NDE of FRP Composites Using Acousto-Ultrasonic Technique

  • V. K. Srivastava
Conference paper


The application of FRP composite materials to civil aircraft structures and power plants represents one of the most significant improvement available to engineering in recent time. And the usage of FRP composite materials in various aerospace structures with confidence is possible, only when suitable NDE methods are developed for ultimate performance prediction.

A non-destructive testing, using acousto-ultrasonic (Model AET-206 AU) was used to evaluate the ultimate performance of unidirectional glass fibre reinforced plastic and hybrid glass/carbon fibre reinforced plastic composites. Because, it is the holistic approach of finding out how defects interact with the microstructural environment within the material. For obtaining the relationship between ultimate tensile strength of GRP, hybrid glass/carbon fibre composite and stress wave factor and for obtaining confidence level simple library programme were feed into ICL 1900 computer. Students values of 14.75 of GRP and 9.54 of hybrid glass/carbon fibre composite for the regression coefficient is moderately high, indicating that the coefficient can not be zero. These results help in prediction of the ultimate tensile strength with required degree of confidence. The results indicate that the higher value of stress wave factor correspond to higher the ultimate performance of the FRP composites. And the mode of failure of the GRP and hybrid glass/carbon fibre composites were studied by Zoom microscope for verification of the ultimate performance of composites.


Carbon Fibre Acoustic Emission Glass Fibre Ultimate Tensile Strength Fibre Composite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Chiao, T.T.; Moore, R.L.: Strength retention of s-glass/epoxy composite. 3. of Composite Materials, 6 (1972) 156.ADSCrossRefGoogle Scholar
  2. 2.
    Prevorsek, D.C.: Tensile strength of oriented polymers below the glass transian temperature. J. Polymer Science, H-24 (1966) 63.Google Scholar
  3. 3.
    Hancox, N.L.: The compression strength of unidirectional carbon fibre reinforced plastics. 3. of Material Science, 10 (1973) 234.ADSCrossRefGoogle Scholar
  4. 4.
    Manders, P.W.; Bader, M.G.: The strength of hybrid glass/carbon fibre composite. Part I, J. of Material Science, 16 (1981) 2233.ADSCrossRefGoogle Scholar
  5. 5.
    Vary, A.: Acousto-ultrasonic characterization of fibre reinforced composite. 3. Material Evaluation, 40 (May 1982) 650.Google Scholar
  6. 6.
    Vary, A.; Bowles, K.3.: Ultrasonic evaluation of the strength of unidirectional graphite-polyimide composites. NASA, Lewis Research Centre, Cleveland, Ohio, NASA, TM-X-73646 (April 1977).Google Scholar
  7. 7.
    Vary, A.; Lark, R.F.: Correlation of fibre composite tensile strength with the ultrasonic stress wave factor. J. Testing and Evaluation, 7 (July 1979) 185.CrossRefGoogle Scholar
  8. 8.
    Green, A.T.: Evaluation of composite structures by stress wave factor and acoustic emission. Symposium on Reliability through NDE, Pune, India (1982).Google Scholar
  9. 9.
    Vary, A.; Bowles, K.3.: An ultrasonic-acoustic technique for nondestructive evaluation of fibre composite quality. Polymer Engg. and Science, 19 (1979) 373.CrossRefGoogle Scholar
  10. 10.
    Srivastava, V.K.; Prakash, R.: NDE of hybrid glass/carbon fibre composites using acousto-ultrasonic technique. Proc. National Conference on NDE, Indian Institute of Science, Bangalore (March 1984).Google Scholar

Copyright information

© Springer Japan 1986

Authors and Affiliations

  • V. K. Srivastava
    • 1
  1. 1.Department of Mechanical Engineering, Institute of TechnologyBanaras Hindu UniversityVaranasiIndia

Personalised recommendations