Nondestructive Monitoring of Flaw Growth in Graphite/Epoxy Laminates Under Spectrum Fatigue Loading
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Ultrasonic and acoustic emission techniques were used to monitor flaw growth in graphite/epoxy laminates containing four types of initial flaws and subjected to fully reversed spectrum fatigue loading, including temperature and moisture variations. In general, it was found that flaw growth was much more pronounced in the specimens exposed to environmental fluctuations in addition to the load spectrum, than in those tested in an ambient environmenc. Flaw growth was also greater in specimens of [(0/+45/90)s)2 layup than in those of [02/+45]2s layup. No significant reduction in residual tensile strength (in general less than ten percent) was observed for any of these groups of specimens.