Influence of thickness in the fracture resistance of conventional and laminated DRA materials

Journal Article · Fri Jul 15 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90173-2· OSTI ID:7037041

Osman, T M; Lewandowski, J J ^[1]

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1. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering

Recently, laminate structures have been investigated as a method for enhancing the fracture resistance of discontinuously reinforced aluminum (DRA) materials. Laminated DRA materials have been constructed which contain alternating layers of DRA material and monolithic aluminum. Initiation in these laminates has been found to preferentially occur in the DRA layers. After initiation, stable crack growth is produced in the DRA material via a crack bridging mechanism in which the ductile aluminum ligaments in the crack wake serve to reduce the driving force for propagation in the DRA layer. In a manner similar to that of Kaufman and Goolsby, it was proposed that the initiation toughness of the DRA laminates may be improved if the thickness of the DRA layers was reduced. The goal of this study was to investigate the influence of thickness on the toughness of a DRA material based upon a transition from plane strain to plane stress conditions and how this transition may affect the fracture resistance of laminated DRA materials. The following sections document initial attempts to determine the influence of DRA thickness on toughness both in conventional DRA materials and laminated DRA materials.

• OSTI ID: 7037041
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:2; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
COPPER ALLOYS
DATA
EXPERIMENTAL DATA
FRACTURE PROPERTIES
INFORMATION
LAYERS
MAGNESIUM ALLOYS
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
SILICON CARBIDES
SILICON COMPOUNDS