Analysis of elastic nonlinearity for impact damage detection in composite laminates

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Frau, A.^1 ; Pieczonka, L.^2 ; Porcu, M.C.^1 ; Staszewski, W.J.^2 ; Aymerich, F.^1

University of Cagliari, Department of Mechanical, Chemical and Materials Engineering, Piazza d'Armi, Cagliari

09123, Italy^1

AGH University of Science and Technology, Department of Robotic and Mechatronics, Al. A. Mickiewicza 30, Krakow

30-059, Poland^2

关键词: Barely visible impact damages;    Composite laminate plate;    Elastic non-linearity;    Experimental analysis;    Impact damage detection;    Measurement procedures;    Non-linear response;    Piezoceramic transducer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012103/pdf
DOI  :  10.1088/1742-6596/628/1/012103

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.