Abstract
The results of theoretical and experimental studies of the prefracture state of truss-structure elements with a cut determined by finite-element analysis of the resonance frequencies and modes of forced vibrations, which are associated with the time history of the acoustic-emission parameters, are given. The natural frequencies of plane vibration modes of a delta-shaped truss-structure element most sensitive to changes in the geometrical dimensions (the depth and angle of opening) of a cut are determined. A relationship between the angle of the cut opening and the value of displacements (accelerations) at the truss-structure model points adjacent to the cut is formulated. It is shown that the angle of the cut opening, calculated using this relationship, is completely a deformation criterion of the prefracture state of structures. The values of resonance frequencies of forced vibrations of structure elements at which the critical angle is reached and over which intense cracking begins are found.
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