SU819621A1 - Method of material dynamic destructive toughness testing - Google Patents

Method of material dynamic destructive toughness testing Download PDF

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Publication number
SU819621A1
SU819621A1 SU792782123A SU2782123A SU819621A1 SU 819621 A1 SU819621 A1 SU 819621A1 SU 792782123 A SU792782123 A SU 792782123A SU 2782123 A SU2782123 A SU 2782123A SU 819621 A1 SU819621 A1 SU 819621A1
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USSR - Soviet Union
Prior art keywords
crack
sample
testing
beginning
fracture toughness
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SU792782123A
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Russian (ru)
Inventor
Геннадий Владимирович Степанов
Валерий Алексеевич Маковей
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Институт Проблем Прочности Анукраинской Ccp
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(54) СПОСОБ ИСПЫТАНИЯ МАТЕРИАЛА НА ДИНАМИЧЕСКУЮ ВЯЗКОСТЬ РАЗРУШЕНИЯ трещины 3 до горца пластины выбирают из услови  e7/ct/2, где с - скорость распространени  упругой волны в материале образца; - врем  от начала нагружени  до момента начала роста тре щины..При подрыве зар да ВВ давление продуктов взрыва возбуждает в образце циПЙндрическую волну, прохождение которо через область усть  трещины 3 сопрово кдаетс  возникновением раст гивающих напр жений, привод щих к ее иниции рованию. Регистрируют диаграмму изменени  давлени  во време1ш с помощью осциллографировани  сигнала от датчика давлени  и момент инициировани  тре- щины с помощью датчика 6 разрыва. Затем провер ют, удовлетвор ет ли приведенному выше условию размер t от усть  трещины до.торца пластины. Если условие не выполнено, то необходи мо изменить геометрические размерьт образца. Указанный выбор величины В позвол ет учесть распространение тольк первой волны нагрузки без ее взаимодействи  с отраженными волнами. Если условие дл  величины В выполнено, то затем рассчитывают динамическую в зкость разрушени  материала в устье тре щины в момент ее динамического инициировани , котора  характеризует тре- щиностойкость. материала и служит дл (54) METHOD FOR TESTING MATERIAL ON DYNAMIC VISCOSITY OF DESTRUCTING a crack 3 to a highlander plate is chosen from the condition e7 / ct / 2, where c is the velocity of propagation of an elastic wave in the sample material; - time from the beginning of loading to the moment of the beginning of crack growth. When explosive charge is detonated, the pressure of the explosion products excites a cypdrial wave in the sample, the passage of which through the region of the crack 3 is accompanied by the appearance of tensile stresses leading to its initiation. A graph of the pressure change over time is recorded by oscillography of the signal from the pressure sensor and the moment of crack initiation by means of the fracture sensor 6. Then it is checked whether the above condition satisfies the size t from the mouth of the crack to the end face of the plate. If the condition is not fulfilled, then the geometric dimensions of the sample must be changed. This choice of value B makes it possible to take into account the propagation of only the first wave of the load without its interaction with the reflected waves. If the condition for the value B is fulfilled, then the dynamic viscosity of the material destruction at the crack mouth at the time of its dynamic initiation, which characterizes the crack resistance, is calculated. material and serves for

//

Claims (1)

фуг./ 14 выбора материалов конструкций, работающих в услови х ударных нагрузок. Формула изобретени  Способ испытани  материала на динамическую в зкость разрушени , заключающийс  в том, что образец с трещиной нагружают динамически и регистрируют рост трещины и изменение нагрузки во времени, по которым рассчитывают динамическую в зкость разрушени , о тличающийс  тем, что, с целью повышени  точности .испытани , используют образец в виде пластины с цилиндрическим отвепстием, на поверхность которого нанесена трещина, нагружают ее по поверхности отверсти  импульсным давлением, а размер i от усть  трещины до торца пластины выбирают из услови  , где С - скорость распространени  упругой волны в материале образца; fr - врем  от начала нагружени  до момента начала роста трещины. Источники информации, прин тые во внимание при экспертизе I. Ударные испытани  металлоЕ5. Пер. с англ. Под ред. Б. А. Дроздовского и Е. М. Морозова. М., Мир; 1973, с 1330 (прототип).Fug. / 14 selection of materials of structures operating under shock loads. The Invention Method A method for testing a dynamic fracture toughness, such that a sample with a crack loads dynamically and records the crack growth and load change over time, which is used to calculate the dynamic fracture toughness, in order to increase accuracy. test, use a sample in the form of a plate with a cylindrical outlet, on the surface of which a crack is applied, load it over the surface of the hole with a pulse pressure, and size i from the mouth of the crack to the end face Stina selected from the conditions, wherein C - velocity of propagation of the elastic wave in the sample material; fr is the time from the beginning of loading until the beginning of crack growth. Sources of information taken into account in the examination I. Percussion testing of metal E5. Per. from English Ed. B. A. Drozdovsky and E. M. Morozov. M., Mir; 1973, from 1330 (prototype). // Ф1/г.гF1 / yr
SU792782123A 1979-06-19 1979-06-19 Method of material dynamic destructive toughness testing SU819621A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110672438A (en) * 2019-10-16 2020-01-10 浙江科技学院 Round hole linear nail column type double-sided energy-gathering joint cutting device for dynamically punching rock-soil body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110672438A (en) * 2019-10-16 2020-01-10 浙江科技学院 Round hole linear nail column type double-sided energy-gathering joint cutting device for dynamically punching rock-soil body
CN110672438B (en) * 2019-10-16 2021-11-23 浙江科技学院 Round hole linear nail column type double-sided energy-gathering joint cutting device for dynamically punching rock-soil body

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