Harmonic balance-based crack size estimation in an ultrasonic fatigue specimen
Résumé
Closing-opening cracks during ultrasonic fatigue tests are suspected to generate nonlinearities in the vibration signal. Due to the periodicity of the ultrasonic transducer and choice of non-smooth stiffness nonlinearity, the Harmonic Balance method is utilized to simulate the resulting 1DOF dynamic model. The energy that transferred from the fundamental harmonic to higher harmonics is represented as a harmonic amplitude ratio parameter and is utilized to inverse model a nonlinear crack parameter for an experimental signal. A feature of this dynamic model allows for the addition of nonlinear effects that evolve with the fatigue specimen's life.
Domaines
Mécanique [physics]
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305803_enoc2020_KISER_GUSKOV_REBILLAT_RANC_v4.pdf (549.39 Ko)
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