A stress-wave system of three intersecting waves may be generated by electron-pulse techniques. The waves intersect at an angle of 90° and cause a brittle mode of fracture in the superposition interval in otherwise ductile metals. Fractographic investigation shows a peculiar type of intergranular fracture in which individual grains are separated and rotated. Fracture occurs simultaneously at a multitude of locations where the acoustic impedance between individual grain boundaries is sufficiently large.
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Steverding et al. (1972) studied this question.
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