CN109765123A - Utilize the method for pure bending measuring plate Bauschinger effect - Google Patents
Utilize the method for pure bending measuring plate Bauschinger effect Download PDFInfo
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- CN109765123A CN109765123A CN201910099644.3A CN201910099644A CN109765123A CN 109765123 A CN109765123 A CN 109765123A CN 201910099644 A CN201910099644 A CN 201910099644A CN 109765123 A CN109765123 A CN 109765123A
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Abstract
The invention discloses a kind of methods using pure bending measuring plate Bauschinger effect, comprising steps of sheet material to be measured sample is installed in plate pure bending device, carry out pure bending to plate；Sheet material measurement is bent yield point, and records this yield point position；Another sheet material to be measured sample is replaced, pure bending experiment is carried out to plate, record the bending curvature of sample in experimentation and is applied to the moment of flexure of sample；Bauschinger effect curve is obtained according to the data of record.Positive bending and back-flexing can be carried out to plate, obtain the Bauschinger effect figure of plate；The Bauschinger ring that one-way circulation load obtains plate can also be carried out to plate.Material bending performance can be more accurately described by the data that pure bending experiment obtains, is more nearly really using the mechanical property tests data that pure bending measurement Bauschinger effect obtains compared to tensile compression test, influence factor is less, and parameter is more accurate.
Description
Technical field
The present invention relates to a kind of plate property measuring technology more particularly to a kind of utilization pure bending measuring plate Bao Xin
The method of lattice effect.
Background technique
A large amount of experiment and studies have shown that for metal material, the material model obtained by crooked experiment is in itself
The true mechanical property of material can more be embodied.This is because the mechanical property that is shown in stretching experiment of material by
The influence of several factors, such as strain rate, the defect etc. of material therein, and the crooked experiment by carrying out material, then
It can be good at solving these problems.And it can more accurately reflect the true mechanical property of metal material.
Especially plate needs to carry out alternating bending during roll forming, and pure bending can be recycled significantly and be added
Load and Opposite side loading, very close roll forming technical process.And when load it is uneven when, pure bending be not in constriction,
The geometry deformations such as buckling.Pure bending does not introduce shear direction and lateral load, so that testing of materials is more smart than stretching experiment
Really.
Summary of the invention
The object of the present invention is to provide a kind of methods using pure bending measuring plate Bauschinger effect.
The purpose of the present invention is what is be achieved through the following technical solutions:
Method using pure bending measuring plate Bauschinger effect of the invention, comprising steps of
A, sheet material to be measured sample is installed in plate pure bending device, pure bending is carried out to plate；
B, sheet material measurement is bent yield point, and records this yield point position；
C, another sheet material to be measured sample is replaced, pure bending experiment is carried out to plate, sample is curved in record experimentation
Curvature and the moment of flexure for being applied to sample；
D, Bauschinger effect curve is obtained according to the data of record.
As seen from the above technical solution provided by the invention, provided in an embodiment of the present invention to be surveyed using pure bending experiment
The method of fixed board material Bauschinger effect can more accurately describe material bending by the data that pure bending experiment obtains
Energy.It is more nearly really using the mechanical property tests data that pure bending measurement Bauschinger effect obtains compared to tensile compression test, shadow
The factor of sound is less, and parameter is more accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that equipment therefor is tested in pure bending in the embodiment of the present invention；
Fig. 2 is CYCLIC LOADING Bauschinger ring schematic diagram in the embodiment of the present invention；
Fig. 3 is positive load Opposite side loading Bauschinger effect schematic diagram in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention will be described in further detail below.What is be not described in detail in the embodiment of the present invention is interior
Appearance belongs to the prior art well known to professional and technical personnel in the field.
Method using pure bending measuring plate Bauschinger effect of the invention, preferable specific embodiment
It is:
Comprising steps of
A, sheet material to be measured sample is installed in plate pure bending device, pure bending is carried out to plate；
B, sheet material measurement is bent yield point, and records this yield point position；
C, another sheet material to be measured sample is replaced, pure bending experiment is carried out to plate, sample is curved in record experimentation
Curvature and the moment of flexure for being applied to sample；
D, Bauschinger effect curve is obtained according to the data of record.
Preferred method one:
In the step C, positive bending and back-flexing are carried out to plate, bending must not exceed bending yield point every time；
In the step D, moment of flexure and curvature are converted into the stress strain diagram of sample, this figure i.e. plate Bauschinger thus
Effect figure.
In the step C, if there is plastic deformation in forward direction bending, when carrying out back-flexing, sample is no longer pure
Bending, then data are unavailable.
