Effects of Proof-Test on the Strength and Fatigue Life of a Unidirectional Composite.
Interim technical rept. 1 Apr 78-31 Mar 79,
DYNA EAST CORP WYNNEWOOD PA
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The effects of a static proof-load on the statistical distribution of the static strength and fatigue life of a unidirectional graphite-epoxy laminate As-3501-05 are investigated experimentally. Loading mode for both the static and fatigue tests is restricted to uniaxial tension in the fiber direction. 6-ply tension coupons with dimensions of 22.9 cm x 1.9 cm are used and all tests are conducted using a closed-loop Instron tester, under room temperature 21 C and ambient humidity 60 R.H. conditions. The data are analyzed using a two-parameter Weibull distribution in conjunction with the max. likelihood method for parameter estimation. Results show that proof-load can guarantee a min. static strength, and to less degree can assure a min. fatigue life. Author
- Laminates and Composite Materials