CN103698214A - Loading method and device for measuring micromechanical property of material under action of stress - Google Patents
Loading method and device for measuring micromechanical property of material under action of stress Download PDFInfo
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- CN103698214A CN103698214A CN201310746964.6A CN201310746964A CN103698214A CN 103698214 A CN103698214 A CN 103698214A CN 201310746964 A CN201310746964 A CN 201310746964A CN 103698214 A CN103698214 A CN 103698214A
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Abstract
The invention provides a loading method and device for measuring micromechanical property of a material under the action of stress. The loading device comprises a main loading device body, a force application cutter and a bolt, wherein the main loading device body is provided with a loading screw hole, a force application cutter clamp groove is formed below the loading screw hole, and two side frames consist of support cutters to serve as a support platform; the force application cutter adopts a sharp wedge shape, and a cutter head in the sharp wedge shape is a round angle; and a thread on the bolt is matched with the loading screw hole of the main loading device body, and a straight groove is formed in the top of a nut, so that the nut is screwed into the loading screw hole and applies positive pressure on the force application cutter. According to the loading device and method, a NanoIndenter (MTS, USA) can be applied conveniently, easily and directly without transformation or processing, so that the loading method is further simplified, and a theoretical calculating value and a true value of the material stress coincide better.
Description
Technical field
The present invention relates to the mechanical property measuring technique of material, especially relate to the charger and the method that are applicable on nano-hardness tester, for measuring the mechanical property of material nanoscale under effect of stress.
Background technology
Nanoindentation, also claim the degree of depth responsive indentation, it is one of method of test material mechanical property, can on nanoscale, measure the various mechanical properties of material, as: (A.C.Fischer-Cripps, the Nanoindentation such as load-displacement curves, elastic modulus, hardness, fracture toughness, strain hardening effect, viscoelasticity or creep behaviour, seconded., Springer, NewYork, 2004).The appearance of nano-hardness tester and application are applied Nanoindentation widely.Result for retrieval from WebofknowledgeSM database can be found out, the report of relevant nano-hardness tester research just occurred since the eighties in 20th century, and increase year by year about the document of its research, quoted passage number about its research has approached 1600 times every year, nano-hardness tester, as one of instrument of research material mechanical property, more and more receives publicity and uses as can be seen here.Yet there be limited evidence currently of has the Micro Mechanical Properties of people's research material under effect of stress, this is to be mainly limited by the requirement of the special-purpose objective table of nano-hardness tester to sample, is difficult to realize the loading to sample.
Tradition charger generally all adopts clock gauge that degree of disturbing is measured afterwards and quantitatively loaded, and charger size design is all excessive, is not suitable at NanoIndenter(MTS, USA) use on nano-hardness tester.
Summary of the invention
The object of the invention is to propose a kind of charger and method of measuring material Micro Mechanical Properties under effect of stress, to realize NanoIndenter(MTS, USA) under the effect of nano-hardness tester measurement external carbuncle, the nanometer dynamic performance of material is target, further develop the research field of nano-hardness tester, making provides concrete experimental program on the nanometer dynamic performance of its material under qualitative and quantitative study effect of stress.
In order to realize object of the present invention, following technical scheme is proposed:
Measure a charger for material Micro Mechanical Properties under effect of stress, described charger comprises charger main body, application of force cutter and screw, wherein,
The door-shaped frame that described charger main body is lower openings, frame roof center arranges loading screw along charger main body axis position, loads screw below application of force cutter draw-in groove is set; Two side frames of described door-shaped frame form by supporting cutter, and the head of described support cutter forms acute angle upwards, and two support cuttves are symmetrical along the main body of charger, as support platform;
Described application of force cutter is a square, at 2/3rds places of two sides of square, cuts sth. askew downwards, forms sharp wedge, and the cutter head of sharp wedge is fillet;
Screw thread on described screw matches with the loading screw of charger main body, and nut top-slitting for screwing in loading screw, and applies normal pressure to application of force cutter.
The long 26mm of described charger main body, wide 15mm, thick 5mm; The cutter head of described support cutter forms 60 degree angles, and the radius of corner of support cutter head is 0.3mm; Described loading screwhole diameter is 3mm, and flight pitch is 0.5mm; The described application of force cutter draw-in groove degree of depth is 2mm, and width is 5mm; The thickness of described application of force cutter is 5mm, the long 6mm of application of force cutter, wide 5mm, and application of force cutter head angle is that the fillet of 60 ° and application of force cutter head is 0.3mm, guarantees that the direction of application of force cutter in loading procedure is all the time in the main body axis of charger; Described screw diameter is 3mm, and screw length is 8mm, and screw spacing is 0.5mm.
