PSI - Issue 50

Kirill Guseinov et al. / Procedia Structural Integrity 50 (2023) 105–112 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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cubic specimens with cut angle α of 15° led to a significant decrease in the interlaminar shear and transversal compressive stresses, and the experimental values were below the failure curve.

Fig. 5. Comparison of the interlaminar shear strength, assessed on cubic and V-shaped specimens with NU-Daniel theory

4. Conclusion In this study, simplified experimental methods for determining the interlaminar shear properties of woven PCMs under through-thickness compression were analysed. Nonlinear shear stress-strain curves under biaxial loading were obtained by testing cubic and V-notched specimens. According to the experimental data, the elastic, deformation and strength shear parameters of the material were evaluated. The experimental data on interlaminar shear strength obtained by two methods were compared with Daniel theory. It was found out that friction had the significant effect on the mechanical response when testing cubic specimens. In this case, the shear stress-strain curves do not reflect the actual material behaviour under combined loading, while the stress-strain diagrams obtained when testing V-notched specimens on the new fixture can be used to develop and verify numerical materials models. At the same time, it was shown that the correct assessment of the interlaminar shear strength could be obtained on both types of specimens. Acknowledgements This research was funded by the Russian Science Foundation, project No. 18-19-00377. References Tarnopol’skii, Y.M., Zhigun, I.G., V. A. Polyakov, 1992. Spatially Reinforced Composites. Technomic Publ. Co. Inc., Lancaster, Pa, pp. 352. DeTeresa, S.J., Freeman, D.C., Groves, S.E., 2004. The effects of through-thickness compression on the interlaminar shear response of laminated fiber composites. Journal of Composite Materials, 38, 681-697. Guseinov, K., Kudryavtsev, O.A., Sapozhnikov, S.B., 2021. Effectiveness of 2-D and 3-D modelling of dovetail joint of composite fan blade for choosing rational reinforcement schemes. PNRPU Mechanics Bulletin 1, 5-11. Anoshkin, A.N., Tashkinov, A.A, 1998. Prognozirovanie nesushchej sposobnosti kompozitnyh flancev korpusnyh detalej aviadvigatelej. Izd-vo PGTU, Perm', pp. 101. Anoshkin, A.N., Tashkinov, A.A., 1997. Nonsteady-state damage accumulation processes in composite flanges under cyclic loads. Mechanics of Composite Materials, 33(5), 449-454.