Abstract
In this chapter we propose a new methodology for CFRP and GFRP composite testing. One of the most important factors describing such materials is the shear modulus. The test we have carried out included a shear test with digital image correlation and acoustic emission. We proposed to use the acoustic emission method to determine degradation of fiber-reinforced composites.
In our test we used a plane localization of acoustic emission events to show places where the first stage of degradation occurs. In this test, two different materials and two fiber arrangements were used. On top of that, we introduced a few kinds of damage into materials to check how the degradation changed. We wanted to check if the degradation mechanism is changed with the change of material structure and defect presence.
We proved that the degradation mechanism is different. What is more, we determined which mechanism is the reason of destruction in particular materials. The acoustic emission results presented showed that for −45/45° fiber placement, where fibers are longitudinal to main directions of the loaded force, there are places where stresses are concentrated. For 0/90° fiber placement, where fibers are at the angle of 45° to the main force direction, all fibers are involved in transmission of the force. It was also proved that the acoustic emission is suitable for fiber composite testing. Comparing the acoustic emission results obtained during shear test and computer simulation using the finite element method, we can clearly see that the detected acoustic emission sources are found in places where they were predicted by simulations.
To characterize defects in shear samples, we conducted ultrasonic test and SEM observation. It proved that the mechanical defect influenced layers under the surface. Comparing it with the acoustic emission results, we can conclude that we registered friction which was caused by delamination stemming from the mechanical defect.
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Acknowledgments
This work was partially supported by the grant no. PBS1/B6/8/2012 (KOMPNDT project) of Polish National Centre for Research and Development (NCBiR).
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Bardadyn, M. et al. (2017). Evaluation of Acoustic Emission from Damaged CFRP Sheets for Air Industry Applications. In: Shen, G., Wu, Z., Zhang, J. (eds) Advances in Acoustic Emission Technology. Springer Proceedings in Physics, vol 179. Springer, Cham. https://doi.org/10.1007/978-3-319-29052-2_13
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DOI: https://doi.org/10.1007/978-3-319-29052-2_13
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