The combined use of millimeter wave imaging and acoustic emission for the damage investigation of glass fiber reinforced polymer composites

Kalteremidou, Kalliopi-Artemi; Vrije Universiteit Brussel; Belgium

Kalteremidou, K-A.; Vrije Universiteit Brussel; Belgium
Pourkazemi, A.; Vrije Universiteit Brussel; Belgium
El Idrissi, Y.; Vrije Universiteit Brussel; Belgium
Morabet, Y.; Vrije Universiteit Brussel; Belgium
He, G.; Vrije Universiteit Brussel; Belgium
Stiens, J.; Vrije Universiteit Brussel; Belgium
Pyl, L.; Vrije Universiteit Brussel; Belgium
van Hemelrijck, D; Vrije Universiteit Brussel; Belgium

ID: ECNDT-0563-2018
Download: PDF
Session: Composite Material - AE
Room: G1
Date: 2018-06-12
Time: 09:40 - 10:00

Polymer composite materials are used in numerous applications, including automotive and civil engineering. The mechanical behaviour and damage of composites is not as straightforward as that of more conventional materials, like metals. Different damage modes are developed depending on different parameters; material properties, lay-up and loading conditions. However, investigating the damage of composites with respect to all these parameters is of great importance if full characterization of the materials is necessary. Moreover, monitoring the damage of composites under different circumstances in lab conditions can be used as damage predictive tool in real applications and for the establishment of damage criteria. For all above reasons, Non-Destructive Techniques (NDTs) are usually used to monitor the damage of materials. Acoustic Emission (AE) is commonly used to distinguish damage modes of the composites by interpreting the elastic waves that generate in the material when it undergoes irreversible changes. AE is a powerful technique and by using relatively simple equipment, damage can be detected and characterized during loading. However, interpretation of the AE data is not so simple in the case of composites and most of the times it can provide qualitative but not quantitative conclusions. For this reason, in this research AE is combined with Millimeter Wave Imaging, which is an emerging method based on electromagnetic wave radiation within the 30 to 300 GHz band, enabling non-invasive, non-ionizing and non-contact examination of dielectric materials, like Glass Fiber Reinforced Polymers (GFRPs). The Millimeter Wave Imaging technique used in our research combines various advantages in comparison to other NDTs, like high resolution, high defect-detection and positioning capability, owing to its high penetration capability. In this research, the potential of combining the two NDTs, AE and Millimeter Wave Imaging for the damage characterization of GFRP flat specimens under tensile loads is investigated for the first time.