“…Numerical investigations of forced vibrations o f beams with a closing crack [4][5][6][7] have demonstrated that the main distinctive features of such a vibration system are the manifestation of effects associated with non-linearity, namely the presence of sub-and superharmonic resonances and significant non-linearity of the vibration responses (displacement, acceleration, * Report on International Conference "Dynamics, Strength, and Life of Machines and Structures" (1-4 November 2006, Kiev, Ukraine). strain) at sub-and super-resonances.…”