CN111537342B - External degradation loading experimental apparatus of degradable metal - Google Patents
External degradation loading experimental apparatus of degradable metal Download PDFInfo
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- CN111537342B CN111537342B CN202010377553.4A CN202010377553A CN111537342B CN 111537342 B CN111537342 B CN 111537342B CN 202010377553 A CN202010377553 A CN 202010377553A CN 111537342 B CN111537342 B CN 111537342B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses an in-vitro degradation loading experimental device for degradable metals, which comprises a liquid storage tank (1), a water bath tank (2), a double-layer support frame (3) and a loading device (4); the loading device (4) comprises a degradable metal rod sample (5), a piezoresistive film pressure sensor (6), a movable clamping device (7), a data acquisition unit (8), a computer (9), a telescopic rod (10) and a motor (11); the experimental device has simple structure, low cost and convenient operation, can provide loads in different forms, brings great convenience for the degradation performance detection of the degradable metal implantation instrument, and provides scientific theoretical guidance for the subsequent optimization design of the degradable metal implantation instrument.
Description
Technical Field
The invention relates to an in-vitro degradation loading experimental device for degradable metals, and belongs to the technical field of material protection devices.
Background
At present, some in-vitro degradation test platforms related to degradable metals are available, which not only can provide a liquid environment similar to human body fluid, but also can simulate the stress of a magnesium alloy implantation instrument in different forms in the in-service process of a human body. However, the existing in vitro degradation test platform for degradable metals still has some defects, such as: in the experimental process, when the degradable metal sample simulating bone tissue is stressed in the radial direction, the clamping device cannot be locked with the clamping device, so that the magnesium alloy sample is easy to fall off when the applied tensile load is increased, if a dynamic tension-compression alternative load is applied, the degradable metal rod sample is broken when the load frequency is high, and due to the fact that no protection device is arranged, the no-load phenomenon exists, and the test platform is seriously damaged; in addition, most of the existing loading systems are in a pneumatic or hydraulic mode, and in the experimental process, when a dynamic load with a certain frequency is applied to the degradable metal bar sample through a time relay, the problem of load lag actually loaded on the degradable metal bar sample exists, namely the frequency of the actually loaded dynamic load is not consistent with the preset frequency. The existence of the problems brings deviation to the in-vitro degradation experimental result of the degradable metal implant device simulating the physiological stress environment. Therefore, the good clamping device, the accurate loading device without delay and the self-protection cutting-off system are important indexes for evaluating the structural design of the loading device for the degradation of the degradable metal in vitro.
Aiming at the experimental research of key indexes of the degradation performance of the degradable metal implantation instrument, a set of simple, applicable and effective loading experimental device for simulating a physiological stress environment is needed, the device can simulate the physiological stress environment of a human body to accurately apply stress of different forms to the degradable metal implantation instrument without delay, and scientific theoretical basis is provided for establishing and perfecting the detection of the degradation performance of the degradable metal implantation instrument and the optimization design of the implantation instrument.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a loading experimental device for in-vitro degradation of degradable metal, which can truly simulate the service behavior of a degradable metal implantation instrument in human body fluid, can accurately apply loads of different forms to the degradable metal implantation instrument without delay, simultaneously avoids the problems that a degradable metal sample falls off and a sample fracture device cannot be self-protected in the experimental process, has controllable load form and size, experimental temperature and corrosion medium, and is suitable for degradable metal implantation instrument test pieces of different materials and sizes.
The technical scheme is as follows: the invention relates to an in-vitro degradable loading device for degradable metals, which comprises a liquid storage tank, a water bath tank, a double-layer support frame and a loading device; wherein: the external degradation loading device of degradable metal include degradable metal bar sample, piezoresistive film pressure sensor, movable clamping device, data collection station, computer, telescopic link and motor, wherein: the piezoresistive film pressure sensor is respectively installed between movable clamping devices on the upper portion and the lower portion, the degradable metal rod sample is fixed by the movable clamping devices on the upper portion and the lower portion, the movable clamping device on the upper portion is fixed at the bottom of the telescopic rod, the piezoresistive film pressure sensor is connected with the data acquisition unit, the data acquisition unit acquires signals and sends the signals to the computer, a power engine motor in the loading device is arranged on the upper portion of the double-layer supporting frame, a water bath box is arranged in the double-layer supporting frame, a liquid storage tank is arranged in the water bath box, the degradable metal rod sample is placed in the liquid storage tank in the vertical direction, the upper portion of the degradable metal rod sample is connected with the bottom of the telescopic rod through a movable chuck, and the telescopic rod is connected with the motor.
