Abstract
Two optical techniques have been developed to study mixed mode I/III (opening/ tearing) fracture of slabs of transparent brittle materials rigidly supported via epoxy resin through which the fracture stress is applied. Transmittance attributable to optical tunneling in the crack tip vicinity permits measurement of displacements normal to the crack (mode I). Discontinuities across the crack, of multipile beam interference fringes, formed between the free surface of the slab and an optical flat, facilitate measurement of anti-plane (mode III) displacements. Experiments to demonstrate the simultaneous application of these techniques are described for borosilicate glass.
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