Effect of stress on energy flux deviation of ultrasonic waves in GR/EP composites

Author

Prosser, William H. ; Kriz, R.D. ; Fitting, Dale W.

Author_Institution

NASA Langley Res. Center, Hampton, VA, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

961

Abstract

Ultrasonic waves suffer energy flux deviation in graphite/epoxy because of the large anisotropy. The angle of deviation is a function of the elastic coefficients. For nonlinear solids, these coefficients and thus the angle of deviation is a function of stress. Acoustoelastic theory was used to model the effect of stress on flux deviation for unidirectional T300/5208 using previously measured elastic coefficients. Computations were made for uniaxial stress along the χ₃ axis (fiber axis) and the χ₁ axis for waves propagating in the χ₁χ₃ plane. These results predict a shift as large as three degrees for the quasi-transverse wave. It is noted that the shift in energy flux offers a new nondestructive technique for evaluating stress in composites

Keywords

carbon fibre reinforced plastics; stress measurement; ultrasonic materials testing; C; acoustoelastic theory; angle of deviation; elastic coefficients; energy flux deviation; fiber axis; graphite fiber reinforced epoxy resin composites; nondestructive technique; nonlinear solids; quasi-transverse wave; ultrasonic waves; uniaxial stress; Anisotropic magnetoresistance; Elasticity; Laminates; NASA; NIST; Optical fiber theory; Stacking; Tensile stress; Ultrasonic variables measurement; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171505

Filename

171505