NDLI: Notched and unnotched fatigue behavior of angle-ply graphite/epoxy composites

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Notched and unnotched fatigue behavior of angle-ply graphite/epoxy composites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ramani, S. V. Williams, D. P.
Copyright Year	1976
Description	The axial fatigue behavior of both notched and unnotched graphite/epoxy composites was studied. In unnotched studies, conducted on a 0/+ or - 30 3S AS/3501 laminate, S-N curves were determined for various stress ratios R using simply supported test specimens. Apparent fatigue limits in tension-tension (T-T) and compression-compression (C-C) cycling occurred at about 60% of the respective static strengths. The overall results were expressed in the form of a constant life diagram showing the relationship between mean stress and stress amplitude. The diagram illustrates a skew-symmetry in fatigue life caused by the relatively low compressive strength of the unrestrained test specimens used. In effect, a maximum in fatigue properties occurs at a positive value of mean stress. Results are of significance in situations where structural members are buckling or crippling critical in design.
File Size	2001097
Page Count	38
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19770009173
Archival Resource Key	ark:/13960/t4xh4cz1j
Language	English
Publisher Date	1976-12-01
Access Restriction	Open
Subject Keyword	Composite Materials Fatigue Tests Notch Strength Epoxy Resins Fatigue Materials Cyclic Loads Graphite Aircraft Construction Materials Laminates Residual Stress Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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