Numerical simulation of deformation behavior of aluminum alloy sheets under processing by groove pressing method

The results of theoretical estimation of capabilities of the material structure modification of 1560 aluminum alloy sheets under processing by severe plastic deformation are presented in this paper. Severe plastic deformation of flat specimens is effected by the constrained groove pressing method in original dies with trapezoidal teeth. The numerical simulation results of the sheet specimen treatment process by severe plastic deformation were used for dies designing. The stress-strain state of flat aluminum alloy specimens and the steel dies at high processing temperature, support reaction force during pressing and the degrees of plastic strain accumulation at the optimum mode of pressing were estimated. The main numerical result is the value of accumulated plastic strain in the specimen per one pressing cycle which is about 1.14. Large degrees of strain are the reasons of grain structure and material texture changes, which leads to inevitable change of its physical-mechanical properties. Increasing the number of pressing cycles leads to proportional increase of the degree of accumulated plastic strain

Investigation of the Stress-Strain State of Crane Beams in Normal Operating Modes

Представлены результаты конечно-элементного исследования напряженно- деформированного состояния подкрановых балок в штатных режимах эксплуатации при отсутствии усталостных трещин, дефектов и повреждений. По результатам проведенных расчетов получены данные распределения интенсивности напряжений и компонент тензора напряжений, возникающих в верхней зоне стенки подкрановой балки по ее длине при различных величинах эксцентриситета нагружения, обусловленного смещением рельса от вертикальной оси сечения балки. Установлены закономерности напряженно- деформированного состояния стенки балки от ряда факторовThe results of finite element studies of the stress-strain state of crane beams in normal operating modes in the absence of fatigue cracks, defects and damages are presented. The distributions of the stress intensity and the component of stress tensor, arisen in the upper zone of crane beams wall along its length under different values of the eccentricity of load, caused by the rail shift from the vertical axis of the beam section, were obtained on the basis of performed calculations. The regularities of stress-strain state of beam wall by a number of factors were determine

Characteristic features of physical and mechanical properties of ultrafine-grained Al–Mg alloy 1560

Specimens of Al–Mg alloy 1560 of ultrafine-grained structure were obtained by the method of severe plastic deformation based on multiple equal-channel angular pressing. Impact on physical and mechanical properties of the processed material and fracture pattern of specimens was studied. Tensile tests showed an increase of the offset yield strength and resistance to rupture with decrease in the ultimate deformation. The obtained specimens have increased microhardness values compared to the initial ones. It was established that the last cycle of pressing determines the structural orientation of macroscopic shear bands occurring at an angle to the specimen longitudinal axis while passing connection of channels. It affects the physical and mechanical properties of the material and fracture pattern. The quality control of the obtained specimens by the method of ultrasonic defectoscopy and X-ray tomography confirmed the absence of macroand microdefects when following the matched optimal regime of processing

Influence of Cooling Rate on the Failure Mechanisms of Protective Oxide Layers on Ni-Based Alloys After the High-Temperature Oxidation

Проведен сравнительный анализ микроструктуры оксидных слоев, формирующихся при высокотемпературном изотермическом окислении (T = 1000 °C, 50 ч) на поверхности промышленных монокристаллических сплавов на основе никеля. Установлено влияние скорости охлаждения на состояние границы раздела металл/оксид и механизмы разрушения оксидных слоевA comparative analysis of the microstructure of protective oxide layers formed during high temperature isothermal oxidation (T = 1000 °C, 50 h) of commercial Ni-based single crystal alloys was carried out. The effect of cooling rate on the integrity of the metal/oxide interface and the damage behavior of oxide layers was establishe

Numerical simulation of deformation behavior of aluminum alloy sheets under processing by groove pressing method

The results of theoretical estimation of capabilities of the material structure modification of 1560 aluminum alloy sheets under processing by severe plastic deformation are presented in this paper. Severe plastic deformation of flat specimens is effected by the constrained groove pressing method in original dies with trapezoidal teeth. The numerical simulation results of the sheet specimen treatment process by severe plastic deformation were used for dies designing. The stress-strain state of flat aluminum alloy specimens and the steel dies at high processing temperature, support reaction force during pressing and the degrees of plastic strain accumulation at the optimum mode of pressing were estimated. The main numerical result is the value of accumulated plastic strain in the specimen per one pressing cycle which is about 1.14. Large degrees of strain are the reasons of grain structure and material texture changes, which leads to inevitable change of its physical-mechanical properties. Increasing the number of pressing cycles leads to proportional increase of the degree of accumulated plastic strain

