Accession Number : AD0747760

Title :   Crack-Tip Deformation Measurements Accompanying Fracture in Fibrous and Laminar Composites.

Descriptive Note : Technical rept.,

Corporate Author : WATERVLIET ARSENAL N Y

Personal Author(s) : Underwood,John H.

Report Date : JUN 1972

Pagination or Media Count : 33

Abstract : Experimental measurements are described of the various types and stages of crack-tip deformation which accompanies crack growth in boron-aluminum sheet and in laminar epoxy bonded and solid steel plate. Optical interference and oblique-light photography are used to show the interaction of a crack with individual fibers and layers in the two systems for various tensile loads and specimen configurations. A fracture mechanics analysis is used to categorize the fracture behavior of boron-aluminum specimens of different fiber orientation. The crack-tip deformation in laminar steel plate under fatigue load is related to the interlayer bond strength and to the subsequent fracture behavior of the plate. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, FRACTURE(MECHANICS)), CRACKS, DEFORMATION, LAMINATES, CRACK PROPAGATION, STEEL, ALUMINUM, BORON

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE