CN107228801A - A kind of sheet metal shear outside the plane performance test methods - Google Patents
A kind of sheet metal shear outside the plane performance test methods Download PDFInfo
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- CN107228801A CN107228801A CN201710331514.9A CN201710331514A CN107228801A CN 107228801 A CN107228801 A CN 107228801A CN 201710331514 A CN201710331514 A CN 201710331514A CN 107228801 A CN107228801 A CN 107228801A
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/0025—Shearing
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- Life Sciences & Earth Sciences (AREA)
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- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of sheet metal shear outside the plane performance test methods, by designing shear outside the plane sample, in sheet metal both sides, through-thickness is separated by a certain distance one rectangular channel of each processing, detrusion area is formed between two rectangular channels, the chequered with black and white random speckle of the detrusion area surface spraying of the shear outside the plane sample, so that sheet metal shear outside the plane performance test can be realized.The present invention carries out strain measurement with advanced 3-dimensional digital speckle dynamic strain measurement equipment to detrusion area, obtain the strain during shear outside the plane sample deformation, power displacement curve is converted into shear stress strain curve, shear outside the plane intensity, the mechanical property of shear outside the plane breaking strain of sheet metal is obtained.
Description
Technical field
The present invention relates to a kind of sheet metal shear outside the plane performance test methods, belong to sheet material forming Performance Testing Technology
Field.
Background technology
For energy-saving and emission-reduction, automotive light weight technology turns into our inevitable choice.It is advanced high-strength compared with ordinary low-carbon steel
Hardness of steel is significantly improved, and by reduce thickness can realize body lightening on the premise of automotive safety is met.At present, it is different
The advanced high-strength steel material of intensity rank has been widely used in various body structural members.Advanced high-strength hardness of steel is higher, this
The residual stress for also resulting in its stamping rear part is big, and rebound phenomenon is serious, poor dimensional precision.For decreasing rebound, carry
The forming accuracy of high part, generally uses less curved radius radius when designing mould, and increases in technique pressure-pad-force,
To reduce resilience defect, dimensional accuracy is improved.However, with the reduction of curved radius radius, plate is at punch-die fillet
Position too early phenomenon of rupture easily occurs in forming process.This phenomenon of rupture is with usual in mild steel and low-alloy height
The necking rupture phenomenon that Qiang Gangzhong is observed has an obvious difference, fracture position parallel to die corner at, material before fracture
Not obvious necking phenomenon, incision position is almost thinned without generating material.In a thickness direction, due to fracture direction with
Stretch principal direction of stress angle at 45 °, thus in auto industry circle phenomenological by the early stage under this extended state at curved radius
Fracture mode is referred to as " shear fracture ".
Sheet metal is in preparation process, and rolling mill practice causes the Micro-v oid and Inclusions Along rolling direction quilt of material internal
Elongation, through-thickness flattening, preferable grain orientation formation texture not only result in sheet metal plasticity and are presented obvious each
Anisotropy, it is different with the out-of-plane fracture strength of plate in plate plane to also result in sheet metal, i.e., anisotropy is broken.This
Outside, for the advanced high-strength steel of a class using dual phase steel as representative, martensite island it is main in sheet metal intermediate layer forming core simultaneously
Aggregation, this phenomenon further results in its shear outside the plane intensity different from in-plane shear strength.
In general, sheet metal main load by plate plane in forming process is acted on, perpendicular to plate plane
Normal stress can be ignored, therefore traditional Sheet Metal Forming is generally assumed to be plane stress state.Academia and work
Journey circle obtains sheet metal mechanical property using being tested in face mostly, studies and predict deformation and the failure row of sheet metal
For.However, under small round corner molding condition, the normal stress perpendicular to plate plane is notable, and material is made by complicated shear stress
With, the particularly shear stress outside face, based on the failure behaviour of sheet material and loading in plate plane under conditions of failure behaviour it is obvious
Difference, the now influence of the outer performance of metallic plate face must take into consideration.In order to accurate understanding and predict sheet metal small round corner into
" shear fracture " phenomenon under the conditions of shape, it is necessary to set up the outer performance test methods of metallic plate face, design corresponding sample and folder
Tool.
In the prior art, some existing technologies are that for the thicker high-strength line-pipe steel of thickness, i.e. 15~30mm is thick, passes through
Design " mini pole sample " carries out one way tensile test to obtain the mechanical property of material through-thickness in a thickness direction,
But for the sheet metal of thinner thickness, such as 1~6mm, due to the limitation of thickness, performance test methods outside this face
It can not realize.
The content of the invention
It is an object of the invention to overcome deficiencies of the prior art, for sheet metal, its thickness side is broken through
The shearing sample design of shear outside the plane loading can be realized there is provided a kind of to the limitation of size, and prevents sample detrusion
The jig Design that area rotates, sets up sheet metal shear outside the plane performance test methods.
To achieve the above object, the present invention is realized according to following technical scheme：
A kind of sheet metal shear outside the plane performance test methods, comprise the following steps：
Step S1：It is that length is processed on t sheet metal is the Single Size Rectangular Blanks that H, width are W from thickness；
Step S2：In Single Size Rectangular Blanks side, through-thickness processes width for h1, depth t1=t/2 rectangular channel, rectangle
Trench bottom radius of corner is r, and whole rectangular channel runs through the width of Single Size Rectangular Blanks；
Step S3：In the same way, in the opposite side of Single Size Rectangular Blanks thickness direction, at a distance of offside rectangular channel h2Position
Place is put, width is processed for h3, wherein h3=h1, depth t2=t/2, bottom roundings radius is r another rectangular channel；
Step S4：Shear outside the plane sample forms a length for h between the rectangular channel that two offsides are processed2Shearing
Deformed area.
Step S5：The chequered with black and white random speckle of the detrusion area surface spraying of the shear outside the plane sample；
Step S6：The assembling of shear outside the plane sample and rotation prevention clamp is completed, the general of general cupping machine is held on
Shear outside the plane experiment is carried out on fixture；
Step S7：Strain measurement is carried out to detrusion area with advanced 3-dimensional digital speckle dynamic strain measurement equipment,
The strain during shear outside the plane sample deformation is obtained, is passed throughForce-displacement curve is converted into shear stress-strain bent
Line, wherein F are the shearing force in deformation process, and W is the width of shear outside the plane sample, h2For the length in detrusion area, from cutting
Shear outside the plane intensity, the mechanical property of shear outside the plane breaking strain of sheet metal are obtained in load-deformation curve.
In above-mentioned technical proposal, in the step S3, the detrusion section length h between two rectangular channels2With metallic plate
Ratio between the thickness t of material must is fulfilled for：WhereinThe respectively tensile strength and shear strength of material.
In above-mentioned technical proposal, in the step S6, the rotation prevention clamp includes upper left clamping plate, upper right clamping plate, lower-left
Clamping plate, bottom right clamping plate, wherein the upper left clamping plate and the upper right clamping plate constitute upper fixture, the left side by two tools for bolts ' pretension
Lower plate and the bottom right clamping plate constitute lower clamp by two tools for bolts ' pretension, are subtracted using upper fixture and lower clamp separate structure
The friction of upper fixture, lower clamp and detrusion area during small shear outside the plane sample deformation.
In above-mentioned technical proposal, the upper left clamping plate, the upper right clamping plate, the lower-left clamping plate, the bottom right clamping plate are all
For T-type structure, the upper left clamping plate, the upper right clamping plate, the lower-left clamping plate, the bottom right clamping plate sample holder partial width
It is equal to shear outside the plane specimen width.
In above-mentioned technical proposal, the upper left clamping plate and the bottom right clamping plate have identical structure snd size, the right side
Train wheel bridge and the lower-left clamping plate have identical structure snd size.
In above-mentioned technical proposal, the height h higher than upper left clamping plate of the upper right clamping plate1+h2, the height of the lower-left clamping plate
H higher than bottom right clamping plate2+h3。
The present invention compared with prior art, has the advantages that：
1. the present invention is by designing shear outside the plane sample, in sheet metal both sides, through-thickness, which is separated by a certain distance, respectively adds
One rectangular channel of work, forms detrusion area between two rectangular channels, so as to can realize that sheet metal shear outside the plane performance is surveyed
Examination.Shear outside the plane sample holder is simple to operate in that can carry out stretching experiment on the universal fixturing of general cupping machine.
