Design of Laminated Composite with a Controlled-Damage Concept
Composites Science and Technology
Effects of adhesive strips embedded at the interface in graphite/epoxy laminates on damage tolerance are investigated. Specimens were impact tested under approximately fixed-fixed boundary conditions. Comparisons were made between the specimens with and without the adhesive from X-ray radiographs. Delamination plotted against velocity shows substantially reduced delamination in specimens with adhesive compared with specimens without adhesive. It was observed that below a certain velocity the adhesive acts as a softening strip which confines the delamination to the area of the mesh formed by the adhesive. Three-point-bend tests show that the failure load of plain specimens is higher than for the specimens with adhesive before impact; however, after impact the strength degradation is more severe in the plain specimens. Damage mechanisms of impacted specimens were examined through the use of microphotographs.
Sun, C. T. and Norman, Timothy L., "Design of Laminated Composite with a Controlled-Damage Concept" (1990). Engineering and Computer Science Faculty Publications. 243.