Creep of Composite Materials and Mathematical Interpretation of Experimental Studies Results

The results of the study of the ability of the material to deform in time under the influence of constant loads are presented. Wood and plastics based on it are considered as elastic-visco-plastic materials. For these materials, it can be assumed that under the action of a constant load, the following is characteristic: creep deformation under the load not exceeding a certain value (even the limit of long-term resistance) is asymptotic and reversible, and the destruction of the material does not occur; when the load exceeds this limit, creep leads to the destruction of the material, creep deformation is not completely reversible and has a continuous nature; the strength of the material varies significantly over time; under the action of a constant given strain, there is a decrease in stress over time (relaxation). A detailed analysis of the positive properties and disadvantages of polymer concrete is given. Disadvantages of polymer concrete were revealed when studying their mechanical properties, in particular, their long-term strength. As a result of development of the structure formation theory, improvement of technology, improvement of methods of experimental research, it is unambiguously established that polymer concretes have damping creep at all ways of loading though when tensioning and bending they are rather big.

B.A. BONDAREV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
T.N. STORODUBTSEVA², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Lipetsk State Technical University (30, Moskovskaya Street, Lipetsk, 398055, Russian Federation)
² Voronezh State University of Forestry and Technologies named after G.F. Morozov (8, Timiryazeva Street, Voronezh, 394087, Russian Federation)

1. Aleksandrov A.V., Potapov V.D., Derzhavin B.P. Soprotivlenie materialov [Strength of materials]. Moscow: Higher school. 1995. 560 p.
2. Belyankin F.P., Yacenko V.F. Deformativnost’ i soprotivlyaemost’ drevesiny kak uprugo-vyazkoplasticheskogo tela [Deformability and resistance of wood as an elastic – viscoplastic body]. Kyiv: Publishing house of USSR Academy of Sciences. 1997. 198 p.
3. Yacenko V.F. Prochnost’ i polzuchest’ sloistyh plastikov [Strength and creep of laminates (compression, tension, bending)]. Kyiv: Naukova Dumka. 1966. 204 p.
4. Ivanov A.M. Structural diagrams of polymers and plastics used in construction. Creep of building materials and structures. Sb. TSNIISK: 1964. No. 218, pp. 41–44. (In Russian).
5. Bazhenov Yu.M. Tekhnologiya betona [Concrete technology]. Moscow: ASV. 2003. 500 p.
6. Bondarev B.A., Harchevnikov V.I., Storodubceva T.N., Komarov P.V. Dolgovechnost’ kompozicionnyh materialov na osnove othodov drevesiny v konstrukciyah special’nogo naznacheniya / Pod red. V.I. Harchevnikova [Durability of composite materials based on wood waste in special purpose structures]. Lipetsk : LGTU. 2007. 200 p.
7. Rzhanicyn A.R. Nekotorye voprosy mekhaniki sistem, deformiruyushchihsya vo vremeni [Some questions of mechanics of systems deforming in time]. Moscow: Gostehizdat. 1969. 252 p.
8. Bykovskij V.N. Soprotivlyaemost’ materialov vo vremeni s uchetom statisticheskih faktorov [The resistance of materials over time, taking into account statistical factors]. Moscow: State construction. 1958. 124 p.
9. Leont’ev N.L. Uprugie deformacii drevesiny [The elastic deformation of the wood]. Leningrad: Goslesbumizdat. 1952. 120 p.
10. Ivanov A.M. Calculation of wooden structures taking into account the duration of the load. Proceedings of the Voronezh Institute of civil engineering. No. 6, pp. 11–18. (In Russian).
11. Ivanov A.M., Potapov Yu.B., Alimov S.A. Ob uravnenii nelinejnoj polzuchesti nekotoryh plastmass I drevesiny // Izv. vuzov. Stroitel’stvo i arhitektura. 1968. No. 6, pp. 13–20. (In Russian).
12. Ivanov A.M. Issledovanie prochnosti i deformativnosti drevesiny [Study of strength and deformability of wood]. Moscow: Stroizdat. 1956. 218 p.
13. Kvasnikov E.N. Voprosy dlitel’nogo soprotivleniya [Long-term resistance issues]. Leningrad: ILS, LISI. 1972. 96 p.
14. Ryb’ev I.A. Stroitel’nye materialy na osnove vyazhushchih veshchestv [Building materials based on binders]. Moscow: Higher school. 1978. 309 p.
15. Harchevnikov V.I. Fundamentals of structure formation of fiberglass polymer concrete. Izv. vuzov. Stroitel’stvo i arhitektura. 1987. No. 11, pp. 62–66. (In Russian).
16. Calculations and application of structures hermopolitan in construction. Guide. Moscow: Ministry of nonferrous metallurgy of the USSR. 1975. 235 p.
17. Manual for the design and manufacture of tank equipment from hermopolitan. Moscow: MCM SOVIET UNION. 1979. 94 p. (In Russian).
18. Ivanov A.M., Potapov Yu.B. Structural diagram of furfuraceous plastbeton compression. Mekhanika polimerov. 1968. No. 3, pp. 454–461. (In Russian).
19. Potapov Yu.B., Zalan L.M. The creep of the resin plastobeton PHAM compression. Beton i zhelezobeton. 1965. No. 9, pp. 31–32. (In Russian).
20. Zalan L.M. Comparative data on creep sandy plastobeton on monomer FA and FAM. Plastmassa v stroitel’stve na zheleznodorozhnom transporte. 1966, pp. 49–54. (In Russian).
21. Belyaev V.E., Kobelev M.I., Lomuhin V.A. Strength and deformability of steel-plastic beams and plates under long-term action of constant load. Beton i zhelezobeton. 1968. No. 7, pp. 23–24. (In Russian).
22. Stalepolimernye stroitel’nye konstrukcii [Steelpolymer building structures]. Edited by S.S. Davydov and A.M. Ivanov. Leningrad: Stroyizdat. 1972. 200 p.
23. Bobryshev A.N. Long-term strength of composite materials at low stresses and high temperatures. Durability of building materials and structures. Theses of International Science Conference. 1995. 96 p. (In Russian).
24. Zhurkov S.I., Narzulaev B.N. Time dependence of the strength of solids. Journal of technical physics. 1963. Vol. 23, Iss. 10, pp. 1–9. (In Russian).
25. Prochnost’ i deformativnost’ konstrukcij s primeneniem plastmass [The strength and deformability of structures with the use of plastics]. Ed. A. B. Gubenko. Moscow: Stroizdat. 1966. 296 p.
26. Bartenev G.M., Zuev Yu.S. Prochnost’ i razrushenie vysokoelasticheskih materialov [Strength and fracture of highly elastic materials]. Moscow: Chemistry. 1964. 387 p.