Biaxial Testing of Graphite/Epoxy Composites Containing Stress Concentrations. Part II.
Final rept. 1 Apr 76-31 Mar 77,
IIT RESEARCH INST CHICAGO ILL
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The objective of the program was to study experimentally the deformation and failure under biaxial tensile loading of graphiteepoxy plates containing circular holes and cracks of various sizes and to determine the influence of notch size on failure. The first phase of this program described in a recent report was limited to quasi-isotropic graphiteepoxy laminates. The program consisted of testing uniaxial unnotched and notched specimens and biaxial notched specimens. The approach used was to measure deformations by means of experimental strain analysis techniques, a determine strain concentrations, strain distributions and variations to failure, failure modes and strength reduction ratios. Whenever possible results were compared with analytical predictions. The objective of the second phase of this investigation described in this final report was to further study experimentally the deformation and failure of graphiteepoxy plates with stress concentrations.
- Laminates and Composite Materials