SU1677571A1 - Method for determining specific crushing energy - Google Patents
Method for determining specific crushing energy Download PDFInfo
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- SU1677571A1 SU1677571A1 SU894687408A SU4687408A SU1677571A1 SU 1677571 A1 SU1677571 A1 SU 1677571A1 SU 894687408 A SU894687408 A SU 894687408A SU 4687408 A SU4687408 A SU 4687408A SU 1677571 A1 SU1677571 A1 SU 1677571A1
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- destruction
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- cracks
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- energy
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Изобретение относитс к испытательной технике. Цель изобретени - повышение точности определени энергии разрушени за счет учета энергообмена между областью разрушени , образцом и системой нагружени . Используют два одинаковых образца с надрезами и нагружают их сначала различной статической нагрузкой . Затем довод т образцы до разрушени одинаковой динамической нагрузкой. При этом регистрируют дл каждого образца значени ti и t2 времени образовани трещин . На разрушенных образцах измер ют длины И и 2 трещин, образовавшихс в каждом из образцов. Удельную энергию разрушени определ ют по значени м нагрузок с учетом отношений h/ti и ilvi.This invention relates to a testing technique. The purpose of the invention is to improve the accuracy of determining the energy of destruction by taking into account the energy exchange between the area of destruction, the sample and the loading system. Use two identical samples with cuts and load them first with a different static load. Then the specimens are brought to failure by the same dynamic load. For each sample, the times ti and t2 of the time of formation of cracks are recorded. On fractured specimens, lengths And and 2 cracks formed in each of the specimens are measured. The specific energy of destruction is determined by the load values taking into account the ratios h / ti and ilvi.
Description
елate
сwith
Изобретение относитс к испытатель- ной технике и может быть использбвано дл определени удельной энергии разрушени .The invention relates to a test technique and can be used to determine the specific fracture energy.
Цель изобретени - повышение точности определени за счет учета энергообмена между областью разрушени , образцом и системой нагружени .The purpose of the invention is to improve the accuracy of determination by taking into account the energy exchange between the area of destruction, the sample and the loading system.
Способ осуществл ют следующим образом .The method is carried out as follows.
Используют два одинаковых образца с надрезами и нагружают их сначала различной статической нагрузкой. Затем эти нагруженные образцы довод т до разрушени одинаковой динамической нагрузкой.Use two identical samples with cuts and load them first with a different static load. These loaded samples are then brought to destruction by the same dynamic load.
При этом регистрируют дл каждого образца значени ti и t2 времени образовани трещин.For each sample, the times ti and t2 of the time of formation of cracks are recorded.
На разрушенных образцах измер ют длины И и 12 трещин, образовавшихс в каждого из образцов.On fractured specimens, lengths And and 12 cracks formed in each of the specimens are measured.
Удельную энергию разрушени у определ ют по значени м Pi и Р2 статической нагрузки и с учетом отношений h/ti и по соотношениюThe specific energy of failure y is determined by the static load values Pi and P2 and taking into account the ratios h / ti and the ratio
,.)г.) g
7 7
Pi -P2Pi -P2
(иА1)(|2/«2)(iA1) (| 2 / “2)
i;i;
где а - ширина образцаwhere a is the width of the sample
d - толщина образца;d is the sample thickness;
10 - длина надреза; Ф(1о/а)1.11+5(1о/а)4/(1-10/а);10 - notch length; F (1o / a) 1.11 + 5 (1o / a) 4 / (1-10 / a);
F(l/t) - функци , учитывающа плотность материала и скорость распространени в нем трещиныF (l / t) - function, taking into account the density of the material and the rate of propagation of cracks in it
Пример. Испытывали образцы из полиметилметакрилата 120 100 4 мм. Длина бокового надреза 25 мм, радиус при вершине 0,05 мм. Статические нагрузки имели значени 500 и 1000 Н. Динамическое нагружение осуществл ли путем взрыва проводника при действии импульса тока 20 кА длительностью 40 мкс. Дл одного образца получено .5 мм, мкс, а дл Example. Samples of polymethyl methacrylate 120 100 4 mm were tested. The length of the lateral notch is 25 mm, the radius at the tip is 0.05 mm. The static loads had values of 500 and 1000 N. Dynamic loading was carried out by exploding a conductor under the action of a 20 kA current pulse with a duration of 40 µs. For one sample received .5 mm, μs, and for
оabout
XJ VIXj vi
слcl
х|x |
другого - to1 5,5 мм, мкс. Удельна работа разрушени составила 4,1 Дж/см2.the other - to1 5.5 mm, μs. The specific work of destruction was 4.1 J / cm2.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU894687408A SU1677571A1 (en) | 1989-05-03 | 1989-05-03 | Method for determining specific crushing energy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU894687408A SU1677571A1 (en) | 1989-05-03 | 1989-05-03 | Method for determining specific crushing energy |
Publications (1)
Publication Number | Publication Date |
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SU1677571A1 true SU1677571A1 (en) | 1991-09-15 |
Family
ID=21445753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU894687408A SU1677571A1 (en) | 1989-05-03 | 1989-05-03 | Method for determining specific crushing energy |
Country Status (1)
Country | Link |
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SU (1) | SU1677571A1 (en) |
-
1989
- 1989-05-03 SU SU894687408A patent/SU1677571A1/en active
Non-Patent Citations (1)
Title |
---|
Авторское свидетельство СССР № 1499164, кл. G 01 N 3/30, 1987. * |
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