Reprint of: Acoustic emission analysis for characterisation of damage mechanisms in fibre reinforced thermosetting polyurethane and epoxy

Damage detection in CFRP by coupling acoustic emission and infrared thermography

“…A C C E P T E D ACCEPTED MANUSCRIPT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 entering the heat equation (1). A thermal data processing based on filtering operations is thus absolutely required to provide a relevant interpretation of sources.…”

“…In a second step, we have analyzed the physical consistency of the discrimination induced by the UPR scheme, that is the relevance of identified classes according to deformation mechanisms observed with DIC technique. According to these two criteria, the most relevant algorithm in the present case is k-means, which has been previously used with success on several composite applications [1,19,20]. MANUSCRIPT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Given the algorithm, a minimization of the number of descriptors is required to enhance the computational efficiency of the data post-processing.…”

“…The best clustering result corresponds to a minimum value of R DB [1,2]. In a second step, we have analyzed the physical consistency of the discrimination induced by the UPR scheme, that is the relevance of identified classes according to deformation mechanisms observed with DIC technique.…”

“…With acoustic emission technique, the energy released during a damage process is detected by piezoelectric sensors in form of transient elastic waves. The study of acoustic emission descriptors allows then to identify specific damage mechanisms of composites [1,2]. This identification is done by the use of Unsupervised Pattern Recognition technique that has been used successfully by different authors in the case of glass fibre composites [3,4].…”

Determining the effect of voids in GFRP on the damage behaviour under compression loading using acoustic emission

“…These specific energy rates are usually connected with similar amplitude rates [23][24][25][26][27][28][29]. In addition a characterisation of failure modes dependent on specific frequency ranges was found [29][30][31][32][33][34]. Due to propagation alterations (e.g.…”