CN115728144A - Ultrasonic-stress coupling bone simulation material characterization equipment and method by taking crystal as medium - Google Patents
Ultrasonic-stress coupling bone simulation material characterization equipment and method by taking crystal as medium Download PDFInfo
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- CN115728144A CN115728144A CN202211510920.9A CN202211510920A CN115728144A CN 115728144 A CN115728144 A CN 115728144A CN 202211510920 A CN202211510920 A CN 202211510920A CN 115728144 A CN115728144 A CN 115728144A
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Abstract
The invention provides a device and a method for representing an ultrasonic-stress coupling bone simulation material by taking a crystal as a medium, wherein the device comprises: the pressure testing machine comprises a movable platen, an upper bearing plate, a base and a lower bearing plate, wherein a probe accommodating cavity communicated with the lower surface is arranged in the upper bearing plate, a first crystal plate is arranged at an opening, a probe accommodating cavity is arranged in the lower bearing plate, and a second crystal plate is arranged at the opening; the first ultrasonic probe and the second ultrasonic probe are respectively arranged in the probe accommodating cavities of the upper bearing plate and the lower bearing plate and are respectively attached to the first crystal plate and the second crystal plate in opposite directions. The invention can realize dynamic detection of ultrasonic signals while performing classical pressure test on the bone material, and the obtained dynamic ultrasonic signals can be used as characterization data to assist in evaluating the consistency of the bone simulation material and the bone material, thereby being beneficial to promoting the development of the bone simulation material, the establishment of a bone finite element model, the research of bone physiology and the like.
Description
Technical Field
The invention relates to the field of material testing, in particular to ultrasonic-stress coupling bone simulation material characterization equipment and method by taking a crystal as a medium.
Background
The bone is a complex and precise biological material, and the bone simulation material is difficult to accurately simulate the biomass itself in consideration of the complexity of the structure and the diversity of the microstructure of the bone composition substances, so that it is a key research direction in the field to make the performance of the simulation material consistent with that of the living body as much as possible.
At present, in common bone mechanical property tests, researchers only examine limited indexes such as density, tensile and compressive forces, young modulus, yield stress and the like. A paper "Compressive properties of Compressive available polyurethane foams as mechanical models for osteoporotic human candle bone" in Patel P S D, shepherd D E T, hukins D W L [ J]BMC musculoskeletal disks, 2008,9 (1): 1-7, and Oroszl ny
A paper of comprehensive properties of commercial available PVC foams incorporated for use as mechanical modules for human cancer bone [ J]Acta Polytechnica Hungarica 2015,12 (2): 89-101. In all, researchers were preliminary obtaining materials that could mimic human cancellous and normal bone by performing quasi-static compression tests on the modeled materials to determine their Young's modulus, yield strength, and absorbed energy. However, there are limits to using several limited indexes such as density, tensile stress, young's modulus, yield stress, etc. as the criteria for judging the consistency of the material performance, and further comparative study on these materials is required to obtain more convincing results. Therefore, if one characterization means, namely one more verified index, can be added, the evaluation and simulation effect on the consistency of the material will be more convincing.
Ultrasonic testing is a technique for nondestructive detection of macroscopic defects, microstructures, and mechanical properties of materials, which is very sensitive to changes in the internal structure of the material. For example, chinese patent CN2891973U discloses an ultrasonic bone density measurement and analysis device, which utilizes the characteristic performance of ultrasonic waves on material density, structure and material to evaluate the quality of bone, which indicates that the ultrasonic waves have feasibility as a characterization means of bone simulation materials. However, the information obtained by ultrasonic static probing alone is far from characterizing bone-mimicking materials. Chinese patent CN101915807A discloses an ultrasonic testing auxiliary device for non-metal material damage process, which tests the damage process of the non-metal material by testing the change of the ultrasonic wave speed in the damage process of the non-metal material, however, the device can only test the dynamic information of the ultrasonic wave speed, and considering that the medium between the ultrasonic probe and the material sample is air, and the loss of the ultrasonic wave is very large when the air is used as the medium, therefore, the collected information can not be used as the characterization means of the bone simulation material.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide an apparatus and a method for characterizing a bone simulation material by ultrasound-stress coupling using a crystal as a medium.
The invention provides an ultrasonic-stress coupling bone simulation material characterization device taking a crystal as a medium, which is characterized by comprising the following components: the pressure testing machine comprises a movable platen capable of lifting, an upper bearing plate arranged on the movable platen, a base and a lower bearing plate arranged on the base, wherein a probe accommodating cavity communicated with the lower surface is formed in the upper bearing plate, a first crystal plate is arranged at an opening at the lower end of the probe accommodating cavity, a probe accommodating cavity communicated with the upper surface is formed in the lower bearing plate, and a second crystal plate is arranged at an opening at the upper end of the probe accommodating cavity; and the first ultrasonic probe and the second ultrasonic probe are respectively arranged in the probe accommodating cavity of the upper bearing plate and the probe accommodating cavity of the lower bearing plate and are respectively attached to the first crystal plate and the second crystal plate in a clinging manner to be oppositely installed, wherein any one ultrasonic probe is used for transmitting an ultrasonic signal, and the other ultrasonic probe is used for acquiring the ultrasonic signal.
In the ultrasonic-stress coupling bone simulation material characterization device taking the crystal as the medium, the device can also have the following characteristics: coupling agents are coated between the contact surfaces of the first ultrasonic probe and the first crystal plate and between the contact surfaces of the second ultrasonic probe and the second crystal plate so as to reduce interface effect.
In the ultrasonic-stress coupling bone simulation material characterization device taking the crystal as the medium, the device can also have the following characteristics: the upper bearing plate and the lower bearing plate respectively comprise a sleeve part and a plate body part which are connected, the sleeve part of the upper bearing plate is arranged on the movable bedplate through an upper bearing plate joint, the plate body part of the upper bearing plate is connected to the lower end of the sleeve part, the center of the plate body part is provided with a stepped hole which is vertically communicated and corresponds to the inner cavity of the sleeve part, the sleeve part of the lower bearing plate is arranged on the base through a lower bearing plate joint, the plate body part of the lower bearing plate is connected to the upper end of the sleeve part, and the center of the plate body part is provided with a stepped hole which is vertically communicated and corresponds to the inner cavity of the sleeve part; the first crystal plate is fitted into the lower end of the stepped hole of the upper bearing plate, and the lower surface thereof is flush with the lower surface of the plate body portion of the upper bearing plate, and the second crystal plate is fitted into the upper end of the stepped hole of the lower bearing plate, and the upper surface thereof is flush with the upper surface of the plate body portion of the lower bearing plate.
Further, in the ultrasonic-stress coupled bone simulation material characterization device using the crystal as the medium provided by the invention, the ultrasonic-stress coupled bone simulation material characterization device can also have the following characteristics: the upper bearing plate joint and the lower bearing plate joint are both in a T-shaped cylindrical shape, the large-diameter end of the upper bearing plate joint is arranged on the upper surface of the movable bedplate, the small-diameter end of the upper bearing plate joint downwards penetrates through the movable bedplate and is connected with the sleeve portion of the upper bearing plate, the large-diameter end of the lower bearing plate joint is connected with the base, and the small-diameter end of the lower bearing plate joint upwards is connected with the sleeve portion of the lower bearing plate.
Furthermore, in the ultrasonic-stress coupling bone simulation material characterization device using the crystal as the medium provided by the invention, the ultrasonic-stress coupling bone simulation material characterization device can also have the following characteristics: the first ultrasonic probe is arranged in the stepped hole of the upper bearing plate and connected with the small-diameter end of the joint of the upper bearing plate in a threaded connection mode, and the second ultrasonic probe is arranged in the stepped hole of the lower bearing plate and connected with the small-diameter end of the joint of the lower bearing plate in a threaded connection mode.
In the ultrasonic-stress coupling bone simulation material characterization device with the crystal as the medium, the device can also have the following characteristics: the first crystal plate and the second crystal plate are made of transparent pressure-resistant crystals.
The invention also provides a characterization method of the ultrasonic-stress coupling bone simulation material by taking the crystal as the medium, which has the characteristics that the characterization device of the ultrasonic-stress coupling bone simulation material by taking the crystal as the medium comprises the following steps: performing a pressure test on a material sample of the bone simulation material by using a pressure tester, wherein in the process of performing pressure damage on the material sample by a pressure bearing plate and a second crystal plate under the matching of an upper pressure bearing plate and a first crystal plate, ultrasonic signals are conducted according to the paths of the first crystal plate, the material sample and the second crystal plate or the opposite path through a first ultrasonic probe and a second ultrasonic probe, and the decay data of the ultrasonic signals are synchronously recorded; and analyzing the obtained ultrasonic signal decay data to obtain the dynamic structure information in the material sample.
Action and Effect of the invention
According to the device and the method for representing the bone simulation material by using the crystal as the medium and ultrasonic-stress coupling, the device comprises a pressure testing machine and two ultrasonic probes, wherein probe accommodating cavities are formed in an upper pressure bearing plate and a lower pressure bearing plate of the pressure testing machine, the crystal plate is installed at the opening of the cavity and serves as the medium of ultrasonic waves, the two ultrasonic probes are respectively arranged in the probe accommodating cavities of the upper pressure bearing plate and the lower pressure bearing plate and are respectively and oppositely installed in a mode of being tightly attached to the corresponding crystal plate, when the device is used, the bone simulation material can be dynamically detected while a classical pressure test is carried out on the bone material, the obtained dynamic ultrasonic signals can serve as representation data to assist in evaluating the consistency of the bone simulation material and the bone material, therefore, the device and the method provide a new representation device and a new representation method for the simulation of the bone material, and are beneficial to promoting the development of the aspects of the development of the bone simulation material, the establishment of a finite element model, the research of bone physiology and the like.
Drawings
FIG. 1 is a schematic overall structure diagram of an ultrasonic-stress coupling bone simulation material characterization device with a crystal as a medium in an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view of an ultrasound-stress coupled bone-mimicking material characterization apparatus with a crystal as a medium in an embodiment of the present invention;
fig. 3 is an exploded schematic view of a partial structure of an ultrasonic-stress coupling bone simulation material characterization device with a crystal as a medium in the embodiment of the invention.
Description of reference numerals:
1 a sample of a material; 10, a pressure tester; 11 moving the platen; 12, an upper bearing plate; 121 a sleeve portion; 122 a plate body part; 1221 a stepped bore; 13 a base; 14 lower bearing plate; 141 a sleeve portion; 142 a plate body portion; 1421 a stepped hole; 15 an upper bearing plate joint; 16 lower bearing plate joints; 17 a first pin; 18 a second pin; 20 a first ultrasound probe; 30 a second ultrasound probe; 40 a first crystal plate; 50 second wafer plate.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically explained in the following with the attached drawings.
Examples
Fig. 1 is a schematic diagram of the overall structure of an ultrasonic-stress coupling bone simulation material characterization device with a crystal as a medium, and fig. 2 is a partial sectional view of the ultrasonic-stress coupling bone simulation material characterization device with the crystal as a medium.
As shown in fig. 1 and fig. 2, the present embodiment provides an ultrasonic-stress coupling bone simulation material characterization apparatus using a crystal as a medium, which includes a compression tester 10, a first ultrasonic probe 20, and a second ultrasonic probe 30.
The pressure testing machine 10 is a classical material pressure testing machine, and mainly comprises a movable platen 11 driven by a lifting mechanism to lift, an upper pressure bearing plate 12 installed on the movable platen 11, a base 13 arranged below the movable platen 11, and a lower pressure bearing plate 14 installed on the base 13.
The probe containing cavities of the upper bearing plate 12 are communicated with the lower surface of the upper bearing plate 12, the first crystal plate 40 which is flush with the lower surface is installed at the opening of the lower end of the upper bearing plate 12, the probe containing cavity of the lower bearing plate 14 is communicated with the upper surface, the second crystal plate 50 which is flush with the upper surface is installed at the opening of the upper end of the lower bearing plate, and the first crystal plate 40 and the second crystal plate 50 can be made of diamond, zircon or other existing pressure-resistant crystals.
The first ultrasonic probe 20 and the second ultrasonic probe 30 are respectively arranged in a probe accommodating cavity of the upper pressure bearing plate 12 and a probe accommodating cavity of the lower pressure bearing plate 14 and are respectively attached to the first crystal plate 40 and the second crystal plate 50 in an opposite manner, any one of the first ultrasonic probe 20 and the second ultrasonic probe 30 is used for transmitting an ultrasonic signal, the other ultrasonic probe is used for acquiring an ultrasonic signal, and thus, the ultrasonic signal can be transmitted and received according to the path of the crystal, the material sample 1 and the crystal during the pressure test.
The following provides a detailed description of a part of the mounting structure.
Fig. 3 is an exploded schematic view of a part of the structure of the ultrasonic-stress coupling bone simulation material characterization device with a crystal as a medium.
As shown in fig. 2 and 3, the mounting structure of the movable platen 11 and the upper pressure bearing plate 12 is specifically: a T-shaped cylindrical upper bearing plate joint 15 is centrally installed on the movable platen 11, a large-diameter end of the upper bearing plate joint 15 is arranged on the upper surface of the movable platen 11, and a small-diameter end of the upper bearing plate joint 15 is arranged to penetrate through the movable platen 11 downwards. The upper pressure bearing plate 12 includes a sleeve portion 121 and a plate portion 122 connected to each other, the sleeve portion 121 of the upper pressure bearing plate 12 is fitted over the small-diameter end of the upper pressure bearing plate joint 15 and is connected to the small-diameter end of the upper pressure bearing plate joint 15 by a first pin 17 disposed in a radial direction, the plate portion 122 of the upper pressure bearing plate 12 is connected to the lower end of the sleeve portion 121, a stepped hole 1221 penetrating vertically and corresponding to an inner cavity of the sleeve portion 121 is formed in the center of the plate portion 122, and the stepped hole 1221 is a probe accommodating cavity of the upper pressure bearing plate 12.
The first crystal plate 40 is fitted into the lower end of the stepped hole 1221, the lower surface of the first crystal plate 40 is flush with the lower surface of the plate portion 122 of the upper pressure receiving plate 12, and the first crystal plate 40 and the plate portion 122 of the upper pressure receiving plate 12 are used to directly apply pressure to the material sample 1 during the test. First ultrasonic probe 20 sets up in shoulder hole 1221, the head of first ultrasonic probe 20 down and hug closely the upper surface setting of first crystal board 40, scribble the couplant between the head of first ultrasonic probe 20 and the upper surface of first crystal board 40 in order to reduce interface effect, the afterbody of first ultrasonic probe 20 has the screw portion, the path end that goes up bearing plate joint 15 is seted up threaded hole along the axis, first ultrasonic probe 20 passes through the screw portion and is connected with the path end that goes up bearing plate joint 15 with the screw hole cooperation.
The mounting structure of base 13 and lower bearing plate 14 specifically is: the base 13 is provided with a lower bearing plate joint 16 in a T-shaped cylindrical shape, the large-diameter end of the lower bearing plate joint 16 is connected with the base 13 through a plurality of screws uniformly distributed along the circumferential direction, and the small-diameter end of the lower bearing plate joint 16 is arranged upwards. The lower bearing plate 14 includes a sleeve portion 141 and a plate portion 142 connected to each other, the sleeve portion 141 of the lower bearing plate 14 is fitted over the small-diameter end of the lower bearing plate joint 16 and is connected to the small-diameter end of the lower bearing plate joint 16 by a second pin 18 radially disposed, the plate portion 142 of the lower bearing plate 14 is connected to the upper end of the sleeve portion 141, a stepped hole 1421 penetrating vertically and corresponding to the inner cavity of the sleeve portion 141 is formed in the center of the plate portion 142, and the stepped hole 1421 is a probe accommodating cavity of the lower bearing plate 14.
Wherein the second crystal plate 50 is fitted into the upper end of the stepped hole 1421, the upper surface of the second crystal plate 50 is flush with the upper surface of the plate portion 142 of the lower pressure bearing plate 14, and the second crystal plate 50 and the plate portion 142 of the lower pressure bearing plate 14 are used to support the material sample 1. The second ultrasonic probe 30 is arranged in the stepped hole 1421, the head of the second ultrasonic probe 30 faces upward and is tightly attached to the lower surface of the second crystal plate 50, a coupling agent is coated between the head of the second ultrasonic probe 30 and the lower surface of the second crystal plate 50 to reduce an interface effect, the tail of the second ultrasonic probe 30 is provided with a threaded column portion, a threaded hole is formed in the small-diameter end of the lower bearing plate joint 16 along the axis, and the second ultrasonic probe 30 is connected with the small-diameter end of the lower bearing plate joint 16 through the matching of the threaded column portion and the threaded hole.
The method and the process for characterizing the bone simulation material by using the device are as follows: during the test, the material sample 1 of the bone simulation material is placed on the plate body portion 142 of the lower pressure bearing plate 14 and the second crystal plate 50, the compression testing machine 10 is started, the movable platen 11 drives the upper pressure bearing plate 12 to move downwards until the plate body portion 122 of the upper pressure bearing plate 12 and the first crystal plate 40 contact the material sample 1, and the compression fracture of the material sample 1 is started. During the process of pressure damage to the material sample 1, the first ultrasonic probe 20 and the second ultrasonic probe 30 transmit and receive ultrasonic signals according to the path of the first crystal plate 40, the material sample 1, and the second crystal plate 50, or vice versa, and simultaneously detect and record ultrasonic signal decay data through an ultrasonic detector or other devices connected with the ultrasonic probes. Further, the dynamic structure information in the material sample 1 can be obtained by performing data analysis on the ultrasonic signal decay data through a computer or other instruments, and the dynamic structure information can be used for assisting in evaluating the consistency of the bone simulation material and the bone material.
It should be noted that, for those skilled in the art, in the actual test, the test is not limited to the pressure test and the ultrasonic coupling, and the test can also be realized by the tensile test, the bending test, the shearing test and the like and the ultrasonic coupling; the material sample is not limited to the bone simulation material, and other materials can be adopted for testing and characterization; the material of the first crystal plate 40 and the second crystal plate 50 as the ultrasonic wave conductive medium can be transparent pressure-resistant crystals, and can be further coupled with other characterization means such as optical signals.
Effects and effects of the embodiments
According to the device and the method for representing the bone simulation material by using the crystal as the medium and ultrasonic-stress coupling, the device comprises a pressure testing machine and two ultrasonic probes, wherein probe accommodating cavities are formed in an upper pressure bearing plate and a lower pressure bearing plate of the pressure testing machine, the crystal plate is installed at the opening of the cavity and serves as the medium of ultrasonic waves, the two ultrasonic probes are respectively arranged in the probe accommodating cavities of the upper pressure bearing plate and the lower pressure bearing plate and are respectively and oppositely installed in a mode of being tightly attached to the corresponding crystal plate, when the device is used, the bone simulation material can be dynamically detected while the bone material is subjected to classical pressure testing, the obtained dynamic ultrasonic signals can serve as representation data, and the consistency of the bone simulation material and the bone material is evaluated in an auxiliary mode.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (7)
1. An ultrasonic-stress coupling bone simulation material characterization device taking a crystal as a medium is characterized by comprising:
the compression testing machine comprises a movable bedplate capable of lifting, an upper bearing plate arranged on the movable bedplate, a base and a lower bearing plate arranged on the base,
a probe containing cavity communicated to the lower surface is arranged in the upper bearing plate, a first crystal plate is arranged at the opening at the lower end of the probe containing cavity,
a probe accommodating cavity communicated with the upper surface is formed in the lower bearing plate, and a second crystal plate is installed at an opening at the upper end of the probe accommodating cavity; and
the first ultrasonic probe and the second ultrasonic probe are respectively arranged in the probe containing cavity of the upper bearing plate and the probe containing cavity of the lower bearing plate and are respectively and tightly attached to the first crystal plate and the second crystal plate to be oppositely installed, any one ultrasonic probe is used for transmitting ultrasonic signals, and the other ultrasonic probe is used for acquiring the ultrasonic signals.
2. The ultrasound-stress coupled bone-simulating material characterization apparatus of claim 1, wherein:
wherein coupling agents are coated between the contact surfaces of the first ultrasonic probe and the first crystal plate and between the contact surfaces of the second ultrasonic probe and the second crystal plate to reduce interface effects.
3. The ultrasound-stress coupled bone-simulating material characterization apparatus of claim 1, wherein:
wherein the upper bearing plate and the lower bearing plate respectively comprise a sleeve part and a plate part which are connected,
the sleeve part of the upper bearing plate is arranged on the movable bedplate through an upper bearing plate joint, the plate body part of the upper bearing plate is connected with the lower end of the sleeve part, the center of the plate body part is provided with a stepped hole which is vertically communicated and corresponds to the inner cavity of the sleeve part,
the sleeve part of the lower bearing plate is arranged on the base through a lower bearing plate joint, the plate body part of the lower bearing plate is connected to the upper end of the sleeve part, and the center of the plate body part is provided with a stepped hole which is vertically communicated and corresponds to the inner cavity of the sleeve part;
the first crystal plate is embedded at the lower end of the stepped hole of the upper bearing plate, and the lower surface of the first crystal plate is flush with the lower surface of the plate body part of the upper bearing plate,
the second crystal plate is fitted in the upper end of the stepped hole of the lower pressure bearing plate, and the upper surface thereof is flush with the upper surface of the plate body portion of the lower pressure bearing plate.
4. The ultrasound-stress coupled bone-mimicking material characterization device of claim 3, wherein:
wherein the upper bearing plate joint and the lower bearing plate joint are both in a T-shaped cylindrical shape,
the large-diameter end of the upper bearing plate joint is arranged on the upper surface of the movable bedplate, the small-diameter end of the upper bearing plate joint downwards penetrates through the movable bedplate and is connected with the sleeve part of the upper bearing plate,
the large-diameter end of the lower bearing plate joint is connected with the base, and the small-diameter end of the lower bearing plate joint faces upwards and is connected with the sleeve part of the lower bearing plate.
5. The ultrasound-stress coupled bone-simulating material characterization apparatus of claim 4, wherein:
wherein the first ultrasonic probe is arranged in the stepped hole of the upper bearing plate and is connected with the small-diameter end of the joint of the upper bearing plate in a threaded connection way,
the second ultrasonic probe is arranged in the stepped hole of the lower bearing plate and is connected with the small-diameter end of the joint of the lower bearing plate in a threaded connection mode.
6. The ultrasound-stress coupled bone-mimicking material characterization device of claim 1, wherein:
the first crystal plate and the second crystal plate are made of transparent pressure-resistant crystals.
7. A method for characterizing a crystal as a medium by using an ultrasonic-stress coupling bone simulation material is characterized in that the method adopts the device for characterizing the crystal as the medium by using the ultrasonic-stress coupling bone simulation material according to any one of claims 1 to 6, and comprises the following steps:
performing a pressure test on a material sample of the bone simulation material by using a pressure tester, wherein in the process of performing pressure damage on the material sample by a pressure bearing plate and a second crystal plate under the matching of an upper pressure bearing plate and a first crystal plate, ultrasonic signals are conducted according to the paths of the first crystal plate, the material sample and the second crystal plate or the opposite path through a first ultrasonic probe and a second ultrasonic probe, and the decay data of the ultrasonic signals are synchronously recorded;
and analyzing the obtained ultrasonic signal decay data to obtain the dynamic structure information in the material sample.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510920.9A CN115728144A (en) | 2022-11-29 | 2022-11-29 | Ultrasonic-stress coupling bone simulation material characterization equipment and method by taking crystal as medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211510920.9A CN115728144A (en) | 2022-11-29 | 2022-11-29 | Ultrasonic-stress coupling bone simulation material characterization equipment and method by taking crystal as medium |
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| CN115728144A true CN115728144A (en) | 2023-03-03 |
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| CN202211510920.9A Pending CN115728144A (en) | 2022-11-29 | 2022-11-29 | Ultrasonic-stress coupling bone simulation material characterization equipment and method by taking crystal as medium |
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