The present invention also proposes to use the method for material Micro Mechanical Properties under the measurement effect of stress of described charger, and described method comprises step:
1) prepare processing sample;
2) sample of handling well is assemblied on charger, makes surface to be measured and surface level keeping parallelism;
3), according to experimental design scheme, calculate and load the required degree of disturbing of predetermined elasticity load;
4) according to the degree of disturbing calculating, quantitatively load;
5) charger after loading is fixed on the sample stage of NanoIndenter nano-hardness tester and tests, the test result of nano-hardness tester and the quantitative stress calculating are before corresponding one by one, obtain the Micro Mechanical Properties of material under quantitative effect of stress.
In step 1), the dimensional requirement of described sample is: 16～20mm is long, and 5mm is high, and 1～2mm is thick.Polishing is carried out on the surface to be measured of described sample, and designs breach or pre-crackle; To guarantee reliability and the stability of measurement data.
In step 3), the formula that calculates the required degree of disturbing of loading predetermined elasticity load is as follows:
In formula,
| σ
max| be sample stress maximum, during non-notched specimen, on sample with application of force cutter osculatory on and the same position of another side, and be compressive stress on osculatory, the position on another side is tension, unit is MPa;
F is the power between application of force cutter and sample, and unit is N;
L
sbe two distances between support cutter, unit is mm;
B, h are respectively thickness and the height of sample, and unit is mm;
F
maxfor the degree of disturbing of application of force cutter place sample, unit is mm;
E is the macroscopic elastic modulus of sample, and unit is GPa;
θ is that application of force cutter place sample degree of disturbing is f
maxtime screw required loading angle.
In step 4), the method quantitatively loading comprises that degree of disturbing or the direct load angle by screw of by clock gauge, measuring material application of force cutter place quantitatively load; During described test, the maximum stress value of material should not surpass elastic limit of materials, if surpassed, when calculating, need to consider the plastic deformation behavior of material.
Advantage of the present invention:
Charger and the method for the present invention's design can very easily, simply, directly apply to NanoIndenter(MTS, USA) nano-hardness tester, and do not need instrument to transform, process.The present invention has further simplified loading method, by utilization, has the screw of fixing flight pitch to load sample, degree of disturbing is measured and is directly reduced to the load angle of screw, thereby simplified loading procedure.Application of force cutter in the present invention, support cutter all meet People's Republic of China's iron and steel industry industry standard (YB/T5349-2006) requirement, make the calculated value of the suffered stress of material and actual value more identical.
Accompanying drawing explanation
Figure 1A, Figure 1B, Fig. 1 C are charger main body three-view diagrams;
Fig. 2 A, Fig. 2 B, Fig. 2 C are application of force cutter three-view diagrams;
Fig. 3 A, Fig. 3 B, Fig. 3 C are screw three-view diagrams;
Fig. 4 A, Fig. 4 B, Fig. 4 C are laboratory sample three-view diagrams;
Fig. 5 is the charger schematic diagram after experiment loads.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
During the nanometer dynamic performance of the present invention's material under qualitative and quantitative study effect of stress, need to process and be applicable to NanoIndenter(MTS, USA) charger of nano-hardness tester, and according to experiment purpose, design the test specimen that meets charger, after according to experiment purpose, sample being loaded, utilize nano-hardness tester to test the sample loading.
Fig. 1-Fig. 3 shows respectively the three-view diagram of charger main body, application of force cutter and the screw of charger.Its size is as shown in mark in figure, and unit is mm;
(a) shaped as frame that charger main body is hollow, lower openings; Position, frame roof center arranges loading screw, and loading screw below is application of force cutter draw-in groove, and two side frames of charger main body form by supporting cutter, supports cutter head and forms acute angle upwards, as support platform.The long 26mm of charger main body, wide 15mm, thick 5mm.In charger main body, two support cuttves are symmetrical along the main body of charger, and supporting cutter head angle and be 60 ° and the fillet that supports cutter head is 0.3mm; Loading screw along charger main body axis adopts the screw that diameter is 3mm, and flight pitch is 0.5mm; The application of force cutter draw-in groove degree of depth is 2mm, and width is 5mm, for guarantee application of force cutter in the direction of loading procedure all the time in the main body axis of charger.
(b) application of force cutter is roughly a square, at 2/3rds places of two sides, cuts sth. askew, and forms sharp wedge, and cutter head is fillet.The thickness of application of force cutter is 5mm, the long 6mm of application of force cutter, wide 5mm, and application of force cutter head angle is that the fillet of 60 ° and application of force cutter head is 0.3mm.
