Structural Assessment of Involutes
Abstract
The involute lay-up technique has been utilized for fabrication of ablative and carbon/carbon nozzle componets for approximately fifteen years. However, the thermal and structural analyses have always been plagued by the lack of data and, more important, a need for predictive model. Almost every component designed has a different helix or arc angle and little, if any, data existed for each 'new' involute configuration. A model for predicting stress/ strain behavior in the cylindrical form using flat laminate mechanical properties was developed by the Air Force Materials Laboratory. The test program conducted to verify this model, using empirical results has been completed. Both a graphite reinforced epoxy and a basic two dimensional carbon/carbon were tested with variables of arc and helix angles. Based on the laminate properties which were obtained during the test program, predictions were made for three graphite/epoxy cylinders and fifteen carbon/carbon cylinders with both uniaxial and combined loading. The cylinders were tested to failure in axial tension, axial compression, hoop tension, hoop compression, and clockwise and counterclockwise torsion. The overall predicted strain measurements were in good agreement with the predicted behavior.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA077875
Entities
People
- D. F. Vronay
- H. O. Davis
Organizations
- Aerojet Rocketdyne Holdings