CN206787949U - A kind of single shear performance testing device for being widely used in minute sample - Google Patents
A kind of single shear performance testing device for being widely used in minute sample Download PDFInfo
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- 238000010008 shearing Methods 0.000 claims abstract description 108
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- 238000012545 processing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 33
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- 238000010276 construction Methods 0.000 abstract 1
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- 238000011056 performance test Methods 0.000 description 12
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- 229910052802 copper Inorganic materials 0.000 description 5
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Abstract
A kind of single shear performance testing device for being widely used in minute sample, it is the shear for meeting following requirements：It is made up of the down cut even (1) and even (2) combinations of pairs of upper shearing of centrosymmetric structure, and single shearing occasionally forms as follows：Be fastenedly connected portion (7), basic courses department (6), coordinate align portion (4)；Wherein, basic courses department (6) is cylindrical shape, is fastenedly connected portion (7), cooperation aligns axial direction of the portion (4) along basic courses department (6) and is arranged in its both ends；Portion (7), basic courses department (6) are fastenedly connected, is coordinated and is aligned portion (4) three and be fixedly connected as overall integral structure；Two even cooperations of shearing align and the axial cuboid sample cell (5) run through are provided perpendicular in portion (4).The utility model applicability is wide, and construction is simple, and cost is low, workable, and technique effect is excellent, and it has expected more huge economic value and social value.
Description
Technical field
The Technical Design and applied technical field of material shearing performance test are the utility model is related to, is specifically provided
A kind of single shear performance testing device for being widely used in minute sample.
Background technology
Shearing shows as component under the lateral external forces effect of position close proximity in opposite direction equal in magnitude, two power it
Between cross section the changing of the relative positions occurs, the lateral external forces of the two position close proximities in opposite direction equal in magnitude are referred to as shearing force,
The section that detrusion occurs is referred to as shear surface, and the ratio of shearing force and shear surface area is referred to as shear stress.According to component by
Shearing, can be divided into single shear and double-shear by the mode of action of the shearing force arrived, and single shear shows as shearing force and acts only on structure
One section of part；Double-shear then shows as shearing force while acts on two sections of component.
The power for causing material damage is all shearing force, although a series of deformations such as stretching, compression, torsion are macroscopically shown as
A variety of modes of texturing, but it is microcosmic on be all material internal dislocation in the presence of shearing force along specific direction
Produced with plane and slide and then cause macroscopic deformation or the fracture of material, that is to say, that cause the power of material deformation and failure real
Matter is all shearing force.In actual condition, many components such as bolt, rivet, link key can all be acted on by shearing force.Institute
So that cutting performance is the very important mechanical performance index of material, is the basis of the various mechanical performance indexs of material.Typical spiral shell
The shearing force that bolt and rivet are subject to is as shown in accompanying drawing 1-4.
In existing test, the method on the shearing performance test of material is limited, and applicable object is single, and method is complicated；
In prior art, from national standard mark《Sell scissor test method》, state is marked as GB/T 13683-92.The program causes
Experimental subjects (experiment pin) bears the shear-type load of double sections, and maximum load when finally recording pin fracture show that shearing is strong
Degree.For the program it is difficult to ensure that pin is broken at two sections simultaneously, the shear strength drawn can distortion.From industry mark
It is accurate《Sheet metal shearing experiment method》, line label is HB 6736-93.Program sample processing difficulties, and sample requirement
Oversized (a certain dimension is more than 100mm), its specimen size figure is as shown in Figure 5.From patent《One kind is used for thin plate
The device of the lower Mechanics Performance Testing of simple shear loading》, Patent No. 201010553215.8.Program applicable object scope compared with
It is small, and shear is complicated, processing difficulties.
In actual processing production, the product of size smaller (three-dimensional dimension or two-dimensional are less than 10mm) is run into sometimes
Or component, the acquired sample that can be used for shearing test will be smaller in this kind of product or component.Moreover, Practical Project
In, it is necessary to a kind of simple and applied widely method determines the cutting performance of material,
People are highly desirable to obtain a kind of excellent single shear performance test for being widely used in minute sample of technique effect
Device.
Utility model content
It is excellent and be widely used in the single shear of minute sample that the purpose of this utility model is to provide a kind of technique effect
Can test device.The utility model can solve the shortcomings that prior art well, and it is especially suitable for the single shear of small yardstick sample
Performance test operates.
The utility model provides a kind of single shear performance testing device for being widely used in minute sample, and its feature exists
In：It is the shear for meeting following requirements：Shear is rigid structure, and it is specially cutting for two centrosymmetric structures
Both even i.e. down cut even 1 and upper shearing even 2 combinations of pairs is cut to form, match the down cut even 1 used and upper shearing occasionally 2 be by
One cylinder material cutting processing forms；The even structure of single shearing is as follows：Be fastenedly connected portion 7, basic courses department 6, coordinate align
Portion 4；Wherein, basic courses department 6 is cylindrical shape, is fastenedly connected portion 7, cooperation aligns axial direction of the portion 4 along basic courses department 6 and is arranged in
Its both ends；It is diametrically partly to split rear remaining half of cylinder perpendicular to certain plane where axis along cylinder that cooperation, which aligns portion 4,
Body structure；Portion 7, basic courses department 6 are fastenedly connected, is coordinated and is aligned the three of portion 4 and be fixedly connected as overall integral structure；Two shearings
Cooperation both when idol is both down cut even 1 and upper shearing even 2 pairing, which aligns portion 4 and is in close contact, make it that two shearings are even common
Form the structure of cylindrical shape；Two even cooperations of shearing align the cuboid run through that axis is provided perpendicular in portion 4
Shape sample cell 5.
The single shear performance testing device for being widely used in minute sample, it is characterised in that：It is tight in shear
The socket part 7 that is connected is provided with screw connection structure；The hardness of shear material therefor is not less than 600HV.
The single shear performance testing device for being widely used in minute sample, it is characterised in that：The width W of sample cell 5
It is that can be determined according to actually detected size in kind with thickness B so that the scope of application of the present utility model greatly increases.One
As in the case of, W=2~20mm, B=1~10mm.
The single shear performance testing device for being widely used in minute sample, it is characterised in that：Shear sample (cut by cooperation
The sample cell 5 of cutting apparatus) be specially cuboid, the width W ' of sample and the thickness B ' of sample than sample cell width W and
The small 0.1mm of thickness B of sample cell, are W '=W-0.1；B '=B-0.1, so that sample is easy to load and unload；It is required that shearing sample
The roughness on product surface is less than 0.8 μm, and the depth of parallelism of apparent surface is less than 20 μm.
In the single shear performance test methods of minute sample, specific shearing manipulation is：Cut under being occasionally by two shearings
Cut even 1 and the portion 7 that is fastenedly connected of upper shearing even 2 distinguish fixed and arranged on electronic universal tester, then cause two shearings
Even cooperation aligns portion 4 and is in close contact, and two even cooperations of shearing should be aligned to the sample cell 5 set in portion 4 and align arrangement；
Then sample is loaded into sample cell 5 so that the intermediate cross-section of sample along its length is just at the even cooperation of two shearings
On the contact surface for aligning portion 4；Then strain rate is set, the pulling force that testing machine is acted on shear is turned by shear
The shearing force acted on sample is turned to, corresponding shearing manipulation is finally carried out in experimental machine and gathers experimental data.
The single shear performance testing device for being widely used in minute sample, it, which is applied, is being widely used in minute sample
Single shear performance test methods in, when carrying out sample shear experiment, gather and handle experimental data, must can finally go to work
Journey shear stress-slip strain curve；The calculation formula of engineering shear stress and slip strain is as follows：
Engineering shear stress：τ=F/ (W ' * B ')
Slip strain：εs=S/B '.
The utility model is to propose one kind on the basis of material shearing experiment correlation technique content in system research to borrow
Help the single shear performance that the operability that special shear is carried out is stronger, the scope of application is wider, technique effect is more excellent to survey
Method for testing, it is particularly suitable for the unworkable minute sample of traditional shearing experiment.
The brief introductions such as the related technical principle of the utility model are as follows：
Simple shear shear deformation is from pure shear evolution of deformation, and this is due to that the condition of pure shear is very harsh, so
Under physical condition, the detrusion of material belongs to simple shear shear deformation mostly.Simple shear shear deformation can resolve into pure shear shear deformation, just
Property rotation and stretching/compressing deformation, as shown in accompanying drawing 6-8, [F] represents strain tensor, γ and γ in figurepSingle shear is represented respectively
Strain and pure shear shear strain, the strain Mohr's circle of three kinds of deformation states represent that a, b, c are represented pure respectively in Fig. 9 as shown in Figure 9
Detrusion state, rigid rotating deformation state and stretching/compressing deformation state.
For sheet metal, three deformation stages can be undergone in single shear process of deformation and failure, are elastic deformation respectively
Stage, plastic period and tear fracture stage, the deformation in these three stages and stress diagram are as shown in figs. 10-12.Elasticity becomes
A small amount of dislocation starts to slide inside shape phase material, and now material is in regime of elastic deformation；In plastic period material
The a large amount of dislocation movements by slip in portion, material slowly stagger at shear surface；In the tear fracture stage, material has born incessantly extraneous shearing
Power, material occurs instantaneously to stagger at shear surface to be broken.
Involved relevant parameter symbol, corresponding term and its numerical value unit such as table 1 in the utility model.
The relevant parameter symbol description of table 1
| Symbol | Term | Unit |
| τ | Shear stress | MPa |
| τm | Shear strength | MPa |
| F | The load that shearing sample is born | N |
| B | The sample slot thickness of shear | mm |
| W | The sample well width of shear | mm |
| B’ | The thickness of shear sample | mm |
| W’ | The width of shear sample | mm |
| L | The length of shear sample | mm |
| S | Displacement of the sample in shear direction | mm |
| εs | The slip strain of shear sample | % |
The utility model relates generally to two aspect contents：The design of shear and the preparation of shear sample.
The design of shear is the selection of device material therefor first, used in the shear involved by the utility model
The requirement of material is：The hardness of shear material therefor is not less than 600HV, that is, during detrusion, shearing
Device is rigid, and without macroscopical elastic deformation, detrusion occurs for the material only determined.Next to that shear adds
Work, using one φ 38 of lathe process cylinder and both ends process screw thread；Then it is high on cylinder edge by the way of wire cutting
The center in degree direction opens one perpendicular to axis and runs through diametric sample cell 5, and sample cell 5 must be with the axis of device
Vertically, and the depth of parallelism of the opposite face of the width of sample cell 5 and thickness opposite face is less than 40 μm；Then will by the way of wire cutting
It is even that cylinder is cut to two equivalent shearings；The contact surface for two shearing idols of finally being polished with sand paper so that its roughness is less than 0.8
μm.The even shape and size of one shearing of obtained shear are as shown in accompanying drawing 13-15.The width of sample cell 5 in accompanying drawing 13-15
The thickness B of degree W and sample cell 5 is adjustable, can specifically be come in embodiment according to the product of reality or the size of component true
The size of random sample product, and then the size of sample cell 5 is determined, interception size it can be adapted on component for oversized component
Sample.So this device can be used for determining the product of various sizes and the cutting performance of component, this allows for this shearing dress
The scope of application is put to be greatly improved.
The shape and size of shear sample are as shown in figure 16, and sample is cuboid.The width W ' and thickness of sample in Figure 16
Spending B ' is matched with the size of the sample cell of shear.During actual experiment, sample is loaded and unloaded for convenience, first according to product
Or the size of component determines the size of sample cell 5, the size of sample is determined further according to the size of sample cell 5.The width W ' of sample
It is smaller 0.1mm than the width W of sample cell 5 and the thickness B of sample cell 5 with the thickness B ' of sample, it is W '=W-0.1；B '=B-
0.1.The length L of sample is adjustable, can determine the length of sample according to the product or component of reality, but the length of sample
It is not less than 8mm, otherwise easy unstability in shear history.The preparation flow of sample and requirement are as follows：Determine what is determined first
Shear surface and shear direction, for cuboid sample of the present utility model, shear surface is the cross section of sample, shear direction
Along thickness of sample direction；Secondly the size of sample is determined according to the size of the sample cell 5 of actual shearing device；Then line is used
The suitable blank material of the mode processing dimension of cutting (blank material leaves certain allowance)；Finally pass through coarse sandpaper and fine sand
Paper is polished (last sand paper used is 2000#) one by one so that four sides of sample along its length do not have wire cutting trace
Mark, the roughness on surface are less than 0.8 μm, and the depth of parallelism of apparent surface is less than 20 μm.
When carrying out shearing experiment, it is only necessary to shear is arranged on any one electronic universal tester, then
Shear sample is fitted into the sample cell 5 of shear so that the upper down cut of shear is occasionally brought into close contact together, is used
The mode of stretching realizes the loading of shearing force, and the pulling force that experimental machine is acted on shear is that shear acts on sample
On shearing force, during shearing experiment, the median plane of whole device cuts open figure and sample stress diagram such as Figure 17, Tu18Suo
Show, reference 1,2,3 represents the sample that down cut idol, upper shearing even summation are sheared respectively in Figure 17.Last set requirement
Strain rate can carry out corresponding shearing experiment.
The utility model devises a kind of workable, excellent simple shear for being widely used in minute sample of technique effect
Performance test methods are cut, the single shear performance test experiment for the minute sample that is particularly suitable for use in.It has that applicability is wide, method letter
Single, easily operated, cost is low, the excellent outstanding feature of technique effect.It can also expand and more be extended on this basis
Using.The utility model has expected more huge economic value and social value.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment is described in further detail to the utility model：
Fig. 1 is counter structure rough schematic of the typical bolt by shearing force；
Fig. 2 is the force analysis figure of corresponding diagram 1；
Fig. 3 is counter structure rough schematic of the typical rivet by shearing force；
Fig. 4 is the force analysis figure of corresponding diagram 3；
Fig. 5 is sheet material single shear sample size figure in professional standard；
Fig. 6 is the deformation state and corresponding strain tensor [F] schematic diagram for the one of which pure shear for belonging to single shear；
Fig. 7 is the deformation state schematic diagram for the one of which rigid rotating for belonging to single shear；
Fig. 8 is deformation state and corresponding strain tensor [F] signal for the one of which stretching/compressing for belonging to single shear
Figure；
Fig. 9 is the corresponding strain Mohr's circle schematic diagram of three kinds of deformation states including of single shear；
Figure 10 is deformation and the stress diagram of one of sheet metal failure by shear three phases " elastic deformation stage "；
Figure 11 is deformation and the stress diagram of two " plastic periods " of sheet metal failure by shear three phases；
Figure 12 is deformation and the stress diagram in three " tear stages " of sheet metal failure by shear three phases；
Figure 13 is the front view of the even shape and size figure of a shearing of shear；
Figure 14 is the left view of the even shape and size figure of a shearing of shear；
Figure 15 is the top view of the even shape and size figure of a shearing of shear；
Figure 16 is shear sample shape and size figure；
Figure 17 is to be cut under sample structure schematic diagram in shear history (the device median plane sectional view that sample is housed) wherein 1 is
Cut idol；2 be that upper shearing is even；3 be sample；
Figure 18 is sample stress diagram in shear history；
Figure 19 is Zr-4 alloys engineering shear stress-slip strain curve；
Figure 20 is Zr-4 alloy shear fracture patterns；
Figure 21 is 2A12 aluminium alloys engineering shear stress-slip strain curve；
Figure 22 is 2A12 aluminium alloy shear fracture patterns；
Figure 23 is TU0 engineerings shear stress-slip strain curve；
Figure 24 is TU0 shear fracture patterns.
Embodiment
Embodiment 1
A kind of single shear performance testing device for being widely used in minute sample, it is the shearing dress for meeting following requirements
Put：Shear is rigid structure, and it is specially the even i.e. down cut even 1 of shearing and the upper shearing even 2 of two centrosymmetric structures
The two combinations of pairs is formed, match the down cut even 1 used and upper shearing even 2 be by a cylinder material cutting processing and
Into；The even structure of single shearing is as follows：Be fastenedly connected portion 7, basic courses department 6, coordinate align portion 4；Wherein, basic courses department 6 is cylinder
Shape, it is fastenedly connected portion 7, cooperation aligns axial direction of the portion 4 along basic courses department 6 and is arranged in its both ends；It is along circle that cooperation, which aligns portion 4,
Column vertical certain plane where axis diametrically partly splits rear remaining half of cylindrical structure；It is fastenedly connected portion 7, basic courses department
6th, cooperation aligns the three of portion 4 and is fixedly connected as overall integral structure；Two shearing idols are down cut even 1 and upper shearing even 2
Cooperation both when the two is matched aligns portion 4 and is in close contact so that the even structure for collectively forming cylindrical shape of two shearings；Two
The even cooperation of individual shearing aligns the cuboid sample cell 5 run through that axis is provided perpendicular in portion 4.
The portion 7 that is fastenedly connected in shear is provided with screw connection structure；The hardness of shear material therefor is not low
In 600HV.
The width W and thickness B of sample cell 5 are can be determined according to actually detected size in kind so that this practicality is new
The scope of application of type greatly increases.Generally, W=2~20mm, B=1~10mm.
Shear sample (sample cell 5 for coordinating shear) is specially cuboid, the width W ' of sample and the thickness of sample
It is smaller 0.1mm than the width W of sample cell and the thickness B of sample cell to spend B ', is W '=W-0.1；B '=B-0.1, so that
Sample is easy to load and unload；It is required that the roughness on shear sample surface is less than 0.8 μm, the depth of parallelism of apparent surface is less than 20 μm.
The single shear performance testing device for being widely used in minute sample is being applied to the single shear performance of minute sample
In method of testing, specific shearing manipulation is：It is that down cut idol 1 and the upper portion 7 that is fastenedly connected for shearing idol 2 divide by two shearing idols
Then other fixed and arranged causes two even cooperations of shearing to align portion 4 and be in close contact on electronic universal tester, and should be by two
The even cooperation of individual shearing aligns the sample cell 5 set in portion 4 and aligns arrangement；Then sample is loaded into sample cell 5 so that sample
Intermediate cross-section along its length is aligned on the contact surface in portion 4 just at two even cooperations of shearing；Then judgement of speed change is set
Rate, the pulling force that testing machine is acted on shear are converted into the shearing force acted on sample by shear, finally existed
Corresponding shearing manipulation is carried out in experimental machine and gathers experimental data.
When carrying out sample shear experiment, gather and handle experimental data, can finally draw engineering shear stress-sliding
Strain curve；The calculation formula of engineering shear stress and slip strain is as follows：
Engineering shear stress：τ=F/ (W ' * B ')
Slip strain：εs=S/B '
The present embodiment be proposed in system research on the basis of material shearing experiment correlation technique content it is a kind of by
In the single shear performance test that the operability of special shear progress is stronger, the scope of application is wider, technique effect is more excellent
Method, it is particularly suitable for the unworkable minute sample of traditional shearing experiment.
The brief introductions such as the related technical principle of the present embodiment are as follows：
Simple shear shear deformation is from pure shear evolution of deformation, and this is due to that the condition of pure shear is very harsh, so
Under physical condition, the detrusion of material belongs to simple shear shear deformation mostly.Simple shear shear deformation can resolve into pure shear shear deformation, just
Property rotation and stretching/compressing deformation, as shown in accompanying drawing 6-8, [F] represents strain tensor, γ and γ in figurepSingle shear is represented respectively
Strain and pure shear shear strain, the strain Mohr's circle of three kinds of deformation states represent that a, b, c are represented pure respectively in Fig. 9 as shown in Figure 9
Detrusion state, rigid rotating deformation state and stretching/compressing deformation state.
For sheet metal, three deformation stages can be undergone in single shear process of deformation and failure, are elastic deformation respectively
Stage, plastic period and tear fracture stage, the deformation in these three stages and stress diagram are as shown in figs. 10-12.Elasticity becomes
A small amount of dislocation starts to slide inside shape phase material, and now material is in regime of elastic deformation；In plastic period material
The a large amount of dislocation movements by slip in portion, material slowly stagger at shear surface；In the tear fracture stage, material has born incessantly extraneous shearing
Power, material occurs instantaneously to stagger at shear surface to be broken.
Involved relevant parameter symbol, corresponding term and its numerical value unit such as table 1 in the present embodiment.
The relevant parameter symbol description of table 1
| Symbol | Term | Unit |
| τ | Shear stress | MPa |
| τm | Shear strength | MPa |
| F | The load that shearing sample is born | N |
| B | The sample slot thickness of shear | mm |
| W | The sample well width of shear | mm |
| B’ | The thickness of shear sample | mm |
| W’ | The width of shear sample | mm |
| L | The length of shear sample | mm |
| S | Displacement of the sample in shear direction | mm |
| εs | The slip strain of shear sample | % |
The present embodiment relates generally to two aspect contents：The design of shear and the preparation of shear sample.
The design of shear is the selection of device material therefor first, material used in the shear involved by the present embodiment
The requirement of material is：The hardness of shear material therefor is not less than 600HV, that is, during detrusion, shearing dress
It is rigid to put, and without macroscopical elastic deformation, detrusion occurs for the material only determined.Next to that the processing of shear,
Using lathe process oneCylinder and both ends process screw thread；Then by the way of wire cutting in cylinder along height side
To center open one perpendicular to axis and run through diametric sample cell 5, sample cell 5 must hang down with the axis of device
Directly, and the depth of parallelism of the opposite face of the width of sample cell 5 and thickness opposite face is less than 40 μm；Then will circle by the way of wire cutting
It is even that post is cut to two equivalent shearings；The contact surface for two shearing idols of finally being polished with sand paper so that its roughness is less than 0.8 μ
m.The even shape and size of one shearing of obtained shear are as shown in accompanying drawing 13-15.The width of sample cell 5 in accompanying drawing 13-15
The thickness B of degree W and sample cell 5 is adjustable, can specifically be come in embodiment according to the product of reality or the size of component true
The size of random sample product, and then the size of sample cell 5 is determined, interception size it can be adapted on component for oversized component
Sample.So this device can be used for determining the product of various sizes and the cutting performance of component, this allows for this shearing dress
The scope of application is put to be greatly improved.
The shape and size of shear sample are as shown in figure 16, and sample is cuboid.The width W ' and thickness of sample in Figure 16
Spending B ' is matched with the size of the sample cell of shear.During actual experiment, sample is loaded and unloaded for convenience, first according to product
Or the size of component determines the size of sample cell 5, the size of sample is determined further according to the size of sample cell 5.The width W ' of sample
It is smaller 0.1mm than the width W of sample cell 5 and the thickness B of sample cell 5 with the thickness B ' of sample, it is W '=W-0.1；B '=B-
0.1.The length L of sample is adjustable, can determine the length of sample according to the product or component of reality, but the length of sample
It is not less than 8mm, otherwise easy unstability in shear history.The preparation flow of sample and requirement are as follows：Determine what is determined first
Shear surface and shear direction, for cuboid sample of the present utility model, shear surface is the cross section of sample, shear direction
Along thickness of sample direction；Secondly the size of sample is determined according to the size of the sample cell 5 of actual shearing device；Then line is used
The suitable blank material of the mode processing dimension of cutting (blank material leaves certain allowance)；Finally pass through coarse sandpaper and fine sand
Paper is polished (last sand paper used is 2000#) one by one so that four sides of sample along its length do not have wire cutting trace
Mark, the roughness on surface are less than 0.8 μm, and the depth of parallelism of apparent surface is less than 20 μm.
When carrying out shearing experiment, it is only necessary to shear is arranged on any one electronic universal tester, then
Shear sample is fitted into the sample cell 5 of shear so that the upper down cut of shear is occasionally brought into close contact together, is used
The mode of stretching realizes the loading of shearing force, and the pulling force that experimental machine is acted on shear is that shear acts on sample
On shearing force, during shearing experiment, the median plane of whole device cuts open figure and sample stress diagram such as Figure 17, Tu18Suo
Show, reference 1,2,3 represents the sample that down cut idol, upper shearing even summation are sheared respectively in Figure 17.Last set requirement
Strain rate can carry out corresponding shearing experiment.
The present embodiment devises a kind of workable, excellent single shear for being widely used in minute sample of technique effect
Performance test methods, the single shear performance test experiment for the minute sample that is particularly suitable for use in.It has applicability wide, and method is simple,
Easily operated, cost is low, the excellent outstanding feature of technique effect.More extension can also be expanded to obtain on this basis should
With.The present embodiment has expected more huge economic value and social value.
Embodiment 2
On the basis of using the single shear performance testing device of minute sample is widely used in described in embodiment 1, carry out
The measure of Zr-4 alloy pipe stock cutting performances：
Zr-4 alloys are that the U.S. develops, and its nominal composition is Zr-1.5Sn-0.2Fe-0.1Cr, and the alloy has
Excellent corrosion resistance, it is widely used in the cladding materials of presurized water reactor and PHWR fuel.
Select H13 steel be used as the material (hardness 620HV) used in shear, according to Figure 13-15 processing shear,
The wherein width W=8mm of sample cell, thickness B=2mm.For Zr-4 alloys, shear sample, the length of sample are processed according to Figure 16
Spend L=20mm, width W '=7.9mm, thickness B '=1.9mm.
The shear processed is arranged on SANS-CMT5205 electronic universal testers, shear sample loads shearing
In the sample cell of device so that the upper down cut of shear is occasionally brought into close contact together, strain rate 0.001s-1(here
Strain rate can be adjusted according to actual requirement, but not exceed 1s-1), then carry out shearing manipulation.According to testing machine
The load-displacement data collected, the data of engineering shear stress-slip strain are calculated by formula, then pass through software
Origin8.0 draws out engineering shear stress-slip strain curve.
The calculation formula of engineering shear stress and slip strain is as follows：
Engineering shear stress：τ=F/ (W ' * B ')
Slip strain：εs=S/B '
Engineering shear stress-slip strain curve of the Zr-4 alloys finally drawn is as shown in Figure 19.With reference to the accompanying drawings 19
Understand, the shear strength (τ of Zr-4 alloysm) it is about 390MPa, slip strain during fracture is about 46%, be that is to say as this Zr-4
Shear fracture is just occurred by about 390MPa shear stress material in alloy.So obtained according to the cutting method of this utility model
Engineering shear stress-slip strain the curve gone out can evaluate the cutting performance of Zr-4 alloys well.
Shear fracture is observed with SEM, shear fracture is more smooth, it may be observed that obvious shearing slip band, is typically to cut
Cut-off port, as shown in Figure 20.
Embodiment 3
On the basis of using the single shear performance testing device of minute sample is widely used in described in embodiment 1, carry out
2A12 aluminum alloy plate materials cutting performance determines：
2A12 aluminium alloys main alloy element is Cu, and the aluminium alloy of this trade mark has good forming property and machining
Performance, various types of products can be obtained, be one of most widely used aluminium alloy.
Determine 2A12 aluminium alloy cutting performances, the same shear selected in embodiment 1,2, shear sample length L=
15mm, width W=7.9mm, thickness B=1.9mm.
The shearing experiment method in embodiment 1,2 is repeated, finally show that engineering shear stress-sliding of 2A12 aluminium alloys should
Varied curve, as shown in Figure 21.21 understand with reference to the accompanying drawings, the shear strength (τ of 2A12 aluminium alloysm) it is about 240MPa, during fracture
Slip strain be about 51%.
Shear fracture is observed with SEM, fracture apperance is typical shear fracture, as shown in Figure 22.
Embodiment 4:
On the basis of using the single shear performance testing device of minute sample is widely used in described in embodiment 1, carry out
TU0 pure copper sheets cutting performance determines：
TU0 pure copper sheets have excellent electric conductivity, are widely used in conductive and sensor component.
Determine the cutting performance of TU0 pure copper sheets, the same shear selected in embodiment 1,2.Shear sample length L=
16mm, width W=7.5mm, thickness B=1.2mm.