Problems and Perspective Technologies of the Machinery Complex in the Format of Regional Development

Рассмотрены состояние и проблемы, направления перспективных исследований и задачи современного этапа развития машиностроительного комплекса в постановках документов стратегического планирования. Выделены задачи исследований в области машиноведения, конструкционного материаловедения, общемашиностроительных технологий (металлообработка, литье, сварка), цифровых промышленных технологий, безопасности технических систем на основе концепции ненулевого риска аварий и в области создания техники и оборудования для регионов Сибири, Севера и АрктикиThe state, problems, directions of perspective research and tasks of the modern development of the machinery complex in the strategic planning documents are considered. Research tasks in the field of machine science, structural materials science, general engineering technologies (metalworking, casting, welding), digital industrial technologies, and the safety of technical systems are highlighted based on the concept of non-zero risk of accidents in the field of machinery and equipment used in Siberia, Northern and Arctic region

Investigation of the Stress-Strain State of Crane Beams in Normal Operating Modes

Представлены результаты конечно-элементного исследования напряженно- деформированного состояния подкрановых балок в штатных режимах эксплуатации при отсутствии усталостных трещин, дефектов и повреждений. По результатам проведенных расчетов получены данные распределения интенсивности напряжений и компонент тензора напряжений, возникающих в верхней зоне стенки подкрановой балки по ее длине при различных величинах эксцентриситета нагружения, обусловленного смещением рельса от вертикальной оси сечения балки. Установлены закономерности напряженно- деформированного состояния стенки балки от ряда факторовThe results of finite element studies of the stress-strain state of crane beams in normal operating modes in the absence of fatigue cracks, defects and damages are presented. The distributions of the stress intensity and the component of stress tensor, arisen in the upper zone of crane beams wall along its length under different values of the eccentricity of load, caused by the rail shift from the vertical axis of the beam section, were obtained on the basis of performed calculations. The regularities of stress-strain state of beam wall by a number of factors were determine

Assessment of Operational Reliability Indicators of Mine Hydraulic Excavators

Приведены результаты исследования показателей надежности карьерных гидравлических экскаваторов в условиях угольного разреза «Колыванский» АО «Сибирский Антрацит». Выполнен анализ изменения показателей надежности основных групп оборудования и в целом экскаваторов. Определены количественные значения исследуемых случайных величин, оценена эффективность существующей системы сбора и анализа информации о надежности экскаваторов. Составлен рейтинг надежности среди гидравлических экскаваторов, эксплуатируемых в условиях угольного разреза «Колыванский»The results of the reliability indicators study of mine hydraulic excavators in the coal mine «Kolyvansky» of JSC «Siberian Anthracite» are presented. The analysis of the reliability indicators changes of the main equipment assemblies and excavators in general is performed. Quantitative values of the random variables have been determined, and the effectiveness of the existing system for collecting and analyzing information about the excavators reliability has been assessed. The rating of reliable hydraulic excavators in the coal mine «Kolyvansky» has been compile

Characteristic features of physical and mechanical properties of ultrafine-grained Al–Mg alloy 1560

Specimens of Al–Mg alloy 1560 of ultrafine-grained structure were obtained by the method of severe plastic deformation based on multiple equal-channel angular pressing. Impact on physical and mechanical properties of the processed material and fracture pattern of specimens was studied. Tensile tests showed an increase of the offset yield strength and resistance to rupture with decrease in the ultimate deformation. The obtained specimens have increased microhardness values compared to the initial ones. It was established that the last cycle of pressing determines the structural orientation of macroscopic shear bands occurring at an angle to the specimen longitudinal axis while passing connection of channels. It affects the physical and mechanical properties of the material and fracture pattern. The quality control of the obtained specimens by the method of ultrasonic defectoscopy and X-ray tomography confirmed the absence of macroand microdefects when following the matched optimal regime of processing

Influence of Cooling Rate on the Failure Mechanisms of Protective Oxide Layers on Ni-Based Alloys After the High-Temperature Oxidation

Проведен сравнительный анализ микроструктуры оксидных слоев, формирующихся при высокотемпературном изотермическом окислении (T = 1000 °C, 50 ч) на поверхности промышленных монокристаллических сплавов на основе никеля. Установлено влияние скорости охлаждения на состояние границы раздела металл/оксид и механизмы разрушения оксидных слоевA comparative analysis of the microstructure of protective oxide layers formed during high temperature isothermal oxidation (T = 1000 °C, 50 h) of commercial Ni-based single crystal alloys was carried out. The effect of cooling rate on the integrity of the metal/oxide interface and the damage behavior of oxide layers was establishe