SU834442A1 - Internal stress of the second kind determination method for structural material under mechanical tests - Google Patents

Internal stress of the second kind determination method for structural material under mechanical tests Download PDF

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Publication number
SU834442A1
SU834442A1 SU792825763A SU2825763A SU834442A1 SU 834442 A1 SU834442 A1 SU 834442A1 SU 792825763 A SU792825763 A SU 792825763A SU 2825763 A SU2825763 A SU 2825763A SU 834442 A1 SU834442 A1 SU 834442A1
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USSR - Soviet Union
Prior art keywords
stresses
intensity
internal stresses
internal
increase
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SU792825763A
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Russian (ru)
Inventor
Лев Иванович Лавейкин
Константин Ильич Молодцов
Константин Владимирович Набойченко
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Московский Ордена Трудового Красно-Го Знамени Инженерно-Физический Инсти-Тут
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Priority to SU792825763A priority Critical patent/SU834442A1/en
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Description

(54) СПОСОБ ОПРЕДЕЛЕНИЯ ВНУТРЕННИХ НАПРЯЖЕНИЙ(54) METHOD FOR DETERMINING INTERNAL STRESSES

ВТОРОГО РОДА В КОНСТРУКЦИОННОМ МАТЕРИАЛЕSECOND KIND IN CONSTRUCTION MATERIAL

Claims (1)

ПРИ МЕХАНИЧЕСКИХ ИСПЫТАНИЯХ 3 83444 После выдержки .образца под нагрузкой в течение заданного времени производ т его разгрузку с посто нной скоростью обратных пластических сдвигов. В момент равнодействи  указанные напр жени  не вызывают изменени  пластической деформации , а в последующий момент действие внутренних напр жений про вл етс  эффективней , чем действие напр жений от внешних усилий. Это вызывает увеличение обратных пластических деформаций и ска-JQ чок интенсивности акустической эмиссии. По моменту скачка интенсивности определ ют внешние усили  и внутренние напр жени , равнодействующие им. Предлагаемый способ позвол ет повысить точность определени  внутренних напр жений при механических испытани х конструкционных материалов. 15 2 Формула изобретени  Способ определени  внутренних напр жений второго рода в конструкционном материале при механических испытани х, заключающийс  в том, что образец материала нагружают, выдерживают в течение заданного времени, разгружают, регистрируют изменение нагрузки и фиксируют момент достижени  равнодействи  внутренних и внешних напр жений, отличающийс  тем, что, с целью повышени  точности определени  внутренних напр жений, разгрузку производ т с посто нной скоростью, одновременно регистрируют интенсивность акустической эмиссии и определ ют внутренние напр жени  в момент скачка интенсивности. Источники информации, прин тые во внимание при экспертизе I. Ahlguist С. N. and Nix W. D. Jer. Met., 3, 679, 1969 (прототип).MECHANICAL TESTS 3 83444 After holding the sample under load for a specified time, it is unloaded at a constant rate of reverse plastic shears. At the moment of equilibrium, the indicated stresses do not cause a change in plastic deformation, and at a subsequent moment the action of internal stresses is more effective than the action of stresses from external stresses. This causes an increase in the inverse plastic deformations and a ska-jq intensity acoustic emission. The external forces and internal stresses, which result in them, are determined by the moment of the intensity jump. The proposed method makes it possible to increase the accuracy of determining internal stresses during mechanical testing of structural materials. 15 2 The invention of the method of determining the internal stresses of the second kind in the structural material during mechanical testing, which means that the sample of the material is loaded, maintained for a predetermined time, unloaded, register the change in load and record the time when equalized internal and external stresses are reached, characterized in that, in order to increase the accuracy of determining internal stresses, unloading is performed at a constant speed, the intensity of the acoustic emissions and determine the internal stresses at the time of the jump in intensity. Sources of information taken into account in the examination of I. Ahlguist, S. N. and Nix, W. D. Jer. Met., 3, 679, 1969 (prototype).
SU792825763A 1979-10-03 1979-10-03 Internal stress of the second kind determination method for structural material under mechanical tests SU834442A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU792825763A SU834442A1 (en) 1979-10-03 1979-10-03 Internal stress of the second kind determination method for structural material under mechanical tests

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU792825763A SU834442A1 (en) 1979-10-03 1979-10-03 Internal stress of the second kind determination method for structural material under mechanical tests

Publications (1)

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SU834442A1 true SU834442A1 (en) 1981-05-30

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SU792825763A SU834442A1 (en) 1979-10-03 1979-10-03 Internal stress of the second kind determination method for structural material under mechanical tests

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SU (1) SU834442A1 (en)

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