Relation between the deformation energy and the Poisson ratio during cyclic loading of austenitic steel

Mishakin, V. V.; Klyushnikov, V. A.; Гончар, А. В.

doi:10.1134/s1063784215050163

Cited by 30 publications

(5 citation statements)

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“…The evolution of the microstructure in the form of the growth of a new phase significantly changes the strength characteristics of the material. Precipitation of hard strengthening martensite particles leads to an increase in the strain in the microvolumes of a soft phase (austenite) and to a sharp increase in the energy density of plastic deformation, which causes rapid formation of microdefects [11].…”

Section: Resultsmentioning

confidence: 99%

Thermo-ultrasound method for determining the damage of structural material

2018

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The effect of plastic strain and temperature on the longitudinal and shear waves velocity of austenitic stainless steel 12Kh18N10T (analogue AISI 321) is investigated. Cryogenic corrosion-resistant austenitic steel 12Kh18N10T is interesting due to the fact, that during plastic deformation a martensitic phase is formed. The martensitic phase significantly changes the electromagnetic, elastic and strength properties of the entire material. The formation of a new phase in conjunction with the process of plastic deformation has a significant effect on the temperature dependence of the elastic wave velocity. As a result of the studies, numerical values of the temperature-velocity factor for longitudinal and shear ultrasonic waves in steel 12Kh18N10T were obtained. The relationship between changes of the magnetic phase and temperature-velocity factor is suggested; it can be used for determining the material damage by the ultrasound method.

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Section: Resultsmentioning

confidence: 99%

Thermo-ultrasound method for determining the damage of structural material

2018

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“…Известно, что пластическое деформирование хромоникелевых сталей с низкой энергией дефектов упаковки сопровождается образованием фазы деформационного мартенсита из исходной фазы аустенита. Выделение мартенситной фазы, имеющей более высокие прочностные свойства по сравнению с фазой аустенита, приводит к изменению электромагнитных, упругих и акустических свойств всего материала, а также оказывает влияние на процесс накопления поврежденности в более мягком аустените [1][2][3][4][5]. В [6] показано, что плотность микротрещин имеет высокую корреляцию с объемной долей деформационного мартенсита.…”

Section: Introductionunclassified

“…В работе [1] получено, что коэффициент Пуассона, определяемый с помощью акустических измерений, можно использовать в качестве диагностического структурно-чувствительного параметра состояния аустенитной стали при усталостном разрушении. Коэффициент Пуассона ν выражается через времена или скорости упругих волн следующим образом:…”

Section: Introductionunclassified

Влияние Микротрещин На Коэффициент Пуассона При Пластическом Деформировании Аустенитной Стали

Kirikov¹,

Mishakin²,

Клюшников³

2022

Журнал Технической Физики

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We researched the influence of damage accumulation on the Poisson's ratio measured by echo-pulse acoustic method during plastic deformation of 12Kh18N10T steel. On the basis of the obtained experimental data we calculated the partial contributions to the change in the Poisson's ratio of damage accumulation and separation of the strain induced martensite phase. The characteristics of stable cracks forming near strain martensite particles at small degrees of plastic strain have been analyzed by computer simulation. The theoretical dependence of the change in the Poisson's ratio due to crack formation during plastic deformation has been constructed. A good agreement between the experimental data and theoretical calculations has been obtained.

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“…Nonlinear microstructure defects in propagating ultrasound and the influence of mixed dislocations on the local stresses were investigated, which lead to an asymmetrical dislocation movement and back stress [24,30,31]. To identify cracks, the method of two superimposed ultrasonic frequencies was further developed [32,33]. This was combined with the dislocation theory [20,21] and with the model of the one-dimensional wave equation up to the third order of nonlinearity.…”

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confidence: 99%

“…The physical values for Poisson's ratio and for the shear modulus (Lamé constant) are assumed to be constant before and after the loading [32,33].…”

mentioning

confidence: 99%

Determination of plastic deformation with variable ultrasonic excitation positions

Mevissen

2024

EPL

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For highly stressed mechanical components, the information about a beginning plastic deformation is of enormous importance. Therefore, nondestructive testing and structural health monitoring techniques are essential to examine components and to make statements about the mechanical integrity.In this work, the dislocation theory was extended and combined with ultrasonic wave excitation to obtain a dislocation description in isotropic materials. In the analytical derivation, the ultrasonic longitudinal waves were sent at different angles of attack relative to the uniaxial tensile load. The derived nonlinearity coefficients enabled the investigation as a function of these angles. The evaluated coefficient behaviour allows statements about the position of the ultrasonic excitation relative to the tensile load. Furthermore, a signature could be derived from which the degree of plasticity can be determined if a reference measurement is available.The newly derived coefficients and their behaviour make it possible to efficiently detect the beginning plastic deformation and to predict the position of the applied load vector.

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Relation between the deformation energy and the Poisson ratio during cyclic loading of austenitic steel

Cited by 30 publications

References 1 publication

Thermo-ultrasound method for determining the damage of structural material

Thermo-ultrasound method for determining the damage of structural material

Влияние Микротрещин На Коэффициент Пуассона При Пластическом Деформировании Аустенитной Стали

Determination of plastic deformation with variable ultrasonic excitation positions

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