Accession Number : ADA300650

Title :   Separation of Fracture-Induced Anisotropy from Background Anisotropy.

Descriptive Note : Final research summary,

Corporate Author : MIAMI UNIV CORAL GABLES FL

Personal Author(s) : Hood, Julie A.

PDF Url : ADA300650

Report Date : 1995

Pagination or Media Count : 6

Abstract : The scientific research goals of this project were to evaluate the effects and determine the amount of oriented, periodic fractures in both heterogeneous, layered isotropic and anisotropic materials by nondestructive evaluation (NDE) methods. The approach was to measure nondestructively the elastic constants of a bulk fractured composite material in order to adequately characterize the material and provide damage assessment. In addition, the effects of the heterogeneous and anisotropic nature of fractured composite materials on plane elastic wave propagation were to be investigated. This work was to involve development of analysis and verification of methods of the quantitative NDE of elastic wave propagation and bulk elastic properties of anisotropic, heterogeneous materials. Work was planned to evaluate wave propagation characteristics in terms of orthorhombic symmetries resulting from fractures embedded in layered composites so as to allow the estimation of fracturing in materials which already possess an inherent anisotropy due to their layering.

Descriptors :   *FRACTURE(MECHANICS), *ANISOTROPY, *BACKGROUND, *SEPARATION, NONDESTRUCTIVE TESTING, VERIFICATION, LAYERS, MATERIALS, COMPOSITE MATERIALS, DAMAGE ASSESSMENT, ELASTIC PROPERTIES, BULK MATERIALS, WAVE PROPAGATION, ISOTROPISM, HETEROGENEITY, PLANE WAVES, ELASTIC WAVES.

Subject Categories : Crystallography
      Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE