Browsing by Author "Camacho, Javier"
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Item A non-destructive quality assessment for blind-fastener installations based on the combination of ultrasound techniques and real-time monitoring of the fastening process(2016-05-01) Camacho, Javier; Rivero, Asun; Veiga, Fernando; Guzman, Desiree; SG; Tecnalia Research & InnovationThis paper proposes and evaluates a non-destructive method in assessing the quality of blind-fastener installations. The method is based on combining the time of flight of an ultrasonic pulse along the pin of the fastener and the fastener installation time. The former has to be measured after the fastening process; the latter has to be acquired at the machine during the fastening. The tests performed on carbon fibre reinforced plastic laminates joined by means of ABS0257 blind fasteners have proved that the method can distinguish incorrectly installed fasteners due to improper grip selection. The hit rate of the developed non-destructive method is above 95 % for the tested range of fastener sizes. The implementation of this method might prevent the use of extra fasteners, currently required, in order to compensate for the uncertainty of blind-fastener installationsItem On-Line Monitoring of Blind Fastener Installation Process(2019) Camacho, Javier; Veiga, Fernando; Penalva, Mari Luz; Diez-Olivan, Alberto; Deitert, Lutz; López de Lacalle, Norberto; Tecnalia Research & Innovation; FABRIC_INTELBlind fasteners are of special interest for aircraft construction since they allow working on joints where only one side is accessible, as is the case in many common aerospace box-type structures, such as stabilizers and flaps. This paper aims to deliver an online monitoring method for the detection of incorrect installed blind fasteners. In this type of fastener, the back side of the assembly is not accessible, so monitoring the process installation is suitable as a system to assess the formed head at the back side with no access. The solution proposed consists of an on-line monitoring system that is based on sensor signals acquired during the installation. The signals are conveniently analyzed in order to provide an evaluation outcome on how the fastener was installed. This new method will help production to decrease/eliminate time and cost-intensive inspections and fasteners over installation in structures. The decrease of the number of installed fasteners will also contribute to weight savings and will reduce the use of resources.