ON THE ISSUE OF DETERMINING CRITICAL LEVELS FOR THE STABILITY LOSSES IN COMPOSITE MATERIALS

Details

Parent Category: Geo-Technical Mechanics, 2013

Category: Geo-Technical Mechanics, 2013, Issue 109

UDC 539.375: 621.763

Authors:

S.I. Skipochka, D.Sc. (Tech.), Professor,

T.A. Palamarchuk, D.Sc. (Tech.), Senior Researcher,

N.T. Bobro, M.S (Tech.)

(IGTM NAS of Ukraine)

V.P. Kurinnoy, D.Sc. (Tech.), Associate Professor

(SHEE “NMU”)

Abstract.

Strength of fragile materials is reduced with increasing absolute sizes of a body; usually it is explained by the theory of «the weakest link», i.e. by increased probability of dangerous defect occurred in the loaded area resulting in the reduced strength. At the same time, a scale effect can also be explained by an assumption that the accumulated in the volume of body elastic energy transfers to the failure energy on a certain surface. Basing on studying and analysis of properties of structurally heterogeneous bodies, the following parameters were specified as the most informing ones, which can characterize stability of different composite structures: critical value of interlaminar tangent strength; interlaminar shear strength at twisting; ultimate compression strength of the right-angled specimens; the A.K. Malmeyster generalized criterion of strength; probability of structural fracture of composite material elements; probability of joint destruction of two random elements in the composite materials; critical value of stress wave amplitudes; critical value of stress change speed; critical value of stress gradient; and critical value of specific elastic power.

Keywords:

composite materials, criteria of stability, strength, destruction, fracture.

References:

1. Polilov, A. N. (1984), “The explanation of scale effect on the base of energy criterion of the distraction”, Mechanics of solid texture, no.1, pp. 106-110.

2. Rabotnov, JU.N. (1962), Soprotivlenie materialov [Resistance of materials], Fizmatgiz, Moscow, USSR.

3. Kachanov, L.M. (1976), “The distraction of the composite materials by segregation”, Mechanics of  polymers, no.5, pp. 918-922.

4. Slepjan, L.I. (1981) Mechanika trecshin [Mechanic of cracks], Sudostroeniye, Leningrad, USSR.

5. Polilov, A. N. (1983), “The evolution of the segregation at compression of composites”, Proceedings of the AS USSR, s. Mechanics of solid texture, no.4, pp. 166-171.

6. Sokolkin, JU. V. and Tashkinov, A. A. (1984), Mechanika deformirovanija i razrushenija strukturno-neodnorodnykh tel [Mechanic of deformation and destruction of structural-inhomogeneous bodes], Nauka, Moscow, USSR.

7. Malmejster, A.K., Tamuzsh, V.P. and Teters, G.A. (1980), Soprotivlenie polymernykh i kompozitnykh materialov [Resistance of polymeric and composite materials], Zinatne, Piga, Latvia.

8. Goldenblat, I.I., Bazhanov, V.L. and Kopnov, V.A. (1987), Dlitelnaja prochnost i mashinostroenie [Duration strength and machine-building], Mashinostroenie, Moscow, USSR.

9. Rabotnov, JU.N. (1966), Polzuchest elementov konstruktsiy [Creep of constructions elements], Nauka, Moscow, USSR.

10. Melnikov, S.V. and Sokolkin, JU.V. (1981), “The properties fortuity fields conformably to problem of the stochastic inhomogeneous mediums”, Uprugoe i vyazkouprugoe povedenie materialov i constructsy, Sverdlovsk, USSR, pp. 113-118.

11. Sokolkin, JU. V. and Mironovich, L.I., (1990), “About the method of the calculation of structural stress elastomeric composites”, Kraevye zadachi teorii Regional tasks uprugosti i vyazkouprugosti, Sverdlovsk, USSR, pp. 3-19.

12. Kramer, G. (1975), Matematicheskie metody statistiki [Mathematical statistic methods], Mir, Moscow, USSR.

13. Kurinnoy, V.P. (2009), Fіzichnі aspektyruynuvanniagіrskikhporіdvybukhom [Physical aspects of rocks destruction by the explosion], NGU, Dnіpropetrovsk, Ukraine.

About the authors:

Skipochka Sergey Ivanovich, Doctor of Technical Sciences (D. Sc), Professor, Head of Rock Mechanics Department, M. S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, skipochka@ukr.net

Palamarchuk Tatyana Andreevna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Principal Researcher in Rock Mechanics Department, M. S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Bobro Nikolay Trofimovich, Master of Science, Principal Specialist in Rock Mechanics Department, M. S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kurinnoy Vladimir Pavlovich, Doctor of Technical Sciences (D. Sc), Associate Professor, Professor of Physics Department, State Higher Educational Establishment «The National Mining University» of Ukraine (SHEE «NMU»), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

 

 

 

• < Prev
• Next >