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Prediction of stress intensity factor range for API 5L grade X65 steel by using GPR and MPMR

  • Murthy, A. Ramachandra (Fatigue & Fracture Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Vishnuvardhan, S. (Fatigue & Fracture Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Saravanan, M. (Fatigue & Fracture Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Gandhi, P. (Fatigue & Fracture Laboratory, CSIR-Structural Engineering Research Centre)
  • 투고 : 2020.05.29
  • 심사 : 2021.12.07
  • 발행 : 2022.03.10

초록

The infrastructures such as offshore, bridges, power plant, oil and gas piping and aircraft operate in a harsh environment during their service life. Structural integrity of engineering components used in these industries is paramount for the reliability and economics of operation. Two regression models based on the concept of Gaussian process regression (GPR) and Minimax probability machine regression (MPMR) were developed to predict stress intensity factor range (𝚫K). Both GPR and MPMR are in the frame work of probability distribution. Models were developed by using the fatigue crack growth data in MATLAB by appropriately modifying the tools. Fatigue crack growth experiments were carried out on Eccentrically-loaded Single Edge notch Tension (ESE(T)) specimens made of API 5L X65 Grade steel in inert and corrosive environments (2.0% and 3.5% NaCl). The experiments were carried out under constant amplitude cyclic loading with a stress ratio of 0.1 and 5.0 Hz frequency (inert environment), 0.5 Hz frequency (corrosive environment). Crack growth rate (da/dN) and stress intensity factor range (𝚫K) values were evaluated at incremental values of loading cycle and crack length. About 70 to 75% of the data has been used for training and the remaining for validation of the models. It is observed that the predicted SIF range is in good agreement with the corresponding experimental observations. Further, the performance of the models was assessed with several statistical parameters, namely, Root Mean Square Error (RMSE), Mean Absolute Error (MAE), Coefficient of Efficiency (E), Root Mean Square Error to Observation's Standard Deviation Ratio (RSR), Normalized Mean Bias Error (NMBE), Performance Index (ρ) and Variance Account Factor (VAF).

키워드

과제정보

The authors thank the Director and Advisor (Management), CSIR-SERC, Chennai for the constant support and encouragement extended to them in their R&D activities. The assistance rendered by the technical staff of the Fatigue & Fracture Laboratory, CSIR-SERC in conducting the experimental investigations is gratefully acknowledged. This paper is published with the kind permission of the Director, CSIR-SERC, Chennai.

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