CN104458452A - Compression and relaxation testing device - Google Patents
Compression and relaxation testing device Download PDFInfo
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- CN104458452A CN104458452A CN201410674737.1A CN201410674737A CN104458452A CN 104458452 A CN104458452 A CN 104458452A CN 201410674737 A CN201410674737 A CN 201410674737A CN 104458452 A CN104458452 A CN 104458452A
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Abstract
The invention relates to a compression and relaxation testing device. The device comprises a test table for placing of testing samples, a guide rail assembly, a hammer which is arranged in the length direction of the guide rail assembly and capable of sliding relative to the guide rail assembly, a releasing mechanism in separated connection with the hammer, and a lifting mechanism which is connected with the releasing mechanism and is used for lifting the hammer to a specified height, wherein the hammer is used for compressing and loading the testing samples. Particularly, the compression and relaxation testing device further comprises a locking mechanism. When the hammer compresses and loads the testing samples to the maximum compression amount, the hammer and the guide rail assembly are relatively locked by the locking mechanism. The compression and relaxation testing device disclosed by the invention can be used for realizing the loading of the high strain rate of the tested testing samples. When the hammer moves to the specified position, displacement locking is performed on the hammer by the locking mechanism, and the hammer is kept still for an enough long term.
Description
Technical field
The invention belongs to material mechanical performance dynamic test and representational field, for the industry such as automobile, aviation, have and relate to a kind of compression stress relaxation test unit.
Background technology
Elastomeric material is very extensive in the application of automobile industry, as tire, engine mounting, door weather strip, crash tests dummy etc.The crash tests dummy finite element model that Research on Mechanical Properties under elastomeric material high strain-rate has the prediction of accurate mechanical response for the crashworthiness and foundation that improve automobile is significant.
In vehicle impact testing, the rubbery material parts rate of deformation of test dummy can reach 100/s, the mechanical behavior of the rubber under this Dynamic Loading and quasistatic condition significant difference.For the dynamic mechanical of accurate description rubber, the result of stress relaxation test or creep test is essential.Dissimilar rubber, its stress decay speed is also different.Dummy---Hybrid type III dummy is used for the head-on crash specified in C-NACP test, the stress of its neck elastomeric material can decay more than 50% in 0.1s, when therefore stress relaxation test being carried out to this kind of material, loading procedure is sufficiently rapid, and process of the test requires that sample remains on constant strain, and continuing the longer time, this proposes higher requirement to testing apparatus.
Common drop-weight test platform, the tup movement of falling object realizes high speed compression test, but uncontrollable tup displacement, electronic universal tester adopts loop control theory, can controlled loading displacement, two-forty compression test cannot be implemented, although and hydraulic high speed tensile test machine can realize quick washing and loads, but because adopt opened loop control, uncontrollable load deflection.Existing rubber stress relaxation experimental facilities, for mainly rubber ageing process in STRESS VARIATION, can not rapid loading be realized.
Summary of the invention
Technical matters to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of compression stress relaxation test unit that can realize loading the high strain-rate of tested sample.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of compression stress relaxation test unit, comprise the testing table for placing test sample, guide assembly, length direction and described guide assembly along described guide assembly slide the block stamp arranged mutually, with the separable releasing mechanism that is connected of described block stamp and be connected with described releasing mechanism and lifting mechanism for described block stamp being risen to specified altitude assignment, described block stamp is used for carrying out compression-loaded to described sample, described compression stress relaxation test unit also comprises locking mechanism, when the compression-loaded of described block stamp to described sample reaches maximum compressibility, described locking mechanism locks relative with described guide rod assembly for described block stamp.
Described locking mechanism comprise the slide block that is slidably connected with described block stamp and be fixedly connected with described guide assembly and there is the block piece of container cavity, the glide direction of described slide block is from top to bottom tilt to extend to the direction away from described block stamp, described locking mechanism has lock-out state and released state, when in a locked condition, described slide block to slip in described container cavity along with described block stamp and to offset with the inwall of described container cavity, and described block stamp is relative with described guide assembly to be locked; When being in released state, the inwall of described slide block and described container cavity does not offset.
The lateral surface of described block stamp is formed with the lug boss be connected with described skid, described lug boss offers slide block chamber along the glide direction of described slide block, one sidepiece of described slide block can be slidably arranged in described slide block chamber along described slide block chamber, the other side of described slide block extends to outside described slide block chamber, when described locking mechanism is in the lock state, described the other side of described slide block and the inwall of described container cavity offset.
Described slide block is wedge block, the bevel direction of the dip plane of described wedge block is parallel with the glide direction of described slide block, the face relative with described dip plane of described wedge block is vertical plane, described vertical plane is parallel with the glide direction of described block stamp, when described locking mechanism is in the lock state, the inwall of described vertical plane and described container cavity offsets.
