CS239176B1 - Crack formation instant and point tracing wiring diagram in electric conductive materials suitable especially for fatigue testing of materials - Google Patents
Crack formation instant and point tracing wiring diagram in electric conductive materials suitable especially for fatigue testing of materials Download PDFInfo
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- CS239176B1 CS239176B1 CS839758A CS975883A CS239176B1 CS 239176 B1 CS239176 B1 CS 239176B1 CS 839758 A CS839758 A CS 839758A CS 975883 A CS975883 A CS 975883A CS 239176 B1 CS239176 B1 CS 239176B1
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- measuring
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- 239000000463 material Substances 0.000 title claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 title claims description 7
- 239000004020 conductor Substances 0.000 title claims description 4
- 238000009661 fatigue test Methods 0.000 title claims description 3
- 238000010586 diagram Methods 0.000 title 1
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 230000011664 signaling Effects 0.000 claims abstract description 7
- 239000000523 sample Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Vynález sa týká zapojenia pre dlhodobé lomovo-mechanické skúšky. Podstata vynálezu spočívá v tom, že merané úseky (2, 3) skúšaného materiálu sú zapojené ako ramená v sérii zapojených mostov napájaných zo zdroja (1) konštantného prúdu a ktorých ako druhé páry ramien sú zapojené časti potenciometra (6) rozdělené ich bežcom a signály z diagonál týchto mostov sú zapojené na vstupy meracích obvodov (9, 10) rozlišujúcich ich úroveň, polaritu a signalizujúcich okamih a miesto vzniku trhliny na skúšonom predmete. Vynález je možné využit v laboratóriách a skúšobniach, hlavně pri uskutečňovaní skúšok lomovo-mechanických vlastností materiálov a iných obdobných skúšok.The invention relates to wiring for long term fracture-mechanical tests. The essence of the invention is that it is measured the test material sections (2, 3) are connected as arms in series connected bridges fed from a constant source (1) current and whose other pairs of arms potentiometer parts connected (6) divided by their runners and signals from the diagonals these bridges are connected to the measurement inputs circuits (9, 10) distinguishing their level, polarity and signaling moment a the location of the crack on the object tester. The invention can be used in laboratories and testing facilities, mainly in implementation fracture-mechanical tests of materials and other similar tests.
Description
Vynález sa týká zapojenia zariadenia na sledovanie okamihu a miesta vzniku trhliny v elektricky vodivých materiáloch, napr. pri dlhodobých lomovo-mechanických skúškach.The invention relates to the connection of a device for monitoring the point and location of a crack in electrically conductive materials, e.g. in long-term fracture-mechanical tests.
Doteraz známe metody sledovania majú nevýhody v tom, že vyžadujú na každý sledovaný úsek meraného predmetu samostatné zariadenie a ďalej, že sú náročné na zapojenia kompenzujúce vplyv zmien teploty meraného predmetu na přesnost merania.The prior art tracking methods have the disadvantages of requiring separate devices for each section of the object being measured and furthermore that they are wiring-compensating for the effect of temperature changes of the object to be measured on measurement accuracy.
Uvedené nedostatky odstraňuje zapojenie na sledovanie okamihu a miesta vzniku trhliny v elektricky vodivých materiáloch vhodné najma pre únavové skúšky, ktorého podstata spočívá v tom, že na zdroj ko.nštantného prúdu sú napojené tak merané úseky skúšaného predmetu rozdělené meracou sondou, zapojené ako dvojica ramien minimálně jednoho meracieho mostu, ako aj konce potenciometra rozděleného bežcom na dve časti, ktoré tvoria ďalšie dve ramená meracieho mostu. Meracia sonda a bežec potenciometra sú napojené na zosilňovač signálu, ktorého výstup je zapojený na vstup tak meracieho obvodu rozlišujúce'ho úroveň a polaritu signálu, ako aj na vstup signalizačných obvodov signalizujúcich okamih a miesto vzniku trhliny na skúšanom predmete.The above mentioned drawbacks are eliminated by wiring for monitoring of the moment and place of crack formation in electrically conductive materials suitable especially for fatigue tests, which is based on the fact that the measured parts of the test item divided by measuring probe are connected to the constant current source. one end of the measuring bridge, as well as the ends of the potentiometer divided into two parts which form the other two legs of the measuring bridge. The measuring probe and the potentiometer slider are connected to a signal amplifier, the output of which is connected to the input of both the measuring circuit distinguishing the level and polarity of the signal as well as the input of the signaling circuits indicating the moment and cracking point on the test item.
Výhodou riešenia pódia vynálezu je zapojenie, ktoré umožňuje jedným zariadením súčasne sledovat dva, resp. viac meraných úsekov. Množstvo sledovaných úsekov je obinedzene možnosťami napájacieho zdroja konšfcantného prúdu. Ďalšou výhodou riešenia pódia vynálezu je, že zapojenie vylučuje vplyv kolísania teploty na přesnost merania a možno ho použiť za normálnych, nízkých 1 vysokých teplot meraných materiálov.The advantage of the solution according to the invention is the wiring, which allows one device to simultaneously monitor two resp. more measured sections. The number of monitored sections is limited by the possibilities of the constant current power supply. Another advantage of the solution according to the invention is that the circuitry eliminates the effect of temperature variation on the measurement accuracy and can be used at normal, low 1 high temperatures of the measured materials.
Příklad realizácie zapojenia podlá výkresu je schematicky znázorněný na výkrese, kde na obr. 1 je nakreslený případ, v ktorom skúšaný predmet je napojený na zdroj 1 rovnosmerného konštantného prúdu a rozdělený meracou sondou na dva úseky 2 a 3 — na dve ramená mostu. Ďalšie dve ramená mostu sú tvořené potenciometrom 6 rozdělené jeho bežcom. Konce potenciometra 6 sú napojené na merané teleso v miestach přívodu zo zdroja 1. Ak po vyvázaní mostu potenciometrom 6 sa začne šířit trhlina v ramene mostu v úseku 3, dostává sa na diagonále mostu signál so záporným znamienkom. Po jeho zosilnení v zosilňovači 8 sa privádza na obvod 9 rozlišujúci polaritu signálu a dalej na klopný obvod 10. Tento podlá nastavenej velkosti prahovej hodnoty signálu dává informáciu na signalizačný obvod 11, signalizujúci okamih vzniku trhliny a úsek, na ktorom trhlina vznikla a tiež ovládá riadiaci panel 12 zaťažovacieho stroja, ktorý přestane působit na meraný predmet. Ak trhlina vznikne v ramene úseku 2, signál má opačnú (kladná) polaritu, čo signalizuje obvod 11 a zaťažovací stroj takisto přestane působit na meraný predmet.An example of an embodiment according to the drawing is schematically shown in the drawing, where in FIG. 1 is a drawn case in which the test item is connected to a constant constant current source 1 and divided by a measuring probe into two sections 2 and 3 - two bridge arms. The other two arms of the bridge are formed by a potentiometer 6 divided by its runner. The ends of the potentiometer 6 are connected to the measured body at the supply points from the source 1. If, after the bridge has been tied up by the potentiometer 6, a crack in the bridge arm begins to spread in section 3, a negative sign is received on the bridge diagonal. After its amplification in the amplifier 8, the signal polarity circuit 9 is fed to the flip-flop 10. This, according to the set signal threshold size, provides information to the signaling circuit 11 indicating the moment of crack formation and the section at which the crack originated. a panel 12 of a loading machine that stops acting on the object to be measured. If a crack occurs in the arm of the section 2, the signal has the opposite (positive) polarity, which signals the circuit 11 and the loading machine also stops acting on the object to be measured.
Na obr. 2 je zapojenie, pri ktorom skúšaný predmet je rozdělený na η-úsekov, ktoré po dvojiciach (2 a 3j, (4 a 5), až (η—1 a n] vytvárajú s potenciometramí 6, 7,... m v sérii zapojené meracie mosty napájané zo zdroja 1 konštantného striedavého prúdu. Před začiatkom zaťažovacej skúšky sa všetky mosty vyvážia potenciometrami 6, 7 ... až m. Ak působením zaťažovacej sily vznikne trhlina, napr. v úseku 5, signál z diagonály mostu po zosilnení v zosilňovači 8 přídě na fázovo citlivý obvod 9. Na druhý vstup fázovo citlivého obvodu 9 je zároveň napojené striedavé napatie zo zdroja 1 konštantného prúdu, umožňujúce rozlišit fázu meraného signálu. Fázovo citlivý obvod 9 rozliší miesto vzniku trhliny medzi ramenom v úseku 4 a 5, signál z jeho výstupu prichádza na vstup klopného obvodu 10. Z výstupu klopného obvodu 10 sa dostává signál na vstup obvodu 11 signalizujúcej okamih vzniku trhliny a úsek, v ktorom trhlina vznikla, dalej na vstup ovládacieho panelu 12 zaťažovacieho stroja, ktorý zastaví jeho působenie na meraný predmet.In FIG. 2 is a wiring in which the test item is divided into η-sections which, in pairs (2 and 3j, (4 and 5), up to (η — 1 and n), form potentiometers 6, 7, ... m in series bridges supplied from constant AC source 1. Prior to the start of the load test, all bridges shall be balanced by potentiometers 6, 7 ... to m. If a load develops a crack, eg in section 5, a signal from the bridge diagonal after amplification in bow amplifier 8 the phase-sensitive circuit 9 is connected to the second input of the phase-sensitive circuit 9 at the same time with an alternating voltage from a constant current source 1 to distinguish the phase of the measured signal. arrives at the input of the flip-flop 10. The output of the flip-flop 10 receives a signal at the input of the flip-flop 11, indicating the moment of crack formation and the section in which the crack originated. at the input of the control panel 12 of the loading machine, which stops its action on the object to be measured.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS839758A CS239176B1 (en) | 1983-12-22 | 1983-12-22 | Crack formation instant and point tracing wiring diagram in electric conductive materials suitable especially for fatigue testing of materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS839758A CS239176B1 (en) | 1983-12-22 | 1983-12-22 | Crack formation instant and point tracing wiring diagram in electric conductive materials suitable especially for fatigue testing of materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS975883A1 CS975883A1 (en) | 1985-05-15 |
| CS239176B1 true CS239176B1 (en) | 1985-12-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS839758A CS239176B1 (en) | 1983-12-22 | 1983-12-22 | Crack formation instant and point tracing wiring diagram in electric conductive materials suitable especially for fatigue testing of materials |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS239176B1 (en) |
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1983
- 1983-12-22 CS CS839758A patent/CS239176B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS975883A1 (en) | 1985-05-15 |
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