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Correlation of fiber composite tensile strength with the ultrasonic stress wave factorAn ultrasonic-acoustic technique was used to indicate the strength variations of tensile specimens of a graphite-epoxy composite. A 'stress wave factor' was determined and its value was found to depend on variations of the fiber-resin bonding as well as fiber orientation. The fiber orientations studied were 0 deg (longitudinal), 10 deg (off-axis), 90 deg (transverse), (0 deg/+ or - 45 deg/0) symmetrical, and (+ or - 45 deg) symmetrical. The stress wave factor can indicate variations of the tensile and shear strengths of composite materials. The stress wave factor was also found to be sensitive to strength variations associated with microporosity and differences in fiber-resin ratio.
Document ID
19780049298
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vary, A.
(NASA Lewis Research Center Cleveland, OH, United States)
Lark, R. F.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1978
Subject Category
Composite Materials
Meeting Information
Meeting: American Society for Nondestructive Testing, Spring Conference
Location: New Orleans, LA
Start Date: April 3, 1978
End Date: April 7, 1978
Sponsors: American Society for Nondestructive Testing
Accession Number
78A33207
Distribution Limits
Public
Copyright
Other

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