Accession Number:

ADA439722

Title:

Multi-Scale Approach to Investigate the Tensile and Fracture Behavior of Nano Composite Materials

Descriptive Note:

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE

Personal Author(s):

Report Date:

2005-08-30

Pagination or Media Count:

40.0

Abstract:

This program is concerned with the effects of nano size particles on the tensile and fracture behavior of particulate composite materials. The programs basic approach involves a blend of experimental and analytical studies. In general, mechanisms and mechanics involved in the damage process and cohesive fracture are emphasized. Special issues that will be addressed are 1 To what extent and by what mechanism do the nano size particles affect damage initiation and evolution processes, deformation processes, and crack growth behavior 2 What are the deformation and failure mechanisms on the meso and the macro levels 3 How do the nano size particles affect the characteristics of the interphase between the particle and binder and 4 what is the role of the interphase properties in damage initiation and evolution processes The objectives of the proposed research are to 1 obtain a fundamental understanding of the effects of nano size aluminum particles on the constitutive and crack growth behavior of particulate composite materials, 2 investigate the effects of aluminum particle size on deformation mechanism, damage process, hysteresis, and fracture strength under a constant strain rate condition, 3 determine the role of the interphase in damage initiation and evolution processes, 4 determine the deformation and failure mechanisms on meso and macro scales, 5 develop a statistical based technology to evaluate the inherent material quality, and 6 provide guidance for developing high strength solid propellants containing nano size particles.

Subject Categories:

  • Mechanics
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE