CN115290448B - NOL ring testing device parameter determining method and testing device - Google Patents
NOL ring testing device parameter determining method and testing device Download PDFInfo
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- CN115290448B CN115290448B CN202211007237.3A CN202211007237A CN115290448B CN 115290448 B CN115290448 B CN 115290448B CN 202211007237 A CN202211007237 A CN 202211007237A CN 115290448 B CN115290448 B CN 115290448B
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- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 abstract description 15
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
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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
- G01N2203/0017—Tensile
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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
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a parameter determining method and a parameter determining device for a NOL ring testing device, which belong to the technical field of strong processing and testing of composite materials. The bottom plate and the top plate are fixed structural members which are arranged on the base in a bolt connection mode, and a sliding dovetail groove guide structure is arranged on the upper surface of the base and used for enabling the sliding block to freely slide in the radial direction after being extruded by the jacking column; corresponding bolt connecting holes are further formed in the base, and the base is convenient to connect with the bottom plate and the top plate. The bottom of the sliding block is provided with a dovetail groove structure, so that the sliding block is conveniently and tightly attached to the dovetail groove of the base in a guiding manner, the arc surface of the inner side profile of the sliding block is provided with an inclined surface, downward movement of the jacking column is conveniently converted into displacement movement of the sliding block, radial expansion of the annular sample piece of the composite material is realized, the stress concentration phenomenon of the annular sample piece of the composite material is relieved, and the simulation of bearing the internal pressure load is more real and reliable.
Description
Technical Field
The invention relates to the field of strong processing and testing of composite materials, in particular to a NOL ring testing device parameter determining method and a NOL ring testing device.
Background
Compared with the traditional metal container, the composite material pressure container has the characteristics of light weight, high specific strength and the like, and the adoption of the composite material is beneficial to greatly reducing the negative quality of products such as vehicle-mounted hydrogen storage cylinders, rocket engines and the like, improving the strength of the pressure container and enhancing the carrying capacity of the pressure container. The composite pressure vessel is often designed to include a hoop wrap and a spiral wrap, and the hoop wrap is primarily responsible for most of the internal pressure loading during the internal pressure loading process. Therefore, in the design and development process of the fiber winding pressure vessel, a composite NOL ring experimental sample is often required to be prepared to test the maximum bearing capacity provided by the material system under the forming process, so that a theory and a data foundation are laid for the design check and experimental test of the fiber winding forming pressure vessel.
Generally, as shown in fig. 1, the conventional testing device for ring NOL (Naval Ordnance Laboratory) of composite material is divided into an upper portion and a lower portion, the middle portion is separated by a certain distance, fig. 2 is a tensile sample of the NOL ring, after the tensile load is applied, the tensile sample of the NOL ring of the spacer section is concentrated in stress, the specific form is shown in fig. 3, and as shown in fig. 3, the NOL of the spacer section is in a significantly straightened state and does not conform to the ideal loading form of the NOL of fig. 4, the deformation form of the tensile sample of the NOL ring is finally in an oval-like state as shown in fig. 5, so that a curvature mutation occurs near the spacer section, and a stress concentration phenomenon exists near the tensile sample of the NOL ring, so that the tensile sample of the NOL ring is actually exerted to have a smaller strength than under an ideal internal pressure load. Therefore, the design of the testing device can decompose and transfer the local stress concentration of the test sample in the testing process, so that the relief of the additional load of the test sample has extremely important significance.
Disclosure of Invention
The invention aims to provide a NOL ring testing device parameter determining method and a NOL ring testing device, so as to solve the problem that stress concentration exists in a ring-shaped experimental sample in the stretching process.
In order to achieve the above object, the present invention provides the following solutions:
A method of determining a parameter of a NOL ring test device, the method comprising:
Estimating NOL test intensity range;
Giving the number of sliding blocks;
Determining the inner contour arc length of the sliding block;
Determining a slider inner profile stress value based on the slider inner profile arc length;
determining the length and width of the dovetail groove;
determining a dovetail root stress value based on the dovetail length and the dovetail width;
determining a metal elastic limit strength value based on the internal profile stress value of the sliding block and the root stress value of the dovetail groove;
judging whether the metal elastic limit strength value meets the strength limit;
if not, the number of the sliders is re-given;
if so, determining the inner diameter of the sliding block, the arc length of the inner contour of the sliding block, the arc length of the outer contour of the sliding block, the length of the dovetail groove and the width of the dovetail groove.
Based on the above method in the present invention, the present invention further provides a NOL ring testing device, the testing device including:
the device comprises a base, wherein a guide groove is formed in the upper surface of the base, and a groove is formed in the lower surface of the base;
the bottom plate is arranged in the groove;
the sliding block is provided with a dovetail groove structure at the bottom, the dovetail groove structure is arranged in the guide groove and matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the plurality of sliding blocks form a circular ring;
The NOL ring experiment sample piece is sleeved on the periphery of a circular ring formed by the sliding blocks;
and the jacking column is positioned in the circular ring, and the downward axial movement of the jacking column drives the radial movement of the sliding block, so that the radial expansion of the NOL ring experimental sample is realized.
Optionally, the top column includes: the cylinder and round platform, the cylinder sets up the upper portion of the big one side of round platform bottom area.
Optionally, the arc surface of the inner side profile of the sliding block is an inclined surface, and the inclined surface is attached to the side wall of the round table.
Optionally, grooves are formed on two sides of the sliding block.
Optionally, a bolt hole is formed in the upper surface of the base.
Optionally, the testing device further includes a top plate, and the top plate is located on the upper surface of the slider and is connected with the base.
Optionally, the dovetail groove structure is in a convex shape.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
According to the method, the equivalent load of the NOL ring experimental sample during damage can be obtained through an experimental equivalent internal pressure method, so that the limit value of the inner contour and the outer contour of the metal sliding block is determined, the preparation is made for the overall structure of the sliding block to be optimized later, the proper inner contour size, the inner diameter, the width of the dovetail groove and the length of the dovetail groove of the sliding block can be obtained according to the optimization flow, and the proper structure of the metal sliding block is also determined.
The experimental testing device comprises a base, a bottom plate, a top plate, a sliding block, a top column and other parts. The bottom plate and the top plate are fixed structural members which are arranged on the base in a bolt connection mode, and a sliding dovetail groove guide structure is arranged on the upper surface of the base and used for enabling the sliding block to freely slide in the radial direction after being extruded by the jacking column; in addition, corresponding bolted connection holes are further formed in the base, the base is convenient to be connected with the bottom plate and the top plate, the base is also convenient to be connected with the universal testing machine, a dovetail groove structure is designed at the bottom of the sliding block, the dovetail groove structure is convenient to be tightly attached to the dovetail groove of the base in a guiding mode, an inclined surface is designed on the arc surface of the inner side profile of the sliding block, downward movement of the jacking column is conveniently converted into displacement movement of the sliding block, so that radial expansion of the annular sample piece of the composite material is achieved, axial movement of the jacking column can be converted into radial movement of the sliding block by the experimental testing device, stress concentration phenomenon of the traditional NOL experimental sample piece testing device can be dispersed to a plurality of sliding block boundaries, the stress concentration phenomenon of the annular sample piece of the composite material is relieved, and the simulation of the annular sample piece of the composite material to bear internal pressure load is more real and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a NOL ring stretching experiment device according to an embodiment of the present invention;
FIG. 2 is a drawing of a NOL ring tensile specimen according to an embodiment of the present invention;
FIG. 3 is a diagram showing the stress and deformation of a sample during tensile testing using a conventional NOL ring tensile testing apparatus according to an embodiment of the present invention;
FIG. 4 is a diagram showing an ideal uniform stress distribution pattern under the internal pressure load of a NOL ring experimental sample according to an embodiment of the present invention;
FIG. 5 is a deformation state of an NOL ring experimental sample during stretching according to an embodiment of the present invention;
FIG. 6 is a flowchart of a method for determining parameters of a NOL ring test device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a sliding expansion of a testing device according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating the stress on a NOL ring test sample according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a slider force according to an embodiment of the present invention;
FIG. 10 is a schematic view of a dovetail configuration in accordance with an embodiment of the present invention;
FIG. 11 is a schematic view of a slider and a wedge angle design of a jack post according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a NOL ring test device according to an embodiment of the present invention without removing the top plate;
Fig. 13 is a schematic diagram of a structure of the NOL ring testing device according to an embodiment of the invention after the top plate is removed.
