Accession Number : ADA302602

Title :   Failure Mechanics in Low-Velocity Impacts on Thin Composite Plates.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Elber, Wolf

PDF Url : ADA302602

Report Date : MAY 1983

Pagination or Media Count : 27

Abstract : Eight-ply quasi-isotropic composite plates of Thornel 300 graphite in Narmco 5208 epoxy resin (T300/5208) were tested to establish the degree of equivalence between low-velocity impact and static testing. Both the deformation and failure mechanics under impact were representable by static indentation tests. Under low-velocity impacts, such as tool drops, the dominant deformation mode of the plates was the first, or static, mode. Higher modes are excited on contact, but they decay significantly by the time the first-mode load reaches a maximum.

Descriptors :   *IMPACT STRENGTH, *FAILURE(MECHANICS), *GRAPHITE EPOXY COMPOSITES, TEST AND EVALUATION, STRESSES, FIBERGLASS, DAMAGE, TOOLS, IMPACT TESTS, DEFORMATION, DISPLACEMENT, TENSILE PROPERTIES, COMPOSITE STRUCTURES, STRAIN(MECHANICS), X RAYS, LOW VELOCITY, PLATES, THINNESS, DELAMINATION, STATIC TESTS, PEEL STRENGTH.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE