Abstract
This paper concerns the experimental analysis of nonlinear response features of a composite laminate plate for impact damage detection. The measurement procedure is based on the Scaling Subtraction Method (SSM) and consists in exciting the damaged specimen with two sinusoidal signals at different amplitude. The linearly rescaled response signal at low amplitude excitation is subtracted from the response at large amplitude excitation to extract the nonlinear signatures. The latter are analysed in the time domain to infer the presence of damage. Results are compared with frequency domain analyses using the nonlinear vibro-acoustic modulation technique (NWMS). Changes in amplitude and phase as well as modulation effects of the acquired responses are also monitored. Surface-bonded, low profile piezoceramic transducers are used for excitation and sensing. Both measurements techniques are applied to detect barely visible impact damage in laminate composite plate. Non-destructive penetrant-enhanced X-ray inspections are carried out to characterize the extent of internal damage. The behavior of the nonlinear features and the sensitivity of each technique are also investigated in the paper.
Highlights
Non-destructive evaluation techniques (NDE) are commonly adopted to assess structural integrity
This paper presents an application of the Scaling Subtraction Method (SSM) to detect barely visible impact damage in a composite laminate plate
To highlight the contribution to nonlinearities given by amplitude and phase variation, the recorded signals were analysed in the frequency domain
Summary
Non-destructive evaluation techniques (NDE) are commonly adopted to assess structural integrity. Low profile piezoceramic transducers were used in the test both to excite the plate with sinusoidal signals at different amplitudes and to acquire the response in different points. The SSM damage indicators are analysed in the time domain and compared with the results of a frequency domain analysis carried out with the Nonlinear Acoustic Wave Modulation technique (NWMS) [6,7,8].
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