2. the present invention is by designing rotation prevention clamp, shearing becomes during being prevented effectively from shear outside the plane sample stretching experiment
The rotation in shape area；Upper left clamping plate, upper right clamping plate, lower-left clamping plate, bottom right clamping plate, are both designed as T-type structure, are easy to stretching experiment mistake
The detrusion area of shear outside the plane sample is strained using advanced 3-dimensional digital speckle dynamic strain measurement equipment in journey
Measurement；Rotation prevention clamp uses upper and lower fixture separate structure, it is possible to prevente effectively from upper during shear outside the plane sample deformation,
Friction is produced between lower clamp and detrusion area.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is shear outside the plane sample of the present invention and rotation prevention clamp assembling structure schematic diagram；
Fig. 2 is shear outside the plane specimen size schematic diagram of the present invention；
Fig. 3 is upper left clamping plate schematic diagram of the present invention；
Fig. 4 is upper right clamping plate schematic diagram of the present invention；
Fig. 5 is lower-left clamping plate schematic diagram of the present invention；
Fig. 6 is bottom right clamping plate schematic diagram of the present invention；
In figure, reference is：1- shear outside the plane samples；2- upper lefts clamping plate；3- upper right clamping plates；4- lower-lefts clamping plate；5- is right
Lower plate；6- bolts；7- nuts.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.
Fig. 1 is shear outside the plane sample of the present invention and rotation prevention clamp assembling structure schematic diagram；Fig. 2 is shear outside the plane of the present invention
Specimen size schematic diagram；Fig. 3-6 is each clamping plate schematic diagram of the invention；As shown in figs 1 to 6, a kind of metallic plate face of the invention
Outer shearing performance test method, comprises the following steps：
Step S1：It is that length is processed on t sheet metal is the Single Size Rectangular Blanks that H, width are W from thickness；
Step S2：In Single Size Rectangular Blanks side, through-thickness processes width for h1, depth t1=t/2 rectangular channel, rectangle
Trench bottom radius of corner is r, and whole rectangular channel runs through the width of Single Size Rectangular Blanks；
Step S3：In the same way, in the opposite side of Single Size Rectangular Blanks thickness direction, at a distance of offside rectangular channel h2Position
Place is put, width is processed for h3, wherein h3=h1, depth t2=t/2, bottom roundings radius is r another rectangular channel；
Step S4：Shear outside the plane sample forms a length for h between the rectangular channel that two offsides are processed2Shearing
Deformed area.
Step S5：The chequered with black and white random speckle of the detrusion area surface spraying of the shear outside the plane sample；
Step S6：The assembling of shear outside the plane sample and rotation prevention clamp is completed, the general of general cupping machine is held on
Shear outside the plane experiment is carried out on fixture；
Step S7：Strain measurement is carried out to detrusion area with advanced 3-dimensional digital speckle dynamic strain measurement equipment,
The strain during shear outside the plane sample deformation is obtained, is passed throughForce-displacement curve is converted into shear stress-strain bent
Line, wherein F are the shearing force in deformation process, and W is the width of shear outside the plane sample, h2For the length in detrusion area, from cutting
Shear outside the plane intensity, the mechanical property of shear outside the plane breaking strain of sheet metal are obtained in load-deformation curve.
In above-mentioned technical proposal, in the step S3, the detrusion section length h between two rectangular channels2With metallic plate
Ratio between the thickness t of material must is fulfilled for：WhereinThe respectively tensile strength and shear strength of material.
Rotation prevention clamp includes upper left clamping plate 2, upper right clamping plate 3, lower-left clamping plate 4, bottom right clamping plate 5, the wherein He of upper left clamping plate 2
Upper right clamping plate 3 is located at the upside rectangular channel arranged on left and right sides of shear outside the plane sample 1 respectively, by being pressed from both sides on two pretension of bolt 6 compositions
Tool, lower-left clamping plate 4 and bottom right clamping plate 5 are located at the downside rectangular channel arranged on left and right sides of shear outside the plane sample 1 respectively, pass through two bolts 6
Pretension constitutes lower clamp, after the completion of shear outside the plane sample 1 is assembled with rotation prevention clamp, and upper right clamping plate 3, lower-left clamping plate 4 divide just
Not Bao Fu the detrusion area left and right side of shear outside the plane sample 1, occur to turn so as to limit during stretching experiment detrusion area
It is dynamic.Shear outside the plane sample 1 is during detrusion, and upper fixture is slided with the top half of shear outside the plane sample 1 without relative, so that
Friction is avoided to produce；Lower clamp, without relative slip, is produced with the latter half of shear outside the plane sample 1 so as to avoid rubbing.
As shown in Fig. 2 it is that W, thickness are t that the length of shear outside the plane sample 1, which is L, width, in the both sides of shear outside the plane sample 1
Through-thickness processes the rectangular channel of an identical size, groove width h respectively1=h3, groove depth t1=t/2, rectangle trench bottom circle
Angular radius r, two rectangular channels are at a distance of h2, wherein h2=t/2, forms a length for h between two rectangular channels2Shearing
Deformed area.
As shown in figures 3 to 6, upper left clamping plate 2, upper right clamping plate 3, the lower-left clamping plate 4, bottom right clamping plate 5 are all T-type structure,
It is easy to use shearing of the advanced 3-dimensional digital speckle dynamic strain measurement equipment to shear outside the plane sample during stretching experiment
Deformed area carries out strain measurement.Upper left clamping plate 2, upper right clamping plate 3, lower-left clamping plate 4, the sample holder partial width of bottom right clamping plate 5 are equal
Equal to shear outside the plane specimen width, width is W.Upper left clamping plate 2, the height of lower-left clamping plate 4 are h4, upper right clamping plate 3, bottom right
The height of clamping plate 5 is respectively h4+h1+h2, h4+h2+h3.Upper left clamping plate and bottom right clamping plate have identical structure snd size, upper right
Clamping plate and lower-left clamping plate have identical structure snd size.
The height of upper right clamping plate 3 is than the high h of upper left clamping plate 31+h2, the height of lower-left clamping plate 4 is than the high h of bottom right clamping plate 52+h3。
Embodiment result shows that shear outside the plane sample and rotation prevention clamp of the present invention can realize sheet metal shear outside the plane
Performance test, obtains shear outside the plane intensity, the shear outside the plane breaking strain of shear outside the plane load-deformation curve and sheet metal
Etc. mechanical property, so that further deeply understand deformation and fracture mechanism of the sheet metal outside face under loading environment, it is accurate pre-
Survey " shear fracture " phenomenon of sheet metal under small round corner molding condition.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (6)
1. a kind of sheet metal shear outside the plane performance test methods, it is characterised in that comprise the following steps：
Step S1：It is that length is processed on t sheet metal is the Single Size Rectangular Blanks that H, width are W from thickness；
Step S2：In Single Size Rectangular Blanks side, through-thickness processes width for h1, depth t1=t/2 rectangular channel, rectangular channel bottom
Portion's radius of corner is r, and whole rectangular channel runs through the width of Single Size Rectangular Blanks；
Step S3：In the same way, in the opposite side of Single Size Rectangular Blanks thickness direction, at a distance of offside rectangular channel h2Position at,
Width is processed for h3, wherein h3=h1, depth t2=t/2, bottom roundings radius is r another rectangular channel；
Step S4：Shear outside the plane sample forms a length for h between the rectangular channel that two offsides are processed2Detrusion
Area.
Step S5：The chequered with black and white random speckle of the detrusion area surface spraying of the shear outside the plane sample；
Step S6：The assembling of shear outside the plane sample and rotation prevention clamp is completed, the universal fixturing of general cupping machine is held on
Upper progress shear outside the plane experiment；
Step S7：Strain measurement is carried out to detrusion area with advanced 3-dimensional digital speckle dynamic strain measurement equipment, obtained
Strain during shear outside the plane sample deformation, passes throughForce-displacement curve is converted into shear stress-strain curve,
Wherein F is the shearing force in deformation process, and W is the width of shear outside the plane sample, h2For the length in detrusion area, answered from cutting
Shear outside the plane intensity, the mechanical property of shear outside the plane breaking strain of sheet metal are obtained in force-strain curve.
2. a kind of sheet metal shear outside the plane performance test methods according to claim 1, it is characterised in that the step
In S3, the detrusion section length h between two rectangular channels2Ratio between the thickness t of sheet metal must is fulfilled for：WhereinThe respectively tensile strength and shear strength of material.
3. a kind of sheet metal shear outside the plane performance test methods according to claim 1, it is characterised in that the step
In S6, the rotation prevention clamp include upper left clamping plate, upper right clamping plate, lower-left clamping plate, bottom right clamping plate, wherein the upper left clamping plate and
The upper right clamping plate constitutes upper fixture by two tools for bolts ' pretension, and the lower-left clamping plate and the bottom right clamping plate pass through two bolts
Pretension constitutes lower clamp, using upper fixture and lower clamp separate structure reduce upper fixture during shear outside the plane sample deformation,
Lower clamp and the friction in detrusion area.
4. a kind of sheet metal shear outside the plane performance test methods according to claim 3, it is characterised in that the upper left
Clamping plate, the upper right clamping plate, the lower-left clamping plate, the bottom right clamping plate are all T-type structure, the upper left clamping plate, the upper right
Clamping plate, the lower-left clamping plate, the bottom right clamping plate sample holder partial width are equal to shear outside the plane specimen width.
5. a kind of sheet metal shear outside the plane performance test methods according to claim 4, it is characterised in that the upper left
Clamping plate and the bottom right clamping plate have identical structure snd size, and the upper right clamping plate and the lower-left clamping plate have identical knot
Structure and size.
6. a kind of sheet metal shear outside the plane performance test methods according to claim 5, it is characterised in that the upper right
The height of clamping plate h higher than upper left clamping plate1+h2, the height h higher than bottom right clamping plate of the lower-left clamping plate2+h3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710331514.9A CN107228801B (en) | 2017-05-11 | 2017-05-11 | Method for testing out-of-plane shearing performance of metal plate |
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|---|---|---|---|
| CN201710331514.9A CN107228801B (en) | 2017-05-11 | 2017-05-11 | Method for testing out-of-plane shearing performance of metal plate |
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| CN107228801B CN107228801B (en) | 2020-01-07 |
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Cited By (7)
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| CN109374435A (en) * | 2018-09-12 | 2019-02-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of shear at high temperature test method |
| CN109916686A (en) * | 2019-04-04 | 2019-06-21 | 上海交通大学 | A kind of test sample of the anisotropy breaking strength of sheet metal |
| CN110567802A (en) * | 2019-10-11 | 2019-12-13 | 江苏越科新材料有限公司 | Core material shearing sample bonding tool clamp |
| CN111965047A (en) * | 2020-07-07 | 2020-11-20 | 南京航空航天大学 | Composite material interlaminar shear testing device and operation method thereof |
| CN114047061A (en) * | 2021-09-03 | 2022-02-15 | 北京理工大学 | Sample suitable for testing in-situ tensile shear performance of explosive welding interface |
| CN114112574A (en) * | 2021-11-15 | 2022-03-01 | 哈尔滨工业大学（威海） | Magnetron sputtering forming device for testing mechanical property of mesoscopic scale bending sample |
| CN115597985A (en) * | 2022-12-06 | 2023-01-13 | 国高材高分子材料产业创新中心有限公司（Cn） | Direct shearing performance testing method based on DIC technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374435A (en) * | 2018-09-12 | 2019-02-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of shear at high temperature test method |
| CN109916686A (en) * | 2019-04-04 | 2019-06-21 | 上海交通大学 | A kind of test sample of the anisotropy breaking strength of sheet metal |
| CN110567802A (en) * | 2019-10-11 | 2019-12-13 | 江苏越科新材料有限公司 | Core material shearing sample bonding tool clamp |
| CN111965047A (en) * | 2020-07-07 | 2020-11-20 | 南京航空航天大学 | Composite material interlaminar shear testing device and operation method thereof |
| CN114047061A (en) * | 2021-09-03 | 2022-02-15 | 北京理工大学 | Sample suitable for testing in-situ tensile shear performance of explosive welding interface |
| CN114112574A (en) * | 2021-11-15 | 2022-03-01 | 哈尔滨工业大学（威海） | Magnetron sputtering forming device for testing mechanical property of mesoscopic scale bending sample |
| CN115597985A (en) * | 2022-12-06 | 2023-01-13 | 国高材高分子材料产业创新中心有限公司（Cn） | Direct shearing performance testing method based on DIC technology |
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| CN107228801B (en) | 2020-01-07 |
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