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<p>A&#xa0;complex method of applying acoustic emission (AE) and the previously developed energy approach to determine the residual life of thin-walled structural elements under conditions of long-term static load, corrosive environment effect, and operational degradation of materials is developed. The method is based on the first law of thermodynamics of the balance of energy components and the work of external forces, as well as their rates of change for an elementary jump of crack propagation. The hypothesis of a&#xa0;linear relationship between the dimensions of the area of the active crack and the number of acoustic emission pulses released at the same time is assumed. The change in the characteristics of the oil and gas pipeline material during its operational degradation is mathematically modeled by a&#xa0;linear time dependence. The above-formulated problem of determining the residual life of a&#xa0;thin-walled structural element was solved using the energy approach and was reduced to a&#xa0;differential equation with initial and final conditions. In the mathematical problem obtained in this way, two parameters are unknown: the size of the initial plane crack and the loading parameter of the material near it. These parameters were determined as follows. With the help of the AE device during the given time (150 h), the number of AE pulses and the rate of their counting were recorded. These values were introduced into the established formulas for determining the area of the initial crack and the parameter of loading of the material in its vicinity. To demonstrate the application of this complex method, a&#xa0;numerical experiment was performed, and the residual life of an X70 steel plate was determined.</p>

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Complex application of the acoustic emission method and energy approach to determine the residual life of a structural element under long-term static load, corrosion, and material degradation

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • O. Ye. Andreikiv,
  • I. Ya. Dolinska,
  • M. O. Liubchak

摘要

A complex method of applying acoustic emission (AE) and the previously developed energy approach to determine the residual life of thin-walled structural elements under conditions of long-term static load, corrosive environment effect, and operational degradation of materials is developed. The method is based on the first law of thermodynamics of the balance of energy components and the work of external forces, as well as their rates of change for an elementary jump of crack propagation. The hypothesis of a linear relationship between the dimensions of the area of the active crack and the number of acoustic emission pulses released at the same time is assumed. The change in the characteristics of the oil and gas pipeline material during its operational degradation is mathematically modeled by a linear time dependence. The above-formulated problem of determining the residual life of a thin-walled structural element was solved using the energy approach and was reduced to a differential equation with initial and final conditions. In the mathematical problem obtained in this way, two parameters are unknown: the size of the initial plane crack and the loading parameter of the material near it. These parameters were determined as follows. With the help of the AE device during the given time (150 h), the number of AE pulses and the rate of their counting were recorded. These values were introduced into the established formulas for determining the area of the initial crack and the parameter of loading of the material in its vicinity. To demonstrate the application of this complex method, a numerical experiment was performed, and the residual life of an X70 steel plate was determined.