FIG. 14 is a schematic view of a slider structure according to an embodiment of the present invention;
FIG. 15 is a schematic view of a base structure according to an embodiment of the present invention;
FIG. 16 is a schematic view of a top plate structure according to an embodiment of the present invention;
FIG. 17 is a schematic view of a top pillar according to an embodiment of the present invention;
fig. 18 is a schematic view of a bottom plate structure according to an embodiment of the present invention.
Symbol description:
The device comprises a base seat-1, a bottom plate-2, a sliding block-3, a NOL ring experimental sample piece-4, a top column-5, a dovetail groove structure-6, a bolt avoiding space-7, a cylinder-8, a round table-9, a bolt hole-10 and a top plate-11.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a NOL ring testing device parameter determining method and a NOL ring testing device, so as to solve the problem that stress concentration exists in a ring-shaped experimental sample in the stretching process.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 6 is a flowchart of a method for determining parameters of a NOL ring test device according to an embodiment of the present invention, as shown in fig. 6, the method for determining parameters in the present invention includes the following steps:
step 101: and estimating the NOL test intensity range.
Step 102: the number of sliders is given.
Step 103: the inner contour arc length of the slider is determined.
Step 104: and determining the inner contour stress value of the sliding block based on the inner contour arc length of the sliding block.
Step 105: and determining the length and width of the dovetail groove.
Step 106: and determining a stress value of the root of the dovetail groove based on the length of the dovetail groove and the width of the dovetail groove.
Step 107: and determining a metal elastic limit strength value based on the internal profile stress value of the sliding block and the dovetail root stress value.
Step 108: and judging whether the metal elastic limit strength value meets the strength limit.
Step 109: if not, the number of sliders is re-given.
Step 110: if so, determining the inner diameter of the sliding block, the arc length of the inner contour of the sliding block, the arc length of the outer contour of the sliding block, the length of the dovetail groove and the width of the dovetail groove.
The specific calculation process is as follows:
According to the circumferential expansion deformation of the fiber winding layer, the equivalent external pressure of the NOL ring experimental sample can be obtained according to the back calculation of the pressure vessel film theory, and the equivalent external pressure is as follows:
Wherein: p is the equivalent pressure of the outer contour surface of the sliding block; sigma f is NOL ring section strength; t is NOL ring thickness; d is the NOL ring diameter.
So as to obtain the equivalent pressure load of the outer contour surface of the sliding block, in order to design and determine the inner contour diameter size of the sliding block, the load needs to be equivalent to the inner contour surface, and the equivalent mode is expressed as follows:
wherein: p' is the equivalent pressure of the inner contour of the sliding block; l' is the arc length of the inner contour of the sliding block; l is the arc length of the outer contour of the sliding block.
The experimental device design material 30CrMnSi material is prepared, so that the safety coefficient can be given according to the relation between the material strength and the current equivalent pressure p', and the specific limiting size of the inner contour arc length of the sliding block can be obtained. The concrete expression is as follows:
p'≤σ1 (3)
Wherein: σ 1 is the elastic limit strength value of the metal material.
According to the radial expansion stress deformation, the middle jacking column is required to be designed into a conical structure, so that the wedge angles with different sizes determine the structural strength of the sliding block, the displacement ratio between the radial sliding block and the axial jacking column, and the radial expansion amount of the test sample can be obtained according to the descending displacement of the jacking column without considering the deformation of the metal sliding block in the testing process of the sliding block. Neglecting the additional bending moment generated by the conical surface, the load applied in the radial and axial directions can be expressed as:
wherein: f1 is the radial load value; f2 is the axial load value; and F is the resultant force load value generated by the jack posts on the conical surface. It is possible to obtain from the structural form and the above load split form:
F2＝F1 tanα (5)
And combining a dovetail groove structure at the bottom of the sliding block, and introducing a safety coefficient to obtain a limited range of F2 values:
F2≤λ1ahσ (6)
Wherein: a is the length of a dovetail groove on the sliding block; h is the width of the dovetail groove; lambda 1 is a safety factor; sigma is the elastic limit of the metallic material.
Assuming that the material is T700 Dongli carbon fiber, and the strength value sigma f of the molded NOL ring experimental sample is 2500MPa; the standard dimensions of the NOL test sample were found to be 1.5mm in thickness t and 6mm in width parameter b. And then the equivalent radial pressure generated under the load can be obtained as follows:
because the internal and external outline size parameters and the dovetail groove structure size of the sliding block jointly determine whether the overall strength value of the sliding block meets the requirement of whether the metal sliding block yields in the experimental process, iterative optimization calculation is needed for the number of divided parts of the sliding block and the dovetail groove structure parameter, in order to ensure that the testing device and the NOL ring sample remain attached in the testing process, the thickness of the sliding block is the same as that of the NOL ring sample, and the specific design iterative process is shown in fig. 6.
According to the optimization flow, the structure of the NOL ring test device finally obtained is shown in fig. 7-13.
Considering that the NOL structure is an annular structure, the NOL structure is expected to always present a circumferential expansion state in the loading process, so that the tensile load applied to the NOL ring experimental sample by the original tensile experimental device is required to be converted into a radial expansion load, and the radial movement of the whole experimental sample is realized, and the specific movement relationship is shown in fig. 7. Referring to fig. 7, the test apparatus of the present invention includes: base 1, bottom plate 2, slider 3, NOL ring experiment sample 4, jack-prop 5.
Wherein, the upper surface of the base 1 is provided with a guide groove, and the lower surface of the base is provided with a groove;
The bottom plate 2 is arranged in the groove; fig. 18 is a schematic view of the structure of the base plate of the present invention, wherein the part (a) is a front view and the part (b) is a left side view.
The bottom of the sliding block 3 is provided with a dovetail groove structure 6, as shown in fig. 18, the dovetail groove structure is in a convex shape, the dovetail groove structure 6 is arranged in the guide groove and is matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the sliding blocks are multiple, and the sliding blocks form a circular ring.
The NOL ring experiment sample piece 4 is sleeved on the periphery of a circular ring formed by the sliding blocks;
the jack post is located in the ring, the jack post downward axial motion drives the radial motion of slider, realizes the radial expansion of NOL ring experiment sample, and as shown in FIG. 17, (a) part in FIG. 17 is the front view, (b) part is the left side view, (c) part is the top view, the jack post includes: the round table comprises a cylinder 8 and a round table 9, wherein the cylinder is arranged on the upper part of one surface with a large bottom area of the round table.
The arc surface of the inner side profile of the sliding block is an inclined surface, and the inclined surface is attached to the side wall of the round table.
Referring to fig. 14, it can be seen that the specific details of the structure of the slider are shown in fig. 14, wherein part (a) is a front view, (b) is a left view, (c) is a top view, and part (d) is a partial enlarged view of the dovetail groove structure.
From the schematic structure of the base of the known testing device shown in fig. 15, a part (a) is a front view, and a part (b) is a left view, and in order to ensure that the slider 3 can implement the reciprocating linear expansion motion, a corresponding guide groove is designed on the base. And in order to connect the base and the bottom plate with the universal tester, a connecting bolt hole 10 is formed in the base.
As shown in fig. 16, the testing device of the present invention further includes a top plate, where part (a) in fig. 16 is a front view, and part (b) is a left view, and the top plate is located on the upper surface of the slider and connected to the base 1, and a plurality of bolt holes are also formed in the top plate. Fig. 12 is a schematic view of a testing apparatus without the top plate removed, and fig. 13 is a schematic view of a testing apparatus with the top plate removed, after which a plurality of sliders 3 can be seen to be arranged in a circular ring.
The device and the method have the following beneficial effects:
The invention discloses an optimized composite material circumferential tensile strength experimental loading device and a testing method thereof, belonging to the technical field of strong processing and testing of composite materials. The bottom plate and the top plate are fixed structural members which are arranged on the base in a bolt connection mode, and a sliding dovetail groove guide structure is arranged on the upper surface of the base and used for enabling the sliding block to freely slide in the radial direction after being extruded by the jacking column; in addition, corresponding bolt connection holes are formed in the base, so that the base is convenient to be connected with the bottom plate and the top plate, and the base is convenient to be connected with the universal testing machine. The bottom of the sliding block is provided with a dovetail groove structure, so that the sliding block is conveniently and tightly attached to the dovetail groove of the base in a guiding manner, and the arc surface of the inner side profile of the sliding block is provided with an inclined surface, so that downward movement of the jacking column is conveniently converted into displacement movement of the sliding block, and radial expansion of the annular sample piece of the composite material is realized. So far, this experiment testing arrangement can be with the axial motion of jack-prop change into the radial motion of slider, and can be with traditional NOL experiment sample testing arrangement's stress concentration phenomenon dispersion to a plurality of slider boundaries, has alleviateed the stress concentration phenomenon of combined material annular sample, and is more true, reliable to the simulation that bears the internal pressure load.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. A method for determining parameters of a NOL ring test device, the method being applied to a NOL ring test device, the test device comprising:
the device comprises a base, wherein a guide groove is formed in the upper surface of the base, and a groove is formed in the lower surface of the base;
the bottom plate is arranged in the groove;
the sliding block is provided with a dovetail groove structure at the bottom, the dovetail groove structure is arranged in the guide groove and matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the plurality of sliding blocks form a circular ring;
The NOL ring experiment sample piece is sleeved on the periphery of a circular ring formed by the sliding blocks;
the jacking column is positioned in the circular ring, and the downward axial movement of the jacking column drives the radial movement of the sliding block to realize the radial expansion of the NOL ring experimental sample;
the middle ejector column is of a conical structure, the wedge angles with different sizes determine the structural strength of the sliding block, the displacement ratio between the radial sliding block and the axial ejector column, and the radial expansion of the test sample is obtained according to the descending displacement of the ejector column without considering the deformation of the metal sliding block in the testing process of the sliding block;
the parameter determination method comprises the following steps:
Estimating NOL test intensity range;
Giving the number of sliding blocks;
Determining the inner contour arc length of the sliding block;
Determining a slider inner profile stress value based on the slider inner profile arc length;
determining the length and width of the dovetail groove;
determining a dovetail root stress value based on the dovetail length and the dovetail width;
determining a metal elastic limit strength value based on the internal profile stress value of the sliding block and the root stress value of the dovetail groove;
judging whether the metal elastic limit strength value meets the strength limit;
if not, the number of the sliders is re-given;
if so, determining the inner diameter of the sliding block, the arc length of the inner contour of the sliding block, the arc length of the outer contour of the sliding block, the length of the dovetail groove and the width of the dovetail groove.
2. The NOL ring test apparatus parameter determination method of claim 1 wherein said top post comprises: the cylinder and round platform, the cylinder sets up the upper portion of the big one side of round platform bottom area.
3. The method for determining parameters of the NOL ring testing device according to claim 2, wherein the arc surface of the inner side profile of the slider is an inclined surface, and the inclined surface is attached to the side wall of the circular table.
4. The method for determining parameters of a NOL ring test device according to claim 1, wherein grooves are formed on both sides of the slider.
5. The method for determining parameters of a NOL ring test device according to claim 1, wherein bolt holes are formed in the upper surface of the base.
6. The NOL ring test apparatus parameter determination method of claim 1 wherein said test apparatus further comprises a top plate located on an upper surface of said slider and connected to said base.
7. The NOL ring test device parameter determination method of claim 1 wherein said dovetail configuration is "convex".
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