Abstract
Ultrasonic shear waves with a large amplitude and a frequency of 3.63 MHz were applied to a notched PMMA plate under uniaxial tension in order to produce artificial Wallner lines by altering the direction of the maximum principal stress during the rapid growth of fracture. The amplitude of the lines generated was found to be of the order of 10–102 nm and has been shown to change proportionally to the input-wave amplitude. The interference colors observed indicate that the PMMA crack front is very liable to proceed inside the crazed layer ahead of the front; despite the intensive ultrasonic stress modulation very few cracks which reached or crossed the craze-matrix boundaries were found.
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