PSI - Issue 28

N.A. Sazhenkov et al. / Procedia Structural Integrity 28 (2020) 1572–1578 N.A. Sazhenkov et al./ Structural Integrity Procedia 00 (2019) 000–000

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bending vibration mode after the impact. These results indicate the ability of the polyurea coating on the front surface to redistribute the load upon impact with the projectile on a large surface of the GFRP plate compared to the case when the coating is not presented. A larger volume of GFRP is involved in the absorption of the kinetic energy of the projectile. In contrast to the case of an uncoated plate, delocalization of the fracture process takes place. This increases the ballistic limit. The part of energy that is spent on elastic deformation increases, and the elastic bending of the sample increases. This was observed in the video. 4. Conclusion The present experimental study has confirmed that the protective properties of the polyurea coating described in the literature in relation to metal plates under explosive and shock loading are also manifested in the case of impact on layered polymer composites. The 1.2 mm thick protective polyurea coating applied to the front surface allowed to increase the ballistic limit of the sample by 19% with an increase in its areal density by only 6.7%. Polyurea coating prevents the penetration of the plates due to the ability to exclude the localization of fracture upon impact due to the redistribution of the load. This effect makes it promising to use polyurea coatings for impact protection of laminated composite materials. The obtained experimental data can be used to verify the numerical models of the impact damage of layered polymer composite materials with polyuria coating. Acknowledgement The reported study was partially supported by the Government of Perm Krai, research project No. С -26/790 from 21.12.2017 References 1. Davidson J.S, Fisher J.W, Hammons M.I, Porter J.R, Dinan R.J. Failure mechanisms of polymer-reinforced concrete masonry walls subjected to blast. J. Struct. Eng. 2005; v.131, №1, pp.194 -205. 2. Szafran J. Matusiak A. Polyurea coating systems: definition, research, applications. XXII LSCE –2016 Monograph from Scientific Seminar, 2016 . 3. Iqbal N., Sharma P.K., Kumar D., Roy P.K. Protective polyurea coatings for enhanced blast survivability of concrete. Construction and Building Materials. 175 (2018) 682–690. 4. Amini M.R., Isaacs J.B., Nemat-Nasser S.. Experimental investigation of response of monolithic and bilayer plates to impulsive loads. International Journal of Impact Engineering 37 (2010) 82–89 5. Amini M.R., Simon J., Nemat-Nasser S. Numerical modeling of effect of polyurea on response of steel plates to impulsive loads in direct pressure-pulse experiments. Mechanics of Materials 42 (2010) 615–627 6. Dai L., Wu ,.An F, Liao S. Experimental investigation of polyurea-coated steel plates at underwater explosive loading, Advances in Materials Science and Engineering Volume 2018, Article ID 1264276, p.1-7 7. Ackland, K., Anderson, C. & Ngo, T. (2013). Deformation of polyurea coated steel plates under localised blast loading. International Journal of Impact Engineering, Vol. 51, pp. 13-22. 8. Bahei-El-Din Y.A., Dvorak G.J., Fredricksen O.J. A blast-tolerant sandwich plate design with a polyurea interlayer. International Journal of Solids and Structures 43 (2006) 7644–7658 9. Tekalur S.A., Shukla A., Shivakumar K. Blast resistance of polyurea based layered composite materials. Composite Structures 84 (2008) 271–281. 10. LeBlanc J., Shukla A. Response of polyurea-coated flat composite plates to underwater explosive loading. Journal of Composite Materials. V.49, issue: 8, 2014, pp.965-980 11. Xue L., Mock Jr.W., Belytschko T. Penetration of DH-36 steel plates with and without polyurea coating. Mechanics of Materials 42 (2010) 981–1003. 12. Cai L., Al-Ostaz A., Li X., Fowler C., Cheng A., Alkhateb H. Protection of steel railcar tank containing liquid chlorine from high speed impact by using polyhedral oligomeric silsesquioxane-enhanced polyurea. International Journal of Impact Engineering 75 (2015) 1-10 13. Mohotti D., Ngo T., Raman S.N., Ali M., Mendis P. Plastic deformation of polyurea coated composite aluminum plates subjected to low velocity impact. Materials & Design. Volume 56, 2014, Pp. 696-713 14. Mohotti D., Ngo, Tuan R., Sudharshan N., Mendis P. Analytical and numerical investigation of polyurea layered aluminium plates subjected to high velocity projectile impact. Materials and Design 82 (2015) pp. 1-17.