Accession Number : ADA587429


Title :   Inkjet Assisted Creation of Self-Healing Layers Between Composite Plies


Descriptive Note : Final rept. 1 Oct 2011-30 Sep 2012


Corporate Author : SHEFFIELD UNIV (UNITED KINGDOM)


Personal Author(s) : Hodzic, Alma ; Smith, Patrick


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a587429.pdf


Report Date : 29 Jul 2013


Pagination or Media Count : 12


Abstract : This project aimed to design and optimize a novel composite system using self-healing agent deposited in microscopically-ordered arrays through ink-jet printing, to arrest cracks along interfaces between composite plies. Novel aspects included the method itself, the highly-controlled crack arrest mechanism provided by self-healing microdroplets between plies, and the ability to rapidly transfer this technology into a prepreg manufacturing process. The approach consisted of depositing novel thermoplastic low-viscosity microdroplets with chemically and mechanically comparable properties to epoxy matrix in aerospace grade composites onto fiber-reinforced epoxy prepregs before curing using an ink-jet system. The report focuses on the most successful configuration using poly(methyl methacrylate) (PMMA) on Boeing-accredited toughened carbon fiber epoxy prepreg Cycom977-2. Double cantilever beam (DCB) and short beam shear (SBS) tests were used to evaluate the self-healing efficiency. It was shown that carefully selected printed self-healing agents increased both shear modulus and fracture toughness simultaneously, without imparting any parasitic weight, and restored the properties of the damaged and self-healed composite to a large degree following post-damage heat treatment. A patent application has been submitted by the University of Sheffield.


Descriptors :   *COMPOSITE MATERIALS , *INK JET PRINTERS , *MECHANICAL PROPERTIES , ARRAYS , CANTILEVER BEAMS , CARBON FIBERS , CRACKING(FRACTURING) , EPOXY COMPOSITES , LAYERS , MANUFACTURING , MICROSCOPY , POLYMETHYL METHACRYLATE , SHEAR MODULUS , TOUGHNESS


Subject Categories : Laminates and Composite Materials
      Printing and Graphic Arts
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE