NDLI: Evaluation of composite flattened tubular specimen. [fatigue tests

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Evaluation of composite flattened tubular specimen. [fatigue tests

Content Provider	NASA Technical Reports Server (NTRS)
Author	Liber, T. Daniel, I. M.
Copyright Year	1978
Description	Flattened tubular specimens of graphite/epoxy, S-glass/epoxy, Kevlar-49/epoxy, and graphite/S-glass/epoxy hybrid materials were evaluated under static and cyclic uniaxial tensile loading and compared directly with flat coupon data of the same materials generated under corresponding loading conditions. Additional development for the refinement of the flattened specimen configuration and fabrication was required. Statically tested graphite/epoxy, S-glass/epoxy, and Kevlar 49/epoxy flattened tube specimens exhibit somewhat higher average strengths than their corresponding flat coupons. Flattened tube specimens of the graphite/S-glass/epoxy hybrid and the graphite/epoxy flattened tube specimens failed in parasitic modes with consequential lower strength than the corresponding flat coupons. Fatigue tested flattened tube specimens failed in parasitic modes resulting in lower fatigue strengths than the corresponding flat coupons.
File Size	15484991
Page Count	143
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19780017190
Archival Resource Key	ark:/13960/t8hf2n45z
Language	English
Publisher Date	1978-06-01
Access Restriction	Open
Subject Keyword	Composite Materials Specimen Geometry Fatigue Tests Stress-strain Relationships Epoxy Resins Fatigue Materials Cyclic Loads Kevlar Trademark Static Loads Flatness 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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