Carrella-Payan, D

Daelemans, Lode

Hack, M

Magneville, B

Naito, T

Van Paepegem, Wim

Yokozeki, T

English

Ghent University Academic Bibliography

18th European Conference on Composite Materials Characterization of CFRP mode I and mode II cohesive element parameters for 0//0 and +45//-45 interfaces D. Carrella-Payan1, B. Magneville1, T. Naito2, R. Aoki3, T. Yokozeki3, L. Daelemans4, W. Van Paepegem4, M. Hack1  1 Siemens PLM Software, Leuven (BE), 2 Honda R&D Co Ltd, Tochigi (JP), 3 Department of Aeronautics and Astronautics, University of Tokyo (JP), 4 Department of Materials Science and engineering, Ghent University (BE)  Keyword:  Angled-ply, mode I, mode II, static, parameter identification, Finite element analysis (FEA) Abstract Decades of research on composites showed that delamination is one of the most critical parameters responsible for failure of a laminated composite design. Today, the research community is investing effort in understanding, characterizing and predicting the delamination onset and propagation under static and fatigue loading. Characterization of Mode I (opening) and Mode II (shearing) interface failure mode have been extensively studied for 0//0 interfaces 1–8. However, simulation requires also delamination prediction at “non-zero” interfaces (+Ɵ//-Ɵ, Ɵ being a non-zero angle between two consecutive plies where the delamination occurs).  Characterization of such interfaces in static and fatigue are not yet covered by standardized methods but prove to be key for industrial usage 9–12. This work presents and proposes a robust process flow to characterize interlaminar static properties for CFRP at 0//0 and +45//-45 interfaces. Initial estimation of the interlaminar cohesive element parameters were derived from a set of testing data via standard analytical formulations (compliance calibration, Modified beam theory …). The onset detection was cross-evaluated using optical method (microscopy) and FEA correlation (including damage intraplies model). Finally influence of the testing method (ASTM, JIS), pre-cracking method (mode I or mode II resulting in different crack front shape), pre-crack length and resin system on the identified parameters were investigated using scanning electron microscopy, dynamic mechanical thermal analysis, FEA correlation and X-Ray.  a)                                                                     b) Figure 1 – a) microscopic and X-Ray pictures ENF +45//-45 interfaces with mode I pre-crack method,  b) FEA prediction of onset and propagation in mode I “pre-cracking method” for +45//-45 interfaces. The process flow for parameter identification herein proposed covers static parameters for standard separation law of cohesive zone models used in Simcenter 3D - Samcef and will be extended to fatigue parameter identifications for the interlaminar fatigue prediction models.  18th European Conference on Composite Materials References: 1. Czabaj, M. W. & Ratcliffe, J. G. Composites Science and Technology 89, 15–23 (2013). 2. Davies, P. et al. Plastics, rubber and composites 28, 432–437 (1999). 3. Gutkin, R. et al. International Journal of Solids and Structures 48, 1767–1777 (2011). 4. Hansen, P. & Martin, R. European Research Office of the US Army, Final Report (1999). 5. Hojo, M., et al. Composites 26, 243–255 (1995). 6. Martin, R. H. composite materials: testing and design 9, 251–270 (1990). 7. Murri, G. B. ASC 27th technical conference, ASTMD30 Meeting(2012). 8. Stevanovic, D., et al. Composites science and technology 60, 1879–1887 (2000). 9. Bin Mohamed Rehan, M. S. Composites structures 161, 1–7 (2017). 10. Bruyneel, et al. Applied Composite Materials 16, 149–162 (2009). 11. Carrella-Payan D., et al. conference fatigue design (2017). 12. Choi N., et al.  Journal of Composite Materials 33, 73–100 (1999).        

Characterization of CFRP mode I and mode II cohesive element parameters for 0//0 and +45//-45 interfaces

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Characterization of CFRP mode I and mode II cohesive element parameters for 0//0 and +45//-45 interfaces

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