Macroscopic fracture behavior: Correlation with microscopic aspects of deformation in toughened epoxies
- Defence Science and Technology Organisation Materials Research Lab., Melbourne (Australia)
The deformation and failure processes involved in the fracture of unmodified epoxies are discussed in this chapter. A review of the fracture behavior of the carboxyl-terminated butadiene-acrylonitrile copolymer (CTBN) rubber-modified diglycidyl ether of bisphenol. A (DGEBA) polymers with or without a rigid particulate - fiber phase is presented in relation to the microscopic aspects of localized deformation and their relationship to microscopic fracture behavior are illustrated. The degree of improvement in fracture properties in modified materials depends to a great extent on the unmodified epoxy. If the latter is capable of even small-scale deformation at the crack tip, this induces in the modified system a number of additional microscopic failure mechanisms such as cavitation of rubber particles; enhanced shear deformation of the matrix, debonding and tearing of rubber, crack pinning, and debonding and pull-out of fibers. The recent research trend in toughening of high-temperature-grade TGMDA (tetraglycidyl 4,4{prime}-methylenedianiline) resin is also outlined. 73 refs., 23 figs., 2 tabs.
- OSTI ID:
- 76236
- Report Number(s):
- CONF-900802--
- Country of Publication:
- United States
- Language:
- English
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