CN2697630Y - Deflection displacement measuring mechanism for small impact bar test - Google Patents
Deflection displacement measuring mechanism for small impact bar test Download PDFInfo
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- CN2697630Y CN2697630Y CN 200320108271 CN200320108271U CN2697630Y CN 2697630 Y CN2697630 Y CN 2697630Y CN 200320108271 CN200320108271 CN 200320108271 CN 200320108271 U CN200320108271 U CN 200320108271U CN 2697630 Y CN2697630 Y CN 2697630Y
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- displacement
- jumper bar
- clamping head
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Abstract
The utility model discloses a novel deflection displacement measuring mechanism for small impact bar test, which comprises an upper clamping (5), a lower clamping head (6), a small impact bar (1) and a displacement sensor (4), wherein the lower clamping head (6) is fixed on a base of a test machine by screws. A disk shape test sample (3) is put into a concave hole of the lower clamping head (6), and then the upper clamping head (5) is fastened with the lower clamping head (6) by an inner screw; the small impact bar (1) is screwed into the upper clamping head (5). The utility model is characterized in that displacement sensor (4) is fixed on the lateral face of the lower clamping head (6) by a small screw. A load sensor (7) is connected with a push bar of a hydraulic cylinder by a thread hole on the upper part of the load transducer (7); a baffle plate (8) and an impact anvil (9) are fastened tightly with the load sensor (7) by thread holes on the lower part of the load sensor (7). The height of the top (to the base) of the displacement sensor is H; after the small disk-shaped test sample and the small steel ball are assembled, the height of the top (to the base) of the small impact bar is H1, and H1 is larger than H. The utility model solves the null point calibration problem of the displacement sensor, and the utility model can decrease the dimension of the lower clamping head. Meanwhile, the utility model is convenient for cleaning test sample fragments.
Description
Technical field
The utility model relates to a kind of measuring mechanism, relates in particular to the novel deflection displacement measuring mechanism in a kind of little jumper bar test.
Background technology
Exist the pressure vessel and the pipeline of a large amount of military services in electric power, nuclear power and the petroleum chemical industry, the current performance and the residual life of how to evaluate and these equipment of prediction are the hot subjects of research always.Traditional lossless detection method and sampling test method are the main experimental study methods of this respect always, because the both has limitation separately---and the former is simple, harmless, but the information that records is imperfect, and degree of accuracy is not enough; The latter and can't take a sample accurately and reliably but destructiveness is arranged sometimes.The method of harmless or half nondestructive test to be adopted on the one hand as far as possible, the performance of material must be obtained on the other hand again to greatest extent.In some material property research,, thereby can't satisfy of the requirement of conventional material performance test in addition to specimen size sometimes because the volume that can materials is too little.In the research of the material damage after neutron irradiation, because nuclear reactor only can provide limited space, the damage field of particle accelerator generation simultaneously is also very narrow, and the size of sample has been subjected to strict restriction like this.In addition, as in the performance variation law research of welding joint heat-affected zone, because this regional extent is very little, it is obviously impossible to obtain material mechanical performance with conventional method, therefore must find new microspecimen test method(s) (Small Specimen Test is called for short SST) to make a service test to adapt to microspecimen, little jumper bar experimental technique (Small Punch (SP) Test Technique) arises under this background just, in a kind of new not only effective but also economic safety detection method that the eighties initial stage grows up gradually, a kind of not only have " harmless sampling " property but also have the novel test method of accurate reliability.
Little jumper bar test method(s) principle:
Little jumper bar test (Small Punch Test, be called for short SPT) be that a kind of jumper bar that utilizes is with certain speed punching press sample thin slice, load～displacement (distortion amount of deflection) data of record test piece from be deformed to the whole process that lost efficacy, and analyze the test method that draws the various performance parameters of material whereby.Test can be circular or square with sample, it is small-sized, and generally its diameter or the square length of side are that 3～10mm does not wait, and thickness is within 0.1～0.5mm scope.Typical load～displacement curve (be called for short P～δ curve) that test obtains is as shown in Figure 4:
Therefrom we can determine that some are used for the parameter of exosyndrome material distortion and fracture property, as yield load P
y, maximum load P
Max, inefficacy amount of deflection δ
fWith energy to failure E
fDeng, the method for utilization theory then and analysis of experiments can be converted into a series of material property data such as intensity, plasticity, fracture toughness with these characterization parameters that obtain among this figure.
