Vibration-based delamination diagnosis and modelling for composite laminate plates

Abstract

This study suggests a methodology for damage diagnosis in structures, which is based on a multivariate statistical procedure and uses the measured time domain structural vibration response. In this paper the methodology is developed for the purposes of delamination assessment in free vibrating composite laminate plates. It applies singular spectrum analysis to the measured strains in order to decompose and compress the information contained in these responses into a smaller number of independent variables. The method works on the principle of clusterization between healthy and delaminated plates with different delamination sizes and locations. The developed methodology is then applied and verified on numerically simulated and experimentally obtained results for composite laminate plates. The results demonstrate a good capability for clusterization between different delamination scenarios in composite laminate plates.

Vibratory behaviour of glass fibre reinforced polymer (GFRP) interleaved with nylon nanofibers

“…As a result, neglecting their inherent nonlinear behaviour can potentially lead to serious errors in the modelling and the estimation of their properties. A number of publications investigated the behaviour of composites and nano-enriched composites and concluded that they are characterized by well-expressed nonlinear behaviour [19][20][21]. This study also proves that using transient vibration analysis rather than modal analysis results in better/more precise prediction of the resultant vibratory behaviour.…”

Electrospun nanofibers as reinforcement for composite laminates materials – A review

“…The study of vibrational behaviour of composites is of great importance, especially for delamination evaluation and non-destructive structural health monitoring techniques [115][116][117]. Despite the literature presents a large number of papers studying vibrations of composites, Table 9 shows that only two papers investigated vibrations of nanomodified laminates.…”

Location of delaminations in curved laminated panels

“…One of the most effective statistical measure is correlation coefficient [16]. It is one of the most often used both in laboratory experiments [17,18,19] and real structures applications [20,21,22]. Delaminations in composite materials are one of the most danger failure mode results typically from impact damage or manufacturing imperfections.…”