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http://earchive.tpu.ru/handle/11683/74811
Название: | Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete |
Авторы: | Shilko, Evgeny Viktorovich Konovalenko, Igor Sergeevich Konovalenko, Ivan Sergeevich |
Ключевые слова: | бетон; пористость; проходимость; фильтрация; динамическая нагрузка; прочность на сжатие; компьютерное моделирование; water-saturated concrete; two-scale porosity; permeability; fluid filtration; dynamic loading; fracture; compressive strength; computer simulation; discrete element method; coupled poroelastic model |
Дата публикации: | 2021 |
Издатель: | MDPI AG |
Библиографическое описание: | Shilko, E. V. Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete / E. V. Shilko, I. S. Konovalenko, I. S. Konovalenko // Materials. — 2021. — Vol. 14, iss. 14. — [4011, 34 p.]. |
Аннотация: | It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1 < ε˙ < 100 s−1) is also characterized by the presence of a peculiar mechanism of interstitial water effect on the concrete fracture and compressive strength. Using computer simulations, we have shown that such a mechanism is the competition of two oppositely directed processes: deformation of the pore space, which leads to an increase in pore pressure; and pore fluid flow. The balance of these processes can be effectively characterized by the Darcy number, which generalizes the notion of strain rate to fluid-saturated material. We have found that the dependence of the compressive strength of high-strength concrete on the Darcy number is a decreasing sigmoid function. The parameters of this function are determined by both low-scale (capillary) and large-scale (microscopic) pore subsystems in a concrete matrix. The capillary pore network determines the phenomenon of strain-rate sensitivity of fluid-saturated concrete and logistic form of the dependence of compressive strength on strain rate. Microporosity controls the actual boundary of the quasi-static loading regime for fluid-saturated samples and determines localized fracture patterns. The results of the study are relevant to the design of special-purpose concretes, as well as the assessment of the limits of safe impacts on concrete structural elements. |
URI: | http://earchive.tpu.ru/handle/11683/74811 |
Располагается в коллекциях: | Репринты научных публикаций |
Файлы этого ресурса:
Файл | Описание | Размер | Формат | |
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reprint-nw-39383.pdf | 9,05 MB | Adobe PDF | Просмотреть/Открыть |
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