Process-induced stress relaxation analysis of AS4/3501-6 laminate
- Univ. of Illinois, Urbana, IL (United States). Dept. of Aeronautical and Astronautical Engineering
In this study the process-induced stresses for AS4/3501-6 cross-ply laminates were analyzed. To formulate the constitutive equations, several stress relaxation tests were performed for 3501-6 epoxy resin at different degree of cure states. The master curve and shift function for each degree of cure case were obtained by time-temperature superposition. On the basis of this data, the thermorheologically complex behavior of 3501-6 epoxy resin was modeled. The resin model was then used to formulate the constitutive equations for AS4/3501-6 composite. A finite element method was used to calculate the interlaminar stress relaxation at the free edge of AS4/3501-6 cross-ply laminates during cooldown from the cure temperature. Significant reduction of residual stress was found to occur at a modest (2.5 C/min) cooldown rate.
- OSTI ID:
- 237738
- Report Number(s):
- CONF-9510177--; ISBN 1-56676-376-2
- Country of Publication:
- United States
- Language:
- English
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