Predicting inelastic deformation and failure of laminated composites

Wildemann, V. E.; Sokolkin, Yu. V.; Tashkinov, A. A.

doi:10.1007/bf00604912

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…The obtained analytical solutions ( 7) and ( 8) can be used to analyze weight forces to the stress states of solid-cast reinforced working supports of underground spherical and level cylindrical mine workings. We can also assess the initial strength of these facilities by the set of criteria [1].…”

Section: Estimation Of the Initial Strengthmentioning

confidence: 99%

“…Therefore, these materials demonstrate natural anisotropy of strength and deformation properties under loading. The refine strength analysis of cylindrical and spherical structures and facilities located at rocks or sedimentary rocks should be carried out on the basis of the multicriteria approach [1], considering various mechanisms of partial or complete loss-of-strength, which is characteristic for anisotropic damaged media. This approach can also be used to estimate the stress state for horizontal oil wells, to determine the conditions for their safe operations in order to maximize the carrying capacity reserves.…”

Section: Introductionmentioning

confidence: 99%

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Initial strength analysis of reinforced concrete monolithic supports for spherical and cylindrical mine workings

Зайцев

Kutergin

Фукалов

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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By using decomposition of hoop and radial components of the displacement vector to the trigonometrical and generalized power series, we obtained the new exact analytical solutions to problems of the equilibrium state of thick-walled heavy anisotropic central-and axial-symmetric bodies fixed on their external surfaces and subject to uniform internal lateral pressure. The estimation of an initial strength of cylindrical and spherical reinforced concrete monolithic mine working supports for a long-term storage of gas and oil is carried out on the basis of a multicriteria approach taking into account real damage mechanisms. They include damage from tension or compression in radial, hoop and axial directions, and from transversal and antiplane shear) of anisotropic axial- and central-symmetric bodies.

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Section: Estimation Of the Initial Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Initial strength analysis of reinforced concrete monolithic supports for spherical and cylindrical mine workings

Зайцев

Kutergin

Фукалов

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…This work considers the failure as a result of the stability loss of inelastic deformation processes [9][10][11][12]. The theoretical and experimental study of the basic laws of post-critical deformation makes it possible to predict conditions of destruction of deformable bodies and analyze possibilities for controlling destruction.…”

Section: Introductionmentioning

confidence: 99%

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

Tretyakova

Tretyakov

2023

Metals

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This work is devoted to the study of the influence of the rigidity of the loading system on the kinetics of the initiation and propagation of the Portevin-Le Chatelier (PLC) strain bands due to the jerky flow in Al-Mg alloy. To estimate the influence of the loading system, the original loading attachment, which allows reducing the stiffness in a given range, was used. Registration of displacement and strain fields on the specimen surface was carried out with the Vic-3D non-contacting deformation measurement system based on the Digital Image Correlation (DIC) technique. The mechanical uniaxial tension tests were carried out using samples of Al-Mg alloy at the biaxial servo-hydraulic testing system Instron 8850. As a result of tensile tests, deformation diagrams were obtained for Al-Mg alloy samples tested at different values of stiffness of the loading system: 120 MN/m (nominal value), 50 MN/m, 18 MN/m, and 5 MN/m. All diagrams show discontinuous plastic deformations (the Portevin-Le Chatelier effect). It is noted that a decrease in the rigidity of the loading system leads to a change in the type of jerky flow. At constant parameters of the loading rate, temperature, and chemical composition of the material, the PLC effects of types A, B, and C are recorded in tests.

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“…By default, constraints are introduced, which specify the material's model and follow a well-known Drucker's postulate. But, as a result, there remains a large portion of deformation properties which go unaccounted for and relate to manifestation of the stage of material softening in structural elements [1][2][3]. Factoring in the softening as a new property of a material precedes studying the fracture as a new phenomenon noted in the behavior of a structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Strain-Softening Stage in Materials

Миронов

Lukashuk

Каманцев

2019

MSF

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Physical theory of reliability is based on research into degradation processes of various origins which take place in a material of a stressed construction. Experimental evaluation of parameters carried out for such processes is a practically important problem by itself. One of the approaches to solving this problem is related to the studies into the stage of material softening due to deformation. This paper analyzes the issues of experimental validation of material softening properties in terms of a phenomenological approach to the problem of structural fracture. Results of deformation analysis for the “machine – model specimen” system, using catastrophe theory are used to form requirements for carrying out experiments which investigate the softening stage of materials. The success of such experiments – which should include recording a branch descending to zero on a computer diagram – is possible when small specimen, made from structurally heterogeneous materials, are strained in a sufficiently rigid testing machine. Thus, the conditions for manifestation of the softening stage connect properties of the material with properties of the load-applying system. Therefore, the material's limiting state – preceding the fractured – also depends on the conditions of loading, and the criteria of that fracture would be nonlocal. In consideration of the results of diagrams plotted from various bases for deformation measurement, a necessity of utilizing local material characteristics for calculation purposes is discussed. As an example of using the complete diagrams for determining kinetics of material degradation from external load, the results of specimen testing, which follows a cyclic training, are cited.

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Predicting inelastic deformation and failure of laminated composites

Cited by 7 publications

References 1 publication

Initial strength analysis of reinforced concrete monolithic supports for spherical and cylindrical mine workings

Initial strength analysis of reinforced concrete monolithic supports for spherical and cylindrical mine workings

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

Experimental Study of Strain-Softening Stage in Materials

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