Determination of Interlaminar Fracture Toughness of CFRP Composite in Mode I Using Numerical Simulation with Cohesive Elements

Abstract:

This paper deals with the determination of parameters of the interlaminar failure of the CFRP composite laminate in mode I using numerical simulation with cohesive elements. Knowledge of these parameters is crucial to enable prediction of interlaminar strength of laminates using numerical simulations based on the finite element method with cohesive elements. There are several standardized experimental measurements for determining mode I parameters but not all that are needed for numerical simulations. However, the determination of these parameters and their evolution during cohesive failure is very problematic even if the experimental data is available. This paper deals with the design of a methodology for how to determine these parameters using the fitting process of experimental measurement and numerical simulation. The experimental measurements were done on double cantilever beam specimens according to ASTM standards. The numerical simulations were performed in the Siemens Simcenter software with NX Nastran solver. The numerical model with the obtained parameters shows very good agreement with the experimental measurements. compared to the average experimental values and the analytical calculation, the difference of fracture toughness is up to 1.6 %

• Periodical: Key Engineering Materials (Volume 847)
• Pages: 15-21
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.847.15
• Online since: June 2020
• Authors: Frantisek Sedlacek*, Tomas Kalina, Karel Raz
• Keywords: Cohesive Element, Composite Materials, DCB Test, Finite Element Method, Fracture Toughness, Mode I

References

[1] R. F. Swati, W. L. Hua, H. Elahi, and A. A. Khan, XFEM damage analysis of carbon fiber reinforced composites and crack propagation in mixed-mode and implementation of the method using ABAQUS,, International Journal of Materials, Mechanics and Manufacturing, vol. 6, no. 4, p.286–290, (2018).

DOI: 10.18178/ijmmm.2018.6.4.393

[2] P. Prombut, Caractérisation de la propagation de délaminage des stratifiés composites multidirectionnels. (2007).

[3] O. Allix and P. Ladevèze, Interlaminar interface modelling for the prediction of delamination,, Composite Structures, vol. 22, no. 4, p.235–242, Jan. (1992).

DOI: 10.1016/0263-8223(92)90060-p

[4] L. M. Kachanov, Time of the rupture process under creep conditions, Izy Akad,, Nank SSR Otd Tech Nauk, vol. 8, p.26–31, (1958).

[5] Y. N. Rabotnov, Creep rupture,, in Applied mechanics, Springer, 1969, p.342–349.

[6] J.-L. Chaboche and J. Lemaitre, Mécanique des matériaux solides. Paris: Dunod, (2001).

[7] M. Bruyneel et al., Damage analysis of laminated composites with LMS Samtech SAMCEF: validation on industrial applications,, in American Society for Composites 30th technical Conference, (2015).

[8] T. Kusaka, M. Hojo, Y.-W. Mai, T. Kurokawa, T. Nojima, and S. Ochiai, Rate dependence of mode I fracture behaviour in carbon-fibre/epoxy composite laminates,, Composites Science and Technology, vol. 58, no. 3, p.591–602, Mar. (1998).

DOI: 10.1016/s0266-3538(97)00176-0

[9] P. Qiao, J. Wang, and J. F. Davalos, Tapered beam on elastic foundation model for compliance rate change of TDCB specimen,, Engineering Fracture Mechanics, vol. 70, no. 2, p.339–353, (2003).

DOI: 10.1016/s0013-7944(02)00023-1

[10] S. Jenicek, K. Vratislav, T. Kalina, and B. Masek, Use of waterjet in manufacturing test bars of high-strength steels,, in Proceedings of the 27th DAAAM International Symposium, 2016, p.0219–0224.

DOI: 10.2507/27th.daaam.proceedings.032