CN114838693B - Connecting device for measuring indentation depth by using displacement meter and using method - Google Patents
Connecting device for measuring indentation depth by using displacement meter and using method Download PDFInfo
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- CN114838693B CN114838693B CN202210251718.2A CN202210251718A CN114838693B CN 114838693 B CN114838693 B CN 114838693B CN 202210251718 A CN202210251718 A CN 202210251718A CN 114838693 B CN114838693 B CN 114838693B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
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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
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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
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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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
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Health & Medical Sciences (AREA)
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- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a connecting device for measuring indentation depth by using a displacement meter and a measuring method thereof, the connecting device comprises a pressure head, a displacement meter and a pressure head connecting device, wherein a first end of the pressure head connecting device is provided with a cavity for installing the pressure head, the central axis of the cavity is coincident with the central axis of the pressure head connecting device, the displacement meter is parallel to the pressure head, the displacement meter is fixedly connected with the pressure head connecting device through the displacement meter connecting device, and the end of the displacement meter is flush with the end of the pressure head and is used for measuring the indentation action depth of the pressure head. The device and the measuring method thereof have the advantages of simple structure, high accuracy of measuring the indentation depth, deformation of the indentation depth measuring result by test equipment and a tool, and small influence of the clamping verticality of the displacement meter. The device can accurately measure the indentation depth, thereby improving the accuracy of calculating the mechanical property of the measured material through indentation effect information.
Description
Technical Field
The invention belongs to the technical field of mechanical property testing of metal and nonmetal materials, and particularly relates to a connecting device for measuring indentation depth by using a displacement meter and a using method thereof.
Background
The nondestructive mechanical property test of the in-service material is a key for evaluating the service state and reliability of the in-service material. The micro-indentation technology is a technology for nondestructively detecting mechanical properties, which is developed in recent years. The method comprises the steps of driving a spherical pressure head through a motor, vertically pressing the spherical pressure head into the surface of a measured material, carrying out repeated loading and partial unloading circulation processes on the same action point, measuring the indentation depth and the load, obtaining a load-indentation depth curve of the whole micro-indentation test process, converting the curve into a true stress-true plastic strain curve of the material, establishing a mechanical constitutive relation model of the material, and correlating the mechanical properties of the material such as tensile strength, yield strength, indentation deformation energy, strain hardening index, strength coefficient and the like. Compared with a hardness test, the micro-indentation technology can obtain more mechanical property parameters, has high accuracy, has the characteristics of no damage and rapidness, and is particularly suitable for on-site detection of the mechanical properties of in-service materials.
In the micro-indentation test, the indentation depth measurement precision directly determines the calculation precision of the mechanical property of the measured material, and how to accurately measure the indentation depth is one of the keys of the micro-indentation test. The existing indentation depth measuring method comprises the following steps: 1, obtaining the action depth through the beam displacement of the pressure head driving mechanism. The method does not need an additional measuring device, but calculates the deformation of the whole equipment in the indentation depth during the test, and even if the rigidity of the equipment is corrected, a large error is generated with the actual action depth. 2 measuring the indentation size of the tested material after the test, and calculating the action depth by combining the geometric relationship of the indenter. The method is an indirect measurement method, has low efficiency, and has larger indentation depth measurement error due to elastic rebound effect during unloading.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a connecting device for measuring indentation depth by using a displacement meter and a measuring method thereof. The device can accurately measure the indentation depth, thereby improving the accuracy of calculating the mechanical property of the measured material through indentation effect information.
One of the purposes of the invention is to adopt the following technical scheme: the utility model provides an use displacement meter to measure connecting device of indentation degree of depth, includes pressure head, displacement meter and pressure head connecting device, the first end of pressure head connecting device has seted up the vestibule that is used for installing the pressure head, the central axis of vestibule coincides with pressure head connecting device's central axis, and the displacement meter is parallel with the pressure head, and displacement meter passes through displacement meter connecting device and pressure head connecting device fixed connection, and the displacement meter end is parallel and level mutually with the end of pressure head for measure the indentation degree of depth of action of pressure head.
Preferably, the displacement meters are arranged at two sides of the pressure head connecting device symmetrically.
As the preferable scheme, the displacement meter connecting device is provided with two outer annular grooves which are formed on the outer cylindrical surface of the pressure head connecting device and correspond to the tail parts of the pressure heads, and the opposite ends of the two displacement meter connecting devices are tightly clamped in the outer annular grooves of the pressure head connecting device.
As the preferred scheme, displacement connecting device includes arc connecting portion, horizontal segment, vertical section and displacement meter installation section, and the butt joint terminal surface of arc connecting portion is formed with arc recess, arc recess with outer annular groove looks adaptation is formed with corresponding fastening screw in the both sides of arc recess, horizontal segment is mutually perpendicular with pressure head connecting device, vertical section is extended to the opposite direction that the pressure head stretches out by the one end of horizontal segment, and displacement meter installation section meets with vertical section, and mutually perpendicular with pressure head connecting device, is formed with the installation through-hole that is used for fixed displacement meter at the outer tip of displacement meter installation section one side of installation through-hole is provided with the second jackscrew screw, and the installation through-hole is linked together with the second jackscrew.
As the preferred scheme, still include testing machine connecting device, testing machine connecting device includes first connecting portion and second connecting portion, and first connecting portion and second connecting portion coaxial setting, first connecting portion meet with testing machine interface, and the second connecting portion meets with the one end of first connecting portion, and the other end of first connecting portion is formed with the internal thread hole that is used for being connected with pressure head connecting device, and pressure head connecting device is provided with internal thread hole matched with external screw thread head with the tip that the pressure head is relative.
The second purpose of the invention adopts the following technical scheme:
the application method of the connecting device for measuring the indentation depth by using the displacement meter specifically comprises the following steps:
step one, screwing an external thread head at one end of a pressure head connecting device into an internal thread hole of a connecting device of the testing machine;
the arc-shaped connecting parts at one end of the two displacement meter connecting devices are butt-mounted in an outer annular groove of the pressure head connecting device, and are screwed into fastening screw holes at two sides of the arc-shaped groove through fastening bolts for fixing after being aligned;
step three, one end of a pressure head is placed into a hole cavity at one end of the pressure head connecting device, the exposed side of the pressure head is pressed by hands to enter the hole cavity, and a first jackscrew bolt is screwed into a first jackscrew hole of the pressure head connecting device until the pressure head is fixed in the pressure head connecting device;
step four, connecting the assembled device with a testing machine through a testing machine connecting device;
step five, respectively placing the two displacement meters into the mounting through holes of the displacement meter connecting devices at the two sides, adjusting the displacement meters to be level with the end heads of the pressure heads, enabling the end heads of the displacement meters and the pressure heads to be positioned in the same plane, respectively screwing the second jackscrew bolts into the second jackscrew holes at the side surfaces of the displacement meter connecting devices, and completing fastening of the displacement meters;
step six, placing the sample below the pressure head, and placing a gasket with proper thickness below the displacement meter according to the shape and the size of the sample, so as to start test detection;
and step seven, acquiring the numerical values of the displacement meters at the two sides, and calculating the average measured value of the two displacement meters to be used as a final indentation depth measuring result.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the invention improves the structure, so that the scheme has the advantages of simplicity, reasonability, high accuracy of indentation depth measurement and small influence of the deformation of test equipment and a tool and the verticality of the clamping of a displacement meter on the indentation depth measurement result. The indentation depth can be accurately measured through the device, so that the mechanical property characterization precision is improved. The specific analysis is as follows: according to the scheme, the longitudinal distance between the joint of the displacement meter and the pressure head is reduced as much as possible, so that the interference of deformation of equipment and a connecting device to a measuring result in the indentation depth measuring process is reduced, and the indentation depth measuring accuracy is remarkably improved. And the joint of the two sides of the outer part of the displacement meter connecting device is higher than the arc-shaped connecting part, so that after the displacement meter is installed, the test contact of the displacement meter and the test pressure head are positioned on the same plane, and the problem that the test contact of the displacement meter is obviously lower than the pressure head after the displacement meter is installed due to the fact that the longitudinal distance between the joint of the displacement meter and the pressure head is too small is avoided. According to the scheme, interference of deformation of test equipment and the tool to indentation depth measurement is reduced as much as possible, and the requirement of accurate indentation depth measurement in indentation test is met.
According to the scheme II, the two symmetrically installed displacement meters are used, and the average value of the two displacement meters is read, so that interference of the displacement meters, which are not perpendicular to the horizontal surface in the installation process of the displacement meters, on indentation depth measurement is reduced, and the influence of the installation of the displacement meters on the accuracy of indentation depth measurement is reduced.
Thirdly, the measuring method of the scheme is improved by combining the connecting device, after the connecting device is additionally arranged on the testing machine before measurement, the measuring device is used for assisting in measuring the depth of the indentation, two sides of the connecting device are respectively connected with a displacement meter, when a single test is carried out, the measuring data of the two indentation depths are read, the average measured value of the two displacement meters is taken as the indentation depth, errors generated when deformation of two sides is uneven or stress is not perpendicular to a testing plane are greatly reduced, and the measuring efficiency and the measuring precision of the displacement meter are effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a connection device of the present invention;
FIG. 2 is a schematic view of an assembly of the connecting device of the present invention;
FIG. 3 is a schematic view of the interfacing of the displacement meter connection;
FIG. 4 is a graph of indentation load versus depth for a single displacement meter connected under a cross beam of a testing machine as in the prior art;
FIG. 5 is a graph of indentation load versus depth for a device of the present invention coupled with a dual displacement meter test;
the marks in the figure: 1. the testing machine comprises a testing machine connecting device 11, an internal threaded hole 2, a pressure head connecting device 21, a hole cavity 22, an external annular groove 23, an external threaded head 24, a first jackscrew hole 3, a displacement connecting device 301, a first jackscrew bolt 302, a second jackscrew bolt 303, a fastening bolt 31, an arc connecting part 311, an arc groove 312, a fastening screw hole 32, a horizontal section 33, a vertical section 34, a displacement meter mounting section 341, a mounting through hole 342, a second jackscrew hole 4, a displacement meter 5 and a pressure head.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It is to be understood that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
It should be noted that: unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used in the specification and claims of this application, the terms "a," "an," and "the" and similar referents are not to be construed to limit the scope of at least one. The word "comprising" or "comprises", and the like, indicates that elements or items listed thereafter or equivalents thereof may be substituted for elements or items thereof in addition to those listed thereafter or equivalents thereof without departing from the scope of the word "comprising" or "comprising".
As shown in fig. 1, the present embodiment provides a connection device for measuring indentation depth by using a displacement meter, which mainly comprises a testing machine connection device 1, a pressure head connection device 2, two displacement meter connection devices 3, two displacement meters 4 and a pressure head 5, wherein the testing machine connection device 1, the pressure head connection device 2 and the pressure head 5 are coaxially connected from top to bottom. The pressure head 5 is arranged in the pressure head connecting device 2 along the bottom hole cavity 21, the displacement meter connecting devices 3 are symmetrically arranged on two sides of the pressure head connecting device 2, the displacement meter 4 is arranged at one end of the displacement meter connecting device 3 far away from the pressure head connecting device 2, and the pressure head connecting device 2 is connected under the testing machine connecting device 1.
In this scheme, the whole of testing machine connecting device 1 comprises two sections of cylinder structures that the diameter is different, and the shape size of upper portion matching testing machine interface is used for being connected with the testing machine, and the lower part center is opened there is central screw hole for being connected with pressure head connecting device 2. Specifically, the tester connection device 1 may adopt the following structure: the device comprises a first connecting part and a second connecting part, wherein the first connecting part and the second connecting part are coaxially arranged, the first connecting part is connected with a tester interface, the second connecting part is connected with one end of the first connecting part, and an internal threaded hole 11 used for being connected with a pressure head connecting device 2 is formed at the other end of the first connecting part.
In this embodiment, as shown in fig. 1, the main body of the pressure head connecting device 2 is cylindrical, the upper portion of the pressure head connecting device is provided with an external thread head 23 for connecting with the internal thread hole 11 of the testing machine connecting device 1, the bottom center of the pressure head connecting device 2 is provided with a cavity 21, a side surface of the pressure head connecting device 2 near one end of the cavity 21 is provided with a first top thread hole 24, the first top thread hole 24 is vertical and communicated with the cavity 21, and the central axis of the cavity 21 coincides with the central axis of the main body of the pressure head connecting device 2. The mounting end of the pressure head 5 is arranged in the cavity 21 of the pressure head connecting device 2, and then the first jackscrew bolt 301 is screwed into the first jackscrew screw hole 24 on the side for fastening. An outer annular groove 22 is formed on the outer cylindrical surface of the pressure head connecting device 2 corresponding to the tail part of the pressure head 5, and the opposite ends of the two displacement connecting devices 3 are tightly clamped in the outer annular groove 22 on the pressure head connecting device 2.
Referring to fig. 2 and 3, the displacement connecting device 3 includes an arc connecting portion 31, a horizontal section 32, a vertical section 33 and a displacement meter mounting section 34, the butt end surface of the arc connecting portion is formed with an arc groove 311, the arc groove 311 is matched with the outer ring groove 22, fastening screw holes 312 are formed at both sides of the arc groove 311, and the fastening screw holes 312 can connect both parts of the displacement meter connecting device 3 with the ram connecting device 2 through bolts. The horizontal section 32 is perpendicular to the ram connecting device 2, the vertical section 33 extends from one end of the horizontal section 32 to the opposite direction of the ram 5, the displacement meter mounting section 34 is connected with the vertical section 33 and perpendicular to the ram connecting device 2, a mounting through hole 341 for the displacement meter 4 is formed at the outer end of the displacement mounting section 34, and a second jackscrew screw hole 342 is arranged at one side of the mounting through hole 341 and communicated with the mounting through hole. The second jackscrew bolt 302 is penetrated into the second jackscrew hole 342 to fix the displacement meter 4, and one side of the installation through hole 341 is higher than one end of the arc-shaped connecting part 31, so that the contact of the displacement meter 4 and the pressure head 5 are in the same horizontal plane after the assembly is finished, and the measurement is convenient. Two sides of the displacement meter connecting device 3 are respectively connected with a displacement meter 4.
According to the scheme, by improving, the measuring error of the displacement meter 4 is reduced to the lowest possible, the displacement meter 4 is directly arranged at the pressure head 5, and the influence of tool deformation is eliminated. (in the prior art, the depth of action of the indentation is measured by using a displacement meter, the displacement meter is connected below a cross beam of the testing machine, so that the interference of deformation of the cross beam of the testing machine on measurement is avoided, but the deformation of a tool connected with a pressure head below the cross beam is still calculated in the depth of action of the indentation, and the perpendicularity requirement on the clamping of the displacement meter is high by using a single displacement meter measuring method at present, and if the displacement meter is not perpendicular to a test surface, the measuring result of the displacement meter has great deviation.). The average measured value of the two displacement meters 4 is taken as the indentation depth in the test, so that errors generated when deformation at two sides is uneven or stress is not perpendicular to a test plane are greatly reduced, and the installation efficiency of the displacement meters 4 is improved.
The application method of the device comprises the following steps: a. screwing an external thread head 23 at one end of the pressure head connecting device 2 into an internal thread hole 11 of the testing machine connecting device 1; b. the arc-shaped connecting part 31 at one end of the two displacement meter connecting devices 3 is relatively arranged in the outer annular groove 22 of the pressure head connecting device 2, and after alignment, the fastening bolts 303 are screwed into the fastening screw holes 312 at two sides to fasten; c. placing the pressure head 5 into a circular hole 21 at one end of the pressure head connecting device 2, pressing the exposed side of the pressure head 5 by hand, screwing a first jackscrew bolt 301 into a first jackscrew hole 24 of the pressure head connecting device 2 until the pressure head 5 is fixed in the pressure head connecting device 2; d. connecting the assembled device with a testing machine through a testing machine connecting device 1; e. respectively placing the two displacement meters 4 into the mounting through holes 341 of the displacement meter connecting devices 3 at the two sides, adjusting the displacement meters 4 to be vertical to the horizontal plane by visual inspection, respectively screwing the second jackscrew bolts 302 into the second jackscrew screw holes 342 at the side surfaces of the round holes of the displacement meter connecting devices 3, and fastening the displacement meters 4; f. placing a sample below the pressure head 5, and placing a gasket with proper thickness below the displacement meter 4 according to the shape and the size of the sample, so that the test can be started; the pad can be stacked by a plurality of thin pads, the total thickness of the thin pads is basically the same as or the same as that of the sample, and the corresponding thin pads can be increased, decreased and adjusted according to the thickness of the sample during use; g. the values of the two side displacement meters 4 are obtained, and the average measured value of the two displacement meters 4 is obtained to be used as a final indentation depth measurement result.
After the detection is finished, the disassembly sequence is the reverse sequence of the assembly process: h. the second jackscrew bolt 302 is unscrewed, and the displacement meter 4 is taken out of the displacement meter connecting device 3; i. removing the device from the testing machine; j. the first jackscrew bolt 301 is screwed out, the pressure head 5 is taken out from the pressure head connecting device 2, the fastening bolt 303 is screwed out, and the displacement meter connecting device 3 is taken out from the pressure head connecting device 2; k. and screwing the pressure head connecting device 2 out of the testing machine connecting device 1, thus completing the disassembly.
In the invention, after polishing treatment is carried out on the surface of a certain 5-series aluminum alloy plate, a single displacement meter is respectively connected below a cross beam of a testing machine for carrying out indentation test, and the device is used for connecting a double displacement meter for carrying out indentation test for comparison, as shown in fig. 4 and 5. Fig. 4 shows an indentation load-depth curve measured by connecting a single displacement meter under a cross beam of a testing machine in the prior art, wherein a larger arc section appears in an initial section of the indentation load-depth curve due to deformation of a tool under the cross beam, and an arc appears in an unloading curve when the load is smaller. While fig. 5 shows the characteristic of approximately straight line rising at the initial section of the indentation load-depth curve, and shows good straight line characteristics during unloading, when the device is used for indentation test, the measurement of the indentation depth can effectively avoid the interference of deformation of the tester and the connecting device on the measurement result.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (4)
1. A connection device for measuring indentation depth using a displacement meter, characterized in that: the pressure head comprises a pressure head, a displacement meter and a pressure head connecting device, wherein a first end of the pressure head connecting device is provided with a cavity for installing the pressure head, the central axis of the cavity is coincident with the central axis of the pressure head connecting device, the displacement meter is parallel to the pressure head, the displacement meter is fixedly connected with the pressure head connecting device through the displacement meter connecting device, and the end head of the displacement meter is level with the end head of the pressure head and is used for measuring the indentation action depth of the pressure head; the two displacement meter connecting devices are arranged, an outer annular groove is formed on the outer cylindrical surface of the pressure head connecting device corresponding to the tail part of the pressure head, and the opposite ends of the two displacement meter connecting devices are tightly hooped in the outer annular groove of the pressure head connecting device; the displacement connecting device comprises an arc connecting part, a horizontal section, a vertical section and a displacement meter mounting section, wherein an arc groove is formed on the butt joint end face of the arc connecting part, the arc groove is matched with the outer annular groove, corresponding fastening screw holes are formed on two sides of the arc groove, the horizontal section is perpendicular to the pressure head connecting device, the vertical section extends from one end of the horizontal section to the opposite direction of the pressure head, the displacement meter mounting section is connected with the vertical section and perpendicular to the pressure head connecting device, an installation through hole for fixing the displacement meter is formed in the outer end portion of the displacement meter mounting section, a second jackscrew hole is formed in one side of the installation through hole, and the installation through hole is communicated with the second jackscrew hole.
2. A connecting device for measuring indentation depth using a displacement meter as recited in claim 1, wherein: the displacement meters are arranged in two and symmetrically arranged on two sides of the pressure head connecting device.
3. A connecting device for measuring indentation depth using a displacement meter as recited in claim 1, wherein: the testing machine connecting device comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are coaxially arranged, the first connecting part is connected with a testing machine interface, the second connecting part is connected with one end of the first connecting part, an internal threaded hole used for being connected with a pressure head connecting device is formed in the other end of the first connecting part, and an external threaded head matched with the internal threaded hole is arranged at the end part of the pressure head connecting device, opposite to the pressure head.
4. A method of using a coupling device for measuring indentation depth using a displacement meter as claimed in any one of claims 1-3, characterized in that: the method specifically comprises the following steps:
step one, screwing an external thread head at one end of a pressure head connecting device into an internal thread hole of a connecting device of the testing machine;
the arc-shaped connecting parts at one end of the two displacement meter connecting devices are butt-mounted in an outer annular groove of the pressure head connecting device, and are screwed into fastening screw holes at two sides of the arc-shaped groove through fastening bolts for fixing after being aligned;
step three, one end of a pressure head is placed into a hole cavity at one end of the pressure head connecting device, the exposed side of the pressure head is pressed by hands to enter the hole cavity, and a first jackscrew bolt is screwed into a first jackscrew hole of the pressure head connecting device until the pressure head is fixed in the pressure head connecting device;
step four, connecting the assembled device with a testing machine through a testing machine connecting device;
step five, respectively placing the two displacement meters into the mounting through holes of the displacement meter connecting devices at the two sides, adjusting the displacement meters to be level with the end heads of the pressure heads, enabling the end heads of the displacement meters and the pressure heads to be positioned in the same plane, respectively screwing the second jackscrew bolts into the second jackscrew holes at the side surfaces of the displacement meter connecting devices, and completing fastening of the displacement meters;
step six, placing the sample below the pressure head, and placing a gasket with proper thickness below the displacement meter according to the shape and the size of the sample, so as to start test detection;
and step seven, acquiring the numerical values of the displacement meters at the two sides, and calculating the average measured value of the two displacement meters to be used as a final indentation depth measuring result.
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