Accession Number:

ADA426904

Title:

Theory and Modeling of Adaptive Nanocomposites

Descriptive Note:

Final rept. 1 Jan 2001-31 May 2004

Corporate Author:

MARYLAND UNIV COLLEGE PARK

Personal Author(s):

Report Date:

2004-01-01

Pagination or Media Count:

9.0

Abstract:

The theory and phase-field modeling of formation and deformation of adaptive nano-composites containing polydomain martensitic and ferroelastic layers are developed. It has been shown that superplastic and superelastic deformation of heterophase and polydomain martensite structures are reversible in the composites to the contrary to bulk shape memory materials. By the engineering of constraints, the controlled polydomain structures have designed and the characteristics of superelastic and superplastic giant deformation have been optimized. The theory has been applied to the formulation of principles of actuators with enhanced efficiency and efficacy. Two new models of layer actuators were developed based on 1 manipulating a bend curvature by using combination of passive layers with coefficient of thermal expansions and 2 bending of the films transforming by the movement of martensiteaustenite interface oriented along the film.

Subject Categories:

  • Laminates and Composite Materials
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE