NDLI: Compression failure mechanisms of composite structures

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Compression failure mechanisms of composite structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Moon, S. Sohi, M. Hahn, H. T.
Copyright Year	1986
Description	An experimental and analytical study was conducted to delineate the compression failure mechanisms of composite structures. The present report summarizes further results on kink band formation in unidirectional composites. In order to assess the compressive strengths and failure modes of fibers them selves, a fiber bundle was embedded in epoxy casting and tested in compression. A total of six different fibers were used together with two resins of different stiffnesses. The failure of highly anisotropic fibers such as Kevlar 49 and P-75 graphite was due to kinking of fibrils. However, the remaining fibers--T300 and T700 graphite, E-glass, and alumina--failed by localized microbuckling. Compressive strengths of the latter group of fibers were not fully utilized in their respective composite. In addition, acoustic emission monitoring revealed that fiber-matrix debonding did not occur gradually but suddenly at final failure. The kink band formation in unidirectional composites under compression was studied analytically and through microscopy. The material combinations selected include seven graphite/epoxy composites, two graphite/thermoplastic resin composites, one Kevlar 49/epoxy composite and one S-glass/epoxy composite.
File Size	55587664
Page Count	118
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860015947
Archival Resource Key	ark:/13960/t7fr4rx9d
Language	English
Publisher Date	1986-06-01
Access Restriction	Open
Subject Keyword	Composite Materials Fracture Mechanics Failure Analysis Compression Tests Acoustic Emission Mechanical Properties Graphite-epoxy Composites Compressive Strength Composite Structures Buckling 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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