Climatic degradation of flat basalt-plastic composites:Limiting porosity values and statistical modeling of pore formation

Reinforced polymer composite materials (PCMs), incorporating diverse fiber types, are extensively utilized across multiple industrial sectors. While PCMs possess acknowledged advantages over conventional materials, empirical evidence indicates that prolonged exposure to extreme climatic conditions induces material ageing, leading to a deterioration of elastic and strength properties. A primary design criterion for PCM components intended for cold-climate applications is a low moisture absorption, a property intrinsically linked to material porosity. This study examines pore formation during the environmental ageing of flat basalt-plastic (BP) composites under extreme northern conditions and estimates threshold porosity values. The identification of these limiting values accounts for the layered structure of BP, which exhibits plane-parallel symmetry. Porosity formation during climatic degradation initiates at the external surface of the composite. In order to describe pore formation mechanisms, a statistical model for the formation of open porosity in flat BPmaterials was developed. The porosity distribution across material layers is treated as a two-dimensional cluster structure on a square lattice. Furthermore, the analysis subsequently identifies coincident elements of these two-dimensional porosity clusters across multiple BP layers (two, three, or more). The outcomes of the evaluative and statistical computations were compared against experimental data derived from studies of open porosity in multilayer BP panels. These panels underwent open-air weathering exposure in the natural climatic environment of Yakutsk. Thus, the developed statistical model for porosity formation in multilayer basalt-plastic composite materials can be applied in the design of PCMs for service inArctic and Subarctic climatic zones.

1. Startsev O.V., Anikhovskaya L.I., Litvinov A.A., KrotovA.S. Increasing the reliability of predicting the properties of po lymer composites in hgrothermal aging. Doklady Chemistry. 2009;428(1):228–232. https://doi.org/10.1134/S0012500809090079

2. Startsev V.O., Molokov M.V., Grebeneva T.A., Tkachuk A.I. Dynamic mechanical and thermomechanical analysis of revers ible plasticization of epoxy-diane resin-diaminodiphenylsulfon system by moisture. Polymer Science, SeriesA. 2017;59(5):640 648. https://doi.org/10.1134/S0965545X17050157

3. Kablov E.N. Structural composite materials. Moscow: VIAM; 2012. P. 58. (In Russ.)

4. Sai Krishna Golla, Prasanthi Р. Prediction of micromechanical behavior of fiber (glass/basalt) reinforced polymer composites. International Research Journal of Engineering and Technology (IRJET). 2016;3(7):1557–1563.

5. Kablov E.N. Innovative developments of FSUE “VIAM” SSC of RF on realization of “Strategic directions of the development of materials and technologies of their processing for the period until 2030. Aviation Materials and Technologies. 2015;1(34):3–33. (In Russ.) https://doi.org/10.18577/20719140-2015-0-1-3-33

6. Pochiraju K.V., Tandon G.P., Schoeppner G.A. Long term durability of polymeric matrix composites. Springer; 2012. P. 677. https://doi.org/10.1007/978-1-4419-9308-3

7. White C.C., White K.M., Pickett L.E. Service life predic tion of polymers and plastics exposed to outdoor weathering. William Andrew Publ; 2017. P. 342.

8. Bhide S.J., Zurale, M.M. Durability aspects of fibre rein forced composites. In: Proceedings of the Eighth International Conference on Durability of Building Materials and Compo nents 8, Vancouver, Canada, May 30–June 3 1999, Ottawa: NRCResearch Press; 1999, pp. 1382–1391.

9. Vodicka R. Environmental exposure of boron-epoxy composite material DSTOTN-0309. Melbourne: DSTO Aero nautical and Maritime Research Lab.; 2000. P. 24.

10. Martin R. Ageing of composites. Cambridge University Press; 2008. P. 544.

11. Nishizaki I., Sakurada H., Tomiyama T. Durability of pultruded GFRP through ten-year outdoor exposure test. Polymers. 2015;7:2494–2503. https://doi.org/10.3390/polym7121525

12. Kablov E.N., Startsev V.O. Systematic analysis of the influence of climate on the mechanical properties of polymer composite materials according to data from domestic and foreign sources. Aviation Materials and Technologies. 2018;(2):47–58. (In Russ.) https://doi.org/10.18577/2071-9140-2018-0-2-40-46

13. Kychkin A.K., Struchkov N.F., Vinokurov G.G. Formation of the porosity of basalt-plastic composite materials during cli matictests under the conditions of the North. Arctic and Sub arctic Natural Resources. 2021;26(1):145–154. (In Russ.) https://doi.org/10.31242/2618-9712-2021-26-1-14

14. Isakaev E.Kh., Mordynsky V.B., Podymova N.B., et al. De termination of porosity of gas-thermal coatings. Physics and Chemistry of Materials Treatment. 2010;(5):71–77. (In Russ.)

15. Tikhonov V.I., Mironov M.A. Markov processes. Moscow: Sovetskoe Radio Publ.; 1977: P. 489. (In Russ.)

16. Tarasevich Yu.Yu. Percolation: Theory, Applications, Algorithms. Moscow: Editorial URSS; 2002. 112 p. (In Russ.)

17. Tyagunov A.G., Milder O.B., Tarasov D.A., Sergeev A.P. Application of artificial neural networks in materials science. Textbook. Ekaterinburg: Ural University Publishing House;2021. 68 p. (In Russ.)