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1.
With the use of an analytical approach developed, the influence of distribution of a tangential load on the stress concentration
in uniaxially tensioned flat specimens of high-strength unidirectional composites near the grips of a testing machine is evaluated.
In view of singularity of the analytical solution derived at the points of discontinuity of boundary conditions, for estimating
the stress concentration, it is suggested to employ the averaged value of longitudinal stresses, which is calculated by means
of an improper integral across the thickness of a near-surface layer.
__________
Translated from Mekhanika Kompozitnykh Materialov, Vol. 42, No. 6, pp. 787–796, November–December, 2006. 相似文献
2.
A method is proposed for evaluating the resistance of a flywheel rim to radial stresses in free rotation. The method is based on loading a rim segment in pure bending and calculating the limiting moment and the corresponding limiting angular velocity. Applicability of the method is substantiated theoretically by investigating the similarity of the radial stress diagrams in rotation and pure bending. The method is verified experimentally for the strained state of a rim segment in pure bending.Translated from Mekhanika Kompozitnykh Materialov, Vol. 29, No. 4, pp. 521–526, July–August, 1993. 相似文献
3.
4.
A set of invariants describing the limit regimes of braking disk-type wound composite flywheels is suggested. The limit regime is determined by using a linear failure criterion. It is shown that, for generating short-time impulses of very high power, a set of small identical flywheels is more effective than one large flywheel with an equivalent mass. Particular examples illustrating the theory considered are discussed. 相似文献
5.
A. N. Kost L. A. Sviridova G. A. Golubeva Yu. N. Portnov 《Chemistry of Heterocyclic Compounds》1970,6(3):344-348
The opening of the pyrazolidine ring at the nitrogen-nitrogen bond in 1-arylpyrazolidine under the influence of acidic agents which leads to the formation of N-(3-aminoalkyl)indoles is described. The method enables one to obtain indoles with branched aminoalkyl radicals.For part XIII see [1]. 相似文献
6.
V. G. Voronin S. B. Goncharenko A. I. Ermakov Yu. N. Portnov 《Chemistry of Heterocyclic Compounds》1976,12(4):443-448
The mass spectra of 2- and 4-thiobarbituric acids and some of their close analogs at ionizing voltages of 70 and 14 eV are compared. Qualitative and quantitative differences in the behavior of these compounds under the influence of electron impact were established. It is shown that the position of the thione group in the ring and the tautomeric transformations have a substantial effect on the character of the fragmentation of the investigated compounds. The established fragmentation principles make it possible to distinguish the structural isomers in a series of 2- and 4-thiobarbituric acids from their mass spectra.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 529–535, April, 1976. 相似文献
7.
G. A. Golubeva Yu. N. Portnov A. N. Kost L. A. Sviridova 《Chemistry of Heterocyclic Compounds》1971,7(1):110-113
Conditions were worked out for the synthesis of a number of 1-arylpyrazolidines with alkyl groups in the 4 and 5 positions of the five-membered ring by reduction of the corresponding 3- or 5-pyrazolidones with lithium aluminum hydride.See [1, 2] for communications XLVI And XLVII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 118–121, January, 1971. 相似文献
8.
9.
A. N. Kost G. A. Golubeva V. G. Zabrodnyaya Yu. N. Portnov 《Chemistry of Heterocyclic Compounds》1975,11(12):1383-1386
3,3-Disubstituted 2-iminoindolines and the corresponding 10,10-disubstituted tetrahydropyrimido-[1,2-a] indoles, including compounds with spiran structures, were synthesized by reaction of 1-phenyl-2-acylhydrazines and l-phenyl-2-acylpyrazolidines geminally substituted at the-carbon atom of the acyl residue with phosphorus oxychloride. An instance of cleavage of the methyl group was detected.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1632–1635, December, 1975. 相似文献
10.
The authors discuss the deformative susceptibility of a ring made of spirally arranged armature layers and a polymer binder. They show that in prolonged stress on these rings by internal pressure under conditions of a highly pliable matrix additional deformation may occur, caused by sliding of the coils. 相似文献