A kompozit anyagok károsodásának észlelése rendkívül fontos azok alkalmazása szempontjából. A cikk megvizsgálja a kísérleti modális elemzési módszer alkalmazását a károsodás jelenlétének kimutatására az szálerősített kompozit anyagú (FRP) próbatesten. A tanulmány célja a sérülések felderítésének, azok hatékonyságának vizsgálata a sérült és nem sérült üvegszállal erősített polimer, egyszerű geometriájú próbatestek zaj, rezgés (NVH) viselkedésének vizsgálatával. A próbatestben mesterségesen előidézett hiba a dinamikus paraméterek, például a sajátfrekvenciák, változását okozzák. Az eredmények azt mutatják, hogy az alkatrész NVH tulajdonságai megváltoztak a károsodások során, ami a kísérleti modális elemzés érzékenységét mutatja meg a károsodás szempontjából.
Fibre reinforced polymer (FRP) components can have visible or non-visible damages because of an impact, crush, or fatigue during the regular operation hours. These components or structures have to be continuously monitored in order to ensure an early detection of deterioration. This paper uses the vibration decay rate experimentally as a method to detect damages in a FRP component. Measurement of reverberation time RT 60 is executed in three different damage conditions of a specimen made of fibre reinforced polymer. The conditions of the specimen vary based on the damage existence in it. The major concern is on predicting damages presence by the measured data. The resulted data showed a clear difference among the three conditions proving the damages existence.
In this paper, swarm intelligence optimisation algorithms are used to estimate the optimal size of the glass fibre of circular cross-section of a glass-epoxy composite. Finding the best fibre size in a composite material has significant benefits on cost reduction. A comparative study was done to select optimal fibre diameterthat can satisfy the optimal longitudinal tensile strength. Particle swarm optimisation algorithm PSO and artificial bee colony algorithm ABC are proposed for this comparative study.
Failure of composite materials due to poor anticipations of damages occur very frequently. Damages in composite materials may exist as visible or non-visible with different configurations and identities. Thus, investigation of damages existence in composite materials has to have prior attention to avoid the failure of structures. The current work investigates the damping response offered by a damaged fiber-reinforced polymer plate. The plate is put under three different conditions regarding the damage existence. The focus is to measure the loss factor in all cases and determine whether there is a difference among them to prove damage presence in the composite part. The loss factor is experimentally measured by measuring the reverberation time RT60. The resulting data of loss factors show a well-distinguished difference that might lead to predicted damages and to do a more expanded analysis of this issue.
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