(c) screw requires to adopt the screw that diameter is 3mm, and screw spacing is 0.5mm, and the screw thread on screw matches with the loading screw of charger main body, and screw length is 8mm.Nut backs down groove, for screwing in the loading screw of charger main body, and application of force cutter is applied to normal pressure.
Fig. 4 shows laboratory sample, and laboratory sample dimensional requirement as shown in the figure.Acceptable being of a size of: 16～20mm(is long) * 5mm(is high) * 1～2mm(is thick), can experimental object on the face of needs, design breach (pre-crackle etc.).
Polishing need to be carried out in the surface to be measured of laboratory sample, to guarantee reliability and the stability of measurement data.
Fig. 5 is the charger schematic diagram after laboratory sample loads.As shown in the figure, laboratory sample lies on application of force cutter, and application of force cutter draw-in groove is inserted on application of force cutter top, and cutter head withstands laboratory sample middle part; Screw precession loads screw, withstands application of force cutter top, and the screw-in by screw promotes application of force cutter to the laboratory sample application of force, and directly the load angle by screw quantitatively loads.
Experimentation
By above-mentioned analysis, the requirement of experiment according to setting, loads material, after loading, sample is fixed on to NanoIndenter(MTS, USA) on the specific objective table of nano-hardness tester, after loading, pictorial diagram is as shown in Figure 5.Make surface to be measured and surface level keeping parallelism, and test according to experimental design.
When the specific design of charger, can have certain variation, but the circumscribed circle diameter of charger should not surpass 30mm, the design of test specimen can be modified according to experiment purpose in tolerance interval, as design breach or pre-crackle etc.
When quantitative calculating elastic stress, need to calculate according to formula, the maximal value stress value of material should not surpass elastic limit of materials during quantitative test in principle, if surpassed, when calculating, need to consider the plastic deformation behavior of material.
The invention provides two kinds of methods that quantitatively load, a kind of is to load (needing clock gauge to measure the degree of disturbing at material application of force cutter place) by measurement degree of disturbing, and another kind of simple method is that the direct load angle by screw quantitatively loads (not needing clock gauge to measure the degree of disturbing at material application of force cutter place).
Utilize formula to calculate and load the required degree of disturbing (during quantitative test) of predetermined elasticity load:
In formula,
| σ
max| for sample stress maximum (during non-notched specimen, on sample with application of force cutter osculatory on and the same position of another side, and be compressive stress on osculatory, the position on another side is tension), unit is MPa;
F is the power between application of force cutter and sample, and unit is N;
L
sbe two distances between support cutter, unit is mm;
B, h are respectively thickness and the height of sample, and unit is mm;
F
maxfor the degree of disturbing of application of force cutter place sample, unit is mm;
E is the macroscopic elastic modulus of sample, and unit is GPa;
θ is that application of force cutter place sample degree of disturbing is f
maxtime screw required loading angle.
So far, can calculate the required load rule of experiment and calculate sample inside stress intensity everywhere, so that follow-up quantitative test is used.
The quantitative Micro Zone Mechanical Properties analysis of the non-notch plane plate specimen of now take is example, by the processing sample shown in Fig. 4 A, Fig. 4 B and Fig. 4 C and polishing is carried out in surface to be tested, after the sample of handling well is assembled, be fixed on NanoIndenter(MTS, USA) the enterprising line correlation test of the sample stage of nano-hardness tester.When sample assembles, need utilize quantitative computing formula and according to experimental design scheme, calculate the scheme of loading, the quantitative stress that the test result of nano-hardness tester just can and calculate before is like this corresponding one by one, obtains the Micro Mechanical Properties of material under quantitative effect of stress.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect have been carried out to further detailed description; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a charger of measuring material Micro Mechanical Properties under effect of stress, is characterized in that: described charger comprises charger main body, application of force cutter and screw, wherein,
The door-shaped frame that described charger main body is lower openings, frame roof center arranges loading screw along charger main body axis position, loads screw below application of force cutter draw-in groove is set; Two side frames of described door-shaped frame form by supporting cutter, and the head of described support cutter forms acute angle upwards, and two support cuttves are symmetrical along the main body of charger, as support platform;
Described application of force cutter is a square, at 2/3rds places of two sides of square, cuts sth. askew downwards, forms sharp wedge, and the cutter head of sharp wedge is fillet;
Screw thread on described screw matches with the loading screw of charger main body, and nut top-slitting for screwing in loading screw, and applies normal pressure to application of force cutter.
2. charger according to claim 1, is characterized in that: the long 26mm of described charger main body, wide 15mm, thick 5mm; The cutter head of described support cutter forms 60 degree angles, and the radius of corner of support cutter head is 0.3mm; Described loading screwhole diameter is 3mm, and flight pitch is 0.5mm; The described application of force cutter draw-in groove degree of depth is 2mm, and width is 5mm; The thickness of described application of force cutter is 5mm, the long 6mm of application of force cutter, wide 5mm, and application of force cutter head angle is that the fillet of 60 ° and application of force cutter head is 0.3mm, guarantees that the direction of application of force cutter in loading procedure is all the time in the main body axis of charger; Described screw diameter is 3mm, and screw length is 8mm, and screw spacing is 0.5mm.
3. the method for using material Micro Mechanical Properties under the measurement effect of stress of charger as claimed in claim 1 or 2, is characterized in that: described method comprises step:
1) prepare processing sample;
2) sample of handling well is assemblied on charger, makes surface to be measured and surface level keeping parallelism;
3), according to experimental design scheme, calculate and load the required degree of disturbing of predetermined elasticity load;
4) according to the degree of disturbing calculating, quantitatively load;
5) charger after loading is fixed on the sample stage of NanoIndenter nano-hardness tester and tests, the test result of nano-hardness tester and the quantitative stress calculating are before corresponding one by one, obtain the Micro Mechanical Properties of material under quantitative effect of stress.
4. the method for material Micro Mechanical Properties under measurement effect of stress according to claim 3, is characterized in that: in step 1), the dimensional requirement of described sample is: 16～20mm is long, and 5mm is high, and 1～2mm is thick.
5. the method for material Micro Mechanical Properties under measurement effect of stress according to claim 4, is characterized in that: in step 1), polishing is carried out on the surface to be measured of described sample, and designs breach or pre-crackle; To guarantee reliability and the stability of measurement data.
6. the method for material Micro Mechanical Properties under measurement effect of stress according to claim 5, is characterized in that: in step 3), calculate that to load the formula of the required degree of disturbing of predetermined elasticity load as follows:
In formula,
| σ
max| be sample stress maximum, during non-notched specimen, on sample with application of force cutter osculatory on and the same position of another side, and be compressive stress on osculatory, the position on another side is tension, unit is MPa;
F is the power between application of force cutter and sample, and unit is N;
L
sbe two distances between support cutter, unit is mm;
B, h are respectively thickness and the height of sample, and unit is mm;
F
maxfor the degree of disturbing of application of force cutter place sample, unit is mm;
E is the macroscopic elastic modulus of sample, and unit is GPa;
θ is that application of force cutter place sample degree of disturbing is f
maxtime screw required loading angle.
7. the method for material Micro Mechanical Properties under measurement effect of stress according to claim 6, it is characterized in that: in step 4), the method quantitatively loading comprises that degree of disturbing or the direct load angle by screw of by clock gauge, measuring material application of force cutter place quantitatively load; During described test, the maximum stress value of material should not surpass elastic limit of materials, if surpassed, when calculating, need to consider the plastic deformation behavior of material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105527184A (en) * | 2016-01-18 | 2016-04-27 | 南京航空航天大学 | Nanometer press mark measuring system |
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| JPH10132718A (en) * | 1996-10-30 | 1998-05-22 | Mitsubishi Heavy Ind Ltd | Method for testing fracture toughness using micro test piece |
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Patent Citations (4)
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| JPH10132718A (en) * | 1996-10-30 | 1998-05-22 | Mitsubishi Heavy Ind Ltd | Method for testing fracture toughness using micro test piece |
| CN201327459Y (en) * | 2008-12-23 | 2009-10-14 | 孙平 | Small-sized self-balance spiral loading frame |
| CN202903617U (en) * | 2012-10-29 | 2013-04-24 | 吉林大学 | In-situ three-point bending test device |
| CN103308498A (en) * | 2013-05-14 | 2013-09-18 | 中国科学院物理研究所 | Direction-controlled uniaxial strain applying device for two-dimensional layered nano material |
Non-Patent Citations (1)
| Title |
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| 赵显武等: "应力和电场单独或耦合作用下PZT-5H卸载压痕裂纹的扩展", 《金属学报》 * |
Cited By (1)
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| CN105527184A (en) * | 2016-01-18 | 2016-04-27 | 南京航空航天大学 | Nanometer press mark measuring system |
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