NDLI: Basic failure mechanisms in advanced composites. [composed of epoxy resins reinforced with carbon fibers

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Basic failure mechanisms in advanced composites. [composed of epoxy resins reinforced with carbon fibers

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mehan, R. L. Mazzio, V. F. Mullin, J. V.
Copyright Year	1973
Description	The fundamental failure mechanisms which result from the interaction of thermal cycling and mechanical loading of carbon-epoxy composites were studied. This work was confined to epoxy resin uniderictionally reinforced with HTS carbon fibers, and consists of first identifying local fiber, matrix and interface failure mechanisms using the model composite specimen containing a small number of fibers so that optical techniques can be used for characterization. After the local fracture process has been established for both mechanical loading and thermal cycling, engineering composite properties and gross fracture modes are then examined to determine how the local events contribute to real composite performance. Flexural strength in high fiber content specimens shows an increase in strength with increased thermal cycling. Similar behavior is noted for 25 v/o material up to 200 cycles; however, there is a drastic reduction after 200 cycles indicating a major loss of integrity probably through the accumulation of local cleavage cracks in the tensile region.
File Size	10124131
Page Count	103
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740010082
Archival Resource Key	ark:/13960/t9j43j157
Language	English
Publisher Date	1973-06-03
Access Restriction	Open
Subject Keyword	Materials, Nonmetallic Fracture Mechanics Composite Materials Epoxy Resins Failure Analysis Compression Tests Fiber-matrix Interfaces Tensile Tests Thermal Cycling Tests Carbon Loads Forces 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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