Curing Stress Fields in Involute Exit Cones
Abstract
A procedure is developed for determining the unusual distribution of ply material in an involute exit cone and then it is used in an analysis of the curing stresses in an IUS exit cone billet. The ply pattern analysis produces three Euler angles at each material point that are used to define properties for a finite element model of the billet. Attention is focused on the delamination failure mode observed during post cure and large regions of cross-ply tension are shown to occur during cool down. Comparisons with autopsy data show that the predicted ply fiber distribution is in good agreement with that observed in the IUS billet, while the finite element stress pattern seems to correlate with observed cracking patterns. Finally, a sensitivity study shows a striking dependence of the interlaminar normal stress on the orientation of the ply pattern on the cloth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1980
- Accession Number
- ADA086404
Entities
People
- N. J. Pagano
Organizations
- Air Force Research Laboratory