CN103471922A - Device and method for observing shape memory alloy tension-torsion experiment - Google Patents
Device and method for observing shape memory alloy tension-torsion experiment Download PDFInfo
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- CN103471922A CN103471922A CN2013104622343A CN201310462234A CN103471922A CN 103471922 A CN103471922 A CN 103471922A CN 2013104622343 A CN2013104622343 A CN 2013104622343A CN 201310462234 A CN201310462234 A CN 201310462234A CN 103471922 A CN103471922 A CN 103471922A
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Abstract
The invention discloses a device for observing a shape memory alloy tension-torsion experiment acting below a scanning electron microscope. The device comprises a shape memory alloy tension-torsion experiment clamp and a scanning electron microscope observing system used for observing the change characteristic of the surface microstructure of a test piece in the pseudoelasticity phase change process of the shape memory alloy tension-torsion experiment. The shape memory alloy tension-torsion experiment clamp including a clamp head, a tension and pressing experiment unit and a torsion experiment unit and the scanning electron microscope observing system are adopted to observe the change characteristic of the surface microstructure of the test piece in the pseudoelasticity phase change process of the shape memory alloy tension-torsion experiment. The tension and torsion performance test of shape memory alloy can be simultaneously completed, the test piece is convenient and fast to mount and fix, the clamping connection is stable and reliable, and the tension and torsion performance test of the shape memory alloy with a special function can be completed well. The performance study of the shape memory alloy is facilitated, cost is low, and the device has the advantage of being cheap in implementation.
Description
Technical field
The present invention relates to the tension-torsion technical field of performance test, particularly a kind of marmem tension-torsion experimental observation device and method acted under scanning electron microscope.
Background technology
Marmem is a kind of alloy with SME, belongs to a kind of new function material that integrates perception and drive.(the Shape Memory Alloys of marmem under the heating power load, SMAs) distinctive thermoelastic martensitic transformation is given its unusual characteristic, as SME (Shape Memory Effect, SME) and pseudoelasticity (Pseudoelastisity, PE) etc.These characteristics make marmem be applied widely at industry, national defence, instrument and medical field.All being widely used in fields such as electronics, machinery, aerospace, transportation, building, chemistry, medical treatment, the energy, household electrical appliances and daily living articles of marmem.What generally adopt is all the test specimen of undersized marmem.Particularly, in the application of biomedical aspect, small size is had to more special requirement.For example, the making of orthopaedics inside-fixture, the sawtooth armlet is embraced internal fixation device, locking-type intramedullary nail, patella fixator, centrum nail, Invasive lumbar fusion device etc.Mainly for the manufacture of the NiTiSMAs microtubule of blood vessel support and Minimally Invasive Surgery apparatus, be also the small-size test piece of use in addition, and need a person with the qualifications of a general the material external diameter be controlled in the range of size of human vas internal diameter, could carry out corresponding function.
In order to be familiar with better the characteristic of marmem, to tension-torsion performance and the shape restorability research experiment of marmem, significant.
In prior art, the equipment for detection of various metal tension-torsion performances of existence, majority is for common metal, the test test specimen is not had to specific (special) requirements, therefore, for the ease of the installation of test test specimen, the size of its test specimen and fixture all arranges greatlyr, the most forms that adopt flange plate structure of fixture.The MTS(material testingSYSTEM material testing system of producing such as American MTS systems Corporation company) operating system (product type MTS858/material testing system858/MTS858 universal testing machine) just belongs to this equipment.But for marmem because the more expensive and self performance of cost is special, so need to make the test specimen that becomes reduced size (general test section adopts the round tube shape of diameter 5mm left and right), then be combined with temperature controlled measure, could detect exactly its tension-torsion performance like this, and the function of recovering under high temperature.The equipment that also exists some can detect small-size test piece tension-torsion performance in prior art, but all have defect with high costs, and same and be not suitable for having the tension-torsion performance test of the marmem of specific function.
Therefore be badly in need of a kind of tension-torsion performance testing device and method that is suitable for having the marmem of specific function.
Summary of the invention
In view of this, technical matters to be solved by this invention is to provide a kind of tension-torsion performance testing device and method that is suitable for having the marmem of specific function.
One of purpose of the present invention is to propose a kind of marmem tension-torsion experimental observation device; Two of purpose of the present invention is to propose a kind of marmem tension-torsion experimental observation method.
One of purpose of the present invention is achieved through the following technical solutions:
Marmem tension-torsion experimental observation device provided by the invention, comprise marmem tension-torsion laboratory holder, described marmem tension-torsion laboratory holder comprises base plate, test specimen chuck, tension and compression experiment unit and torsion test unit, and described test specimen chuck, tension and compression experiment unit and torsion test unit are arranged on base plate;
Described tension and compression experiment unit comprises tension and compression location case, tension and compression load sensor, tension and compression screw mandrel and tension and compression nut;
Described test specimen chuck comprises movable end chuck, stiff end chuck;
Described torsion test unit comprises reversing locates case, torsion load sensor, torsion screw mandrel, torque nut, torsion driving rack and reverses gear;
Described tension and compression nut is arranged on the case of tension and compression location, described tension and compression nut is connected with an end of tension and compression load sensor by the tension and compression screw mandrel, described tension and compression screw mandrel is for being converted into rotatablely moving of tension and compression nut the rectilinear motion of tension and compression screw mandrel, the stiff end chuck of described test specimen chuck is connected with the tension and compression load sensor other end, between the movable end chuck of described test specimen chuck and stiff end chuck for fixing test specimen;
Described torque nut is arranged to be reversed on the case of location, described torque nut is connected with an end that reverses load sensor by reversing screw mandrel, described torsion screw mandrel is for being converted into rotatablely moving of torque nut the rectilinear motion that reverses screw mandrel, the described torsion load sensor other end is connected with the torsion driving rack, in described movable end chuck, the torsion gear is set, described torsion gear is connected with test specimen to be measured, and described torsion gear is connected with a joggle with the torsion driving rack.
Further, described tension-compression sensor is connected with the stiff end chuck of test specimen chuck by universal joint.
Further, described stiff end chuck is symmetrically arranged with at least two puller bolts, and described puller bolt is by the fixing test specimen of threads turn.
Further, on described tension and compression load sensor and torsion load sensor, be provided with output lead, described output lead is connected with strainmeter.
Further, also comprise scanning electron microscope, described scanning electron microscope also stores and image is carried out to Treatment Analysis for the image of automatic acquisition test specimen generation deformation, described marmem tension-torsion laboratory holder lies against on the worktable in the scanning electron microscope working bin, then scanning electron microscope is finely tuned to the marmem observation position in marmem tension-torsion laboratory holder.
Further, also comprise the clock gauge holder, described clock gauge holder is arranged on base plate with respect to the direction of reversing the driving rack place, and described clock gauge holder is used for the axial displacement that fixedly clock gauge is directly measured test specimen.
Further, described test specimen is NiTi SMAs microtubule test specimen.
Two of purpose of the present invention is achieved through the following technical solutions:
Marmem tension-torsion experimental observation method provided by the invention comprises the following steps:
S1: marmem tension-torsion laboratory holder is set and obtains the original length l of test specimen;
S2: tension and compression load sensor and torsion load sensor are demarcated with strainmeter;
S3: determine microstrain and the tension and compression load sensor that strainmeter shows and reverse the stressed corresponding relation of load sensor;
S4: carry out tension test, by rotation tension and compression nut, test specimen is applied to tensile force, measure the microstrain of test specimen by the tension and compression load sensor and count Δ l;
S5: carry out twisting test, by the rotation torque nut, test specimen is applied to twisting resistance, by reversing the load sensor test, act on the suffered shear stress of test specimen;
S6: marmem tension-torsion laboratory holder is sent into to the work chamber of scanning electron microscope and by scanning electron microscope observation and record the test specimen test data.
Further, further comprising the steps of:
S41: in tension test, by following formula, calculate the stretching apparent strain:
S51: in rotation test, by following formula, calculate the torsion apparent strain:
In formula, F is the suffered shearing of test specimen that strainmeter is read, the radius that R is gear, the mean radius that r is thin cylinder, the wall thickness that t is cylinder; τ is for acting on the suffered shear stress of test specimen,
In formula, the mean radius that r is thin cylinder, the relative torsional angle that φ is the cylinder two ends, the girth that the φ value cogs by the screw mandrel Displacement Ratio be connected with tooth bar draws, and the displacement of described screw mandrel is directly read by clock gauge, and γ is for reversing apparent strain.
Further, described test specimen is NiTi SMAs microtubule test specimen.
The invention has the advantages that: the present invention adopts the marmem tension-torsion laboratory holder comprise test specimen chuck, tension and compression experiment unit and torsion test unit, and scanning electron microscope observation system test specimen surface micro-structure variation characteristic in the pseudoelasticity phase transition process while observing the experiment of marmem tension-torsion.Can complete stretching and the twisting property test of marmem, and test specimen is installed and convenient fixing is quick, is clamped and connected reliable and stable, can complete well the marmem tension-torsion performance test of specific function simultaneously.Be conducive to the performance study of marmem, cost is low, has advantages of that enforcement is cheap.
The accompanying drawing explanation
In order to make the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
The marmem tension-torsion experimental observation structure drawing of device that Fig. 1 provides for the embodiment of the present invention;
The marmem tension-torsion experimental observation method flow diagram that Fig. 2 provides for the embodiment of the present invention;
The vertical schematic diagram of the profile that Fig. 3 is test specimen and size;
The horizontal schematic diagram of the profile that Fig. 4 is test specimen and size.
In figure, base plate 1, tension and compression location case 2, tension and compression load sensor 3, tension and compression screw mandrel 4, tension and compression nut 5, movable end chuck 6, stiff end chuck 7, torsion are located case 8, torsion load sensor 9, torsion screw mandrel 10, torque nut 11, are reversed driving rack 12, torsion gear 13, clock gauge holder 14.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment is only for the present invention is described, rather than in order to limit the scope of the invention.
The marmem tension-torsion experimental observation structure drawing of device that Fig. 1 provides for the embodiment of the present invention, the marmem tension-torsion experimental observation method flow diagram that Fig. 2 provides for the embodiment of the present invention, the vertical schematic diagram of the profile that Fig. 3 is test specimen and size, the horizontal schematic diagram of the profile that Fig. 4 is test specimen and size, as shown in the figure: the invention provides device and arrange for adopting non-standard small-size test piece, this test specimen is NiTiSMAs microtubule test specimen, the phase transition temperature of material utilizes derivatograph (DSC200-PC) to determine, its austenite changes end temp, austenite changes and starts temperature, Ms (martensite start) point, the martensite transfor mation end temp is respectively: A
f=-0.5 ℃, A
s=-23 ℃, M
s=-49 ℃, M
f=-76 ℃, can find out that from four phase transition temperatures at room temperature this material is in austenitic state, its pseudoelasticity mechanical behavior is guaranteed.As shown in Figure 3, wherein, L0 means that the length of test specimen is 40mm to the physical dimension of test specimen, and L1 means that test specimen adds and hold long 12mm, and D0 means external diameter 1.7mm, and d means internal diameter 1.4mm.
Marmem tension-torsion experimental observation device provided by the invention, comprise marmem tension-torsion laboratory holder, described marmem tension-torsion laboratory holder comprises base plate 1, test specimen chuck, tension and compression experiment unit and torsion test unit, and described test specimen chuck, tension and compression experiment unit and torsion test unit are arranged on base plate 1;
Described tension and compression experiment unit comprises tension and compression location case 2, tension and compression load sensor 3, tension and compression screw mandrel 4 and tension and compression nut 5;
Described test specimen chuck comprises movable end chuck 6 and stiff end chuck 7;
Described torsion test unit comprises reversing to be located case 8, torsion load sensor 9, reverse screw mandrel 10, torque nut 11, reverses driving rack 12 and reverses gear 13;
Described tension and compression nut 5 is arranged on the case 2 of tension and compression location, described tension and compression nut 5 is connected with an end of tension and compression load sensor 3 by tension and compression screw mandrel 4, described tension and compression screw mandrel 4 is for being converted into rotatablely moving of tension and compression nut 5 rectilinear motion of tension and compression screw mandrel 4, the stiff end chuck 7 of described test specimen chuck is connected with tension and compression load sensor 3 other ends, between the movable end chuck 6 of described test specimen chuck and stiff end chuck 7 for fixing test specimen;
Described torque nut 11 is arranged to be reversed on the case 8 of location, described torque nut 11 is connected with an end that reverses load sensor 9 by reversing screw mandrel 10, described torsion screw mandrel 10 is for being converted into rotatablely moving of torque nut 11 rectilinear motion that reverses screw mandrel 10, described torsion load sensor 9 other ends are connected with torsion driving rack 12, the interior setting of described movable end chuck 6 reversed gear 13, described torsion gear 13 is connected with test specimen to be measured, and described torsion gear 13 is connected with a joggle with torsion driving rack 12.
Described tension-compression sensor is connected with the stiff end chuck of test specimen chuck by universal joint.
Described stiff end chuck is symmetrically arranged with at least two puller bolts, and described puller bolt is by the fixing test specimen of threads turn.
Be provided with output lead on described tension and compression load sensor and torsion load sensor, described output lead is connected with strainmeter.
Also comprise scanning electron microscope, described scanning electron microscope also stores and image is carried out to Treatment Analysis for the image of automatic acquisition test specimen generation deformation, described marmem tension-torsion laboratory holder lies against on the worktable in the scanning electron microscope working bin, then scanning electron microscope is finely tuned to the marmem observation position in marmem tension-torsion laboratory holder.
Also comprise clock gauge holder 14, described clock gauge holder 14 is arranged on base plate with respect to the direction of reversing driving rack 12 places, and described clock gauge holder 14 is for axial displacement that fixedly clock gauge is directly measured test specimen.
The embodiment of the present invention provides a kind of marmem tension-torsion experimental observation method, comprises the following steps:
S1: marmem tension-torsion laboratory holder is set and obtains the original length l of test specimen;
S2: tension and compression load sensor and torsion load sensor are demarcated with strainmeter;
S3: determine microstrain and the tension and compression load sensor that strainmeter shows and reverse the stressed corresponding relation of load sensor;
S4: the axial displacement of directly measuring test specimen by clock gauge;
S5: carry out tension test, the suffered pulling force of tension and compression load sensor acts on the microstrain that the pulling force of test specimen read by strainmeter and counts Δ l, and then the original length divided by test specimen obtains the apparent strain that stretches:
S6: the rotation torque nut applies twisting resistance to test specimen, by reversing the load sensor test, acts on the suffered shear stress of test specimen, and computing formula is:
In formula, F is the suffered shearing of test specimen that strainmeter is read, the radius that R is gear, the mean radius that r is thin cylinder, the wall thickness that t is cylinder;
Reversing apparent strain adopts following steps to obtain:
Reverse and load, the shearing strain while reversing according to thin cylinder is calculated formula and is:
In formula, the mean radius that r is thin cylinder, the relative torsional angle that φ is the cylinder two ends, the girth that the φ value cogs by the screw mandrel Displacement Ratio be connected with tooth bar draws, the displacement of described screw mandrel is directly read by clock gauge;
S7: marmem tension-torsion laboratory holder is sent into to the work chamber of scanning electron microscope and by scanning electron microscope observation and record the test specimen test data.
The marmem tension-torsion experimental observation device that the present embodiment provides is to carry out stretching experiment and torsion test simultaneously, is conducive to improve the efficiency of the performance study of marmem, and have enforcement cheaply, advantage easily.
The scanning electron microscope that the present embodiment adopts adopts normal business equipment as recording geometry, is scanning electron microscope SEMJSM-6460LV, and its working bin is of a size of 240*240*70mm; For the cooperating storehouse, image that can automatic acquisition test specimen generation deformation also stores, with and these images are carried out to Treatment Analysis etc., to realize the process such as robotization processing.It is 230*230*60mm that the base plate of the marmem tension-torsion laboratory holder that the present embodiment provides adopts the wide * of long * high, during observation, marmem tension-torsion experimental provision is lain against on the worktable in the scanning electron microscope working bin, then scanning electron microscope is finely tuned to the marmem observation position.
The tension and compression load sensor that the present embodiment provides is the GBLGM-4 high-precision load sensor, and maximal tensility is 3mm, and maximum range is 500N; Reversing load sensor is the GBLGM-4 high-precision load sensor, maximum range is 50N, the peak torque that can apply is ± 500N.mm that the scope of the torsion angle of design is ± 30 ° (or 0～60 °), the maximum shear strain max=0.053 that equipment can apply; The overall diameter of gear is 20mm.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. marmem tension-torsion experimental observation device, it is characterized in that: comprise marmem tension-torsion laboratory holder, described marmem tension-torsion laboratory holder comprises base plate, test specimen chuck, tension and compression experiment unit and torsion test unit, and described test specimen chuck, tension and compression experiment unit and torsion test unit are arranged on base plate; Described tension and compression experiment unit comprises tension and compression location case, tension and compression load sensor, tension and compression screw mandrel and tension and compression nut; Described test specimen chuck comprises movable end chuck, stiff end chuck; Described torsion test unit comprises reversing locates case, torsion load sensor, torsion screw mandrel, torque nut, torsion driving rack and reverses gear; Described tension and compression nut is arranged on the case of tension and compression location, described tension and compression nut is connected with an end of tension and compression load sensor by the tension and compression screw mandrel, described tension and compression screw mandrel is for being converted into rotatablely moving of tension and compression nut the rectilinear motion of tension and compression screw mandrel, the stiff end chuck of described test specimen chuck is connected with the tension and compression load sensor other end, between the movable end chuck of described test specimen chuck and stiff end chuck for fixing test specimen; Described torque nut is arranged to be reversed on the case of location, described torque nut is connected with an end that reverses load sensor by reversing screw mandrel, described torsion screw mandrel is for being converted into rotatablely moving of torque nut the rectilinear motion that reverses screw mandrel, the described torsion load sensor other end is connected with the torsion driving rack, in described movable end chuck, the torsion gear is set, described torsion gear is connected with test specimen to be measured, and described torsion gear is connected with a joggle with the torsion driving rack.
2. marmem tension-torsion experimental observation device according to claim 1, it is characterized in that: described tension-compression sensor is connected with the stiff end chuck of test specimen chuck by universal joint.
3. marmem tension-torsion experimental observation device according to claim 1, it is characterized in that: described stiff end chuck is symmetrically arranged with at least two puller bolts, and described puller bolt is by the fixing test specimen of threads turn.
4. marmem tension-torsion experimental observation device according to claim 1 is characterized in that: described tension and compression load sensor and reverse on load sensor and be provided with output lead, described output lead is connected with strainmeter.
5. marmem tension-torsion experimental observation device according to claim 1, it is characterized in that: also comprise scanning electron microscope, described scanning electron microscope also stores and image is carried out to Treatment Analysis for the image of automatic acquisition test specimen generation deformation, described marmem tension-torsion laboratory holder lies against on the worktable in the scanning electron microscope working bin, then scanning electron microscope is finely tuned to the marmem observation position in marmem tension-torsion laboratory holder.
6. marmem tension-torsion experimental observation device according to claim 1, it is characterized in that: also comprise the clock gauge holder, described clock gauge holder is arranged on base plate with respect to the direction of reversing the driving rack place, and described clock gauge holder is used for the axial displacement that fixedly clock gauge is directly measured test specimen.
7. marmem tension-torsion experimental observation device according to claim 1, it is characterized in that: described test specimen is NiTi SMAs microtubule test specimen.
8. utilize the observation procedure of the described marmem tension-torsion of claim 1-7 any one experimental observation device, it is characterized in that: comprise the following steps:
S1: marmem tension-torsion laboratory holder is set and obtains the original length l of test specimen;
S2: tension and compression load sensor and torsion load sensor are demarcated with strainmeter;
S3: determine microstrain and the tension and compression load sensor that strainmeter shows and reverse the stressed corresponding relation of load sensor;
S4: carry out tension test, by rotation tension and compression nut, test specimen is applied to tensile force, measure the microstrain of test specimen by the tension and compression load sensor and count Δ l;
S5: carry out twisting test, by the rotation torque nut, test specimen is applied to twisting resistance, by reversing the load sensor test, act on the suffered shear stress of test specimen;
S6: marmem tension-torsion laboratory holder is sent into to the work chamber of scanning electron microscope and by scanning electron microscope observation and record the test specimen test data.
9. marmem tension-torsion experimental observation method according to claim 8 is characterized in that: further comprising the steps of:
S41: in tension test, by following formula, calculate the stretching apparent strain:
S51: in rotation test, by following formula, calculate the torsion apparent strain:
In formula, F is the suffered shearing of test specimen that strainmeter is read, the radius that R is gear, the mean radius that r is thin cylinder, the wall thickness that t is cylinder; τ is for acting on the suffered shear stress of test specimen,
In formula, the mean radius that r is thin cylinder, the relative torsional angle that φ is the cylinder two ends, the girth that the φ value cogs by the screw mandrel Displacement Ratio be connected with tooth bar draws, and the displacement of described screw mandrel is directly read by clock gauge, and γ is for reversing apparent strain.
10. marmem tension-torsion experimental observation method according to claim 8, it is characterized in that: described test specimen is NiTiSMAs microtubule test specimen.
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| CN105486594A (en) * | 2015-12-08 | 2016-04-13 | 王友善 | Rubber material tension-torsional fatigue combined testing machine |
| CN106018099A (en) * | 2016-06-22 | 2016-10-12 | 国网河南省电力公司电力科学研究院 | System and method for detecting crimping quality of end fitting of composite insulator |
| CN106442583A (en) * | 2016-09-06 | 2017-02-22 | 南京林业大学 | Two-dimensional shape memory effect evaluation method of concrete pavement calking material |
| CN106623756A (en) * | 2016-12-04 | 2017-05-10 | 重庆市环岛机械制造有限公司 | Automobile antiskid chain manual type chain twisting machine |
| CN108088746A (en) * | 2017-12-19 | 2018-05-29 | 江苏师范大学 | A kind of metal tension and torsion deformation mechanics and characteristics of Acoustic Emission test and analysis method |
| CN108195672A (en) * | 2017-12-19 | 2018-06-22 | 江苏师范大学 | A kind of material tension-torsion bursting stress and the Forecasting Methodology in failure mechanics direction |
| CN109916367A (en) * | 2019-04-01 | 2019-06-21 | 中国船舶重工集团公司第七一九研究所 | A kind of buoyant raft deformation measuring device and measurement method |
| CN110274817A (en) * | 2019-05-21 | 2019-09-24 | 大连理工大学 | A kind of new test loading device based on lever principle method |
| CN112816326A (en) * | 2021-01-25 | 2021-05-18 | 济南恒瑞金试验机有限公司 | Tool for testing biomechanical property of interbody fusion cage, testing machine and testing method |
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| CN105486594A (en) * | 2015-12-08 | 2016-04-13 | 王友善 | Rubber material tension-torsional fatigue combined testing machine |
| CN106018099A (en) * | 2016-06-22 | 2016-10-12 | 国网河南省电力公司电力科学研究院 | System and method for detecting crimping quality of end fitting of composite insulator |
| CN106018099B (en) * | 2016-06-22 | 2019-07-12 | 国网河南省电力公司电力科学研究院 | A method of for detecting end part of composite insulator fitting crimp quality |
| CN106442583A (en) * | 2016-09-06 | 2017-02-22 | 南京林业大学 | Two-dimensional shape memory effect evaluation method of concrete pavement calking material |
| CN106623756B (en) * | 2016-12-04 | 2018-10-30 | 重庆市环岛机械制造有限公司 | Automobile anti-skid chain hand twisted chain machine |
| CN106623756A (en) * | 2016-12-04 | 2017-05-10 | 重庆市环岛机械制造有限公司 | Automobile antiskid chain manual type chain twisting machine |
| CN108195672A (en) * | 2017-12-19 | 2018-06-22 | 江苏师范大学 | A kind of material tension-torsion bursting stress and the Forecasting Methodology in failure mechanics direction |
| CN108088746A (en) * | 2017-12-19 | 2018-05-29 | 江苏师范大学 | A kind of metal tension and torsion deformation mechanics and characteristics of Acoustic Emission test and analysis method |
| CN109916367A (en) * | 2019-04-01 | 2019-06-21 | 中国船舶重工集团公司第七一九研究所 | A kind of buoyant raft deformation measuring device and measurement method |
| CN109916367B (en) * | 2019-04-01 | 2024-02-20 | 中国船舶重工集团公司第七一九研究所 | Floating raft deformation measuring device and measuring method |
| CN110274817A (en) * | 2019-05-21 | 2019-09-24 | 大连理工大学 | A kind of new test loading device based on lever principle method |
| CN110274817B (en) * | 2019-05-21 | 2020-07-24 | 大连理工大学 | Test loading device based on lever principle method |
| CN112816326A (en) * | 2021-01-25 | 2021-05-18 | 济南恒瑞金试验机有限公司 | Tool for testing biomechanical property of interbody fusion cage, testing machine and testing method |
| CN114838770A (en) * | 2022-05-16 | 2022-08-02 | 福州大学 | Shape memory alloy torsional spring mechanical property testing device |
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