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Ultrasonic nonlinearity parameter in uniaxial stress condition.

Jongbeom Kim1, Chang-Soo Kim2, Dong-Gi Song2

  • 1Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.

Ultrasonics
|January 18, 2020
PubMed
Summary

This study introduces a new ultrasonic nonlinearity parameter for assessing material degradation. This improved parameter shows a stronger correlation with yield strength under uniaxial stress conditions, enhancing material evaluation accuracy.

Keywords:
AcoustoelasticityAl6061-T6Piezo-electric detection methodThermal agingUltrasonic nonlinearity parameterUniaxial stress condition

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustic Materials

Background:

  • Ultrasonic nonlinearity parameter is used for material degradation assessment.
  • Existing methods correlate this parameter with yield strength under restrained lateral strain.
  • Tensile tests measure yield strength under uniaxial stress with free lateral deformation, creating a mismatch.

Purpose of the Study:

  • To define an ultrasonic nonlinearity parameter under uniaxial stress conditions, matching tensile testing conditions.
  • To improve the accuracy of material degradation evaluation by aligning ultrasonic and mechanical testing states.
  • To investigate the correlation between the proposed parameter and yield strength.

Main Methods:

  • Defined a new ultrasonic nonlinearity parameter accounting for uniaxial stress conditions.
  • Conducted experiments on Al6061-T6 alloy specimens with varying heat treatments.
  • Measured yield strength using tensile tests.
  • Compared the correlation of the proposed parameter with yield strength against the conventional parameter.

Main Results:

  • The proposed ultrasonic nonlinearity parameter demonstrated a higher correlation with yield strength compared to the conventional parameter.
  • Experimental results validated the improved accuracy of the new parameter for Al6061-T6 alloy.
  • The enhanced correlation highlights the importance of matching testing conditions.

Conclusions:

  • The developed ultrasonic nonlinearity parameter under uniaxial stress conditions is a more effective tool for evaluating material degradation.
  • This method offers a more accurate assessment of material properties like yield strength.
  • The findings suggest a revised approach for ultrasonic non-destructive evaluation in materials science.