What adopt in the at present external little jumper bar test is the deflection displacement direct measuring method, and there is following defective in the direct measuring mechanism of its deflection displacement as shown in Figure 1.
Direct measuring mechanism of deflection displacement and defective thereof
Because the restriction of chuck and specimen size all causes suitable difficulty for the installation of displacement transducer, measurement.With reference to the little jumper bar testing equipment outside drawing in some foreign literature data, all adopt the direct and sample bottom contact measurement of displacement transducer thimble head as shown in Figure 1, outwardly, can accurately measure deformation displacement like this, actually this is not so; By anatomizing, this method drawback is a lot, and its reason is as follows:
1. the thimble contact diameter of general displacement transducer is about about φ 5mm, generally big or small with the lower chuck aperture, from this aspect on, it is just very difficult that the thimble contact directly contacts sample itself, even the diameter of thimble contact can reduce in addition, because the displacement transducer total length of this orthoscopic is generally also all more than 70mm, if sensor is positioned at the bottom, lower chuck certainly will be also very high so, so it is very unreasonable also to seem on the structure.
2. after the off-test, sample breaks, after little steel ball tumbles, and little steel ball and the sample not easy-clear of relic that breaks; Just must unload lower chuck after using a period of time, remove sample fragment and steel ball, bring very big inconvenience to use.
3. most critical is, the actual zero point of sensor is difficult to find accurately; At first this straight line needle sensor, back springing type particularly, owing to the contained spring reason, it is the idle motion displacement that the thimble contact all has a bit of, in other words, even it might reading but still be zero that a little displacement is arranged, therefore at first must calibrate the absolute zero position of sensor before the test earlier, must guarantee also during installation that this absolute zero position is just in time pasting the sample lower surface.Even found this absolute zero position when secondly installing accurately, but in the sample clamping process, also can to fixing generation of sensor micro-displacement be arranged inevitably, thereby cause reading not accurate.
Summary of the invention
At the shortcoming of above-mentioned deflection displacement measuring mechanism, the utility model has designed a kind of novel deflection displacement measuring mechanism, so that adopt indirect measurement method, overcomes the defective that original direct contact type displacement measurement exists, and makes things convenient for test operation greatly.
Indirect measuring mechanism of deflection displacement and superiority thereof:
In view of many drawbacks that direct contact type is measured, use the indirect measuring mechanism of deflection displacement here through taking all factors into consideration, the problem of this indirect measurement most critical is the deformation displacement starting point how to determine.What adopt here is that software is determined the starting point method automatically.When load transducer has the signal stand under load, write down the shift value of displacement transducer at that time immediately, be that relative zero begins to measure with shift value at this moment.
Technical scheme:
The novel concrete measuring mechanism of this invention is realized as shown in Figure 2.Load transducer 7 is connected with the hydraulic cylinder push rod by the threaded hole on top, and baffle plate 8 and impact anvil 9 also tighten together by load transducer 7 lower thread holes and load transducer 7.Lower chuck 6 is fixed by four screws and tester base, and displacement transducer 4 also is fixed on the side of lower chuck 6 by Screw.During test operation, after sample was put between two chucks, last lower chuck was fastening with socket head cap screw.The height on displacement transducer 4 tops (to base) is H; After installing sequin sample and little steel ball, the height on little jumper bar top (to base) is H1, runs into sensor earlier in order to guarantee baffle plate, just impact anvil is run into little jumper bar then, notes H＞H1 when little jumper bar height dimension design and sensor assembling.
