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Author: Popov Al.

  • MATHEMATICAL MODELLING OF TECHNOLOGICAL PROCESSES AND SYSTEMS

    A INVERSE PROBLEM IN ULTRASONIC TESTING AND MECHANICAL PROPERTIES OF POLYCRYSTALLINE MATERIALS

    • Popov Al.
    • Dobrev G.
    Mathematical Modeling, Vol. 2 (2018), Issue 1, pg(s) 26-27
    • Abstract
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    The direct problem in ultrasonic testing (UT) is: “Evaluation of attenuation coefficient by means velocity of ultrasonic wave propagation, frequency and grain size in polycrystalline materials”. The inverse problem in UT is formulate as “Non-destructive evaluation of grain size by measurement of acoustical characteristics”. The values of acoustical characteristics (V V f ) L T L ; ;α ; are measured, according ASTM E 494:2015. In this article a equation for grain size (D) is derived.

  • BOUSINESQ’S PROBLAM IN THEORY OF ELASTICITY AND ULTRASONIC

    • Popov Al.
    Machines. Technologies. Materials., Vol. 9 (2015), Issue 11, pg(s) 36-38
    • Abstract
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    The evaluation of yield stress -σS is frequently encounter in material testing. In this method there is necessity of manufacture of test-tube from tested material or detail and made tension test. There is destructive method. For many details there is not acceptable. In material testing there is interest to non-destructive evaluation of yield stress σS for the materials and details. In this paper is lock at possibility for non-destructive evaluation of yield stress σS by means measure Brinel’s hardness – HB or velocities of propagation of longitudinal and transversal ultrasonic waves – VL and VT in tested materials and details.

  • EVALUATION OF FATIGUE LIMIT FOR ALUMINIUM ALLOYS BY ULTRASONIC MEASURING

    • Dobrev G.
    • Popov Al.
    Materials Science. Non-Equilibrium Phase Transformations., Vol. 2 (2016), Issue 2, pg(s) 30-32
    • Abstract
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    The evaluation of fatigue limit-σ−1 for AlSi7Mg, AlCu6Mn aluminum alloys is frequently encounter in material testing. In this method there is necessity of manufacture of test-tube from tested material or detail and made tension test.. There is destructive method. For many details there is not acceptable. Calculated in the usual ways fatigue limit appear only their statistical averaging between a number of structural factors indicating the influence. In material testing there is interest to non-destructive evaluation of fatigue limit σ−1 for the specimens and details. In this paper is lock at possibility for non-destructive evaluation of fatigue limit σ−1 by means measure velocities of propagation of longitudinal and transversal ultrasonic waves – VL and VT in tested materials and details.

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