Accession Number:

ADA517478

Title:

Modeling of Mechanical Properties of Advanced Nanostructured Ceramic Composites

Descriptive Note:

Final technical rept. 1 Jan 2007-31 Dec 2009

Corporate Author:

RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG INSTITUTE FOR PROBLEMS IN MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2010-03-15

Pagination or Media Count:

8.0

Abstract:

Mechanical properties of advanced nanostructured ceramic composites are theoretically described with emphasis on the role of defects and interfaces grain and interphase boundaries as well as nanoscale effects in these processes occurring at various length scales. In particular, theoretical models are suggested describing 1 emission of partial dislocations from amorphous intergranular boundaries in ceramic nanocomposites 2 the role of amorphous intergranular boundaries as toughening elements in nanoceramics 3 combined effects of intergrain sliding and diffusion processes on ductility of nanoceramics 4 the grain size effect on crack blunting in nanoceramics at elevated temperatures 5 the strengthening effect of Y-junction nanotubes in ceramic nanocomposites 6 nucleation of nanograins near crack tips and its role as a special toughening mechanism in ceramic nanocomposites 7 generation of nanoscale tracks at defect configurations formed due to intergrain sliding in nanoceramics.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE