The model of a string on an elastic foundation is applied to study adhesive zone
delamination induced by combined vibrational - pulsed actions. The incubation time criterion is
utilized in order to predict a critical delamination condition. The influence of the background
ultrasonic field onto the value of threshold stress-pulse amplitudes is demonstrated using the
example of several particular cases of external actions. A significant reduction of critical
amplitudes is obtained with certain frequencies of background vibration field.
Keywords: adhesive zone; string on an elastic foundation; pulse-vibration effects.
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