Location

La Jolla, CA

Start Date

1981 12:00 AM

Description

Ultrasonic and acoustic emission techniques were used to monitor and evaluate material damage in a graphite/epoxy laminate containing a machined hole as an initial flaw and subjected to fully reversed spectrum fatigue loading at room temperature. It was found that the flaw growth progressed radially around the initial hole at a uniform rate during cycling at the lower stress levels. At the higher levels, material damage accelerated dramatically, progressing faster in the transverse direction toward the free edges. By close examination of the A-scan and RF spectrum photographs, it was determined that damage modes could be defined as to their extent and relative location within the specimen. These conclusions were supported by photographs of the failed specimen.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

5. Composites, Adhesive Bonds, New Phenomena and Problems

Pages

69-77

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Nondestructive Evaluation of Graphite/Epoxy Composite Damage

La Jolla, CA

Ultrasonic and acoustic emission techniques were used to monitor and evaluate material damage in a graphite/epoxy laminate containing a machined hole as an initial flaw and subjected to fully reversed spectrum fatigue loading at room temperature. It was found that the flaw growth progressed radially around the initial hole at a uniform rate during cycling at the lower stress levels. At the higher levels, material damage accelerated dramatically, progressing faster in the transverse direction toward the free edges. By close examination of the A-scan and RF spectrum photographs, it was determined that damage modes could be defined as to their extent and relative location within the specimen. These conclusions were supported by photographs of the failed specimen.