Modelling of fiber break as Acoustic Emission Source in Single Fiber Fragmentation Test: comparison with experimental results

摘要

The objective of this work is to build a quantitative relationship between the fiber break as source ofAcoustic Emission (AE) and the detected signal by unravelling the effect of each stage of the AEacquisition chain. For this purpose, an AE modelling is carried out using the Finite Element Method(FEM) and then the simulation is compared to experimental results of Single Fiber Fragmentation Test(SFFT). The SFFT is used in order to produce preferential fiber break. Two different types of transducerare used in order to gather information on a wider frequency bandwidth. The analysis of detected signalsshows an important dependence of the frequency content of the signals on the propagation distance.For the modeling part, the entire geometry of the specimen is modelled. The sensor is taken into accountby its transfer function. The FEM model is used to study the effects of different parameters on the signalsuch as the propagation medium, propagation distance and effect of sensors.