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Aging of Material

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Oleksiy Larin – One of the best experts on this subject based on the ideXlab platform.

  • Reliability of the Rubber Tube of Automotive Hydraulic Braking System Under Fatigue Failures Considering Random Variation of Load and the Process of Aging of Material
    Journal of Solid Mechanics, 2019
    Co-Authors: Oleksiy Larin, K Potopalska, R Mygushchenko
    Abstract:

    This paper presents the approach for the assessing of the operational reliability of a multi-layer thick-walled tube made of rubber with textile reinforcement. The analysis of the fatigue accumulation process is carried out within the framework of the concept of the continuum mechanics of damage. The mathematical model, which takes into account the accumulation of damages in case of a random spread of the strength characteristics of the Material, as well as the process of stochastic Aging for the elastomeric matrix of the composite and possible random variation of the workload has been developed. In this case, the Aging process is modelled as a reduction of the endurance limit of the Material. In this paper, the mean equivalent strains of the tube and their possible statistical variation in operation have been investigated on the basis of the finite element method. To solve the above problems, a submodeling method has been employed in this work. The probability of non-failure operation of the tube has been determined using the methods and models proposed. The influence of the rate of the Aging process on the life-time of the tube has been estimated.

  • a probability approach to the estimation of the process of accumulation of the high cycle fatigue damage considering the natural Aging of a Material
    International Journal of Damage Mechanics, 2015
    Co-Authors: Oleksiy Larin, Oleksii Vodka
    Abstract:

    This work deals with the development of a new approach to a high-cycle fatigue lifetime prediction, which is made in the stochastic framework and allows taking into account the natural degradation (Aging) of Material properties. Degradation of properties has been modeled as a process of the reduction of fatigue (endurance) limit. Kinetics of damage accumulation is introduced in the context of the effective stress concept. Mathematical expectation, correlation function and the continuum damage parameter variance have been obtained as functions of time. Analysis of the influence of natural Aging process on statistical parameters of damage accumulation as well as on the lifetime has been carried out.

Oleksii Vodka – One of the best experts on this subject based on the ideXlab platform.

  • a probability approach to the estimation of the process of accumulation of the high cycle fatigue damage considering the natural Aging of a Material
    International Journal of Damage Mechanics, 2015
    Co-Authors: Oleksiy Larin, Oleksii Vodka
    Abstract:

    This work deals with the development of a new approach to a high-cycle fatigue lifetime prediction, which is made in the stochastic framework and allows taking into account the natural degradation (Aging) of Material properties. Degradation of properties has been modeled as a process of the reduction of fatigue (endurance) limit. Kinetics of damage accumulation is introduced in the context of the effective stress concept. Mathematical expectation, correlation function and the continuum damage parameter variance have been obtained as functions of time. Analysis of the influence of natural Aging process on statistical parameters of damage accumulation as well as on the lifetime has been carried out.

R Mygushchenko – One of the best experts on this subject based on the ideXlab platform.

  • Reliability of the Rubber Tube of Automotive Hydraulic Braking System Under Fatigue Failures Considering Random Variation of Load and the Process of Aging of Material
    Journal of Solid Mechanics, 2019
    Co-Authors: Oleksiy Larin, K Potopalska, R Mygushchenko
    Abstract:

    This paper presents the approach for the assessing of the operational reliability of a multi-layer thick-walled tube made of rubber with textile reinforcement. The analysis of the fatigue accumulation process is carried out within the framework of the concept of the continuum mechanics of damage. The mathematical model, which takes into account the accumulation of damages in case of a random spread of the strength characteristics of the Material, as well as the process of stochastic Aging for the elastomeric matrix of the composite and possible random variation of the workload has been developed. In this case, the Aging process is modelled as a reduction of the endurance limit of the Material. In this paper, the mean equivalent strains of the tube and their possible statistical variation in operation have been investigated on the basis of the finite element method. To solve the above problems, a submodeling method has been employed in this work. The probability of non-failure operation of the tube has been determined using the methods and models proposed. The influence of the rate of the Aging process on the life-time of the tube has been estimated.

K Potopalska – One of the best experts on this subject based on the ideXlab platform.

  • Reliability of the Rubber Tube of Automotive Hydraulic Braking System Under Fatigue Failures Considering Random Variation of Load and the Process of Aging of Material
    Journal of Solid Mechanics, 2019
    Co-Authors: Oleksiy Larin, K Potopalska, R Mygushchenko
    Abstract:

    This paper presents the approach for the assessing of the operational reliability of a multi-layer thick-walled tube made of rubber with textile reinforcement. The analysis of the fatigue accumulation process is carried out within the framework of the concept of the continuum mechanics of damage. The mathematical model, which takes into account the accumulation of damages in case of a random spread of the strength characteristics of the Material, as well as the process of stochastic Aging for the elastomeric matrix of the composite and possible random variation of the workload has been developed. In this case, the Aging process is modelled as a reduction of the endurance limit of the Material. In this paper, the mean equivalent strains of the tube and their possible statistical variation in operation have been investigated on the basis of the finite element method. To solve the above problems, a submodeling method has been employed in this work. The probability of non-failure operation of the tube has been determined using the methods and models proposed. The influence of the rate of the Aging process on the life-time of the tube has been estimated.

Philippe Colomban – One of the best experts on this subject based on the ideXlab platform.

  • Origins of rapid Aging of Ba-based proton conducting perovskites
    MRS Online Proceedings Library, 2011
    Co-Authors: Aneta Slodczyk, Bogdan Dabrowski, Natalie Malikova, Philippe Colomban
    Abstract:

    Proton conducting ceramics are considered as promising membranes for medium temperature fuel cells, water stream electrolyzers and CO_2/syngas converters. Materials for these applications have to be mechanically and chemically stable at corrosive conditions of temperature and water vapor pressure in order to ensure the long life-time operation. Our comprehensive Raman, infrared, thermogravimetric, thermal expansion and neutron diffraction studies have shown that the choice of A and B elements as well as the Material processing (synthesis, geometry, density, etc.) are crucial to control Aging of Material. We will consider an example of BaZr_0.25In_0.75O_3 perovskite to show that several factors such as the carbonation, the traces of secondary AO phases at the grain boundaries as well as the use of samples with highly active surface, i.e. powders or lightly densified ceramics can cause: i) preferential adsorption of surface protonic species such as hydroxides, (hydro)carbonates, water, ii) decreased incorporation of bulk protonic species responsible for the proton conduction, iii) significant modification of the host perovskite structure up to complete crumbling of the Material. We will show how to improve potential application of perovskites by understanding and controlling these processes.