Accession Number:

ADA623070

Title:

Multifunctional Shear Pressed CNT Sheets for Strain Sensing and Composite Joint Toughening

Descriptive Note:

Final rept. 1 Apr 2012-30 Jun 2015

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH

Report Date:

2015-09-30

Pagination or Media Count:

88.0

Abstract:

This research program investigated critical fabrication aspects, mechanical and electrical properties, and potential applications of a novel carbon nanotube material, named shear-pressed sheet. This material is fabricated from the chemical vapor deposition grown, tall aligned carbon nanotube arrays, with the use of automated shear-pressing device. It was shown that such sheets, having typically 50-200 micron thickness, are self-sustained and sufficiently stiff to be removed from the substrate, handled without its shape distortion and then used either in a dry form or as a resin-infused prepreg for interleaving laminated composites and their bonded joints. Extensive set of double-cantilever beam tests of composite laminates with integrated shear-pressed sheets showed substantial, up to two times, improvement in the Mode I interlaminar fracture toughness. Experimental single-lap and double-lap joints of composites with integrated shear-pressed sheet interleaves were manufactured and experimentally evaluated. Embedded carbon nanotube shear-pressed sheets and drawn sheets showed excellent electrical resistance sensitivity and thus a potential for being used as in-situ strain monitoring devices which are practically non-intrusive and may simultaneously provide fracture toughness enhancement.

Subject Categories:

  • Physical Chemistry
  • Laminates and Composite Materials
  • Miscellaneous Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE