9 Now, imagine a slightly “pliant” string, which cross-section diameter being directly proportional to the square root of the distance from the rotation center and which strain inversely proportional to stress in the string, with a very small proportionality coefficient. In this case, substituting the increased value of in the above balance equation provides (16) Here, is the undeformed string length which is different from the real one by a small value that cannot be detected in the scale of solar system. In presence of cosmic force, the term imitates the cosmic force and Eq. (16) a modified equivalence principle. The no annihilation paradox of the present model of cosmic-gravitational field can be understood only after we get known the physical nature of cosmic field. Such a remark is valid also for many non-metric theories of gravity. References [1] G. P. Cherepanov, Crack propagation in continuous media (in Russian), Prikl. Mat. I Mekh. (PMM), v. 31, n. 3, (1967), 476-488. The English translation in: FRACTURE: A Topical Encyclopedia of Current Knowledge (G. P. Cherepanov, Ed.), Krieger Publ., Melbourne, 1998, 41-53. [2] G. P. Cherepanov, Mechanics of Brittle Fracture (in Russian), Nauka, Moscow, 1974. The English translation: McGraw Hill, New York, 1978. [3] G. P. Cherepanov, Fracture Mechanics (in Russian), IKI publ., Izhevsk-Moscow, 2012. [4] G. P. Cherepanov, Some new applications of the invariant integrals of mechanics (in Russian), Prikl. Mat. I Mekh. (PMM), v. 76, n. 5, (2012), 823-849. The English translation: in JAMM. [5] G.P. Cherepanov, Methods of Fracture Mechanics: Solid Matter Physics, Kluwer, Dordrecht, 1997.
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