CN103983509A - Stress entire curve testing device and method - Google Patents
Stress entire curve testing device and method Download PDFInfo
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- CN103983509A CN103983509A CN201410236062.2A CN201410236062A CN103983509A CN 103983509 A CN103983509 A CN 103983509A CN 201410236062 A CN201410236062 A CN 201410236062A CN 103983509 A CN103983509 A CN 103983509A
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- extensometer
- guide rod
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- test
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Abstract
The invention discloses a stress entire curve testing device which comprises an extensometer and an extensometer fixing rack, and is characterized in that the extensometer fixing rack comprises an upper lantern ring and a lower lantern ring, wherein a telescopic guide rod is arranged between the two lantern rings; the extensometer is arranged on the extensometer and is connected with a testing machine; the height of the extensometer fixing rack is not less than the height of a test piece; the periphery of the extensometer fixing rack is not contacted with the test piece. After the installation is ended, the height of a test piece fixing rack is not less than the height of the test piece, and the extensometer fixing rack is arranged between upper and lower pressing plates of the testing machine; the testing machine is started, so that the upper and lower pressing plates compress the telescopic guide rod and are contacted with the test piece; the upper and lower pressing plates compress the test piece to apply a load to preset entrance force and the testing machine is paused; two knife edges of the extensometer are respectively bound to a concave rod and a convex rod, the extensometer and the telescopic guide rod can deform together, and the data acquisition end of the extensometer is connected with the testing machine; the testing machine is continuously operated, deformation of the extensometer serves as a loading rate control signal to be continuously loaded until a test target value reaches, and a load value of the testing machine and a deformation value of the extensometer are recorded.
Description
Technical field
The present invention relates to experimental technique field, hard brittle material pressurized full curve test unit and the methods such as especially a kind of concrete or rock.
Background technology
Concrete strain-stress relation is the calculating of reinforced concrete member intensity, hyperstatic structure internal force analysis, structure ductility calculates and the basis of RC finite element analysis.In decades, people have done to make great efforts widely, research concrete stress-strain stress relation.Concrete pressurized and tension stress strain full curve, can fine reflection its basic mechanical characteristic, be one of the Main Basis of intensity, distortion, damage and the fracture theory of research xoncrete structure and reinforced concrete structure.
But concrete belongs to accurate hard brittle material, the experimental technique that obtains its ess-strain full curve is more difficult.Through constantly making great efforts and attempting, scientific research personnel finds that it is mainly the important conclusion causing due to testing machine insufficient rigidity that Brittleness of Concrete destroys gradually, and a lot of scholars started to adopt the testing machine that rigidity is very large to carry out the experimental study of concrete full curve afterwards.Nearly stage achievement in research shows, servo apply hydraulic pressure testing machine is such as MTS and INSTRON are deformed into and control that to carry out full curve test effect better according to displacement or test specimen itself.
If expect effective concrete stress strain full curve, must gather in test test piece deformation value accurately.And when concrete is when pressurized reaches or approach peak load, test specimen inside and surface start to occur crack, and while continuing to load, test specimen surface even can come off, at test specimen surface stickup foil gauge or binding extensometer, all can be affected, cannot overall process collect authentic and valid distortion.And the displacement of testing machine self is owing to there being various linkings gap, also can only be as a reference.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a kind of test unit, extensometer is fixed on this device can overall process gather test piece deformation, is not subject to test specimen to reach the impact damaging after peak value, and gathers the distortion that shift value only includes test specimen.
For addressing the above problem, the present invention adopts following technical scheme:
A pressurized full curve test unit, comprises extensometer and extensometer fixed mount, it is characterized in that: extensometer fixed mount comprises upper and lower two collars, and flexible guide rod is arranged between two collars, and extensometer is arranged on joint test machine on flexible guide rod; Extensometer fixed mount height is not less than height of specimen, and extensometer fixed mount surrounding does not contact with test specimen.
Preferably, flexible guide rod comprises recessed bar and the nose bar of two concavo-convex docking, and recessed bar has groove, is provided with spring in groove, and nose bar projection stretches in groove and spring contact, and the diameter of the linkage section of nose bar and recessed bar is greater than spring inside diameter; Extensometer two edges of a knife are bundled in respectively on recessed bar and nose bar.
Preferably, within one week, be provided with the circular hole passing for flexible guide rod along the collar, flexible guide rod two ends connect bearing.
Preferably, bearing is universal spherical joint supporter, and universal spherical joint supporter is provided with the hickey being connected with the guide rod that stretches.
Preferably, the collar is circular, along 90 ° of one-week intervals, 120 °, four circular holes or interval is set three circular holes are set, and flexible guide rod two ends and collar installation position diameter are less than Circularhole diameter, and interlude diameter is greater than Circularhole diameter.
Preferably, the collar is square, along 90 ° of one-week intervals, four circular holes is set, and flexible guide rod two ends and collar installation position diameter are less than Circularhole diameter, and interlude diameter is greater than Circularhole diameter.
Preferably, extensometer fixed mount material therefor is alloy in lightweight.
A test method for pressurized full curve test unit, comprises following several step:
One, installation test device: first place lower collar, test specimen is put in the middle of the collar, nose bar stretches into recessed bar and spring contact, the guide rod that will stretch inserts collar circular hole around, from collar bottom, universal spherical joint supporter and flexible guide rod are tightened simultaneously, then upper collar is installed, the collar is enclosed within to test specimen outside, circular hole, through flexible guide rod upper external screw thread section, is tightened universal spherical joint supporter above the collar;
After installing, the height of test specimen fixed mount is not less than height of specimen, and extensometer fixed mount is arranged on testing machine between lower platen;
Two, starting characteristics test machine, make the flexible guide rod of lower platen compression and contact test specimen, upper lower platen compresses test specimen load application and suspend testing machine to default entrance power, extensometer two edges of a knife are bundled in respectively on recessed bar and nose bar, can be out of shape together in company with flexible guide rod extensometer data acquisition end joint test machine;
Three, continue starting characteristics test machine, the distortion of extensometer of usining continues to load as loading velocity control signal, until be loaded into test objective value, records payload values and the extensometer deformation values of testing machine.
The present invention has following beneficial effect: extensometer fixed mount is not to depend on test specimen, thus test specimen ftracture even that surface comes off not can related fixed mount, so extensometer is located on this fixed mount, whole process can be stablized image data; This fixed mount is to be placed on testing machine between lower platen, the data that gather are the displacement between lower platen on testing machine, and after pressing plate compacting test specimen upper and lower surface, relative displacement between upper lower platen is exactly the distortion of test specimen, that is to say that, by this fixed mount, extensometer has only gathered the deformation values of test specimen.Convenient disassembly, keeping for convenience detach after off-test.
Accompanying drawing explanation
Fig. 1: pressurized full curve test unit structural representation of the present invention;
Fig. 2: extensometer fixed rack structure schematic diagram;
Fig. 3: flexible guide rod structure schematic diagram;
Fig. 4: a kind of thimble structure schematic diagram;
Fig. 5: a kind of thimble structure schematic diagram;
Fig. 6: a kind of thimble structure schematic diagram.
Embodiment
By reference to the accompanying drawings, the present invention is described in further details.
A pressurized full curve test unit, comprises extensometer 1 and extensometer fixed mount 2, and extensometer fixed mount 2 comprises upper and lower two collars 21, and flexible guide rod 22 is arranged between two collars 21, and extensometer 1 is arranged on joint test machine on flexible guide rod 22; Extensometer fixed mount 2 is highly not less than test specimen 3 height, and extensometer fixed mount 2 surroundings do not contact with test specimen 3.
Flexible guide rod 22 comprises recessed bar 23 and the nose bar 24 of two concavo-convex docking, recessed bar 23 has groove, in groove, be provided with spring 25, nose bar 24 projections stretch in groove and contact with spring 25, nose bar 24 is greater than spring 25 internal diameters with the diameter of the linkage section of recessed bar 23,1 liang of edge of a knife of extensometer is bundled in respectively on recessed bar 23 and nose bar 24, and flexible guide rod 22 two ends are provided with hickey 26.Along the collar, within 21 1 weeks, be provided with the circular hole 27 passing for flexible guide rod 22, flexible guide rod 22 two ends connect universal spherical joint supporter 28, and universal spherical joint supporter 28 is provided with the hickey being connected with flexible guide rod 22.The collar 21 is circular or square, along 90 ° of one-week intervals, 120 °, four circular holes 27 or interval is set three circular holes 27 are set, and flexible guide rod 22 two ends and the collar 21 installation position diameters are less than circular hole 27 diameters, and interlude diameter is greater than circular hole 27 diameters.
Extensometer fixed mount 2 material therefors are alloy in lightweight.
A test method for pressurized full curve test unit, comprises following several step:
One, installation test device: first place lower collar, test specimen is put in the middle of the collar, nose bar stretches into recessed bar and spring contact, the guide rod that will stretch inserts collar circular hole around, from collar bottom, universal spherical joint supporter and flexible guide rod are tightened simultaneously, then upper collar is installed, the collar is enclosed within to test specimen outside, circular hole, through flexible guide rod upper external screw thread section, is tightened universal spherical joint supporter above the collar;
After installing, the height of test specimen fixed mount is not less than height of specimen, and extensometer fixed mount is arranged on testing machine between lower platen;
Two, starting characteristics test machine, make the flexible guide rod of lower platen compression and contact test specimen, upper lower platen compresses test specimen load application and suspend testing machine to default entrance power, extensometer two edges of a knife are bundled in respectively on recessed bar and nose bar, can be out of shape together in company with flexible guide rod extensometer data acquisition end joint test machine;
Three, continue starting characteristics test machine, the distortion of extensometer of usining continues to load as loading velocity control signal, until be loaded into test objective value, records payload values and the extensometer deformation values of testing machine.