The upper end of described slide block is provided with pull bar, and an end of described pull bar passes from the chamber wall of described slide block chamber and extends to described slide block chamber.
Elastic component is provided with between described slide block and described block stamp.
Described guide assembly comprises two semicircular conduits be fixed together vertically arranged, the tube chamber of two described conduits forms the track for sliding for described block stamp jointly, length direction along described conduit between two described conduits is formed with space, described slide block is extend to described track from described space outer and can slide along the length direction in described space, when described locking mechanism is in the lock state, the part of stretching out outside described track of described slide block pushes against with the inwall of described container cavity.
Described block stamp comprise there is cavity block stamp body, with an end of described block stamp body be detachably fixedly connected with for close described cavity block stamp end cap, be formed on described block stamp end cap and the connecting link that extends to described cavity inside of one end and multiple balancing weights of removably connecting with described connecting link.
Described releasing mechanism comprises the electromagnet be connected with described lifting mechanism by wire rope and the solenoid valve be electrically connected with described electromagnet, and described solenoid valve is for controlling described electromagnet and to be connected with block stamp or described electromagnet discharging described block stamp.
Described compression stress relaxation test unit also comprises and stores force mechanisms, the described force mechanisms that stores comprises and stores power spring, when described releasing mechanism is connected with described block stamp, described in store power spring the upper end of one end and described block stamp push against, and the other end and described guide assembly push against.
Due to the enforcement of above technical scheme, the present invention compared with prior art has following advantages:
Compression stress relaxation test unit of the present invention can realize loading the high strain-rate of tested sample, when block stamp motion reaches assigned address, locking mechanism implements displacement locking to it, block stamp maintenance is static and long enough, the distortion of sample and load in the whole process of data acquisition equipment record, by simply calculating the dynamic stress relaxation curve that just can obtain sample.
The locking mechanism structure of compression stress relaxation test unit of the present invention is simple, is quick on the draw, and low cost of manufacture is safe and reliable.
Accompanying drawing explanation
Fig. 1 is the structural representation of compression stress relaxation test unit of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view (not showing lifting mechanism);
Fig. 3 is the longitudinal sectional view (not showing lifting mechanism) under the locking mechanism of compression stress relaxation test unit of the present invention is in the lock state;
Fig. 4 is B place enlarged drawing in Fig. 3;
Fig. 5 is the front view of the block stamp of compression stress relaxation test unit of the present invention;
Fig. 6 be in figure C-C to cut-open view;
Fig. 7 is D place enlarged drawing in Fig. 6;
Fig. 8 is the side view of the block stamp of compression stress relaxation test unit of the present invention;
Fig. 9 be in Fig. 8 E-E to cut-open view;
In figure: 1, lifting mechanism; 2, wire rope; 3, electromagnet; 4, power spring is stored; 5, block stamp; 6, block stamp body; 7, block stamp end cap; 8, connecting link; 9, balancing weight; 10, lug boss; 11, slide block chamber; 12, slide block; 13, pull bar; 14, draw ring; 15, elastic component; 16, guide rod assembly; 17, block piece; 18, container cavity; 19, sample; 20, testing table; 21, cushion pad.
Embodiment
Below in conjunction with Figure of description, the present invention is described further:
As shown in accompanying drawing 1 ~ 9, a kind of compression stress relaxation test unit, comprise the testing table 20 for placing test sample 19, guide assembly 16, length direction and guide assembly 16 phase along guide assembly 16 are slided the block stamp 5 arranged, with the separable releasing mechanism that is connected of block stamp 5 and be connected with releasing mechanism and lifting mechanism 1 for block stamp 5 being risen to specified altitude assignment, block stamp 5 to be positioned at above sample 19 and for carrying out compression-loaded to sample 19, this compression stress relaxation test unit also comprises locking mechanism, when the compression-loaded of block stamp 5 to test 19 reaches maximum compressibility, locking mechanism locks relative with guide rod assembly 16 for block stamp 5.
Locking mechanism comprises the slide block 12 be slidably connected with block stamp 5 and the block piece 17 with container cavity 18 be fixedly connected with guide assembly 16, the glide direction of slide block 12 is from top to bottom tilt to extend to the direction away from block stamp 5, locking mechanism has lock-out state and released state, when in a locked condition, slide block 12 to slip in container cavity 18 along with block stamp 5 and to offset with the inwall of container cavity 18, and block stamp 5 is relative with guide assembly 16 to be locked; When being in released state, slide block 12 does not push against with the inwall of container cavity 18.
The lateral surface of block stamp 5 is formed with the lug boss 10 be slidably connected with slide block 12, lug boss 10 offers slide block chamber 11 along the glide direction of slide block 12, one sidepiece of slide block 12 can be slidably arranged in slide block chamber 11 along slide block chamber 11, the other side of slide block 12 extends to outside slide block chamber 11, when locking mechanism is in the lock state, described the other end of slide block 12 and the inwall of container cavity 18 offset.
Particularly, slide block 12 is wedge block, and the bevel direction of the dip plane of wedge block is parallel with the glide direction of slide block 12.Preferably, the face relative with dip plane of wedge block is vertical plane, and vertical plane is parallel with the glide direction of block stamp 5, and when locking mechanism is in the lock state, the inwall of this vertical plane and container cavity 18 offsets.
Be provided with pull bar 13 in the upper end of slide block 12, an end of pull bar 13 passes from the chamber wall of slide block chamber 11 and extends to slide block chamber 11.For the ease of operation, that end being positioned at slide block chamber 11 of pull bar 13 is provided with draw ring 14.
Be provided with elastic component 15 between slide block 12 and block stamp 5, particularly, elastic component 15 is spring, and spring housing is located on pull bar 13.
Guide assembly 16 of the present invention comprises two semicircular conduits be fixed together vertically arranged, the tube chamber of two conduits forms the track for sliding for block stamp 5 jointly, length direction along conduit between two conduits is formed with space, slide block 12 extends to from space track and also can slide along the length direction in space, when locking mechanism is in the lock state, the part of stretching out outside track of slide block 12 pushes against with the inwall of container cavity 18.
Block stamp of the present invention comprise there is cavity block stamp body 6, with an end of block stamp body 6 be detachably fixedly connected with for close this cavity block stamp end cap 7, be formed on block stamp end cap 7 and the connecting link 8 that extends to this cavity inside of one end and multiple balancing weights 9 of removably connecting with connecting link 8.Be threaded connection between block stamp end cap 7 and block stamp body 6, be also threaded connection between balancing weight 9 and connecting link 8, so just according to test needs, the balancing weight of Different Weight can be selected.
Releasing mechanism of the present invention comprises the electromagnet 3 be connected with lifting mechanism 1 by wire rope 2 and the solenoid valve be electrically connected with electromagnet 3, and solenoid valve is for controlling electromagnet 3 and to be connected with block stamp 5 or electromagnet 3 discharging block stamp 5.
Compression stress relaxation test unit of the present invention also comprises and stores force mechanisms, store force mechanisms to comprise and store power spring 4, the bearing of trend storing power spring 4 is identical with the glide direction of block stamp 5, when releasing mechanism is connected with block stamp 5, the one end and the block stamp 5 that store power spring 4 push against, and the other end and guide assembly 16 push against.
Compression stress relaxation test unit of the present invention, when testing sample 19, places dynamometer between sample 19 and testing table 20, and in order to prevent sample 19 to be extruded in process of the test, the both sides that dynamometer is positioned at sample 19 arrange cushion pad 21.
The principle of work of compression stress relaxation test unit of the present invention:
The electromagnet 3 of releasing mechanism is connected with block stamp 5 by the control of solenoid valve, lifting mechanism 1 is by wire rope 2 Connection Release mechanism, block stamp 5 is risen to specified altitude assignment by lifting mechanism 1, block stamp 5 slides up and down in the conduit of guide assembly 16, utilize gravitational energy to change into impact velocity kinetic energy, and the power that the stores spring 4 on block stamp 5 top can provide extra impact velocity.When releasing mechanism release block stamp 5, block stamp 5 is along the downward landing of the track be made up of two semicircular conduits, block stamp 5 lower surface compresses the sample 19 be placed on testing table 20, in compression process, and block stamp 5 kinetic energy dissipation, speed reduces until be zero, at this time block stamp 5 starts the trend producing direction motion, and now, locking mechanism starts, the inwall of the vertical plane of wedge block and the container cavity 18 of block piece 17 offsets, and block stamp 5 is by locking.Thus a constant strain is produced to sample 19.Block stamp 5 is loading procedure from contact sample to this process that decrement is maximum, and strain maintains the process that constant process is stress relaxation.
When completing the compression stress relaxation test to sample 19, with pulling draw ring 14, pull slide block 12 upward sliding, slide block 12 Compress Spring elastic component 15, slide block 12 slides in slide block chamber 11, removes pushing against of the inwall of slide block 12 and container cavity 18, and then unlock lock mechanism, holding draw ring 14 continues upwards, is up promoted until be connected with electromagnet by whole block stamp 5, then changes the test that sample just can carry out next sample.
Upper and lower position described in the present invention relation is all with for referencial use under the state shown in Fig. 1.
Above to invention has been detailed description; its object is to allow the personage being familiar with this art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; the equivalence change that all Spirit Essences according to the present invention are done or modification, all should be encompassed in protection scope of the present invention.
Claims (10)
1. a compression stress relaxation test unit, comprise the testing table for placing test sample, guide assembly, along the block stamp that the length direction of described guide assembly is arranged mutually slidably with described guide assembly, with the separable releasing mechanism that is connected of described block stamp and be connected with described releasing mechanism and lifting mechanism for described block stamp being risen to specified altitude assignment, described block stamp is used for carrying out compression-loaded to described sample, it is characterized in that: described compression stress relaxation test unit also comprises locking mechanism, when the compression-loaded of described block stamp to described sample reaches maximum compressibility, described locking mechanism locks relative with described guide rod assembly for described block stamp.
2. compression stress relaxation test unit according to claim 1, it is characterized in that: described locking mechanism comprise the slide block that is slidably connected with described block stamp and be fixedly connected with described guide assembly and there is the block piece of container cavity, the glide direction of described slide block is from top to bottom tilt to extend to the direction away from described block stamp, described locking mechanism has lock-out state and released state, when in a locked condition, described slide block to slip in described container cavity along with described block stamp and to offset with the inwall of described container cavity, described block stamp is relative with described guide assembly to be locked, when being in released state, the inwall of described slide block and described container cavity does not offset.
3. compression stress relaxation test unit according to claim 2, it is characterized in that: the lateral surface of described block stamp is formed with the lug boss be connected with described skid, described lug boss offers slide block chamber along the glide direction of described slide block, one sidepiece of described slide block can be slidably arranged in described slide block chamber along described slide block chamber, the other side of described slide block extends to outside described slide block chamber, when described locking mechanism is in the lock state, described the other side of described slide block and the inwall of described container cavity offset.
4. compression stress relaxation test unit according to claim 3, it is characterized in that: described slide block is wedge block, the bevel direction of the dip plane of described wedge block is parallel with the glide direction of described slide block, the face relative with described dip plane of described wedge block is vertical plane, described vertical plane is parallel with the glide direction of described block stamp, when described locking mechanism is in the lock state, the inwall of described vertical plane and described container cavity offsets.
5. compression stress relaxation test unit according to claim 2, is characterized in that: the upper end of described slide block is provided with pull bar, and an end of described pull bar passes from the chamber wall of described slide block chamber and extends to described slide block chamber.
6. compression stress relaxation test unit according to claim 2, is characterized in that: be provided with elastic component between described slide block and described block stamp.
7. compression stress relaxation test unit according to claim 1, it is characterized in that: described guide assembly comprises two semicircular conduits be fixed together vertically arranged, the tube chamber of two described conduits forms the track for sliding for described block stamp jointly, length direction along described conduit between two described conduits is formed with space, described slide block is extend to described track from described space outer and can slide along the length direction in described space, when described locking mechanism is in the lock state, the part of stretching out outside described track of described slide block pushes against with the inwall of described container cavity.
8. compression stress relaxation test unit according to claim 1, is characterized in that: described block stamp comprise there is cavity block stamp body, with an end of described block stamp body be detachably fixedly connected with for close described cavity block stamp end cap, be formed on described block stamp end cap and the connecting link that extends to described cavity inside of one end and multiple balancing weights of removably connecting with described connecting link.
9. compression stress relaxation test unit according to claim 1, it is characterized in that: described releasing mechanism comprises the electromagnet be connected with described lifting mechanism by wire rope and the solenoid valve be electrically connected with described electromagnet, described solenoid valve is for controlling described electromagnet and to be connected with block stamp or described electromagnet discharging described block stamp.
10. compression stress relaxation test unit according to claim 1, it is characterized in that: described compression stress relaxation test unit also comprises and stores force mechanisms, the described force mechanisms that stores comprises and stores power spring, when described releasing mechanism is connected with described block stamp, one end of the described power of storing spring and the upper end of described block stamp push against, and the other end and described guide assembly push against.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410674737.1A CN104458452B (en) | 2014-11-21 | 2014-11-21 | A kind of compression stress relaxation experimental rig |
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| CN201410674737.1A CN104458452B (en) | 2014-11-21 | 2014-11-21 | A kind of compression stress relaxation experimental rig |
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| CN104458452A true CN104458452A (en) | 2015-03-25 |
| CN104458452B CN104458452B (en) | 2017-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107255569A (en) * | 2017-06-14 | 2017-10-17 | 中车齐齐哈尔车辆有限公司 | Longitudinal dynamic loading test device |
| CN114323995A (en) * | 2021-12-22 | 2022-04-12 | 中国科学院金属研究所 | Device and method for measuring stress relaxation resistance of metal material |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104458452B (en) | 2017-07-07 |
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