Location

La Jolla, CA

Start Date

1980 12:00 AM

Description

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.

Book Title

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

Chapter

7. Non Metallic NDE, Acoustic Microscopy

Pages

201-208

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Nondestructive Monitoring of Flaw Growth in Graphite/Epoxy Laminates Under Spectrum Fatigue Loading

La Jolla, CA

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.