Advanced Impact Resistant Multidimensional Composites.
Abstract
Conventional pseudo-isotropic advanced composites may be excessively damaged under certain kinds of low mass and velocity impact conditions on naval aircraft. Therefore, a materials development program has been conducted to evaluate the potential of multidimensional graphite fiber reinforced composites for improved impact resistance. Several multidimensional graphite fiber-epoxy composites were fabricated and tested as flexure beams and plates. Both types of tests showed that the multidimensional composites possessed increased impact strength compared to two-dimensional (2D) composites. The data indicated that the construction of the multidimensional composite must be designed for the particular type of impact encountered in order to maximize impact resistance. Post impact examination of the test specimens indicated that the multidimensional composites absorbed energy by different mechanisms than 2D composites. The 2D composites delaminated extensively, while the composite fracture was restricted to a relatively small area in the 3D materials. Therefore, multidimensional composites absorb more energy over a smaller area than 2D laminates. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1979
- Accession Number
- ADA068517
Entities
People
- John W. Herrick