As shown in Figure 2, when test is carried out, the hydraulic cylinder push rod drives the operation downwards together of load transducer 7, baffle plate 8, impact anvil 9, before impact anvil 9 below load transducer 7 is run into little jumper bar 1, baffle plate 8 has touched the measurement end of displacement transducer 4 earlier, along with load maintainer continues down motion, displacement transducer 4 has been sensed certain shift value, when in a single day load transducer 7 has sensed load (load transducer is output as zero during zero load), impact anvil below illustrating has really touched little jumper bar 1, begins to have loaded.So can set the shift value of the displacement transducer of this moment in software is initial displacement, real deformation displacement is actually the displacement sensor value and deducts this initial displacement value later on.This principle of measuring indirectly is the key of displacement measurement.
Beneficial effect:
Superiority of the present utility model is:
1. the lower chuck size can reduce greatly, has reduced the size of machine.
2. after the test, need not worry that little steel ball tumbles and the sample relic can't be removed problem.Owing to there be not stopping of displacement transducer, little steel ball and sample relic can be smoothly center pit by lower chuck fall, make things convenient for testing crew to take out from the chuck bottom.
3. need not worry at all that the actual zero point of displacement transducer demarcates problem, also no problem even the displacement transducer installation position is equipped with certain deviation, because be relative zero the zero point of measuring, determine automatically by computer program.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Description of drawings:
Fig. 1 is the direct measuring mechanism of deflection displacement;
Fig. 2 is the indirect measuring mechanism of deflection displacement;
Fig. 3 is a sample clamping step precedence diagram;
Fig. 4 is typical load～displacement curve figure;
Fig. 5-the 1st, 1.25Cr0.5Mo material P～δ curve map;
Fig. 5-the 2nd, 1Cr5Mo material P～δ curve map;
Fig. 5-the 3rd, 16MnR material P～δ curve map.
Wherein in Fig. 1, Fig. 2,1 is that little jumper bar, 2 is that little steel ball, 3 is that disk sample, 4 is that displacement transducer, 5 is that upper grip, 6 is that lower chuck, 7 is that load transducer, 8 is that baffle plate, 9 is that impact anvil, 10 is the lower chuck through hole.
Embodiment:
(1) as Fig. 3 .a, ready disk sample is put into the upper grip shrinkage pool, (under the effect of lubricant oil surface tension force, when upper grip overturn, general sequin can not fall) puts into little steel ball (φ 2.5mm) simultaneously;
(2) as Fig. 3 .b, lightly it is set on the lower chuck behind the upset upper grip, lower chuck is cooperated; Screw four trip bolts at last, when screwing trip bolt, note adopting the diagonal angle to tighten mode, preventing to cause owing to the chuck holding force is uneven can not firm grip and position off-centre.
(3) as Fig. 3 .c, put into little jumper bar at last, when putting into, note the little jumper bar of rotation, prevented jam.
(4) as Fig. 3 .d impact anvil and baffle plate are rotatably fixed on the pressure transducer.
(5) the hydraulic cylinder push rod drives the operation downwards together of load transducer 7, baffle plate 8, impact anvil 9, before impact anvil 9 below load transducer 7 is run into little jumper bar 1, baffle plate 8 has touched the measurement end of displacement transducer 4 earlier, along with load maintainer continues down motion, displacement transducer 4 has been sensed certain shift value, when in a single day load transducer 7 has sensed load (load transducer is output as zero during zero load), the impact anvil below illustrating has really touched little jumper bar 1, begins to have loaded.So can set the shift value of the displacement transducer of this moment in software is initial displacement, real deformation displacement is actually the displacement sensor value and deducts this initial displacement value later on.Opening testing machine and data acquisition program tests.
(6) P～δ curve stability, the repeatability of measurement generation are good
(16MnR) sample is tested and is drawn P～δ for 1.25Cr0.5Mo, 1Cr5Mo to multiple material to utilize this measuring mechanism
Curve, as shown in Figure 5, wherein every kind of material has been done the test of three samples, this measuring mechanism result of use in test is fine as can be seen for the P～δ curve ratio that draws respectively from three samples of every kind of material, the test findings of same material sample is very identical, has reached the test objective requirement.
