Accession Number:

ADA235541

Title:

A Three-Dimensional Constitutive Theory for Fiber Composite Laminated Media.

Descriptive Note:

Final rept. Mar 1988-May 1989,

Corporate Author:

LAWRENCE LIVERMORE NATIONAL LAB CA

Personal Author(s):

• Christensen, Richard M.
• Zywicz, Edward

Report Date:

1991-04-01

Pagination or Media Count:

40.0

Abstract:

A three-dimensional elastic constitutive theory is developed for application to fiber composite laminated media. The lamina level constitutive relationship is a specific subset of general transversely isotropic media behavior. This special class of lamina behavior permits the development of an exact lamination procedure for systems assembled from a single lamina type. The three-dimensional constitutive form for the laminate is determined in terms of the sub-scale lamina properties and the orientations of each lamina. The extension of this specific constitutive relationship to general transversely isotropic lamina involves separation of the five lamina-scale properties into fiber-dominated vs. matrix-dominated properties. The resulting three-dimensional constitutivelamination theory is evaluated through comparisons between exact solutions, using data bases appropriate for graphite and glass epoxy systems in quasi-isotropic lay-ups. The theory remains highly effective through the transition from thin laminate to thick laminate behavior and even beyond that through the transition from thick laminate behavior to fully and strongly three- dimensional elastic behavior.

Descriptors:

• *LAMINATES
• *FIBER REINFORCED COMPOSITES
• *GRAPHITE EPOXY COMPOSITES
• INTERFACES
• COMPOSITE MATERIALS
• THEORY
• ELASTIC PROPERTIES
• GLASS
• THREE DIMENSIONAL
• MEDIA
• THINNESS
• BEHAVIOR
• EPOXY COMPOUNDS
• SCALE MODELS
• THICKNESS
• STRESS STRAIN RELATIONS
• DATA BASES

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE