NDLI: Fracture mechanics of matrix cracking and delamination in glass/epoxy laminates

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Fracture mechanics of matrix cracking and delamination in glass/epoxy laminates

Content Provider	NASA Technical Reports Server (NTRS)
Author	Zanotti, C. Caslini, M. Obrien, T. K.
Copyright Year	1986
Description	This study focused on characterizing matrix cracking and delamination behavior in multidirectional laminates. Static tension and tension-tension fatigue tests were conducted on two different layups. Damage onset, accumulation, and residual properties were measured. Matrix cracking was shown to have a considerable influence on residual stiffness of glass epoxy laminates, and could be predicted reasonably well for cracks in 90 deg piles using a simple shear lag analysis. A fracture mechanics analysis for the strain energy release rate associated with 90 deg ply-matrix crack formation was developed and was shown to correlate the onset of 90 deg ply cracks in different laminates. The linear degradation of laminate modulus with delamination area, previously observed for graphite epoxy laminates, was predicted for glass epoxy laminates using a simple rule of mixtures analysis. The strain energy release rate associated with edge delamination formation under static and cyclic loading was difficult to analyze because of the presence of several contemporary damage phenomena.
File Size	2778805
Page Count	48
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860023057
Archival Resource Key	ark:/13960/t5r837798
Language	English
Publisher Date	1986-09-01
Access Restriction	Open
Subject Keyword	Composite Materials Glass Fiber Reinforced Plastics Fatigue Life Fracture Mechanics Strain Energy Release Rate Strain Energy Methods Epoxy Compounds Delaminating Graphite-epoxy Composites Cracking Fracturing Stiffness Matrix Materials 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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