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

Metal forming beyond shaping: Predicting and setting product properties

“…Thermography [75,79] X X X Ultrasonic [21,28] X X X Radiographic inspections [67] X X X Vibrometry [110,226] X X X Acoustic emission [108] X X X Eddy current techniques [233] X X X Magnetic leakage-flux [210,216] X X X Observation of micro-sections [126] X X Density measurement [209] X X Residual stresses X-ray diffraction [16,185] X X X X Hole drilling [16] X X X Neutron diffraction [16] X X Focused acoustic waves [185] X X applicable measurement principles and categorizes them according their capability into in-situ or offline as well as destructive (DT) or nondestructive (NDT) specimen testing. A measurement principle is categorized as in-situ if process control is feasible without specimen sampling and if the evaluation time is shorter than the time during which process parameters change significantly.…”

“…Vibrometry and acoustic emission are based on the observation that a defect part has a different acoustic fingerprint than an undamaged part [108,110]. Both procedures are basically capable for inline quality assurance.…”

Acoustic Emission

“…Since the first publication of the method, it has been adopted by various groups to classify acoustic emission signals [129,139,140,142,143,152]. The overall task of the method is to detect the most significant clusters of the entirety of acoustic emission signals with a minimum of initial assumptions on the cluster structure.…”

Identification of failure mechanisms of metallised glass fibre reinforced composites under tensile loading using acoustic emission analysis

“…For instance, it is not possible to clearly identify which components are being damaged and how crack propagation develops. In particular, it is not possible to determine the load level at which first microcracking occurs within the material [11]. Typical methods for the qualitative characterisation of failure mechanisms in the composite and at the interface after tensile testing are light microscopy and scanning electron microscopy.…”