Engineering, ISSN 0148-0731, E-ISSN 1528-8951, Vol. 131, no 9, p. 094505-1-094505-5Article in journal (Refereed)
    Abstract [en]

    A model where bone resorption is driven by stimulus from fluid flow is developed and used as a basis for computer simulations, which are compared with experiments. Models for bone remodeling are usually based on the state of stress, strain, or energy density of the bone tissue as the stimulus for remodeling. We believe that there is experimental support for an additional pathway, where an increase in the amount of osteoclasts, and thus osteolysis, is caused by the time history of fluid flow velocity, fluid pressure, or other parameters related to fluid flow at the bone/soft tissue interface of the porosities in the bone.

  • 11.
    Johansson, Lars
    et al.
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Edlund, Ulf
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Fahlgren, Anna
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics.
    Aspenberg, Per
    Linköping University, Department of Clinical and Experimental Medicine, Orthopaedics and Sports Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Surgery, Orthopaedics and Cancer Treatment, Department of Orthopaedics in Linköping.
    Fluid-induced osteolysis: modelling and experiments2011In: COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING, ISSN 1025-5842, Vol. 14, no 4, p. 305-318Article in journal (Refereed)
    Abstract [en]

    A model to calculate bone resorption driven by fluid flow at the bone-soft tissue interface is developed and used as a basis for computer calculations, which are compared to experiments where bone is subjected to fluid flow in a rat model. Previous models for bone remodelling calculations have been based on the state of stress, strain or energy density of the bone tissue as the stimulus for remodelling. We believe that there is experimental support for an additional pathway where an increase in the amount of the cells directly involved in bone removal, the osteoclasts, is caused by fluid pressure, flow velocity or other parameters related to fluid flow at the bone-soft tissue interface, resulting in bone resorption.

  • 12.
    Johansson, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    A Method for Rigid Body Dynamics Based on B-differentiable Equations1999In: Euromech Colloquim 397 Impact in Numerical Systems,1999, 1999Conference paper (Other academic)
  • 13.
    Lindström, Stefan B
    et al.
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Johansson, Lars
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Karlsson, Nils R.
    Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology.
    Metastable states and activated dynamics in thin-film adhesion to patterned surfaces2014In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 89, p. 062401-1-062401-11Article in journal (Refereed)
    Abstract [en]

    We consider adhesion due to London–van der Waals attraction between a thin film and a patterned surface with nanometer asperities. Depending on the surface topography and the stiffness of the film, three regimes of adhesion are identified: complete contact adhesion, partial contact adhesion, and glassy adhesion. For complete contact adhesion, the film conforms to the undulations of the surface, whereas for partial contact and glassy adhesion, the adhesive interface breaks down into microscopic areas of contact. When a film in the glassy regime is peeled off the surface, metastable states develop at which the crack front becomes arrested, analogously to the frustrated motion of the three-phase contact line across a heterogeneous surface. For this glassy regime, we use transition state theory to model the thermally activated progression of the crack front. This theoretical treatment suggests that the rate of the adhesive failure increases exponentially with the applied force.

1 - 13 of 13
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