Accession Number:

ADA305097

Title:

Off-Axis Impact of Unidirectional Composites with Cracks: Dynamic Stress Intensification.

Descriptive Note:

Interim rept. 13 Feb 78-12 Feb 79,

Corporate Author:

LEHIGH UNIV BETHLEHEM PA INST OF FRACTURE AND SOLID MECHANICS

Personal Author(s):

Report Date:

1979-01-01

Pagination or Media Count:

75.0

Abstract:

The dynamic response of unidirectional composites under off-axis angle loading impact is analyzed by assuming that the composite contains an initial flaw in the matrix material. The analytical method utilizes Fourier transform for the space variable and Laplace transform for the time variable. The off-axis impact is separated into two parts one being symmetric and the other skew-symmetric with reference to the crack plane. Transient boundary conditions of normal and shear tractions are applied to a crack embedded in the matrix of the unidirectional composite. The two boundard conditions are solved independently and the results superimposed. Mathematically, these conditions reduce the problem to a system of dual integral equations which are solved in the Laplace transform plane for the transform of the dynamic stress intensity factor. The time inversion is carried out numerically for various combinations of the material properties of the composite and the results are displayed graphically. AN

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE