CN107727505A - A kind of plane strain extension (PSE) method - Google Patents

A kind of plane strain extension (PSE) method Download PDF

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Publication number
CN107727505A
CN107727505A CN201710833193.2A CN201710833193A CN107727505A CN 107727505 A CN107727505 A CN 107727505A CN 201710833193 A CN201710833193 A CN 201710833193A CN 107727505 A CN107727505 A CN 107727505A
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CN
China
Prior art keywords
sample
experiment
plane strain
pse
strain
Prior art date
Application number
CN201710833193.2A
Other languages
Chinese (zh)
Inventor
祝洪川
周少云
魏星
陈寅
葛锐
余立
陈明
陈勇
潘立波
Original Assignee
武汉钢铁有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉钢铁有限公司 filed Critical 武汉钢铁有限公司
Priority to CN201710833193.2A priority Critical patent/CN107727505A/en
Publication of CN107727505A publication Critical patent/CN107727505A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0017Tensile
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/026Specifications of the specimen
    • G01N2203/0262Shape of the specimen
    • G01N2203/0278Thin specimens
    • G01N2203/0282Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes

Abstract

The invention discloses a kind of plane strain extension (PSE) method, including:Step 1: experiment is made by pipe sample with metal sheet using technologies such as laser weldings.Step 2: by pipe sample both ends plug good seal, wherein one end plug center is provided with fuel feed hole, fuel feed hole connection external hydraulic system.Step 3: sample is clamped on cupping machine using special grasping system, Axial extensometer is loaded onto.Step 4: carrying out tension test using draw speed V, the data of pulling force sensor and extensometer are recorded during experiment.Step 5: stopping experiment after specimen broke and exporting the stress-strain diagram of material, the tension test under plane strain stress state is completed.The present invention can obtain the stress-strain diagram under the material strain paths, provide measured performance data for the foundation of steel sheet material model, simultaneously can be used for crystallized ability of the assessment material under plane strain state.

Description

A kind of plane strain extension (PSE) method
Technical field
The present invention relates to a kind of material performance test method of metal sheet, and in particular to a kind of plane strain extension (PSE) Method, belong to material properties test technical field.
Background technology
The material properties test of metal sheet is constantly subjected to widely pay attention to, and its mechanics is compared with forming property method of testing Much more in other metal materials, main performance test methods have stretching test method(Test including n values and r values)、 Hole expansion test method, AEG-process method, ear test method processed, Limit Drawing test method, shaping limit curve test method With rebound test method etc., except stretching test method can obtain material under simple tension state in these test methods Outside constitutive relationship of stress-strain, other test methods mainly carry out test assessment in terms of the crystallized ability of material, for building The constitutive relationship of stress-strain of vertical material is without effect.
In the practical application of thin metal foil, if it is possible to which establishing accurate material constitutive relation model then can be more preferable Ground meets numerical simulation requirements of one's work, greatly improves the reliability of design analysis.Because one directional tensile test represent just material A kind of load path of material, it is that not enough sufficiently hydraulic bulge test solves material etc. in the actual application of material The test of constitutive relationship of stress-strain under biaxial tension stress state, material stress-strain model under plane strain state Need to be tested using wide plate stretching or cross stretching, but the enforcement difficulty of wide plate stretching and cross stretching is higher, and recipient The accuracy of load-deformation curve is also unsatisfactory obtained by the limitation of method.
Existing plane strain extension (PSE) method mainly has wide plate stretching and cross stretching.Wide plate stretching is a kind of approximate Plane strain extension (PSE) method, the wider closer plane strain tension state of sample, but the survey of clamping and the strain of sample It is higher to measure difficulty, it is also high to the tonnage demand of testing machine.Cross stretching is a more suitable variable strain regime stretching examination Proved recipe method, available for from simple tension to the test for waiting the differently strained path status such as biaxial tension, but cross tensile sample Prepare it is cumbersome, and stress and strain be also difficult to it is accurate corresponding.
The content of the invention
The present invention is in view of the deficiency of existing sheet metal plane loading method of testing, it is proposed that a kind of based on the flat of pipe stretching Face strained tensile test method, this method can overcome to a certain extent existing plane strain extension (PSE) method some not Foot part.
What the present invention was realized in:
A kind of plane strain extension (PSE) method, including:
Step 1: experiment is made into pipe sample with metal sheet using technologies such as laser weldings, the length of pipe is L, internal diameter For 2R, sample thickness t;
Step 2: pipe sample both ends are used into plug good seal of the radius for R, wherein one end plug center is provided with fuel feed hole, Fuel feed hole connects external hydraulic system;
Step 3: sample is clamped on cupping machine using special grasping system, Axial extensometer is loaded onto;
Step 4: carrying out tension test using draw speed V, the data of pulling force sensor and extensometer are recorded during experiment, Hydraulic system is supplemented oil mass inside pipe sample according to draw speed simultaneously, and supplement speed is π R2V, hydraulic system Maximum cannot be below (t/R) σ to oil pressurem, σmFor the tensile strength of material;
Step 5: stop experiment after specimen broke and export the load-deformation curve of material, the drawing under plane strain stress state Experiment is stretched to complete.
Further scheme is:
, it is necessary to which sample and grasping system are isolated using guard box in step 3, hydraulic pressure oil seepage or specimen broke are prevented Injury caused by oil leak afterwards.
Metal sheet is prepared into certain diameter and the pipe of length by the present invention first(Laser welding can be used), then will Tube ends are blocked with cylinder, wherein the perforate of one end cylindrical center and are connected external hydraulic system, are passed through special circular tube clip Tool held circular pipe sample carries out tension test behind both ends, and the hydraulic system pressure certain to offer inside sample is protected during experiment Sample internal diameter is held not shrink in drawing process(Considering, safety problem needs sample and grasping system to be carried out during experiment Closing protection), material is obtained with plane strain shape by the extensometer on the pulling force sensor and sample of jockey Stress and strain data under state.
Tensile property of the sheet metal under plane strain stress state can be entered using the plane strain extension (PSE) method Row test, so as to obtain the load-deformation curve under the material strain paths, the foundation for steel sheet material model provides actual measurement Performance data, it simultaneously can be used for crystallized ability of the assessment material under plane strain state.
Brief description of the drawings
Fig. 1 is the plane strain extension (PSE) schematic diagram of the embodiment of the present invention.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
The present invention main embodiment be:
The preparation of plane strain extension (PSE) hydraulic system, grasping system and accessory;
The processing of test pipe tensile sample;
The Control & data acquisition of plane strain extension (PSE) process;
The processing of test data and outcome evaluation.
More specific description is as follows:
A kind of plane strain extension (PSE) method, including:
Step 1: experiment is made into pipe sample 1 with metal sheet using technologies such as laser weldings, the length of pipe is L, internal diameter For 2R, sample thickness t;
Step 2: pipe sample both ends are used into plug good seal of the radius for R, wherein one end plug 2 is plug not with holes, separately One end plug is plug 3 with holes, and center is provided with fuel feed hole, fuel feed hole connection external hydraulic system 6;
Step 3: sample is clamped on cupping machine using special grasping system 5, load onto Axial extensometer 4, it is necessary to Sample and grasping system are isolated using guard box, prevent injury caused by oil leak after hydraulic pressure oil seepage or specimen broke;
Step 4: carrying out tension test using draw speed V, the data of pulling force sensor and extensometer are recorded during experiment, Hydraulic system is supplemented oil mass inside pipe sample according to draw speed simultaneously, and supplement speed is π R2V, hydraulic system Maximum cannot be below (t/R) σ to oil pressurem, σmFor the tensile strength of material;
Step 5: stop experiment after specimen broke and export the load-deformation curve of material, the drawing under plane strain stress state Experiment is stretched to complete.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair Bright preferable embodiment, embodiments of the present invention are simultaneously not restricted to the described embodiments, it should be appreciated that people in the art Member can be designed that a lot of other modifications and embodiment, and these modifications and embodiment will fall in principle disclosed in the present application Within scope and spirit.

