ULTRASONIC MONITORING OF FLAW GROWTH IN GRAPHITE/EPOXY LAMINATES UNDER FATIGUE LOADING.

I. M. Daniel*, S. W. Schramm, T. Liber

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

In the reported experiments, ultrasonic 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. The specimens were graphite/epoxy (AS3501-5A) coupons of left bracket (0/ plus or minus 45/90)//s right bracket //2 and left bracket O//2/ plus or minus 45 right bracket //2//s layups. 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 environment. Flaw growth was also greater in specimens of left bracket (O/ plus or minus 45/90)//s right bracket //2 layup than in those of left bracket O//2/ plus or minus 45 right bracket //2//s layup. No significant reduction in residual tensile strength (in general less than ten percent) was observed for any of these groups of specimens.

Original languageEnglish (US)
Pages (from-to)267-282
Number of pages16
JournalTechnical Conference Proceedings - Irrigation Association
StatePublished - Jan 1 1980
EventAdv Compos, Spec Top, Pap Presented at the Conf - El Segundo, Calif, USA
Duration: Dec 4 1979Dec 6 1979

ASJC Scopus subject areas

  • Engineering(all)

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