Accession Number : ADA187983

Title :   The Influence of Small Defects on Tensile Specimen Ductility and Symmetry of Deformation.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Matic, Peter ; Jolles, Mitchell I

PDF Url : ADA187983

Report Date : 04 Sep 1987

Pagination or Media Count : 37

Abstract : The quantitative translation of physical weld quality into structural integrity prediction depends on accurate characterization of weld material behavior in the presence of fabrication defects. The presence of such defects will, however significantly influence the response of common material test specimens. If the influence of such defects is fully understood, test specimen data may be interpreted in a more meaningful way. The role of a physically relevant geometric imperfection, in the form of a spherical void defect, on cylindrical tensile specimen response is computationally simulated for HY-100 weld metal. Defect radius and location along the specimen axis are treated as independent parameters. Asymmetry of specimen deformation (in terms of specimen neck location) and specimen ductility (in terms of the reduction of area at failure) are computationally predicted. Keywords: Weld metal, Tensile necking, Void defect, Energy density, Tensile specimen, Fracture toughness.

Descriptors :   *DEFECTS(MATERIALS), *FRACTURE(MECHANICS), *WELDS, DEFORMATION, DUCTILITY, EXPERIMENTAL DATA, FABRICATION, GEOMETRY, MATERIALS, NECK(ANATOMY), PREDICTIONS, QUALITY, RADIUS(MEASURE), RELIABILITY, STRUCTURAL PROPERTIES, SYMMETRY, TOUGHNESS, TRANSLATIONS, WELD METAL

Subject Categories : Mechanics
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE