CN107271273A - A kind of method that cross tensile pre-deformation loading determines yield surface - Google Patents
A kind of method that cross tensile pre-deformation loading determines yield surface Download PDFInfo
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- CN107271273A CN107271273A CN201710312003.2A CN201710312003A CN107271273A CN 107271273 A CN107271273 A CN 107271273A CN 201710312003 A CN201710312003 A CN 201710312003A CN 107271273 A CN107271273 A CN 107271273A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0272—Cruciform specimens
Abstract
The invention discloses the method that a kind of loading of cross tensile pre-deformation determines yield surface, its content mainly includes the measure of initial yield surface and subsequent yield surface, and the load path for redrawing deformation using other direction after a direction pre-tension deformation determines yield surface.Initial yield surface is determined, and the different stress points for being stretched to selection along the direction of cross tensile sample one first keep load, then are stretched to fracture in another direction, and initial yield surface is drawn according to gained yield strength value；Subsequent yield surface is determined, the pre-stretching point of selection is stretched to along cross tensile sample rolling direction first, it is offloaded to zero or is unloaded to the different stress points of selection, then select next step load mode according to different unloading manners, obtains corresponding yield strength value and draw subsequent yield surface.The inventive method can reflect the Evolution of yield surface in sheet material Biaxial stress well, be capable of the anisotropy mechanical behavior of Efficient Characterization Plastic Deformation of Metal Materials.
Description
Technical field
The invention belongs to material mechanics experiment yield surface determination techniques field, and in particular to a kind of cross tensile pre-deformation adds
Carry the method for determining yield surface, this method is particularly suitable for use in the measure of metallic sheet stock yield surface.
Background technology
Metal material has many problems to be related to plasticity theory in engineer applied, and metal sheet forming process is just
It is a kind of plastic deformation behavior, in order to predict forming process exactly and improve forming technology, it is necessary to build accurate this structure mould
Type characterizes plastic history.However, the surrender, plastic flow and strengthening effect during Plastic Deformation of Metal Materials can be adopted
Studied with the evolution of yield surface, the Evolution of yield surface is the Important Theoretic Foundation for building constitutive model.
Numerous studies show that load path of the sheet metal in forming process is often a kind of disproportional path, and it should
Power state is multiaxis, complexity.At present, the Experiments of Machanics for sheet material generally sample uniaxial loading and twin shaft along different directions
Proportional loading, the actual forced status that these load modes can not reflect in Sheet Metal Forming well, in description metal material
There is the error that can not ignore in forming process under material multiaxis, complex stress condition, it is impossible to meet the need of its actual forming process
Want, especially the metal material with strong anisotropy behavior, such as magnesium alloy, titanium alloy.In summary, it is existing to bend
The face assay method of clothes can not characterize the anisotropy of metal material well.
The content of the invention
For above-mentioned problem, the present invention is intended to provide a kind of loading of cross tensile pre-deformation determines the side of yield surface
Method, this method can reflect the Evolution of yield surface in sheet material Biaxial stress well, being capable of the modeling of Efficient Characterization metal material
Property deformation anisotropy mechanical behavior.
In order to solve above-mentioned technical problem, technical scheme is as follows：
A kind of method that cross tensile pre-deformation loading determines yield surface, this method uses another after a direction pre-tension deformation
The load path that one direction redraws deformation determines yield surface, and its particular content comprises the following steps：
(1) rolling direction uniaxial tension sample, horizontal uniaxial tension sample are prepared respectively in plate rolling direction and laterally
With cross tensile sample；
(2) take rolling direction uniaxial tension sample to carry out simple tension loading, determine corresponding rolling direction tensile stress-
Strain curve；Take horizontal uniaxial tension sample to carry out simple tension loading, determine corresponding lateral tensile stress-strain curve；
Obtain corresponding yield strength value；
(3) according to the rolling direction tensile stress-strain curve determined in step (2), arbitrarily chosen in Hookean region
Several stress points, using the corresponding stress value of each stress point as abscissa, take number and selected stress point points identical
Cross tensile sample, each cross tensile sample is first stretched to the stress value of selection along rolling direction respectively, keeps load, then along horizontal stroke
To stretching until fracture, measures corresponding tensile yield strength values as ordinate；
(4) according to the lateral tensile stress-strain curve determined in step (2), arbitrarily choose some in Hookean region
Individual stress point, using the corresponding stress value of each stress point as ordinate, takes number and selected stress point points identical cross
Tensile sample, each cross tensile sample is first transversely stretched to the stress value of selection respectively, keeps load, then draw along rolling direction
Stretch to fracture, measure corresponding tensile yield strength values as abscissa；
(5) initial yield surface is drawn out according to the coordinate points determined in step (3) and (4)；
(6) according to the rolling direction tensile stress-strain curve determined in step (2), one is chosen respectively in the plastic stage
Stress point takes a rolling direction uniaxial tension sample, the pre-stretching point for being stretched to selection is unloaded again first as pre-stretching point
To zero, the load-deformation curve of rolling direction uninstall process is measured；Then a cross tensile sample is taken, first along rolling direction
It is stretched to pre-stretching point and is unloaded to zero again, then transversely simple tension is loaded, measures first along rolling direction pre-stretching again along horizontal stroke
To the load-deformation curve of stretching, corresponding yield strength value is obtained；
(7) according to the load-deformation curve for the rolling direction uninstall process measured in step (6), appoint in Hookean region
Meaning chooses several stress points, using the stress value corresponding to each stress point as abscissa, takes number to be counted with selected stress point
Identical cross tensile sample, each cross tensile sample is first stretched to pre-stretching point along rolling direction respectively and then is unloaded to selection
Stress value, keep load, then transversely stretching until fracture, measure corresponding tensile yield strength values as ordinate；
(8) load-deformation curve transversely stretched again according to being first pre-stretched in step (6) along rolling direction, in elasticity
Several stress points are arbitrarily chosen in region, the stress value corresponding to each stress point takes number and selected stress as ordinate
Point points identical cross tensile sample, each cross tensile sample is first stretched to pre-stretching point along rolling direction respectively and is unloaded to again
Zero, the stress point of selection is then transversely stretched to, load is kept, then loaded along rolling direction until fracture, is measured corresponding
Tensile yield strength values are used as abscissa；
(9) subsequent yield surface is drawn out according to the coordinate points determined in step (7) and (8).
Due to using above-mentioned technical proposal, a kind of cross tensile pre-deformation loading that the present invention is provided determines the side of yield surface
Method, compared with prior art with such beneficial effect：
(1) existing cross stretching experiment is overcome the limitation of plastic work done face proportional loading mode such as to determine there is provided one
Plant the method that the loading of cross tensile pre-deformation determines yield surface；
(2) the inventive method can reflect the yield surface Evolution of sheet material multi-shaft stretching well, be particularly suitable for use in
Metal material with stronger anisotropy mechanical behavior.
The inventive method can reflect the Evolution of yield surface in sheet material Biaxial stress well, being capable of Efficient Characterization gold
Belong to the anisotropy mechanical behavior of material plasticity deformation.
Brief description of the drawings
Fig. 1 is cross sample schematic diagram；
Fig. 2 is yield surface schematic diagram；
Fig. 3 is initial yield surface load path；
Fig. 4 is subsequent yield surface load path.
In Fig. 2,1- initial yield surfaces, 2- subsequent yield surfaces, Y1、Y2、Y3、Y4、Y5、Y6、Y7、Y8- initial yield areal coordinate
Point, Y9、Y10、Y11、Y12、Y13、Y14- subsequent yield surface coordinate points, the tensile stress point that A, B, C, D, E, F, G, H, I, J- choose,
M- is pre-stretched point, and RD- rolling directions, TD- is horizontal.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
Determine the method for yield surface to determine metal material yield surface with a kind of cross tensile pre-deformation loading of the present invention,
As shown in Fig. 2 mainly including the measure of initial yield surface 1 and subsequent yield surface 2.If σRD、σTDRespectively sheet metal rolling side
To (hereinafter referred to as RD directions) and horizontal (hereinafter referred to as TD directions) tensile yield strength, this method step is as follows：
Step 1：Two RD directions uniaxial tension samples are prepared along sheet material RD directions, a TD side is prepared along sheet material TD directions
To uniaxial tension sample；11 cross tensile samples as shown in Figure 1 are prepared according to experiment condition and material；
Step 2：Uniaxial tension sample prepared by a RD direction and uniaxial tension examination prepared by a TD direction are taken respectively
Sample carries out simple tension loading, measures RD directions tensile stress-strain curve and TD directions tensile stress-strain curve, according to
Curve determines the tensile yield strength values σ of both directionRDAnd σTD, with σRD0 is taken to obtain Y for abscissa ordinate1Point coordinates, with
σTD0 is taken to obtain Y for ordinate abscissa2Point coordinates, i.e. Y1、Y2Coordinate be (σRD, 0) and (0, σTD)；Stretched according to RD directions
Load-deformation curve and TD directions measure tensile stress-strain curve arbitrarily chosen in corresponding Hookean region several should
A, B, C point are chosen on force, RD directions, stress value is followed successively byD, E, F point, stress are chosen on TD directions
Value is followed successively by
Step 3：3 cross prepared tensile samples are taken, cross tensile sample is loaded into RD directions in step 2 respectively selects
Stress point A, B, the C taken, keeps load, is then loaded along TD directions until fracture, measures corresponding load-deformation curve and determine
Go out the yield strength in each point TD directionsWithThen Y3、Y4And Y5Coordinate be
With
Step 4：3 cross prepared tensile samples are taken, cross tensile sample is loaded into TD directions in step 2 respectively selects
Stress point D, E, the F taken, keeps load, is then loaded along RD directions until fracture, measures corresponding load-deformation curve and determine
Go out the yield strength in each point RD directionsWithThen Y6、Y7And Y8Coordinate be
With
Step 5：The Y that will be measured in step 2,3 and 41、Y2、Y3、Y4、Y5、Y6、Y7、Y8The coordinate of point is in stress coordinate system
Draw out initial yield surface as shown in Figure 3；
Step 6：One stress point M conducts are chosen in the plastic stage according to the tensile stress-strain curve in RD directions in step 2
Point is pre-stretched, its respective value isY9Coordinate beTake a RD directions uniaxial tension sample, tensile loads
Zero is unloaded to again to the pre-stretching point chosen, the load-deformation curve of uninstall process is measured, and is then chosen in online Hookean region
Stress point G, H, corresponding stress value are followed successively byWith
Step 7：A cross tensile sample is taken, the pre-stretching point M chosen in step 6 is first loaded into along RD directions unloads again
To zero, then the loading of TD directions, measures corresponding load-deformation curve and determines its yield strengthY10Coordinate beAccording to the TD directions load-deformation curve measured, stress point I, J are chosen in Hookean region, stress value is followed successively by
Step 8：Two cross tensile samples are taken first to be loaded into pre-stretching the point M, Ran Houfen chosen in step 6 along RD directions
G, H point are not unloaded to, load is kept, then are loaded along TD directions until fracture, measures corresponding load-deformation curve and determine each
The yield strength of pointWithThen Y11、Y12Coordinate beWith
Step 9：Two cross tensile samples are taken, the pre-stretching point M chosen in step 6 is loaded into along RD directions first and unloads again
Zero is downloaded to, stress point I, the J chosen in step 7 is then loaded onto along TD directions respectively, load is kept, then stretch directly along RD directions
To being broken, measure load-deformation curve and determine corresponding yield strengthThen Y13、Y14Coordinate beWith
Step 10：Coordinate according to being measured in step 6,7,8,9 draws out subsequent yield surface as shown in Figure 4, so far complete
Into measure metal material yield surface.
Claims (1)
1. a kind of method that cross tensile pre-deformation loading determines yield surface, this method uses another after a direction pre-tension deformation
The load path that direction redraws deformation determines yield surface, it is characterised in that：This method particular content comprises the following steps：
(1) rolling direction uniaxial tension sample, horizontal uniaxial tension sample and ten are prepared respectively in plate rolling direction and laterally
Word tensile sample；
(2) take rolling direction uniaxial tension sample to carry out simple tension loading, determine corresponding rolling direction tensile stress-strain
Curve；Take horizontal uniaxial tension sample to carry out simple tension loading, determine corresponding lateral tensile stress-strain curve；Obtain
Corresponding yield strength value；
(3) according to the rolling direction tensile stress-strain curve determined in step (2), arbitrarily choose some in Hookean region
Individual stress point, using the corresponding stress value of each stress point as abscissa, takes number and selected stress point points identical cross
Tensile sample, each cross tensile sample is first stretched to the stress value of selection along rolling direction respectively, keeps load, then transversely draw
Stretch to fracture, measure corresponding tensile yield strength values as ordinate；
(4) according to the lateral tensile stress-strain curve determined in step (2), several are arbitrarily chosen in Hookean region should
Force, using the corresponding stress value of each stress point as ordinate, takes number to be stretched with selected stress point points identical cross
Sample, each cross tensile sample is first transversely stretched to the stress value of selection respectively, keeps load, then stretch directly along rolling direction
To being broken, corresponding tensile yield strength values are measured as abscissa；
(5) initial yield surface is drawn out according to the coordinate points determined in step (3) and (4)；
(6) according to the rolling direction tensile stress-strain curve determined in step (2), a stress is chosen respectively in the plastic stage
Point takes a rolling direction uniaxial tension sample, the pre-stretching point for being stretched to selection is unloaded to zero again first as pre-stretching point,
Measure the load-deformation curve of rolling direction uninstall process；Then a cross tensile sample is taken, is first stretched to along rolling direction
Pre-stretching point is unloaded to zero again, and then transversely simple tension is loaded, and measures and is first transversely stretched again along rolling direction pre-stretching
Load-deformation curve, obtain corresponding yield strength value；
(7) according to the load-deformation curve for the rolling direction uninstall process measured in step (6), arbitrarily selected in Hookean region
Several stress points are taken, using the stress value corresponding to each stress point as abscissa, take number identical with selected stress point points
Cross tensile sample, each cross tensile sample respectively first along rolling direction is stretched to pre-stretching point then be unloaded to selection should
Force value, keeps load, then transversely stretching, up to fracture, measures corresponding tensile yield strength values as ordinate；
(8) load-deformation curve transversely stretched again according to being first pre-stretched in step (6) along rolling direction, in Hookean region
Several stress points are inside arbitrarily chosen, the stress value corresponding to each stress point takes number and selected stress point point as ordinate
Number identical cross tensile sample, each cross tensile sample is first stretched to pre-stretching point along rolling direction respectively and is unloaded to zero again,
Then the stress point of selection is transversely stretched to, load is kept, then loaded along rolling direction until fracture, measures corresponding stretching
Yield strength value is used as abscissa；
(9) subsequent yield surface is drawn out according to the coordinate points determined in step (7) and (8).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220781A (en) * | 2019-06-06 | 2019-09-10 | 燕山大学 | A kind of plate anisotropy constitutive parameter scaling method and system |
| CN112033795A (en) * | 2020-09-22 | 2020-12-04 | 南京奇纳金属材料科技有限公司 | Biaxial tensile fatigue test piece optimization design method with oblique welding seam |
| CN112903446A (en) * | 2021-02-03 | 2021-06-04 | 广西大学 | Method for measuring subsequent yield of metal material under tension-torsion combined preloading |
| WO2022167992A1 (en) * | 2021-02-05 | 2022-08-11 | Estl N.V. | Testing film with impurities |
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| CN106610357A (en) * | 2016-12-02 | 2017-05-03 | 燕山大学 | Method for measuring yield surface of metal material |
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| CN106610357A (en) * | 2016-12-02 | 2017-05-03 | 燕山大学 | Method for measuring yield surface of metal material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220781A (en) * | 2019-06-06 | 2019-09-10 | 燕山大学 | A kind of plate anisotropy constitutive parameter scaling method and system |
| CN110220781B (en) * | 2019-06-06 | 2020-05-08 | 燕山大学 | Method and system for calibrating anisotropic constitutive parameters of plates |
| CN112033795A (en) * | 2020-09-22 | 2020-12-04 | 南京奇纳金属材料科技有限公司 | Biaxial tensile fatigue test piece optimization design method with oblique welding seam |
| CN112033795B (en) * | 2020-09-22 | 2023-11-10 | 南京奇纳金属材料科技有限公司 | Biaxial stretching fatigue test piece optimization design method with oblique welding seam |
| CN112903446A (en) * | 2021-02-03 | 2021-06-04 | 广西大学 | Method for measuring subsequent yield of metal material under tension-torsion combined preloading |
| WO2022167992A1 (en) * | 2021-02-05 | 2022-08-11 | Estl N.V. | Testing film with impurities |
| BE1029083B1 (en) * | 2021-02-05 | 2022-09-05 | Estl N V | Testing foil with impurities |
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