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Исследование закономерностей локализации пластической деформации при высокоскоростном пробивании образцов из сплава a6061

Исследование закономерностей локализации пластической деформации при высокоскоростном пробивании образцов из сплава a6061

Abstract

Работа направлена на выявление закономерностей локализации пластической деформации при динамическом нагружении образцов из сплава А6061. Схема нагружения соответствует механизму образования и выноса пробки. Скорости соударения стального ударника с образцом-мишенью варьировались от 101 до 260 м/с. При малых скоростях соударения, недостаточных для полного выноса пробки из образца, механизмом разрушения является образование и слияние микропор под действием сдвиговых напряжений. С возрастанием скорости соударения разрушение происходит по узким полосам локализованной деформации. Микроскопический анализ внутренней структуры деформированного материала вблизи поверхности разрушения позволил оценить величины локальных сдвиговых деформаций в зависимости от расстояния до места локализации деформации в различных по глубине образца областях. Обнаружено, что по мере удаления от контактной поверхности распределение деформаций становится все более неоднородным, а также все большее количество прилегающей структуры оказывается задействованной в процессе деформирования. Теоретические расчеты процессов высокоскоростной пластической деформации, основанные на структурно-кинетической модели [1], совпадают с полученными экспериментальными данными.

The work aims to identify patterns of localization of plastic deformation under dynamic loading of samples alloy A6061. The scheme of loading corresponds to the formation mechanism and the transport tube. Impact velocity of steel drums with a sample-target ranged from 101 to 260 mps. At small impact velocities, are insufficient to complete removal of tube from the sample, the mechanism of fracture is the formation and merging of micropores under the action of shear stress. With increasing velocity of impact fracture occurs in narrow bands of localized deformation. Microscopic analysis of the internal structure of the deformed material near the fracture surface allowed us to estimate the value of local shear strain, depending on the distance to the localization of deformation in different depth in the sample areas. It was found that the distance from the contact surface strain distribution becomes more heterogeneous, as well as an increasing number of adjacent structures is involved in the process of deformation. Theoretical calculations of the processes of high deformation, based on structural-kinetic model coincide with the experimental data.

Keywords

ДИНАМИЧЕСКОЕ ДЕФОРМИРОВАНИЕ МЕТАЛЛОВ, МИКРОСТРУКТУРНЫЙ АНАЛИЗ, ЛОКАЛИЗАЦИЯ ДЕФОРМАЦИИ, ПОЛОСЫ АДИАБАТИЧЕСКОГО СДВИГА

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze