Abstract
A dot map method was used for direct measurement of the microscopic strain field near a crack tip in a rubber-toughened epoxy. Results indicate that very large viscoelastic strains (37 percent) are present at the crack tip, though elongation in a tensile test is only 5.1 percent. Most of the strain is recovered immediately on unloading, and all of the remaining strain is recovered after annealing above the glass transition temperature.
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