The shearing experiment method in embodiment 1,2 is repeated, finally show that engineering shear stress-sliding of TU0 pure copper sheets should
Varied curve, as shown in Figure 23.23 understand with reference to the accompanying drawings, the shear strength (τ of TU0 pure copper sheetsm) it is about 120MPa, during fracture
Slip strain is about 48%.
Shear fracture is observed with SEM, fracture apperance is typical shear fracture, as shown in Figure 24.
In summary the experimental result of embodiment, the single shear performance test methods of the minute sample of the utility model design
The cutting performance of material can be determined well, can provide theoretical foundation well for engineering is actual.
Claims (5)
- A kind of 1. single shear performance testing device for being widely used in minute sample, it is characterised in that：It specifically meets following It is required that shear：Shear is rigid structure, and it is specially the even i.e. down cut idol of shearing of two centrosymmetric structures (1) formed with upper shearing even (2) the two combinations of pairs, it is by a circle to match the down cut even (1) used and upper shearing even (2) Cylindrical material cutting processing forms；The even structure of single shearing is as follows：Be fastenedly connected portion (7), basic courses department (6), coordinate align portion (4)；Wherein, basic courses department (6) is cylindrical shape, is fastenedly connected portion (7), cooperation aligns axial direction of the portion (4) along basic courses department (6) point Its both ends is not arranged in；It is diametrically partly to split rear residue perpendicular to certain plane where axis along cylinder that cooperation, which aligns portion (4), Half of cylindrical structure；Portion (7), basic courses department (6) are fastenedly connected, is coordinated and is aligned portion (4) three and be fixedly connected as overall one Body structure；Two shearing idols are that occasionally (1) and the upper cooperation sheared both when being matched both even (2) align portion (4) tightly to down cut Contiguity, which is touched, causes the even structure for collectively forming cylindrical shape of two shearings；Two even cooperations of shearing are aligned and set in portion (4) There is the cuboid sample cell (5) run through perpendicular to axis.
- 2. according to the single shear performance testing device that minute sample is widely used in described in claim 1, it is characterised in that：Fastening Connecting portion (7) is provided with screw connection structure.
- 3. according to the single shear performance testing device that minute sample is widely used in described in claim 1, it is characterised in that：Sample The width W and thickness B of groove (5) meet following requirements：W=2~20mm, B=1~10mm.
- 4. according to the single shear performance testing device that minute sample is widely used in described in claim 1, it is characterised in that：Shearing Sample is cuboid, and the width W ' of sample and the thickness B ' of sample are smaller than the width W of sample cell and the thickness B of sample cell 0.1mm, it is W '=W-0.1；B '=B-0.1；It is required that the roughness on shear sample surface is less than 0.8 μm, apparent surface's is flat Row degree is less than 20 μm.
- It is 5. described to be widely used according to the single shear performance testing device that minute sample is widely used in described in claim 1 In the single shear performance testing device of minute sample, two shearing idol be down cut even (1) and upper shear being fastenedly connected for idol (2) Portion (7) difference fixed and arranged is on electronic universal tester so that and two even cooperations of shearing align portion (4) close contact, and Two even cooperations of shearing align the sample cell (5) set in portion (4) and align arrangement；Sample is housed so that sample in sample cell (5) The intermediate cross-section of product along its length is aligned on the contact surface of portion (4) just at two even cooperations of shearing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113945457A (en) * | 2021-10-14 | 2022-01-18 | 辽宁科技大学 | Method for analyzing failure mechanism of rock under complex unloading stress condition |
| CN115326549A (en) * | 2022-10-17 | 2022-11-11 | 新亚新智能科技(南通)有限公司 | Testing machine for testing performance of carbon fiber composite material |
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- 2017-03-24 CN CN201720296551.6U patent/CN206787949U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945457A (en) * | 2021-10-14 | 2022-01-18 | 辽宁科技大学 | Method for analyzing failure mechanism of rock under complex unloading stress condition |
| CN115326549A (en) * | 2022-10-17 | 2022-11-11 | 新亚新智能科技(南通)有限公司 | Testing machine for testing performance of carbon fiber composite material |
| CN115326549B (en) * | 2022-10-17 | 2022-12-09 | 新亚新智能科技(南通)有限公司 | Testing machine for testing performance of carbon fiber composite material |
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