Preferred method two:
In the step C, unidirectional load is carried out to plate and is then unloaded, reloads and unloads again；
In the step D, curvature and moment of flexure are converted into strain and stress, obtain stress-strain diagram, curve uninstalling portion
Divide and reload part and form a closed area, this closed area is then Bauschinger ring.
In the step D, curve unloading part with reload part be two curves not being overlapped, Origin And Destination
It is connected to form a closed area, this closed area is known as Bauschinger ring, and the size of the Bauschinger ring passes through its width
It is measured with area.
Above-mentioned pure bending device can make 180 ° of pure bending of sample progress forward and reverse.
Method using pure bending measuring plate Bauschinger effect of the invention, in view of the superior of pure bending experiment
Property, material bending performance can more accurately be described by the data that pure bending experiment obtains.Bao Xin is measured using pure bending
The mechanical property tests data that lattice effect obtains are more nearly really compared to tensile compression test, and influence factor is less, and parameter is more smart
Really.
Relative to other bend tests, the advantages of pure bending, can be summarized as follows:
1, pure bending does not introduce shear stress and transverse load, while the constant test for making material anti-bending strength of moment of flexure is more
Add accurate, the i.e. pure bending mechanical performance parameter and failure mode that are conducive to calculate material；
2, in actual test, pure bending can directly apply (significantly) circulation or reversed load, this is three-point bending
It cannot achieve with stretching；
3, when applying uneven load pure bending be not in geometry unstability such as: constriction, buckling etc.；
4, pure bending does not introduce local deformation such as impression etc., reduces the influence of localized contact stress；
5, the effective coverage of the limitation of pure bending not test sample geometry and testing section, observation and measurement is wider.
Specific embodiment one:
Utilize the method for pure bending measuring plate Bauschinger effect, comprising the following steps:
1) sheet coupon to be measured is installed in plate pure bending device；
2) sheet material measurement is bent yield point, and records this yield point position；
3) another sheet material to be measured sample is replaced, positive bending and back-flexing are carried out to plate, must not be bent surpass every time
Bending yield point is crossed, bending curvature is recorded in experimentation and is applied to the moment of flexure of sample；
4) moment of flexure and curvature are converted into the stress strain diagram of sample, this figure i.e. plate Bauschinger effect figure thus, such as
Shown in Fig. 3.
Specific embodiment two:
Utilize the method for pure bending measuring plate Bauschinger effect, comprising the following steps:
1) sheet coupon to be measured is installed in plate pure bending device；
2) sheet material measurement is bent yield point, and records this yield point position；
3) another sheet material to be measured sample is replaced, unidirectional load is carried out to plate and is then unloaded, reloads and unloads again, record
The curvature and moment of flexure of sample in experimentation；
4) curvature and moment of flexure are converted into strain and stress, obtain stress-strain diagram；
5) curve unloading part forms a closed area with part is reloaded, this closed area is then Bauschinger ring
As shown in Figure 2.
As shown in Figure 1, for pure bending device used in specific embodiment, but the present invention is not relying on the device, Ke Yiyong
Other any devices for being able to achieve pure bending.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention utilizes pure bending measuring plate Bauschinger effect, using pure bending device, can carry out just to sample
To load and Opposite side loading, repeated loading and unloading can also be carried out.
A large amount of experiment and studies have shown that for metal material, the material model obtained by crooked experiment is in itself
The true mechanical property of material can more be embodied.This is because the mechanical property that is shown in stretching experiment of material by
The influence of several factors, such as strain rate, the defect etc. of material therein.And the crooked experiment by carrying out material, then
It can be good at solving these problems.And it can more accurately reflect the true mechanical property of metal material.
In actual production, the Bauschinger effect obtained is tested using pure bending, and finite element numerical simulation can be improved
The rebound of plate in process can be more accurately predicted in accuracy, improve processing quality, and then reduce loss, realize
Green manufacturing, it is energy saving.
Experimentation of the present invention is simple, and the pure bending device utilized can be 180 ° by material bending, can obtain larger answer
Mechanical property under becoming, experimental factors are few, and obtained data are accurate.
In conclusion the present invention is measured the experiment of plate Bauschinger effect using pure bending equipment to plate.Plate
Sample experienced pure bending-unloading-pure bending and the reversed pure bending of pure bending-unloading-in the same direction respectively, produce Bauschinger
Effect.The Bauschinger effect obtained using the present invention, can be improved the accuracy of finite element numerical simulation, can be more accurately pre-
The rebound of drafting board material in process improves processing quality, and then reduces loss, realizes green manufacturing, energy saving.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (6)
1. a kind of method using pure bending measuring plate Bauschinger effect, which is characterized in that comprising steps of
A, sheet material to be measured sample is installed in plate pure bending device, pure bending is carried out to plate；
B, sheet material measurement is bent yield point, and records this yield point position；
C, another sheet material to be measured sample is replaced, pure bending experiment is carried out to plate, the bending for recording sample in experimentation is bent
Rate and the moment of flexure for being applied to sample；
D, Bauschinger effect curve is obtained according to the data of record.
2. the method according to claim 1 using pure bending measuring plate Bauschinger effect, it is characterised in that:
In the step C, positive bending and back-flexing are carried out to plate, bending must not exceed bending yield point every time；
In the step D, moment of flexure and curvature are converted into the stress strain diagram of sample, this figure i.e. plate Bauschinger effect thus
Figure.
3. the method according to claim 2 using pure bending measuring plate Bauschinger effect, which is characterized in that institute
It states in step C, if there is plastic deformation in forward direction bending, when carrying out back-flexing, sample is no longer pure bending, then counts
According to unavailable.
4. the method according to claim 1 using pure bending measuring plate Bauschinger effect, it is characterised in that:
In the step C, unidirectional load is carried out to plate and is then unloaded, reloads and unloads again；
In the step D, curvature and moment of flexure are converted into strain and stress, obtain stress-strain diagram, curve unloading part and
It reloads part and forms a closed area, this closed area is then Bauschinger ring.
5. the method according to claim 4 using pure bending measuring plate Bauschinger effect, which is characterized in that institute
State in step D, curve unloading part with reload part be two curves not being overlapped, Origin And Destination is connected to form
One closed area, this closed area are known as Bauschinger ring, and the size of the Bauschinger ring is weighed by its width with area
Amount.
6. the method according to any one of claims 1 to 5 using pure bending measuring plate Bauschinger effect, special
Sign is that the pure bending device can make 180 ° of pure bending of sample progress forward and reverse.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811406617 | 2018-11-23 | ||
| CN2018114066178 | 2018-11-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916736A (en) * | 2018-11-23 | 2019-06-21 | 北方工业大学 | The device and method of plate pure bending repeatedly |
| CN114509335A (en) * | 2020-11-16 | 2022-05-17 | 中国石油天然气集团有限公司 | Method for detecting Bauschinger effect value of steel plate for welded pipe |
| CN114563366A (en) * | 2019-09-29 | 2022-05-31 | 迈克医疗电子有限公司 | High-concentration sample identification method, device and detection system |
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| CN203164064U (en) * | 2013-03-21 | 2013-08-28 | 深圳万测试验设备有限公司 | Bending tester |
| CN103308396A (en) * | 2013-06-17 | 2013-09-18 | 上海交通大学 | Bending test device for thin plate and slender rod |
| CN104316414A (en) * | 2014-10-24 | 2015-01-28 | 陕西天财工程造价咨询有限公司 | Overturning plate type bending device |
| CN108181184A (en) * | 2017-11-28 | 2018-06-19 | 中铝材料应用研究院有限公司 | A kind of evaluating apparatus and application method of sheet metal buckling performance |
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2019
- 2019-01-31 CN CN201910099644.3A patent/CN109765123A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203164064U (en) * | 2013-03-21 | 2013-08-28 | 深圳万测试验设备有限公司 | Bending tester |
| CN103308396A (en) * | 2013-06-17 | 2013-09-18 | 上海交通大学 | Bending test device for thin plate and slender rod |
| CN104316414A (en) * | 2014-10-24 | 2015-01-28 | 陕西天财工程造价咨询有限公司 | Overturning plate type bending device |
| CN108181184A (en) * | 2017-11-28 | 2018-06-19 | 中铝材料应用研究院有限公司 | A kind of evaluating apparatus and application method of sheet metal buckling performance |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916736A (en) * | 2018-11-23 | 2019-06-21 | 北方工业大学 | The device and method of plate pure bending repeatedly |
| CN114563366A (en) * | 2019-09-29 | 2022-05-31 | 迈克医疗电子有限公司 | High-concentration sample identification method, device and detection system |
| CN114563366B (en) * | 2019-09-29 | 2023-09-01 | 迈克医疗电子有限公司 | High-concentration sample identification method, device and detection system |
| CN114509335A (en) * | 2020-11-16 | 2022-05-17 | 中国石油天然气集团有限公司 | Method for detecting Bauschinger effect value of steel plate for welded pipe |
| CN114509335B (en) * | 2020-11-16 | 2024-04-30 | 中国石油天然气集团有限公司 | Method for detecting Bactger effect value of steel plate for welded pipe |
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