CN206095770U - Can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment - Google Patents
Can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment Download PDFInfo
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- CN206095770U CN206095770U CN201620844930.XU CN201620844930U CN206095770U CN 206095770 U CN206095770 U CN 206095770U CN 201620844930 U CN201620844930 U CN 201620844930U CN 206095770 U CN206095770 U CN 206095770U
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- container
- shape memory
- memory alloy
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- sleeve pipe
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Abstract
The utility model discloses a can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment, container (6) and sleeve pipe (7), connected container and sheathed tube fastening internal thread circle (4) and rubber circle (5) and corresponding chuck including splendid attire liquid. The utility model discloses test fixture can be used to arrange material sample in different liquid ring borders, is applicable to unipolar or the multiaxis fatigue test of shape memory alloy in different liquid medium, has simple structure, and is multiple functional, and processing is convenient, and economy is suitable for, and the leakproofness is good, the advantage such as can use repeatedly.
Description
Technical field
The utility model belongs to intellectual material thermodynamic property technical field of measurement and test, and especially niti-shaped memorial alloy exists
Fatigue experiment field under different liquids environment.
Background technology
Due to working environment it is larger to the Effect on Mechanical Properties of material, therefore carry out different liquids such as water, oil, electrolysis
The mechanical behavior of material tests the design to component and safety evaluatio in the environment such as matter, acid solution very important meaning.
In recent decades, marmem is wide because of its distinctive super-elasticity, SME and biocompatibility
General is applied to MEMS, biomedical, the field such as Aero-Space and automobile.Due to marmem device frequently as
Important element in engineering component, inevitably bears the cyclic load of various different frequencies during being actually on active service
And temperature action, its Service Environment includes the different medium such as seawater, human body fluid, water, oil and acid solution.Circular deformation behavior, damage
Wound accumulation and Fatigue Failures determine the service reliability and service life of device.Therefore, to different medium, different frequency
Under different temperatures, shape memory alloy material carries out circular deformation behavior and the experimental study of fatigue failure sets to device
Meter and reliability evaluation are of great significance.
Different from common metal, the rate correlation properties of marmem are due to its strong heating power in deformation process
What coupling caused.On the one hand, in inelastic deformation, the joint contribution of mechanical dissipation and latent heat of phase change can cause in alloy
Portion is thermally generated.Inside is thermally generated the heat transfer with alloy inside and border, thermal convection current formation competitive relation；It is very low in LOADING RATES
When, the heat inside alloy has time enough to carry out heat exchange by heat transfer and thermal convection current and alloy surrounding medium, and very
Dynamic equilibrium is reached soon, and alloy is similar to Isothermal Condition；And when LOADING RATES is very high, because deformation time is extremely short, internal heat is raw
Into having little time that heat exchange occurs with extraneous, alloy is approximately at adiabatci condition, and heat will be stranded in material internal and cause temperature
Significantly raise.On the other hand, the transformation stress of niti-shaped memorial alloy is strongly dependent on the temperature of material.The aspect of the above two
The strong dependency that result in marmem to LOADING RATES that influences each other of reason.
The rate associated fatigue of shape memory alloy material tested at present, experiment condition focus primarily upon 0.1HZ with
On upper frequency, and for more low-frequency fatigue experiment study it is then less.This is real mainly due to more low-frequency fatigue
It is oversize to test the used time, completes difficulty very big.Therefore, special rate associated fatigue experimental provision complete from low to high is developed
Fatigue failure assessment to marmem is very necessary.
However, existing experimental technique there are still many deficiencies：
（1）Existing rate associated fatigue is carried out in atmosphere mostly, for low-frequency fatigue experiment, as a consequence it is hardly possible to complete
Into；For air, the heat conductivity of liquid more preferably, tested sample is placed in different liquids environment so that shape is remembered
Recalling alloy internal heat can pass faster, so as to be equivalent to the low rate operating mode that material is carried out in atmosphere, can be with
The time-consuming too long problem of low frequency is efficiently solved, following in different liquids environment marmem can be also further studied
Annular strain characteristic and fatigue behaviour.
（2）Existing experimental study focuses primarily upon the bending of niti-shaped memorial alloy silk sample and torsion test, this
It is, because the testing machine for niti-shaped memorial alloy silk sample is less and be laterally disposed, directly can be placed in experimental machine
In water, and for the Multi-axial Loading MTS testing machines of tension and torsion, exploitation clamping sample is needed to seal up the folder of liquid again
Tool.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to set up a kind of carrying based on MTS testing machine systems
For the material shape memorial alloy fatigue test ware of liquid mediums environment, sample is set to be tested in different liquids environment
Testing of materials fixture, the fixture can well clamp sample, and good airproof performance, can be with Reusability.
The purpose of this utility model is realized by following means：A kind of shape that liquid mediums environment is provided
Shape memory alloys fatigue test of materials ware, including the container that can be used for splendid attire liquid（6）With the sample holder for being placed in container center
Mechanism；The sample clamping mechanism is mainly by upper grip（1）, lower chuck（3）And sleeve pipe（7）Composition；Sleeve pipe（7）Lower end for blind
Mouthful, external screw thread circle is equipped with the outside of upper end on platform；Sleeve pipe（7）Through container（6）Central through hole, fasten internal thread circle（4）Set
In sleeve pipe（7）External screw thread circle on, realize sleeve pipe（7）With container（6）Closed connection；Upper grip（1）And lower chuck（3）It is
There is the blind head pipe of opening side；When experiment is installed, tested cylinder sample upper and lower side inserts respectively upper grip（1）And lower chuck
（3）It is interior；Lower chuck（3）Plug-in-sleeve（7）It is interior.
Further, internal thread circle is fastened（4）With container（6）Rubber ring is provided between inner bottom surface（5）.
Further, the upper grip（1）And lower chuck（3）Internal diameter it is suitable with the external diameter of tested cylinder sample.
The utility model can provide the material shape memorial alloy fatigue test ware of liquid mediums environment for MTS controls
System and acquisition system, realization is positioned over sample in different liquids environment is tested.
The utility model is applied to various liquid environments, Ru Shui, oil, electrolyte, acid solution etc., can be used to study shape note
Recall fatigue failure behavior of the alloy in liquid mediums.
Description of the drawings
The overall structure diagram of system described in Fig. 1 the utility model experimental provisions.
The overall assembling schematic diagram of the sample, fixture block and container of Fig. 2 the utility model experimental provisions.
Modular construction schematic diagram of Fig. 3 the utility model experimental provisions in addition to container.
Modular construction assembling schematic diagram of Fig. 4 the utility model experimental provisions in addition to container.
What Fig. 5 the utility model experimental techniques measured under different frequency niti-shaped memorial alloy in liquid medium water should
Force-strain curve.
Fig. 6 the utility model experimental techniques measure the Temperature Evolution curve of niti-shaped memorial alloy in liquid medium water.
Specific embodiment
Below by accompanying drawing, device of the present utility model is described in further detail.
Fig. 1 give the utility model experimental provision it is unassembled before each structural elements schematic diagram.
Fig. 2 is the overall schematic in Fig. 1 after the completion of each structural elements assembling.
Fig. 3 is all parts structural representation of the fixture in addition to container.
Fig. 4 is the schematic diagram in Fig. 3 after the completion of each structural elements assembling.
Fig. 5 is first in single shaft fatigue experiment of the niti-shaped memorial alloy under two kinds of frequencies in air and water
The load-deformation curve comparison diagram of circle and last lap.
Fig. 6 is in single shaft fatigue experiment of the niti-shaped memorial alloy under two kinds of frequencies in air and water four
Plant the Temperature Evolution curves of front 100 circle under operating mode.
Embodiment
Implement such as Fig. 1, after being completed as shown in Figure 2.Marmem tested sample 2 is thin micro tube, is tested
When, the upper and lower ends of sample 2 are blocked with two rigid plugs, then the two ends of sample 2 are clamped with lower chuck.On chuck
End is relatively large in diameter, and has step, and it act as preventing sample from falling in sleeve pipe 7.
Container 6 is to take up the container of liquid, on the one hand, the size of the container should be able to contain the liquid of 500ml, this be due to
Marmem is very sensitive to temperature, and the change of temperature can cause the change of its mechanical behavior, container 6 to ensure whole
The shortage of heat that sample 2 is discharged during fatigue test is so that liquid environment temperature changes.On the other hand, the diameter of container is big
In the diameter of testing machine upper grip, so as to ensure that sample 2 can be completely immersed in Breakup of Liquid Ring in the experimentation for stretching and reversing
In border.There are a step, correspondence and the step of the upper end of lower chuck 3 in the bottom seal of sleeve pipe 7, inside, prevents fixture block 3 from falling in sleeve pipe
Portion.There is the platform for stretching out 6mm in the outside of sleeve pipe 7, for erecting the container 6 for containing liquid.In the end of sleeve pipe 7, there is external screw thread,
For being connected with fastening internal thread circle 4, so as to fixed container 6.It is placed with one between fastening internal thread circle 4 and container 6 in addition
Rubber ring 5, it act as preventing the liquid in container 6 from oozing out by junction, erection sequence of the present utility model such as Fig. 3 institutes
Show.After being completed（As shown in Figure 4）, with waterproof flexible glue will fasten internal thread circle 4 be connected with cannula tip where, container 6
Cling with the part between rubber ring 5.So ensure that the liquid in the device will not ooze out.Sleeve pipe 7 act as folder
Hold sample.The lower chuck 3 that will be equipped with sample 2 is put in sleeve pipe 7, in placing into the lower chuck of testing machine, sample is held.Set
Pipe is made using nylon material, and its reason is that, because PC materials are a kind of softer materials, and elastic deformation is not easy greatly very much
Plastic deformation is produced, can be accommodated repeatedly.Therefore can ensure that testing machine through sleeve pipe lower chuck 3 being clamped tightly.Whole dress
Put and ensure that while can clamp sample, sample can be carried out fatigue experiment in liquid environment.
Thermocouple 8 is bound at the middle part of sample 2, for measuring the fluctuation situation of the temperature in whole fatigue experiment of sample 2.Most
The device for assembling is installed on MTS testing machines together with sample 2 afterwards, realize carries out marmem in liquid environment
Fatigue experiment.
Application Example：
This example is single shaft fatigue experiment of the niti-shaped memorial alloy in air and water, first at room temperature by NiTi
Marmem is positioned in air, and it is 6% to have carried out plastic strain amplitude, and loading frequency is respectively 0.025Hz and 0.125Hz two
Plant the single shaft fatigue experiment of frequency.Then laboratory holder of the present utility model is utilized again, and niti-shaped memorial alloy is positioned over
In water, it is 6% to have carried out plastic strain amplitude, and loading frequency is respectively the single shaft fatigue experiment of two kinds of frequencies of 0.025Hz and 0.125Hz.
Experimental result is as shown in Figure 5 and Figure 6.Fig. 5 (a) first gives niti-shaped memorial alloy first under four kinds of operating modes
The load-deformation curve of circle, 5 (b) is the load-deformation curve of fatigue experiment last lap.As seen from the figure in air, nickel
Hardening modulus of the transformation hardening modular ratio of titanium shape memory alloy in water is big.And in air, niti-shaped memorial alloy
Fatigue failure when overstrain higher than overstrain in water.
Fig. 6 is shown under four kinds of operating modes, the evolution curve of front 100 circle niti-shaped memorial alloy temperature.As seen from the figure, it is empty
Temperature amplitude of the niti-shaped memorial alloy in cyclic process is on the whole higher than the temperature amplitude in water in gas.
On fatigue life, in atmosphere frequency is most short for the operating mode material lifetime of 0.125Hz, and water medium frequency is
The operating mode material lifetime of 0.025Hz is most long, and the operating mode that air medium frequency is 0.025Hz and water medium frequency is 0.125Hz, material
Fatigue life between above two operating mode, and be more or less the same.
Can be illustrated by above experimental result, niti-shaped memorial alloy is positioned in liquid medium water and is tested
Can be equivalent to and enter the relatively low operating mode of line frequency in atmosphere, it is possible to solve the problems, such as that the low frequency fatigue test used time is long.
A kind of marmem for providing different liquids environment of the present utility model is shown by the checking of the example
Fatigue test clamper is effective and feasible.
Claims (3)
1. a kind of shape memory alloy material fatigue test ware that liquid mediums environment is provided, it is characterised in that include
Can be used to contain the container of liquid（6）With the sample clamping mechanism for being placed in container center；The sample clamping mechanism is mainly by upper
Chuck（1）, lower chuck（3）And sleeve pipe（7）Composition；Sleeve pipe（7）Lower end be blind mouth, external screw thread is equipped with the outside of upper end on platform
Circle；Sleeve pipe（7）Through container（6）Central through hole, fasten internal thread circle（4）It is enclosed within sleeve pipe（7）External screw thread circle on, realize set
Pipe（7）With container（6）Closed connection；Upper grip（1）And lower chuck（3）Being side has the blind head pipe of opening；Experiment peace
During dress, tested pipe sample upper and lower side inserts respectively upper grip（1）And lower chuck（3）It is interior；Lower chuck（3）Plug-in-sleeve（7）It is interior.
2. the shape memory alloy material fatigue test ware that liquid mediums environment can be provided according to claim 1,
Characterized in that, fastening internal thread circle（4）With container（6）Rubber ring is provided between inner bottom surface（5）.
3. the shape memory alloy material fatigue test ware that liquid mediums environment can be provided according to claim 1,
Characterized in that, the upper grip（1）And lower chuck（3）Internal diameter it is suitable with the external diameter of tested cylinder sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620844930.XU CN206095770U (en) | 2016-08-05 | 2016-08-05 | Can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620844930.XU CN206095770U (en) | 2016-08-05 | 2016-08-05 | Can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment |
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| Publication Number | Publication Date |
|---|---|
| CN206095770U true CN206095770U (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620844930.XU Expired - Fee Related CN206095770U (en) | 2016-08-05 | 2016-08-05 | Can provide experimental ware of shape memory alloy material fatigue of different liquid medium environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092731A (en) * | 2016-08-05 | 2016-11-09 | 西南交通大学 | A kind of shape memory alloy material fatigue test ware that liquid mediums environment is provided |
| CN109696368A (en) * | 2019-01-30 | 2019-04-30 | 济南鑫光试验机制造有限公司 | A kind of three axis fatigue tester of pitch |
-
2016
- 2016-08-05 CN CN201620844930.XU patent/CN206095770U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092731A (en) * | 2016-08-05 | 2016-11-09 | 西南交通大学 | A kind of shape memory alloy material fatigue test ware that liquid mediums environment is provided |
| CN109696368A (en) * | 2019-01-30 | 2019-04-30 | 济南鑫光试验机制造有限公司 | A kind of three axis fatigue tester of pitch |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170412 Termination date: 20210805 |
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| CF01 | Termination of patent right due to non-payment of annual fee |