Accession Number : ADA305050

Title :   Interlaminar Fracture of Composites.

Descriptive Note : Technical memo.,

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

Personal Author(s) : O'Brien, T. K.

PDF Url : ADA305050

Report Date : JUN 1984

Pagination or Media Count : 40

Abstract : Fracture mechanics has been found to be a useful tool for understanding composite delamination. Analyses for calculating strain energy release rates associated with delamination growth have been developed. These analyses successfully characterized delamination onset and growth for particular sources of delamination. Low velocity impact has been found to be the most severe source of composite delamination. A variety of test methods for measuring interlaminar fracture toughness are being developed to identify new composite materials with enhanced delamination resistance. (AN)

Descriptors :   *FIBER REINFORCED COMPOSITES, *FRACTURE(MECHANICS), *EPOXY LAMINATES, *DELAMINATION, STRESS STRAIN RELATIONS, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, STATIC LOADS, STRUCTURAL ANALYSIS, MODULUS OF ELASTICITY, TOUGHNESS, MATRIX MATERIALS, ENERGY TRANSFER, STRAIN RATE, IMPACT STRENGTH, LOW VELOCITY, CRACK PROPAGATION, SHEAR STRESSES, BUCKLING, FATIGUE(MECHANICS), FAILURE(MECHANICS), CYCLIC LOADS, GRAPHITE EPOXY COMPOSITES.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE