Acoustic Emission Analysis for Assessment of Damage Kinetics of Short-Glass Fibre-Reinforced Thermoplastics—ESEM Investigations and Instrumented Charpy Impact Test

摘要: The acoustic emission (AE) analysis is a structure-sensitive test method of plastic diagnostics, which enables the characterisation damage kinetics as well mechanisms under specific conditions. AE linked to release stored elastic energy, propagates spherical volume wave in material. In this work, short-glass fibre-reinforced thermoplastic materials were examined quasi-static tensile environmental scanning electron microscope (ESEM) with simultaneously recording impact-loading conditions instrumented Charpy impact (ICIT). Therefore, it was possible couple mechanical, and micromechanical results describe kinetic mechanisms. dependence on bonding glass fibre polymer matrix, different be related typical frequency ranges can detected: (i) fracture, (ii) matrix deformation slipping fibres delamination area friction processes (iii) debonding pull-out with/without yielding. coupling ICIT allows assessment therefore, determination initiation However, various conditions, could found. For good takes placed before material behaviour changes from elastic–plastic behaviour. This found for high-density polyethylene materials. polybutene materials, first place at point An energetic approach by parameter J Si shows an independent content. all investigated thermoplastics, Si-value 0.8 N/mm resistance against stable crack propagation determined.