The development and evaluation of an experimental apparatus for the investigation of fastener pull-through failure in graphite-epoxy laminates.
Abstract
This thesis examines the failure at a fastener hole in a
composite fuel tank skin due to hydraulic ram; i.e. fluid
pressure due to a penetrating projectile. An experimental
apparatus was set up to investigate the triaxial loading
conditions at the fastener hole so that an M-P-N failure surface
could be developed for the graphite-epoxy laminate. An
expression was derived to predict the bending moment at the fastener in terms of the pull force on the fastener and the
axial force in the plate. Aluminum specimens were tested
and the results were compared with the predicted results
to validate the experimental procedure. The experimental
results were found to not be repeatable, and hence a
correlation with the predicted results was not appropriate.
The non-repeatability could not be explained. Composite
specimens were fabricated and prepared for testing.
Experimental values for the ultimate pure pull force, P,
ultimate pure bending moment, M, and ultimate pure axial
force, N, were obtained.
Rights
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