Abstract
The lack of a quick, nondestructive method of flaw detection in composite materials is a hindrance to their use. Optical methods of determining displacements hold promise as a method of detection of these flaws. This paper illustrates the use of digital-image-processing equipment to determine the displacement fields in an internally pressurized composite cylinder. Included are results of actual experiments performed by the authors on both a Plexiglas and a composite cylinder.
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Abbreviations
- b :
-
distance from center of base pins to the point of interest
- B :
-
outside radius
- E :
-
modulus of elasticity
- M :
-
magnification factor
- P :
-
pressure difference
- r :
-
radius
- r c :
-
change in radius
- R i :
-
initial radius
- R ′i :
-
inside radius
- S o :
-
optical distance
- U r :
-
displacement in the radial direction
- U z :
-
displacement in the radial direction
- V f :
-
corrected horizontal in-plane shift in pixels
- V i :
-
uncorrected horizontal in-plane shift in pixels
- V m :
-
apparent horizontal in-plane shift in pixels due to magnification factor only
- y :
-
distance in pixels from the point of interest to the point on the cylinder which has zero horizontal shift
- v :
-
Poisson's ratio
References
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Peters, W.H., Sutton, M.A., Ranson, W.F. et al. Whole-field experimental displacement analysis of composite cylinders. Experimental Mechanics 29, 58–62 (1989). https://doi.org/10.1007/BF02327782
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DOI: https://doi.org/10.1007/BF02327782