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    Wyświetlanie 1-7 z 7
    Tytuł:
    Numerical prediction of the effects of miniature channel shaped scratches on the fracture behaviour of wires for civil engineering applications using finite element analysis
    Autorzy:
    Adewole, K. K.
    Bull, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/231418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drut
    analiza awarii
    analiza elementów skończonych
    pękanie
    zarysowanie
    wire
    failure analysis
    finite element analysis
    fracture analysis
    scratch
    Opis:
    The effects of the miniature channel-shaped scratches not detectable by the present inline electromagnetic defect detection system employed for wires’ surface defect detection on the fracture behaviour of the wires for civil engineering applications were investigated numerically. Finite element analysis revealed that both miniature channel-shaped across-the-thickness and across-the-width scratches change the fracture behaviour of the wires in terms of the fracture initiation locations and fracture process sequence. However, miniature across-the-thickness scratches does not affect the fracture shape of the wire while miniature across-the-width scratches changed the wires’ cup and cone fracture to a fracture shape with a predominantly flat fracture. These results provide an understanding of the fracture behaviour of wires with miniature scratches and serve as an alternative or a complimentary tools to experimental or fractographic failure analysis of wires with miniatures scratches which are difficult to carry out in the laboratory due to the sizes of the scratches.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 2; 181-194
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fixation of distal fibular fractures: A biomechanical study of plate fixation techniques
    Autorzy:
    Marvan, J.
    Horak, Z.
    Vilimek, M.
    Horny, L.
    Kachlik, D.
    Baca, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/306556.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza FEM
    osteosynteza
    złamanie kości
    fibular fracture
    finite element analysis
    osteosynthesis
    fracture fixation
    fibula
    Opis:
    Ankle fractures are complex injuries with variable prognoses that depend upon many factors. The aim of the treatment is to restore the ankle joint biomechanical stability with maximum range of motion. Most ankle fractures are fibular fractures, which have a typical oblique fracture line in the distal fibula located in the area of the tibiofibular syndesmosis. The aim of this study was to simulate numerically several fixation techniques of the distal fibular fractures, evaluate their stability, determine their impact on surrounding tissue load, and correlate the results to clinical treatment experience. The following three models of fibular fracture fixation were used: (a) plate fixation with three screws attached above/below and lag screws, (b) plate fixation with two screws attached above/below and lag screws, and (c) three lag screws only. All three fracture fixation models were analyzed according to their use in both healthy physiological bone and osteoporotic bone tissue. Based on the results of Finite Element Analysis for these simulations, we found that the most appropriate fixation method for Weber-B1 fibular fractures was an unlocked plate fixation using six screws and lag screws, both in patients with physiological and osteoporotic bone tissue. Conversely, the least appropriate fixation method was an unlocked plate fixation with four screws and lag screws. Although this fixation method reduces the stress on patients during surgery, it greatly increased loading on the bone and, thus, the risk of fixation failure. The final fixation model with three lag screws only was found to be appropriate only for very limited indications.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 33-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite Element Analysis Of Adolescent Mandible Fracture Occurring During Accidents
    Autorzy:
    Żmudzki, J.
    Chladek, G.
    Panek, K.
    Lipiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352291.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mandible fracture
    disocclusion state
    finite element analysis
    critical blow force
    Opis:
    The paper aims was assessing risks of mandible fractures consequent to impacts or sport accidents. The role of the structural stiffness of mandible, related to disocclusion state, was evaluated using the finite element method. It has been assumed, that the quasi-static stress field, due to distributed forces developed during accidents, could explain the common types of mandibular fractures. Mandibular condyles were supposed jammed in the maxillary fossae. The force of 700 N, simulating an impact on mandible, has been sequentially applied in three distinct areas: centrally, at canine zone and at the mandibular angle. Clinically most frequent fractures of mandible were recognized through the analysis of maximal principal stress/strain fields. It has been shown that mandibular fracture during accidents can be analyzed at satisfactory level using linear quasi-static models for designing protections.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 65-72
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling S235JRG2 steel load-carrying capacity and micro-damage development for static and quasi-static loads
    Autorzy:
    Wcislik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/115933.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    steel structures
    ductile fracture
    porous metal plasticity
    complex stress state
    finite element analysis
    Opis:
    This paper deals with the analysis of plastic deformation and damage development in S235JRG2 steel in complex stress states and at different rates of loading. The material Gurson Tvergaard Needleman (GTN) model was applied. The analysis was performed for notched bars subjected to tension. An attempt was made to investigate the impact of load conditions on the value of critical void volume fraction (fc) in the GTN model. Numerical computations carried out with the use of GTN model made it possible to identify the sites of ductile fracture initiation.
    Źródło:
    Challenges of Modern Technology; 2011, 2, 3; 58-61
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical comparison of a transiliac internal fixator and two iliosacral screws in transforaminal sacral fractures: a finite element analysis
    Autorzy:
    Salasek, M.
