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This study examines the role of an adhesively joined piezoelectric actuator in reducing crack propagation rate in an arc-shaped edge-cracked specimen while exposed to fatigue loading. This study employs the linear elastic fracture mechanics (LEFM) concept to determine the mode-I stress intensity factor (SIF) for maximum and minimum tensile stresses applied on the cracked specimen. The weight function method (WFM) determines the Mode-I SIF under actuation alone. On the other hand, the total SIF is obtained by applying the superposition principle of LEFM. The cracked structure's fatigue crack growth rate (FCGR) before and after repair is determined using the Paris model, considering a stress ratio (SR) of 0.1. The investigation of various cracked structure geometries demonstrates a substantial reduction in FCGR when external voltages are applied, significantly improving fatigue life. A 55.22% reduced FCGR and a 130% enhanced fatigue life are achieved under a repair voltage of 500 V compared to without a repair condition. Notably, since the geometric characteristics of both components are crucial in preventing crack propagation, careful selection of the specimen's geometry and the piezoelectric actuator can significantly extend service life.

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Study on Fatigue Crack Propagation Reduction and Extended Service Life in an Arc-Shaped Cracked Specimen Using Piezoelectric Patch

  • 会议论文

  • 发表日期：

    2025年

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  • Sourav Pattanayak,
  • Goutam Pohit

摘要

This study examines the role of an adhesively joined piezoelectric actuator in reducing crack propagation rate in an arc-shaped edge-cracked specimen while exposed to fatigue loading. This study employs the linear elastic fracture mechanics (LEFM) concept to determine the mode-I stress intensity factor (SIF) for maximum and minimum tensile stresses applied on the cracked specimen. The weight function method (WFM) determines the Mode-I SIF under actuation alone. On the other hand, the total SIF is obtained by applying the superposition principle of LEFM. The cracked structure's fatigue crack growth rate (FCGR) before and after repair is determined using the Paris model, considering a stress ratio (SR) of 0.1. The investigation of various cracked structure geometries demonstrates a substantial reduction in FCGR when external voltages are applied, significantly improving fatigue life. A 55.22% reduced FCGR and a 130% enhanced fatigue life are achieved under a repair voltage of 500 V compared to without a repair condition. Notably, since the geometric characteristics of both components are crucial in preventing crack propagation, careful selection of the specimen's geometry and the piezoelectric actuator can significantly extend service life.