The diameter of the degradable metal rod sample is 1-5 mm.
The thickness of the piezoresistive thin-film pressure sensor is 0.05-0.5 mm, the sensing area of the piezoresistive thin-film pressure sensor covers the upper surface and the lower surface of the degradable metal rod sample, and the density of the sensing points is 1-250 measuring points/cm2The load detection range of the telescopic rod transmission is 0.01 MPa-150 MPa.
The aperture of the closed movable clamping device is 2-8 mm.
The degradable metal bar sample, the film resistance type pressure sensor and the movable clamping device are closely contacted, and the degradable metal bar sample is attached without relative sliding, so that the degradable metal bar sample cannot fall off in the loading process.
The degradable metal bar sample contacts sensing points on the piezoresistive film pressure sensor along the cross section direction, radial force applied to the degradable metal bar sample through a telescopic rod driven by a motor is uniformly distributed, loads of different forms and sizes driven by the motor and acting on the end part of each sensing point are collected through the sensor, when the degradable metal bar sample is broken, data collected by a data collector from the piezoresistive film pressure sensor is suddenly changed, and a self-protection system of the system can cut off a power supply to prevent no-load.
The type of the corrosive medium in the liquid storage tank is adjustable, and the temperature of the corrosive medium in the liquid storage tank is adjusted through the water bath tank.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects:
1) the actual situation of the degradable metal implantation apparatus in human body fluid is simulated in a real way; different from a common physiological stress environment simulation loading device, the measured data of the invention is the radial load action uniformly distributed along the radial cross section of the degradable metal sample, and the stress condition of the degradable metal implantation instrument in the body fluid of the human body is reflected more truly; the corrosive medium environment generated by the whole device can truly simulate the human body fluid environment, and the corrosive medium components and the temperature are controllable.
2) The device can timely and accurately provide and monitor loads of different forms and sizes on the degradable metal sample, compared with the existing loading device for simulating the physiological stress environment, the electric power system of the device can avoid the problem of load lag in the dynamic tension-compression alternative load experiment process of the degradable metal implantation instrument test piece under pneumatic and hydraulic power systems, the novel movable chuck and the automatic power-off system for the fracture of the degradable metal test piece can avoid the problems of the falling of the degradable metal test piece and the incapability of self-protection of fracture in the experiment process, meanwhile, the sensing point density of the pressure sensor is high, the bearing data of the degradable metal test piece can be accurately obtained, a dynamic contact force distribution cloud picture is obtained through software, the size and the form change of the actual bearing load of the degradable metal implantation device in a corrosive medium can be evaluated more intuitively and scientifically.
3) The experimental device is simple, low in cost and wide in application range, can perform degradation experiment of in-vitro human body physiological stress environment on degradable metal implantation instruments of different sizes and materials, and has universal applicability, and the experimental temperature and the corrosive medium can be adjusted.
Drawings
FIG. 1 is a schematic view of a degradable metal in-vitro degradation loading device;
FIG. 2 is a schematic view of a loading device;
the figure shows that: the device comprises a liquid storage tank 1, a water bath tank 2, a double-layer support frame 3, a loading device 4, a degradable metal sample 5, a piezoresistive film pressure sensor 6, a movable clamping device 7, a data acquisition unit 8, a computer 9, a telescopic rod 10 and a motor 11.
Detailed Description
The invention provides an in-vitro degradation loading experimental device for degradable metals, which is suitable for researching and measuring the change rule of the degradation performance of degradable metal implantation instruments under the action of different loads and forms in a corrosive medium.
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, an in vitro degradation loading experimental device for degradable metals comprises a liquid storage tank 1, a water bath tank 2, a double-layer support frame 3 and a loading device 4;
the power engine motor 11 in the loading device 4 is arranged on the upper layer of the double-layer support frame 3, the degradable metal sample 5 penetrates through the liquid storage tank 2 in the vertical direction and is connected with the bottom of the telescopic rod 11 through the upper part of the movable chuck 7 of the loading device 4, the telescopic rod 11 is connected with the motor 10, the liquid storage tank 2 is arranged in the water bath tank 3 and is integrally arranged on the lower layer of the double-layer support frame 3;
the liquid storage tank 1 stores a corrosion medium, the corrosion medium in the experimental device can be replaced, and the water bath tank 2 adjusts the temperature of the corrosion medium in the experimental device; the double-layer bracket 3 provides supporting and fixing functions, and the loading device 4 is used for providing loads with different sizes and forms for in-vitro degradation experiments of the degradable metal implant apparatus. As shown in fig. 2, the loading device 4 includes a degradable metal sample 5, a piezoresistive thin film pressure sensor 6, a movable clamping device 7, a data collector 8, a computer 9, a telescopic rod 10 and a motor 11, wherein the piezoresistive thin film pressure sensor 6 is respectively installed inside the upper and lower movable clamping devices 7, the degradable metal sample 5 is fixed by the upper and lower movable clamping devices 7, the upper movable clamping device is fixed at the bottom of the telescopic rod 10, the telescopic rod 10 is connected with the motor 11, and the data collector 8 is connected with the piezoresistive thin film pressure sensor 6 and is connected with the computer 9. The contact force data of the degradable metal sample and the telescopic rod can be displayed in real time through corresponding software, a force distribution cloud chart is obtained, and data analysis is carried out.
The contact surfaces among the degradable metal rod sample 5, the film resistance type pressure sensor 6 and the movable clamping device 10 are smooth and flat, are tightly combined and do not slide relatively.
The diameter of the degradable metal rod sample 5 is 1-5 mm, the aperture of the movable clamping device 7 after closing is 2-8 mm, the thickness of the piezoresistive thin film pressure sensor 6 is 0.05-0.5 mm, the sensing area of the piezoresistive thin film pressure sensor covers the upper surface and the lower surface of the magnesium alloy rod sample 5, and the density of sensing points is 1-250 measuring points/cm2The load detection range for the telescopic rod 10 transmission is 0.01 MPa-150 MPa.
The degradable metal bar sample 5 contacts sensing points on the piezoresistive film pressure sensor along the cross section direction, radial force applied to the degradable metal bar sample 5 is uniformly distributed, and force values acting on the end portions of the sensing points are collected through the sensors.
The type of the corrosion medium is adjustable, the load form and the size loaded on the degradable metal rod sample 5 can be adjusted through the loading device 4, and the temperature of the corrosion medium can be adjusted through the water bath box 2.
Example 1
As shown in the figure 2, an extruded rod-shaped AZ31B magnesium alloy rod sample 5 is selected, an AZ31B magnesium alloy rod sample is loaded on a movable clamping device 7 and is connected to a motor 11 through a telescopic rod 10, positive and negative currents are periodically loaded by the motor 11 to control the load form and the load size of the AZ31 magnesium alloy rod sample 5, a corrosion medium is adopted as a simulated body fluid, the temperature is 37 ℃, the temperature of the corrosion medium is controlled through a water bath box 2, the AZ31B magnesium alloy rod sample 5 shows different degradation performances along with the change of the load form size in the corrosion medium, a data acquisition unit 8 can record the stress form and the stress size actually borne by the AZ31B magnesium alloy rod 5 in real time, and a scientific basis is provided for research on the influence of loads of different sizes and forms on the degradation rule of the degradable AZ31B magnesium alloy rod sample 5.
Example 2
The device is the same as the embodiment 1, the selected test piece is a WE43 magnesium alloy rod test piece, the WE43 magnesium alloy rod test piece is preloaded on the movable clamping device 7 and connected to the motor through the telescopic rod 10, the adopted corrosion medium is simulated body fluid, the temperature is 37 ℃, the temperature of the corrosion medium is controlled through the water bath box 2, in the corrosion medium, the WE43 magnesium alloy rod test piece 5 shows different degradation performances along with the change of the loading form size, the data acquisition unit 8 can record the stress form and the size actually borne by the WE43 magnesium alloy rod 5 in real time, and scientific basis is provided for the research on the influence of loads of different sizes and forms on the degradation rule of the degradable WE43 magnesium alloy rod test piece 5.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention has been described in detail through the above embodiments, and it is obvious that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides an external degradation loading experimental apparatus of degradable metal which characterized in that: the loading device comprises a liquid storage tank (1), a water bath tank (2), a double-layer support frame (3) and a loading device (4); wherein: the in-vitro degradation loading device (4) of the degradable metal comprises a degradable metal rod sample (5), a piezoresistive film pressure sensor (6), a movable clamping device (7), a data acquisition unit (8), a computer (9), a telescopic rod (10) and a motor (11), wherein: the piezoresistive film pressure sensor (6) is respectively installed between movable clamping devices (7) on the upper portion and the lower portion, the degradable metal rod sample (5) is fixed by the movable clamping devices (7) on the upper portion and the lower portion, the movable clamping device (7) on the upper portion is fixed at the bottom of the telescopic rod (10), the piezoresistive film pressure sensor (6) is connected with a data collector (8), the data collector (8) collects signals and sends the signals to a computer (9), a power engine motor (11) in the loading device (4) is arranged on the upper portion of the double-layer supporting frame (3), a water bath box (2) is arranged in the double-layer supporting frame (3), a liquid storage tank (1) is arranged in the water bath box (2), the degradable metal rod sample (5) is placed in the liquid storage tank (1) in the vertical direction, the upper portion of the degradable metal rod sample (5) is connected with the bottom of the telescopic rod (10) through the movable clamping devices (7), the telescopic rod (10) is connected with the motor (11).
2. The in vitro degradation loading experimental device of the degradable metal of claim 1, wherein: the diameter of the degradable metal rod sample (5) is 1 mm-5 mm.
3. The in vitro degradation loading experiment device of degradable metal of claim 1,the method is characterized in that: the thickness of the piezoresistive film pressure sensor (6) is 0.05-0.5 mm, the sensing area of the piezoresistive film pressure sensor covers the upper surface and the lower surface of the degradable metal rod sample (5), and the density of sensing points is 1-250 measuring points/cm2The load detection range of the telescopic rod (10) is 0.01 MPa-150 MPa.
4. The in vitro degradation loading experimental device of the degradable metal of claim 1, wherein: the aperture of the closed movable clamping device (7) is 2-8 mm.
5. The in vitro degradation loading experimental device of the degradable metal of claim 1, wherein: the degradable metal rod sample (5), the piezoresistive thin-film pressure sensor (6) and the movable clamping device (7) are closely contacted, and the degradable metal rod sample (5) is attached without relative sliding and can not fall off in the loading process.
6. The in vitro degradation loading experimental device of the degradable metal of claim 1, wherein: the degradable metal bar sample (5) is in contact with sensing points on the piezoresistive film pressure sensor (6) along the cross section direction, the radial force applied to the degradable metal bar sample (5) through a telescopic rod (10) driven by a motor (11) is uniformly distributed, loads of different forms and sizes, which are driven by the motor (11), acting on the end part of each sensing point are collected through the sensor, when the degradable metal bar sample (5) is broken, the data collected by a data collector (8) from the piezoresistive film pressure sensor (6) is subjected to sudden change, and a self-protection system of the system can be cut off to prevent no-load.
7. The in vitro degradation loading experiment device of the degradable metal as claimed in claim 1, wherein the type of the corrosive medium in the reservoir (1) is adjustable, and the temperature of the corrosive medium in the reservoir (1) is adjusted by the water bath (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010377553.4A CN111537342B (en) | 2020-05-07 | 2020-05-07 | External degradation loading experimental apparatus of degradable metal |
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| CN202010377553.4A CN111537342B (en) | 2020-05-07 | 2020-05-07 | External degradation loading experimental apparatus of degradable metal |
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| CN111537342B true CN111537342B (en) | 2022-03-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529143A (en) * | 2003-10-09 | 2004-09-15 | 大连大学 | Intelligent electronic detecting instrument for coronary artery scaffold mechanical property |
| CN109187318A (en) * | 2018-07-30 | 2019-01-11 | 西南交通大学 | Intravascular metal degradable high throughput based on micro-fluidic chip simulates monitoring system |
| CN209707332U (en) * | 2019-03-12 | 2019-11-29 | 北京航空航天大学 | It is a kind of for being implanted into the isometric deformation apparatus of degradation experiment outside material bodies |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030153971A1 (en) * | 2002-02-14 | 2003-08-14 | Chandru Chandrasekaran | Metal reinforced biodegradable intraluminal stents |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529143A (en) * | 2003-10-09 | 2004-09-15 | 大连大学 | Intelligent electronic detecting instrument for coronary artery scaffold mechanical property |
| CN109187318A (en) * | 2018-07-30 | 2019-01-11 | 西南交通大学 | Intravascular metal degradable high throughput based on micro-fluidic chip simulates monitoring system |
| CN209707332U (en) * | 2019-03-12 | 2019-11-29 | 北京航空航天大学 | It is a kind of for being implanted into the isometric deformation apparatus of degradation experiment outside material bodies |
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