Cure shrinkage of thermoset composites
- USAF, Wright Lab., Wright-Patterson AFB, OH (United States)
The shrinkage of thermoset composites during cure was studied using a volumetric dilatometer. The material systems studied were AS4 carbon fiber/Hercules' 3501-6 epoxy, IM7 carbon fiber/Hercules 8551-7A toughened epoxy and IM7 carbon fiber/BASF's 5250-4 bismaleimide. Shrinkage of the samples due to both polymerization and thermal expansion effects was seen. The volume changes of the materials during cure were then compared to results from dynamic mechanical analysis (DMA) and dielectric cure monitoring. Maximums in volume corresponded to minimums in storage and loss modulus from DMA and maximums in the dielectric loss factor. Resin shrinkage during the 177 deg C (350 F) hold corresponded to the onset of polymerization seen by the rapid increase in the storage modulus and the decrease in the dielectric loss factor response due to reduced ion mobility. These results show that volumetric dilatometry can be an effective tool in the development of materials processing strategies and can be useful in studying residual stresses in composites. 9 refs.
- OSTI ID:
- 6204988
- Journal Information:
- SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States), Journal Name: SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States) Vol. 24:2; ISSN SAMQA2; ISSN 0036-0821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
CARBON FIBERS
COMPOSITE MATERIALS
CURING
ELASTICITY
EXPANSION
FIBERS
MATERIALS
MECHANICAL PROPERTIES
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
REINFORCED MATERIALS
REINFORCED PLASTICS
RESIDUAL STRESSES
SHRINKAGE
STRESSES
SYNTHETIC MATERIALS
TENSILE PROPERTIES
THERMAL EXPANSION