Результаты поиска по 'fracture criterion':
Найдено статей: 2
  1. Golubev G.S., Kargin M.A., Nasedkin A.V., Rodin M.B.
    Computer analysis of the bone regeneration strength in a model system of osteosynthesis by the Ilizarov fixator with static loads
    Computer Research and Modeling, 2014, v. 6, no. 3, pp. 427-440

    The adequate complexity three-dimensional finite element model of biomechanical system with space, shell and beam-type elements was built. The model includes the Ilizarov fixator and tibial bone’s simulator with the regenerating tissue at the fracture location. The proposed model allows us to specify the orthotropic elastic properties of tibial bone model in cortical and trabecular zones. It is also possible to change the basic geometrical and mechanical characteristics of biomechanical system, change the finite element mash density and define the different external loads, such as pressure on the bone and compression or distraction between the repositioned rings of Ilizarov device.

    By using special APDL ANSYS program macros the mode of deformation was calculated in the fracture zone for various static loads on the simulator bone, for compression or distraction between the repositioned rings and for various mechanical properties during different stages of the bone regenerate formation (gelatinous, cartilaginous, trabecular and cortical bone remodeling). The obtained results allow us to estimate the permissible values of the external pressure on the bone and of the displacements of the Ilizarov fixator rings for different stages of the bone regeneration, based on the admittance criterion for the maximum of the stresses in the callus. The presented data can be used in a clinical condition for planning, realization and monitoring of the power modes for transosseous osteosynthesis with the external Ilizarov fixator.

    Keywords: shinbone, Ilizarov external fixator, transosseous osteosynthesis, callus, finite element method, deflected mode, strength.
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  2. Nikitin I.S., Nikitin A.D.
    Multi regime model and numerical algorithm for calculations on various types quasi crack developing under cyclic loading
    Computer Research and Modeling, 2022, v. 14, no. 4, pp. 873-885

    A new method for calculating the initiation and development of narrow local damage zones in specimens and structural elements subjected to various modes cyclic loadings is proposed based on multi regime two criteria model of fatigue fracture. Such narrow zones of damage can be considered as quasi-cracks of two different types, corresponding to the mechanism of normal crack opening and shear.

    Numerical simulations that are aimed to reproduce the left and right branches of the full fatigue curves for specimens made from titanium and aluminum alloy and to verify the model. These branches were constructed based on tests results obtained under various modes and cyclic loading schemes. Examples of modeling the development of quasi-cracks for two types (normal opening and shear) under different cyclic loading modes for a plate with a hole as a stress concentrator are given. Under a complex stress state in the proposed multi regime model, a natural implementation of any considered mechanisms for the quasi-cracks development is possible. Quasi-cracks of different types can develop in different parts of the specimen, including simultaneously.

    Keywords: fatigue fracture, high cycle fatigue, very high cycle fatigue, multi regime model, damage equation, fracture criterion, quasi crack.

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