Claims (4)
1. a novel little jumper bar is tested the deflection displacement measuring mechanism, comprise upper grip (5), lower chuck (6), little jumper bar (1), displacement transducer (4), lower chuck (6) is fixed by screw and tester base, garden sheet sample (3) is put into the shrinkage pool of lower chuck (6), put into little steel ball (2) simultaneously, thereafter upper grip (5) is fastening by inner bolt and lower chuck (6), little jumper bar (1) screws in the upper grip of packing into (5), it is characterized in that, displacement transducer (4) is fixed on the side of lower chuck (6) by Screw, load transducer (7) is connected with the hydraulic cylinder push rod by the threaded hole on top, baffle plate (8) and impact anvil (9) also tighten together by load transducer (7) lower thread hole and load transducer (7), the displacement transducer top is H to the height of base, after installing sequin sample and little steel ball, little jumper bar top is to the height H 1 of base, H＞H.
2. novel little jumper bar test deflection displacement measuring mechanism as claimed in claim 1 is characterized in that baffle plate (8) is run into displacement transducer (4) earlier, and impact anvil (9) is just run into little jumper bar (1) then.
3. novel little jumper bar test deflection displacement measuring mechanism as claimed in claim 1 is characterized in that load transducer (7) is when having sensed load, and the shift value of setting the displacement transducer (4) of this moment is an initial displacement.
4. novel little jumper bar test deflection displacement measuring mechanism as claimed in claim 1 is characterized in that lower chuck (6) has a lower chuck through hole (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320108271 CN2697630Y (en) | 2003-11-24 | 2003-11-24 | Deflection displacement measuring mechanism for small impact bar test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320108271 CN2697630Y (en) | 2003-11-24 | 2003-11-24 | Deflection displacement measuring mechanism for small impact bar test |
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| Publication Number | Publication Date |
|---|---|
| CN2697630Y true CN2697630Y (en) | 2005-05-04 |
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| CN 200320108271 Expired - Fee Related CN2697630Y (en) | 2003-11-24 | 2003-11-24 | Deflection displacement measuring mechanism for small impact bar test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004056A (en) * | 2010-12-24 | 2011-04-06 | 上海交通大学 | Self-piercing riveting quality online detection system and method |
| CN103063529A (en) * | 2013-01-04 | 2013-04-24 | 中国原子能科学研究院 | Small punch testing method for reactor pressure vessel steel |
| CN106546493A (en) * | 2016-11-04 | 2017-03-29 | 中国原子能科学研究院 | It is a kind of can direct measurement amount of deflection little jumper bar test device |
| CN108693026A (en) * | 2017-12-22 | 2018-10-23 | 宁波诺丁汉大学 | A kind of small punch test system and its test method based on acoustic emission sensor |
| CN112924278A (en) * | 2021-01-27 | 2021-06-08 | 中国科学院近代物理研究所 | Small punch testing device and method for high-energy heavy ion irradiation sample |
-
2003
- 2003-11-24 CN CN 200320108271 patent/CN2697630Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004056A (en) * | 2010-12-24 | 2011-04-06 | 上海交通大学 | Self-piercing riveting quality online detection system and method |
| CN103063529A (en) * | 2013-01-04 | 2013-04-24 | 中国原子能科学研究院 | Small punch testing method for reactor pressure vessel steel |
| CN106546493A (en) * | 2016-11-04 | 2017-03-29 | 中国原子能科学研究院 | It is a kind of can direct measurement amount of deflection little jumper bar test device |
| CN108693026A (en) * | 2017-12-22 | 2018-10-23 | 宁波诺丁汉大学 | A kind of small punch test system and its test method based on acoustic emission sensor |
| CN112924278A (en) * | 2021-01-27 | 2021-06-08 | 中国科学院近代物理研究所 | Small punch testing device and method for high-energy heavy ion irradiation sample |
| CN112924278B (en) * | 2021-01-27 | 2022-09-27 | 中国科学院近代物理研究所 | Small punch testing device and method for high-energy heavy ion irradiation sample |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |