Material testing by plotting total deformation curves

Wildemann, V. E.; Tretyakov, M. P.

doi:10.3103/s1052618813010159

Cited by 12 publications

(3 citation statements)

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“…Thus, the ultimate strength is determined by the deformational abilities of the matrix before the appearance of the neck (exhaustion of the ability to a uniform plastic deformation) and relative elongation by the intensive variation of shapes of pores and microdefects. 22 …”

Section: Discussionmentioning

confidence: 99%

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Maruschak

Бищак

Prentkovskis

et al. 2016

Advances in Mechanical Engineering

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Mechanical properties are substantiated, that are the most vulnerable to maintenance material deterioration of under prolonged operating time, accompanied by intense damage. The opposite behavior of relative elongation and contraction indicates the intensity of scattered damage of the operated metal. Reducing the percentage reduction indicates operational metal embrittlement, as a result of strain hardening, which can serve as confirmation of the increase in hardness and microhardness. Fractographic analysis of failure mechanisms of steel 17G1S cut in the length and breadth of the pipe is implemented.

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Section: Discussionmentioning

confidence: 99%

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Maruschak

Бищак

Prentkovskis

et al. 2016

Advances in Mechanical Engineering

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“…Такой подход позволяет выявить момент начала разрушения тела. Однако возможны условия, при которых по мере развития процесса разрушения конструкции способны сохранять несущую способность за счет дополнительных прочностных и деформационных резервов [1][2][3][4][5]. В связи с этим актуальным является исследование процессов деформирования и разрушения твердых тел, сопровождающихся равновесным накоплением повреждений.…”

Section: Introductionunclassified

Аспекты Численного Моделирования Процессов Разрушения Упруго-Хрупких Тел

Вильдеман,

Феклистова,

Мугатаров

et al. 2023

Comp. Contin. Mech.

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Understanding the nucleation and evolution of microdefects in solid bodies is important to ensure the reliability and safety of critical structures and to identify their strength and deformation resources. In numerical modeling, failure zones can be represented as areas with significantly underestimated rigid characteristics by analogy with the method of variable elastic parameters used in solving the boundary-value problems of the theory of plasticity. However, the formal application of numerical algorithms of plasticity does not always lead to an adequate description of failure processes especially in elastic-brittle bodies. This paper considers some aspects of the numerical simulation of failure processes, such as the calculation of a stress-strain state after reducing the rigidity of finite elements under constant boundary conditions by organizing an appropriate iteration procedure, and the selection of the maximum number of finite elements fractured per iteration, the value of a loading step, and the discretization degree of the computational domain. The influence of the above aspects on the results of failure simulation is illustrated by comparing the numerical solutions to the problem of deformation of the strip made of elastic-brittle material with the edge stress concentrator, which were obtained by different algorithms. The loading diagrams were plotted, and the implementation of the post-critical stage at the macro level was demonstrated. Failure kinetics was analyzed for different variants of implementation of the iterative procedure and at a variable number of elements fractured per iteration. It has been found that, in order to get an accurate description of deformation and failure processes, the automatic selection of a loading step seems to be more reasonable. Analysis has indicated that the discretization degree of the computational domain has a strong impact on the modeling results. This suggests that the finite element size should correspond to a certain strength constant of a material having the dimensions of length.

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“…Она основана на применении методов математической теории катастроф [3,4]. Реализация данного подхода возможна, если вводить в рассмотрение неустойчивые состояния материала покрытия (разупрочнение), которые характеризуются падающей ветвью диаграммы деформирования [5][6][7][8][9][10]. При этом разрушение трактуется как невозможность равновесия [11].…”

Section: Introductionunclassified

Destruction of a protective pipe coating under cyclic loading by internal pressure

Struzhanov¹,

Chaikin²

2022

DREAM

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An analytical method has been developed for determining the moment of destruction of thin pipe coatings whose material retains elasticity during cyclic changes in internal pressure. The coating material has the property of strain softening, that is, destruction with increasing deformation occurs as stresses drop. The properties of the coating material are described by a convex-concave potential. Due to damage accumulation resulting from fatigue loading, the properties of the coating material change. Hence, the complete deformation curve degenerates. To determine the moment of destruction, the methods of the mathematical theory of catastrophes are used, which make it possible to find all the equilibrium positions of the system and the point of instability of the deformation process. Due to the degeneration of the properties of the coating material, the catastrophe (loss of stability) approaches the parameters of fatigue loading.

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Material testing by plotting total deformation curves

Cited by 12 publications

References 1 publication

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Аспекты Численного Моделирования Процессов Разрушения Упруго-Хрупких Тел

Destruction of a protective pipe coating under cyclic loading by internal pressure

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