Accession Number : ADP000016

Title :   Static Indentation Tests on Composite Plates for Impact Susceptibility Evaluation,

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

Personal Author(s) : Bostaph,Gretchen M. ; Elber,Wolf

Report Date : SEP 1982

Pagination or Media Count : 30

Abstract : Static indentation tests with spherical steel indenters were conducted on thin composite plates to assess the impact susceptibility of graphite epoxy composites. The data were used to validate an impact strength analysis based on large deflection plate theory. Tests and analysis were in good agreement on both plate stiffness and maximum strain energy at failure. A parametric analysis showed that for brittle matrix composites the matrix dominated the threshold of damage, while in tough matrix composites the fibers dominated the threshold of damage. Penetration was always dominated by large deflection membrane effects. (Author)

Descriptors :   *Mathematical analysis, *Composite materials, *Brittleness, *Static tests, *Impact strength, Fiber reinforced composites, Epoxy compounds, Graphite, Plastic properties, Failure(Mechanics), Equations, Membranes, Stress strain relations, Displacement, Flexural properties, Shear strength, Loads(Forces), Deflection, Modulus of elasticity

Subject Categories : Laminates and Composite Materials
      Numerical Mathematics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE