Now showing items 1-20 of 46

  • Fracture mechanics parameters of multilayer pipes 

    Malíková, Lucie; Náhlík, Luboš; Hutař, Pavel; Knésl, Zdeněk (University of West Bohemia, 2007-10-19)
    Multilayer pipes consisting of different materials are frequently used in praxis because of partial improvement of the properties of pipe systems. To estimate lifetime of these pipes the basic fracture parameters have to ...
  • Biomechanical Evaluation of the MACSTL Internal Fixator for Thoracic Spinal Stabilisation 

    Veselý, Radek; Florian, Zdeněk; Wendsche, Peter; Tošovský, Jiří (University of Veterinary and Pharmaceutical Sciences in Brno, 2008-03-15)
    Unstable fractures of the thoracic spine in humans represent a serious social and economic issue. They may lead to persistent consequences and chronic disease. The anatomical and biomechanical characteristics of the thoracic ...
  • Crack propagation in the vicinity of the interface in layered materials 

    Malíková, Lucie; Náhlík, Luboš; Hutař, Pavel; Knésl, Zdeněk (University of West Bohemia, 2009-01-04)
    Paper deals with the problem of crack propagation in the vicinity of the interface in layered materials. Layered materials are often used in practice, primarily because of their better mechanical properties in comparison ...
  • Design of pressure sensor based on optical fiber Bragg grating lateral deformation 

    Urban, František; Kadlec, Jaroslav; Vlach, Radek; Kuchta, Radek (MDPI, 2010-12-08)
    This paper describes steps involved in the design and realization of a new type of pressure sensor based on the optical fiber Bragg grating. A traditional pressure sensor has very limited usage in heavy industrial environments, ...
  • Comparison of the Resistance to Bending Forces of the 4.5 LCP Plate-rod Construct and of 4.5 LCP Alone Applied to Segmental Femoral Defects in Miniature Pigs 

    Urbanová, Lucie; Srnec, Robert; Proks, Pavel; Stehlík, Ladislav; Florian, Zdeněk; Návrat, Tomáš; Nečas, Alois (University of Veterinary and Pharmaceutical Sciences in Brno, 2010-12-20)
    The study deals with the determination of mechanical properties, namely resistance to bending forces, of flexible buttress osteosynthesis using two different bone-implant constructs stabilizing experimental segmental femoral ...
  • Computational Modelling of the Unbalanced Magnetic Pull by Finite Element Method 

    Donát, Martin (Elsevier, 2012-11-05)
    This paper presents a process of calculating of the unbalanced magnetic pull in the rotating electrical machines based on the electromagnetic coupled field analysis. The computational model is ...
  • Comparison of Different Load Spectra on Residual Fatigue Lifetime of Railway Axle 

    Pokorný, Pavel; Náhlík, Luboš; Hutař, Pavel (Elsevier, 2014-06-18)
    The railway axles are subjected to variable amplitude loading. The variability is caused by many different regimes of train operation. The dominant load is caused by the weight of the vehicle, which generates rotary bending ...
  • Review of Pressurized Vessel Structural Design – An Assessment of Total Life 

    Vosynek, Petr; Vlk, Miloš; Návrat, Tomáš (Trans Tech Publications, 2014-08-18)
    The paper discusses life prediction of pressurized cylindrical container because of its dangerous failure during usage. The fatigue of material and crack propagation were obvious from the fracture surface. Crack initiation ...
  • Active Elbow Orthosis 

    Ripel, Tomáš; Krejsa, Jiří; Hrbáček, Jan; Čižmář, Igor (InTech Europe, 2014-09-08)
    This paper presents a novel approach to the design of a motorized rehabilitation device – active elbow orthosis (AEO) – inspired by the principles of robotic exoskeletons. The device is currently designed for the elbow ...
  • Critical applied stresses for a crack initiation from a sharp V-notch 

    Náhlík, Luboš; Hutař, Pavel; Štegnerová, Kateřina (Gruppo Italiano Frattura, 2014-10-31)
    The aim of the paper is to estimate a value of the critical applied stress for a crack initiation from a sharp V-notch tip. The classical approach of the linear elastic fracture mechanics (LELM) was generalized, because ...
  • Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading 

    Pokorný, Pavel; Náhlík, Luboš; Hutař, Pavel (Elsevier, 2015-03-20)
    The paper deals with an estimation of residual fatigue lifetime of railway axles under real loading spectrum. The residual fatigue lifetime is given by magnitude of fatigue crack propagation rate. This rate depends ...
  • Biomechanical Testing of Spinal Segment Fixed by Arcofix System on the Swine Spine 

    Kelbl, Martin; Kočiš, Ján; Veselý, Radek; Florian, Zdeněk; Návrat, Tomáš; Vosynek, Petr (Korean Society of Spine Surgery, 2015-07-28)
    To evaluate the mechanical properties of the spinal segment in the intact, injured, and stabilized state after fixation by an Arcofix implant. Several types of thoracolumbar spine injury necessitates anterior instrumentation. ...
  • Estimation of stepwise crack propagation in ceramic laminates with strong interfaces 

    Náhlík, Luboš; Štegnerová, Kateřina; Hutař, Pavel (Gruppo Italiano Frattura, 2015-10-01)
    The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools ...
  • Understanding the edge crack phenomenon in ceramic laminates 

    Ševeček, Oldřich; Kotoul, Michal; Leguillon, Dominique; Martin, Éric; Bermejo, Raul (Gruppo Italiano Frattura, 2015-10-05)
    In this work, a 2D parametric finite element model has been developed to predict the onset and propagation of an edge crack in ceramic laminates using a coupled stress-energy criterion. This approach states that a crack ...
  • Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles 

    Pokorný, Pavel; Náhlík, Luboš; Hutař, Pavel (Elsevier, 2016-01-01)
    Railway axles are subjected to cyclic loading, which could lead to fatigue failure. Therefore, it is desired to know residual fatigue lifetime of railway axles to ensure safe operation of trains. Because of detection of ...
  • A fractographic study of bending/torsion fatigue failure in metallic materials with protective surface layers 

    Slámečka, Karel; Šesták, Petr; Vojtek, Tomáš; Kianicová, Marta; Horníková, Jana; Šandera, Pavel; Pokluda, Jaroslav (Hindawi, 2016-06-10)
    Results are given of a fractographic study of biaxial in-phase bending/torsion fatigue fractures in specimens made of nitrided steel and nickel-based superalloy with protective coatings (diffusion coatings and plasma-sprayed ...
  • Experimental and Computational Evaluation of Rolling Bearing Steel Durability 

    Nohál, Libor; Vaculka, Miroslav (Tanger Ltd., 2016-11-09)
    Rolling element bearings are widely-used machine components and their failure can result in damage to the whole machine. A bearing failure can be caused by many factors. In most cases it is damage on the raceway surface ...
  • Selection of MEMS Accelerometers for Tilt Measurements 

    Grepl, Robert (Hindawi, 2017-03-30)
    In order to build a tilt sensor having a desired sensitivity and measuring range, one should select an appropriate type, orientation, and initial position of an accelerometer. Practical guidelines for an optimal selection ...
  • Finite element analysis of 6 large PMMA skull reconstructions: A multi-criteria evaluation approach 

    Ridwan-Pramana, Angela; Marcián, Petr; Borák, Libor; Narra, Nathaniel; Forouzanfar, Tim; Wolff, Jan (PLOS, 2017-06-13)
    In this study 6 pre-operative designs for PMMA based reconstructions of cranial defects were evaluated for their mechanical robustness using finite element modeling. Clinical experience and engineering principles were ...
  • The Effect of the Free Surface on the Singular Stress Field at the Fatigue Crack Front 

    Oplt, Tomáš; Pokorný, Pavel; Náhlík, Luboš; Hutař, Pavel (De Gruyter Open, 2017-11-22)
    Description of stress singularity in the vicinity of a free surface is presented. Its presence causes the retardation of the fatigue crack growth in that region and fatigue crack is being curved. Numerical model is used ...