Particle-tear energy contribution to the toughness of rubber-modified epoxies
A previously developed model for the toughening effect of rubber particles in rubber-modified epoxies is tested. The model predicts a correlation between toughness of rubber-modified epoxies and tear energy of the dispersed rubber phase. Particulate tear energies are obtained from tear strains of the particles measured in-situ during crack propagation through the composite. Two types of rubber-modified epoxy which had been exposed to various levels of gamma radiation are used to determine the effect of radiation-induced crosslinking on tear energy of the rubber particles. The toughness data of the irradiated composites only partially follow the trend predicted by the particle tear energy model. The toughness of the rubber-modified epoxies increases to a maximum and then decreases at high radiation levels whereas the predicted values increase monotonically with radiation level. Tearing rate and viscoelastic effects on tear energy and particle debonding are believed to cause the discrepancies between the predicted and measured behavior. 7 figures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6109915
- Report Number(s):
- SAND-83-0785C; CONF-830814-2; ON: DE83010396
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360306* -- Composite Materials-- Radiation Effects-- (-1987)
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CROSS-LINKING
ELASTOMERS
ELECTROMAGNETIC RADIATION
EPOXIDES
GAMMA RADIATION
IONIZING RADIATIONS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PHYSICAL RADIATION EFFECTS
POLYMERIZATION
POLYMERS
RADIATION EFFECTS
RADIATIONS
RUBBERS