Analysis of Porous Laminates in the Presence of Ply Drop-Offs and Fastener Holes.
Final technical rept. Jun 82-May 84,
NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV
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Finite element analyses were carried out to predict the effects of microporosity, ply drop-offs and fastener holes on the compression behavior of AS13501-6 graphiteepoxy laminates. Both two dimensional 2-D and three dimensional 3-D analyses were performed. The validity of the analyses were established by comparing their predictions with available experimental results. The analysis of the ply drop-offs predicted little influence of their presence on the compressive strength. It also predicted that the laminate containing the Oo ply drop-off s should have about the same compressive strength in either the room temperature wet or dry states, which was also correlated experimentally. Likewise, the predicted strength reduction due to the presence of a circular hole in a specific laminate correlated well with available experimental data. MM
- Attack and Fighter Aircraft
- Laminates and Composite Materials