Effect of Resin Layer Thickness on Mode II Delamination Growth Property of CFRTP Laminates under Static Loadings

Abstract:

Carbon Fibre Reinforced Thermoplastics (CFRTP) are expected to be used in various fields for the point of their superior mechanical properties. CFRP laminates with continuous fibres tend to be damaged by microcracks in the layer and interlaminar delamination. Especially, it is necessary to evaluate the mode II delamination growth property, which is correlated with compression after impact (CAI) strength. It is reported that CF/Epoxy laminates with a thicker interlaminar resin layer show higher toughness. By applying an extra thick interlaminar resin layer to CFRTP in which thermoplastic resin with relatively higher fracture toughness is used for the matrix, CFRTP with higher interlaminar fracture toughness can be developed. In this study, the mode II delamination growth property of CFRTP laminates under static loading was evaluated for the specimens with various layer thicknesses of polyamide (PA) resin in the middle layer of the laminates. Their moldability and damage propagation properties were evaluated by three-point bending tests and end notched flexure (ENF) tests. CF/PA laminated composites with a thicker PA layer showed superior mode II delamination growth property under static loading since they had more ductile fracture due to a thicker PA layer.

• Periodical: Key Engineering Materials (Volume 827)
• Pages: 446-451
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.827.446
• Online since: December 2019
• Authors: Kazuto Tanaka*, Kosuke Ishida, Keisuke Takemoto, Tsutao Katayama
• Keywords: Carbon Fiber Reinforced Thermoplastics, Crack Propagation, Delamination, Fracture Toughness, Mode II, Resin Layer Thickness

References

[1] G. Marsh, Reinforced thermoplastics, the next wave?,, Reinforced Plastics, Vol.58, No.4 (2014), pp.24-28.

DOI: 10.1016/s0034-3617(14)70177-8

[2] S.M. Lee, Mode II interlaminar crack growth process in polymer matrix composites,, jurnal of reinforced plastics and composites, Vol. 18, (1999), pp.1254-1266.

DOI: 10.1177/073168449901801308

[3] M. Ichiki, H. Suemasu and Y. Aoki, A study on compressive behavior and failure mechanism of impact damaged CFRP laminates,, Japan Society for Composite Materials, Vol.38, No.6 (2012), pp.254-261.

DOI: 10.6089/jscm.38.254

[4] S. Matsuda, M. Hojo, A. Murakami, S. Ochiai, K. Moriya, H. Akimoto and M. Ando Mode II Interlaminar Fracture Toughness of Ionomer Interleaved Carbon Fiber/Epoxy Laminates,, Journal of the Adhesion Society of Japan, Vol. 36, No. 2, (2000), pp.45-52.

DOI: 10.11618/adhesion.36.45

[5] K. Tanaka, K. Ohno, A. Nagatani and T. Katayama, Evaluation of mechanical properties of carbon fiber reinforced polyamide 12 laminates with polyamide 12 elastomer layers,, Journal of the society of materials science, Vol.67, No. 11 (2018), pp.1006-1012.

DOI: 10.2472/jsms.67.1012

[6] S. Aratama, R. Hashizume, K. Koga, M. Nishikawa and M. Hojo, Microscopic Analysis of Effect of Voids on the Strength of CFRP Laminates in Relation to the Loading Direction,, Journal of the Japan Society for Composite Materials, Vol.43, No. 5 (2017), pp.181-192.

DOI: 10.6089/jscm.43.181