Probabilistic model of the strength, crack resistance, and fatigue life of a unidirectionally reinforced fibrous composite

Sokolkin, Yu. V.; Postnykh, A. M.; Chekalkin, A. A.

doi:10.1007/bf00613319

Cited by 6 publications

(3 citation statements)

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“…In the future, it is planned to examine the structure of the rock mass in detail, its thermal and mechanical properties, the speed and temperature of water inflows in order to determine more accurately the formation time of frozen rock massif of required thickness. Due to the fact that the rock massif is a complex composite material [6,7], it is planned to improve the calculation model, which will take into account both a complex distribution of temperature and its effect on the stress-strain behavior of rocks, the reliability and durability of the lining [8], and the formation and evolution of cracks [9], using the methods and approaches of the mechanics of composite materials.…”

Section: -2mentioning

confidence: 99%

The application of numerical modeling to problems of thermal effects and phase transition in rock massifs

Suleymanov¹,

Chekalkin²

2016

AIP Conference Proceedings

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Section: -2mentioning

confidence: 99%

The application of numerical modeling to problems of thermal effects and phase transition in rock massifs

Suleymanov¹,

Chekalkin²

2016

AIP Conference Proceedings

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“…В результате материал имел большое количество макродефектов, что могло привести к значительной неоднородности и снижению физико-механических характеристик [10]. Кроме того, при получении УУКМ (в ходе карбонизации углепластика) под воздействием температуры происходят процессы, связанные с усадкой матрицы, что выражается в образовании большого количества усадочных трещин [11].…”

Section: реализация процесса конденсации паров кремния в порах уукм сunclassified

Development of a combined method of siliconising of large-sized CCCM product based on alternative liquid-phase method and process of capillary condensation of silicon vapours

Bushuev¹,

Lunegov²,

Бушуев³

2015

PNRPU Aerospace Engineering Bulletin

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The features of the combined method of siliconising large-sized blanks of the carbon-carbon composite material (CCCM) is described. Its essence is the combination of alternative liquid-phase method, where the precursor of liquid silicon is silicon nitride, and vapor-liquid-phase method, which consists in evaporation of silicon and subsequent condensation of its vapors in the pores of the material blank. Positive results of volumetric siliconising is provided by the process of capillary condensation of silicon vapours in the 1300-1550 ºС temperature range in the presence of a temperature difference between the temperature of the silicon vapor and the temperature of the blank. Samples of carbonsilicon carbide material with a high degree of siliconising and high surface finish is obtained in two stages by the combined method of siliconising. The first stage is the process of capillary condensation of silicon vapours in heater providing a higher temperature in the crucible with silicon as compared with the temperature at siliconized bulk. The second stage is the process of impregnation of the material with liquid silicon, formed by the decomposition of silicon nitride in the heater with uniform temperature distribution along its height.

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“…In the future, it is planned to examine the structure of the rock mass in detail, its thermal and mechanical properties, speed and temperature of water inflows to more accurate determining the formation time of frozen rock massif of required thickness. Due to the fact that the rock massif is a complex composite material [6,7], it is planned to improve the calculation model which will take into account both a complex distribution of temperature and its impact on stress strain behavior of rocks, the reliability and durability of the lining [8], and formation and development of cracks [9], using the methods and approaches of the mechanics of composite materials.…”

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confidence: 99%

Mathematical Modeling of Frozen Rock Massif Formation During the Shaft Deepening

Suleimanov¹,

Chekalkin²,

Khronusov³

2017

dtetr

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ABSTRACT The paper deals with the formation a mathematical modeling of heat transfer at the freezing well effect on the rock massif during the shaft deepening. The dynamics modeling of the temperature field around the shaft was made in the application package «ANSYS». The approximate formation time of the frozen rock massif of desired thickness, which is necessary for sinking the shaft, was determined.The construction of underground facilities, including vertical shafts, is a knowledge and resource-intensive process. It requires tackling many problems related to safety in the construction and subsequent operation of the facilities. The influence of various factors, such as: loss of stability, the impact of heavy water inflows [1], and others -may result in destructing of the excavation walls. It is well known that brittle materials, such as rocks and concrete, contain pre-existing micro-cracks [2], which significantly affect their behaviour. Rock masses are generally discontinuous in nature, and contain fractures (joints) with corresponding spacing and rock bridges, which play an important role in the strength of a rock formation. The propagation and coalescence of cracks initiating from such pre-existing defects, on a variety of scales, are the dominant failure mechanisms controlling the strength and integrity of brittle materials. A rock mass is not necessarily a continuous medium, nor a totally discrete medium but a kind of defect material which contains cracks, joints and faults. The nonlinear deformation behaviour of a rock mass is induced by the propagation and coalescence of cracks and joints under the external loads.The paper deals with the Talitsky area of Verkhnekamsky deposit. This area is characterized by a complex structure and the presence of several aquifers. The freezing method was proposed to ensure safe penetration and protection from blur and soil destruction [3].The preliminary time of the active freezing to form the frozen rock fence of 6.2m thickness (δ) and the shaft diameter 9m had been calculated before the start of shaft excavation. The calculation of the active rock freezing duration, according to the project documentation, is performed by the rate of frozen rock fence increase, which

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Probabilistic model of the strength, crack resistance, and fatigue life of a unidirectionally reinforced fibrous composite

Cited by 6 publications

References 0 publications

The application of numerical modeling to problems of thermal effects and phase transition in rock massifs

The application of numerical modeling to problems of thermal effects and phase transition in rock massifs

Development of a combined method of siliconising of large-sized CCCM product based on alternative liquid-phase method and process of capillary condensation of silicon vapours

Mathematical Modeling of Frozen Rock Massif Formation During the Shaft Deepening

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