    Jansova, M.
    Křen, J.
    Pavelka, T.
    Weisova, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/306399.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza MES
    stabilizator
    biomechanika
    finite element analysis
    transiliac internal fixator
    iliosacral screw
    pelvic ring
    transforaminal fracture
    Opis:
    Purpose: Vertically unstable sacral transforaminal fractures can be stabilized with a transiliac internal fixator (TIFI) or two iliosacral screws (IS). This study was designed to compare stiffness between TIFI and IS. Methods: Using CT images finite element model of the pelvis was developed. Denis II type fracture was simulated and fixed either with TIFI or two IS. The sacral base was loaded vertically (250–500 N), displacement magnitudes on medial and lateral fracture surface and the maximum bone stress were calculated. The intact pelvis was used as a reference. Stiffness was determined by linear regression of load and displacement, computed stiffness ratio %. The von Mises stress was expressed as % ratio, evaluation of colour mapping was made. Results: The mean stiffness ratio medially in TIFI was 75.22%, in IS 46.54% ( p = 0.00005), laterally in TIFI 57.88%, in IS 44.74% ( p = 0.03996). The von Mises stress ratio of TIFI was 139.27%, of IS 565.35% ( p < 0.00001). Conclusions: Significantly higher stiffness and lower stress were found in TIFI model. TIFI provides a lower risk of over-compression of the fracture line in comparison with IS. TIFI thus exhibits superiority for fixation of transforaminal fractures, particularly with comminutive zone.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 1; 39-49
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of mechanical behavior of cracked cruciform specimens in aluminum alloy 6082-T6 subjected to different biaxial loading conditions
    Autorzy:
    Khelil, Foudil
    Aour, Benaoumeur
    Talha, Abderrahim
    Benseddiq, Noureddine
    Powiązania:
    https://bibliotekanauki.pl/articles/281224.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    fracture mechanics
    6082-T6 aluminum alloy
    cruciform specimen
    finite element analysis
    stress intensity factor
    T-stress
    biaxiality
    Opis:
    Analysis of cracked cruciform specimens under biaxial loading conditions is very important and closer to reality in the study of behavior of marine, naval, aeronautical and railway structures. The aim of this work is to examine the evolution of fracture parameters in a combined mixed mode of an aluminum alloy A6082-T6 cruciform specimen as a function of the biaxial loading with different ratios. To this end, the effects of main parameters, such as load ratio, crack length, crack orientation and non-proportional loading coefficient have been analyzed and discussed in order to highlight fracture toughness of the studied material. The results show that the finite element method is a useful tool for calculation of crack characteristics in the mechanics of biaxial fracture. According to the obtained results, a non-proportional evolution of the fracture parameters, namely, the SIFs KI and KII , T-stress, and the biaxiality parameter was observed. Indeed, the latter depends considerably on the crack length, the angle of crack orientation and the applied biaxial loading. Detailed concluding remarks are presented at the end of this work.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1021-1037
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element analysis of mini-plate stabilization of human mandible angle fracture – a comparative study
    Autorzy:
    Wądołowski, Piotr
    Krzesiński, Grzegorz
    Gutowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27324127.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    finite element analysis
    maxillofacial surgery
    mandibular angle fracture
    miniplate osteosynthesis
    contact mechanics
    analiza elementów skończonych
    chirurgia szczękowo-twarzowa
    złamanie kąta żuchwy
    osteosynteza minipłytkowa
    mechanika kontaktowa
    Opis:
    Purpose: The purpose of this study was to analyze three patterns of mandible angle fracture treatment by means of the finite element analysis. Methods: Investigation has been based on the mandible geometry reconstructed with use of hospitalized patient CT data. The KLS Martin mini-plates with corresponding screws were used to establish proper fracture stabilization. Models were run assuming isotropic and elasto-plastic material properties of connecting devices and cortical bone. The main masticatory muscles and artificial temporomandibular joint have been incorporated to assure mandible physiological movement. The gage loading has been applied in three different locations to cover wider range of possible mastication loading cases during daily routine. A different contact conditions have been applied to the fracture plane to simulate both load bearing and sharing behaviors. Prepared FEM models reflect the most frequently used surgery’s approaches to mandible angle fracture treatment. A specific nomenclature has been introduced to describe particular model. The tension plate, with one connecting mini-plate, two-point fixation and combined fixation, both using two mini-plates respectively. Results: Performed analysis allowed for a detailed estimation of the mini-plate connection response under the applied gauge loading. The equivalent stress within the mini-plates and surrounding cortical bone have been compared between all models. Regarding the fracture plane, the contact status and pressure have been considered. Conclusions: The combined fixation model, acting as a biplanar fastener system, presents the highest flexibility and connection efficiency.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 3; 105--116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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