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Measuring Triaxial Stresses in Embedded Particles by Diffraction

Published online by Cambridge University Press:  06 March 2019

C. S. Barrett  and
P. K. Predecki
C. S. Barrett
Affiliation:
University of Denver Research Institute, Denver, Colorado
P. K. Predecki
Affiliation:
University of Denver Research Institute, Denver, Colorado
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Extract

The method presented In 1976 for measuring stresses in polymeric materials including fiber-reinforced composites (1,2) yielded directly only one or two of the principal stresses and (elastic) strains in the embedded crystalline particles. The method is now extended so as to yield determinations of all three principal stresses σ1, σ2, σ3 and strains, ε1, ε2, ε3, The method applies to both residual and applied stresses and strains.

High angle diffractometry such as is used in ordinary X-ray stress determinations in metal objects is used, with suitable particles being embedded in a homogeneous plastic or reinforced composite before curing.

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Note
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Advances in X-Ray Analysis , Volume 21: Twenty-Sixth Annual Conference on Applications of X-ray Analysis, August 3-5, 1977 , 1977 , pp. 305 - 307
Copyright
Copyright © International Centre for Diffraction Data 1977

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References

1. Barrett, C.S. and Predecki, Pauls, “Stress Measurement in Polymeric Materials by X-Ray Diffraction,” Polymer Eng. and Sci. 16, 602, 1976.Google Scholar
2. Barrett, C.S., “Diffraction Technique for Stress Measurement in Polymeric Materials,” Adv. in X-Ray Anal. Vol. 20, 329, 1977.Google Scholar
3. “Residual Stress Measurement by X-Ray Diffraction,” SAE Handbook Supplement SAE J784a, Second Edition, 1971, Soc. of Automotive Engineers. Warrendale, PA 15096.Google Scholar
4. Barrett, C.S. and Massalski, T.B., “Structure of Metals,” 3rd ed., McGraw Hill, New York, 1966, pages 471–472.Google Scholar