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Related Experiment Videos

In-plane elastic property characterization in composite plates

Lobkis1, Chimenti, Zhang

  • 1Center for Nondestructive Evaluation and Aerospace Engineering and Engineering Mechanics Department, Iowa State University, Ames 50011-3020, USA. lobkis@uiuc.edu

The Journal of the Acoustical Society of America
|May 2, 2000
PubMed
Summary

This study introduces a novel method for measuring the elastic properties of composite plates using ultrasonics. The technique accurately determines directional stiffness, showing strong agreement with theoretical calculations.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-destructive Testing

Background:

  • Accurate characterization of composite plate properties is crucial for structural integrity.
  • Existing methods may lack precision in determining directional elastic properties.
  • Composite materials exhibit significant elastic anisotropy, offering opportunities for advanced measurement techniques.

Purpose of the Study:

  • To present a new method for deducing in-plane elastic properties of multilayered composite plates.
  • To leverage the elastic anisotropy of composites for precise stiffness measurements.
  • To validate the method against established lamination theory.

Main Methods:

  • Adaptation of a synthetic-aperture technique from air-coupled ultrasonics.

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  • Exploitation of material elastic anisotropy for directional stiffness measurement.
  • Experimental validation using uniaxial, biaxial, and quasi-isotropic laminates.

    • Main Results:

    • The method accurately measures directional in-plane stiffness.
    • Experimental results show agreement within several percent for uniaxial/biaxial and 10 percent for quasi-isotropic laminates compared to lamination theory.
    • The technique demonstrates robustness against variations in transducer deployment angle.

    Conclusions:

    • The developed ultrasonic method provides accurate in-plane elastic property determination for composite plates.
    • The technique is reliable across different laminate types and relatively insensitive to transducer positioning.
    • This method offers a valuable tool for materials characterization and quality control in composite manufacturing.