Barely visible impact damage detection in composite structures using deep learning networks with varying complexities

Visual inspection is one of the most common non-destructive testing (NDT) methods that offers a fast evaluation of surface damage in aerospace composite structures. However, it is highly dependent on human-related factors and may not detect barely visible impact damage (BVID). In this research, low velocity impact tests with different energy levels are conducted on two groups of composite panels, namely ‘reference’ and ‘sensor-integrated’ samples. Then, the results of impact tests, together with C-scan and visual inspection images, are analysed to define the BVID range and create an original image dataset. Next, four different deep learning models are trained, validated and tested to capture the BVID only from the images of the impacted and non-impacted surfaces. The results show that all four networks can learn and detect BVID quite well, and the sensor-integrated samples reduce the training time and improve the accuracy of deep learning models. ResNet outperforms other networks with the highest accuracy of 96.2% and 98.36% on the back-face of reference and sensor-integrated samples, respectively. The proposed damage recognition method can act as a fast, inexpensive and accurate structural health monitoring tool for composite structures in real-life applications

Protagonisti minori. Amministrazione locale e giustizia nella periferia di Cipro a met\ue0 XVI secolo

Baili, civitani e banieri: queste erano le figure, espressione della societ\ue0 locale cipriota, impegnate nel governo di realt\ue0 secondarie nell\u2019isola, dove la Repubblica non inviava dei propri rappresentanti patrizi. Prendendo come riferimento la contrata Carpathi, situata nella parte nord-occidentale dell\u2019isola e sottoposta all\u2019autorit\ue0 del capitano di Famagosta, questo contributo intende analizzare le modalit\ue0 con cui questi protagonisti minori erano eletti, le loro responsabilit\ue0 nei confronti della comunit\ue0 locale e dei referenti veneziani nell\u2019isola e, infine, il loro ruolo all\u2019interno dell\u2019amministrazione della giustizia nella periferia del regno