CN100582733C - Double-taper pressure head for measuring mechanical properties of material - Google Patents
Double-taper pressure head for measuring mechanical properties of material Download PDFInfo
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- CN100582733C CN100582733C CN200710017633A CN200710017633A CN100582733C CN 100582733 C CN100582733 C CN 100582733C CN 200710017633 A CN200710017633 A CN 200710017633A CN 200710017633 A CN200710017633 A CN 200710017633A CN 100582733 C CN100582733 C CN 100582733C
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- pressure head
- taper
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- cone
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Abstract
The invention discloses a double taper pressure head for measuring material mecharics property, which is constituted of a bottom and a top, taper semiangles of the bottom and the top are different, wherein taper semiangle ranges of the bottom and the top are 0<theta1<90 DEG, 0<theta2<90 DEG, height ranges of the bottom and the top are 0.1<h1<2000 micron, 0.1<h2<2000 micron. Shape of the bottom and the top of the pressure head is taper, pyramid or prismoid. Material of the pressure head is diamond, tungsten carbide, hard alloy, tool steel, or sedimentation film or spray coating on matrix. The double taper pressure head has two different taper angels, when the pressure head is pressed into measured sample, the two different taper angles correspond to two different character strain. In this way, by one pressing process, material hardness, material yield strength and plastic strain exponent are obtained, and other mechanical property parameters are determined.
Description
Technical field
The present invention relates to a kind of double-cone pressure head, particularly a kind of double-cone pressure head that is used to measure material mechanical performance.
Background technology
Being pressed into experiment is nondestructive and easy application when obtaining material property, therefore usually is used for carrying out the measurement of material mechanical performance.For example the hardness of material just usually utilizes plunging to measure, and measuring method commonly used has methods such as Bu Shi method, Rockwell method, Vickers method, Nu Shi method, nanometer plunging.In concrete test process, all must use the hard pressure head of a spherical indenter or taper, be pushed down into sample surfaces in given load, by the width of measuring impression or the area that the degree of depth obtains impression, again through calculating hardness number.It is less that spherical indenter is pressed into the degree of depth of material surface, causes that material strain is less, makes material be in the elastic-plastic deformation stage substantially, is difficult to characterize the strain-stress relation under the big strained condition, also is difficult to compare with general tapered pressure head test result.
Because conical indenter can characterize the strain-stress relation under the big strained condition, therefore obtain more applications.Conical indenter often has only single cone angle at present, is single tapering pressure head.In use the pressure head cone angle is influential to process of press in, and cone angle is more little, and compression distance is big more.The pressure head of single tapering has unique feature strain, can only with curves of stress-strain relationship on a bit corresponding, can not obtain yield strength and plastic strain index and other simultaneously by the definite mechanical property parameters of stretching experiment.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of double-cone pressure head that is used to measure material mechanical performance is provided, can on the basis that does not change existing measuring system, only change pressure head, obtain more mechanical property parameters.
Technical scheme of the present invention is achieved in that
This pressure head is made up of bottom and top two parts, and the bottom has the different half-angles of projection with top, and its underpart and upper cone half-angle scope are 0＜θ
1＜90 °, 0＜θ
2＜90 °, altitude range is respectively 0.1＜h
1＜2000 microns, 0.1＜h
2＜2000 microns.
The upper and lower shape of pressure head is circular cone, pyramid or terrace with edge.
The material of pressure head is deposit film or a spray-on coating on adamas, tungsten carbide, wimet, tool steel or the matrix.
Double-cone pressure head of the present invention has two different cone angles, and when pressure head is pressed in the process of tested sample, two different cone angle correspondences two different feature strains.By a process of press in, not only can obtain the hardness of material like this, obtain material yield intensity and plastic strain index simultaneously, and then determine other mechanical property parameters.
Double-cone pressure head of the present invention can be used for any being pressed in the test macro, be pressed into test macro etc. as Brinell tester, Rockwell hardometer, Vickers, Knoop hardness tester, nanometer, on the basis that does not change existing measuring system, only change pressure head, obtain other mechanical property parameters, be particularly useful for the situation that performance change etc. can not directly be used stretching experiment.Adopt double-cone pressure head of the present invention can pass through a process of press in, provide the mechanical property evaluation of material microscopic fields quickly, be adapted at promotion and application in relevant enterprise of material microcosmic field tests and the R﹠D institution, the material and the process choice of material microscopic fields had certain directive significance.
Description of drawings
Accompanying drawing 1 is a double tapered conical pressure header structure synoptic diagram among the present invention;
Accompanying drawing 2 is double tapered rectangular pyramid pressure head structure synoptic diagram among the present invention;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
Below in conjunction with specific embodiment content of the present invention is further described:
Double-cone pressure head of the present invention is made up of bottom 1 and top 2 two parts, and bottom 1 has different height and cone angle with top 2.The scope of the half-angle of projection is 0＜θ
1＜90 °, 0＜θ
2＜90 °.When pressure head is pressed in the process of tested sample, two different cone angle correspondences two different feature strains, can obtain material yield intensity and plastic strain index simultaneously, and then determine other mechanical property parameters.
Above-mentioned double-cone pressure head bottom 1 can be identical with top 2 versions, for example the double tapered circular cone pressure head of compositions such as circular cone, pyramid, round platform, double tapered triangular pyramid pressure head, double tapered rectangular pyramid pressure head, double tapered round platform pressure head etc.; The double-cone pressure head bottom also can be different with superstructure, promptly combined by any two kinds of difformities in the shapes such as circular cone, pyramid, terrace with edge and sphere.
The material of pressure head can be that deposit film or spray-on coating and other are suitable for making other material of pressure head on adamas, tungsten carbide, wimet, tool steel or the matrix.The job operation of pressure head can be on machining, sintering, the matrix on vapor deposition film, the matrix method such as spray-on coating make.
The pressure head that the present invention makes can to measure hardness corresponding with the pressure head of routine, and pressure head is pushed down into specimen surface in given load, when compression distance at h
1When following, obtain hardness number by universal method.When compression distance at h
1When above, utilize following formula to calculate hardness number:
Wherein K is the constant relevant with angle, works as θ
1Greater than θ
2The time get negative sign, work as θ
1Less than θ
2The time get positive sign.
As shown in Figure 1, for the double tapered conical pressure header structure synoptic diagram among the present invention, form by the circular cone of bottom 1 and the round platform two parts on top 2.Its half-angle of projection is respectively θ
1, θ
2, its scope is 0＜θ
1＜90 °, 0＜θ
2＜90 °; Highly be respectively h
1, h
2, its scope is 0.1＜h
1＜2000 microns, 0.1＜h
2＜2000 microns.
As shown in Figure 2, for the double tapered pyramid pressure head structure synoptic diagram among the present invention, form by the pyramid of bottom 1 and the terrace with edge two parts on top 2.Its structural parameters are identical with pressure head among Fig. 1.
The half-angle of projection of double tapered pyramid pressure head of the present invention must be different, just can reach the requirement of different taperings.
Double-cone pressure head of the present invention bottom 1 can be made up of different shapes with top 2, and for example bottom 1 is that circular cone, top 2 are terrace with edge, and structural parameters are respectively θ
1Be 30 degree, θ
2Be 60 degree, height h
1Be 1 micron, h
2It is 1 micron;
Perhaps bottom 1 is that pyramid, top 2 are round platform, and structural parameters are respectively θ
1Be 70 degree, θ
2Be 45 degree, height h
1Be 10 microns, h
2It is 10 microns;
Perhaps bottom 1 is that round platform, top 2 are terrace with edge, and structural parameters are respectively θ
1Be 20 degree, θ
2Be 70 degree, height h
1Be 100 microns, h
2It is 100 microns;
Perhaps bottom 1 is that terrace with edge, top 2 are round platform, and structural parameters are respectively θ
1Be 20 degree, θ
2Be 70 degree, height h
1Be 100 microns, h
2It is 100 microns;
Perhaps bottom 1 is a pyramid, and top 2 is round platform, and structural parameters are respectively θ
185 degree; θ
2Be 50 degree, height h
1Be 1900 microns, h
2It is 1900 microns;
Adopt adamas double tapered circular cone pressure head as shown in Figure 1, the half-angle of projection is θ respectively
1Be 70.3 degree, θ
2Be 42.3 degree, height h
1Be 1 micron, h
2Equal 2 microns.45 carbon steels are tested, and compression distance is 2 microns, can determine also that according to formula (1) Vickers hardness is 480MPa.Be respectively 0.033 and 0.126 corresponding to 70.3 degree and the 42.3 feature strains of spending and can determine that yield strength is 180MPa, plastic strain index is 0.2.
Claims (3)
1. double-cone pressure head that is used to measure material mechanical performance, this pressure head constitutes one by bottom (1) and top (2) two parts, it is characterized in that bottom (1) has the different half-angles of projection with top (2), its underpart (1) and top (2) half-angle of projection scope are respectively 0＜θ
1＜90 °, 0＜θ
2＜90 °; Altitude range is respectively 0.1＜h
1＜2000 microns, 0.1＜h
2＜2000 microns.
2. double-cone pressure head according to claim 1 is characterized in that, the top of pressure head (2) shape is a round platform, and the shape of bottom (1) is circular cone or round platform.
3. double-cone pressure head according to claim 1 is characterized in that, pressure head bottom (1) is identical with the material of top (2), and material is adamas, tungsten carbide, wimet or tool steel, deposit film or spray-on coating on the matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710017633A CN100582733C (en) | 2007-04-06 | 2007-04-06 | Double-taper pressure head for measuring mechanical properties of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710017633A CN100582733C (en) | 2007-04-06 | 2007-04-06 | Double-taper pressure head for measuring mechanical properties of material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101055237A CN101055237A (en) | 2007-10-17 |
| CN100582733C true CN100582733C (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710017633A Expired - Fee Related CN100582733C (en) | 2007-04-06 | 2007-04-06 | Double-taper pressure head for measuring mechanical properties of material |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102478474A (en) * | 2010-11-26 | 2012-05-30 | 王严岩 | Hardness testing method and usage thereof |
| CN105675419B (en) * | 2016-01-14 | 2018-05-22 | 西南交通大学 | Biconial press-in prediction material single shaft constitutive relation assay method |
| CN108225864B (en) * | 2018-01-19 | 2020-10-20 | 国电锅炉压力容器检验中心 | Method for measuring elongation of material |
| CN114295495A (en) * | 2021-12-14 | 2022-04-08 | 黄冈师范学院 | Metal material micro-punching shear test and Brinell hardness measurement combined device |
-
2007
- 2007-04-06 CN CN200710017633A patent/CN100582733C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| Determination of plastic properties of metals by instrumentedindentation using different sharp indenters. J.L.Bucaille et al.Acta Materialia,Vol.51 No.6. 2003 |
| Determination of plastic properties of metals by instrumentedindentation using different sharp indenters. J.L.Bucaille et al.Acta Materialia,Vol.51 No.6. 2003 * |
| 压入深度与膜厚对薄膜与基体复合硬度及弹性模量的影响. 徐可为等.金属学报，第32卷第1期. 1996 |
| 压入深度与膜厚对薄膜与基体复合硬度及弹性模量的影响. 徐可为等.金属学报，第32卷第1期. 1996 * |
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| CN101055237A (en) | 2007-10-17 |
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