The effect of the collar is the vertical flexible guide rod of frame, after the flexible guide rod of the collar and surrounding clamps, forms a frame system, and test specimen is as in the middle of this frame system, and framework does not contact with test specimen, is not subject to test specimen destroying infection, only measures the compressive deformation of the whole height of test specimen.
The effect of universal spherical joint supporter is: if while occurring in pressurized process that upper lower platen has inclination, can follow pressing plate and adjust together.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, can carry out variations and modifications to the present invention.
Claims (7)
1. a pressurized full curve test unit, comprises extensometer and extensometer fixed mount, it is characterized in that: extensometer fixed mount comprises upper and lower two collars, and flexible guide rod is arranged between two collars, and extensometer is arranged on joint test machine on flexible guide rod; Extensometer fixed mount height is not less than height of specimen, and extensometer fixed mount surrounding does not contact with test specimen.
2. pressurized full curve test unit according to claim 1, it is characterized in that: flexible guide rod comprises recessed bar and the nose bar of two concavo-convex docking, recessed bar has groove, in groove, be provided with spring, nose bar projection stretches in groove and spring contact, and the diameter of the linkage section of nose bar and recessed bar is greater than spring inside diameter; Extensometer two edges of a knife are bundled in respectively on recessed bar and nose bar.
3. pressurized full curve test unit according to claim 1, is characterized in that: along the collar, within one week, be provided with the circular hole passing for flexible guide rod, flexible guide rod two ends connect bearing.
4. pressurized full curve test unit according to claim 3, is characterized in that: bearing is universal spherical joint supporter, and universal spherical joint supporter is provided with the hickey being connected with the guide rod that stretches.
5. according to any pressurized full curve test unit described in claim 1-4, it is characterized in that: the collar is for circular, along 90 ° of one-week intervals, 120 °, four circular holes or interval is set three circular holes are set, flexible guide rod two ends and collar installation position diameter are less than Circularhole diameter, and interlude diameter is greater than Circularhole diameter.
6. according to any pressurized full curve test unit described in claim 1-4, it is characterized in that: the collar is square, along 90 ° of one-week intervals, four circular holes are set, flexible guide rod two ends and collar installation position diameter are less than Circularhole diameter, and interlude diameter is greater than Circularhole diameter.
7. the test method of any pressurized full curve test unit described in claim 1-4, is characterized in that comprising following several step:
One, installation test device: first place lower collar, test specimen is put in the middle of the collar, nose bar stretches into recessed bar and spring contact, the guide rod that will stretch inserts collar circular hole around, from collar bottom, universal spherical joint supporter and flexible guide rod are tightened simultaneously, then upper collar is installed, the collar is enclosed within to test specimen outside, circular hole, through flexible guide rod upper external screw thread section, is tightened universal spherical joint supporter above the collar;
After installing, the height of test specimen fixed mount is not less than height of specimen, and extensometer fixed mount is arranged on testing machine between lower platen;
Two, starting characteristics test machine, make the flexible guide rod of lower platen compression and contact test specimen, upper lower platen compresses test specimen load application and suspend testing machine to default entrance power, extensometer two edges of a knife are bundled in respectively on recessed bar and nose bar, can be out of shape together in company with flexible guide rod extensometer data acquisition end joint test machine;
Three, continue starting characteristics test machine, the distortion of extensometer of usining continues to load as loading velocity control signal, until be loaded into test objective value, records payload values and the extensometer deformation values of testing machine.
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| CN201410236062.2A CN103983509A (en) | 2014-05-29 | 2014-05-29 | Stress entire curve testing device and method |
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| CN201410236062.2A CN103983509A (en) | 2014-05-29 | 2014-05-29 | Stress entire curve testing device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352797A (en) * | 2015-10-27 | 2016-02-24 | 河海大学 | Magnetic device and method for fixing rock axial tensile specimen extensometer auxiliary assembly |
| CN108562489A (en) * | 2018-03-29 | 2018-09-21 | 北京交通大学 | A kind of displacement measuring device and testing machine suitable for material tensile test |
| CN109060518A (en) * | 2018-10-29 | 2018-12-21 | 常熟正昊电子科技有限公司 | A kind of tensile test fixture of long test specimen |
| CN111964568A (en) * | 2020-07-24 | 2020-11-20 | 中国航空工业集团公司济南特种结构研究所 | Method for testing micro deformation of sandwich structure or core under compression load |
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| CN108562489A (en) * | 2018-03-29 | 2018-09-21 | 北京交通大学 | A kind of displacement measuring device and testing machine suitable for material tensile test |
| CN108562489B (en) * | 2018-03-29 | 2024-03-19 | 北京交通大学 | Displacement measurement device and testing machine suitable for material tensile test |
| CN109060518A (en) * | 2018-10-29 | 2018-12-21 | 常熟正昊电子科技有限公司 | A kind of tensile test fixture of long test specimen |
| CN111964568A (en) * | 2020-07-24 | 2020-11-20 | 中国航空工业集团公司济南特种结构研究所 | Method for testing micro deformation of sandwich structure or core under compression load |
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Application publication date: 20140813 |