Claims (3)

  1. A kind of 1. plane strain extension (PSE) method, it is characterised in that including:
    Step 1: experiment is made into pipe sample with metal sheet, the length of pipe is L, internal diameter 2R, sample thickness t;
    Step 2: pipe sample both ends are used into plug good seal of the radius for R, wherein one end plug center is provided with fuel feed hole, Fuel feed hole connects external hydraulic system;
    Step 3: sample is clamped on cupping machine using special grasping system, Axial extensometer is loaded onto;
    Step 4: carrying out tension test using draw speed V, the data of pulling force sensor and extensometer are recorded during experiment, Hydraulic system is supplemented oil mass inside pipe sample according to draw speed simultaneously, and supplement speed is π R2V, hydraulic system Maximum cannot be below (t/R) σ to oil pressurem, σmFor the tensile strength of material;
    Step 5: stop experiment after specimen broke and export the load-deformation curve of material, the drawing under plane strain stress state Experiment is stretched to complete.
  2. 2. plane strain extension (PSE) method according to claim 1, it is characterised in that:
    In step 3, sample and grasping system are isolated using guard box, leaked after preventing hydraulic pressure oil seepage or specimen broke Injury caused by oil.
  3. 3. plane strain extension (PSE) method according to claim 1, it is characterised in that:
    It is that experiment is made by pipe sample with metal sheet by laser welding technology in step 1.
CN201710833193.2A 2017-09-15 2017-09-15 A kind of plane strain extension (PSE) method CN107727505A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
CN107727505A true CN107727505A (en) 2018-02-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109107393A (en) * 2018-11-07 2019-01-01 温州莲华环保科技有限公司 A kind of forward osmosis membrane performance test apparatus and its test method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201609731U (en) * 2009-12-25 2010-10-20 中国科学院金属研究所 Simple pipe hydraulic bulging device
CN103033421A (en) * 2012-12-28 2013-04-10 哈尔滨工业大学 Bulging experiment device for directly testing mechanical property of pipe
CN103267689A (en) * 2013-05-07 2013-08-28 桂林电子科技大学 Pipe hydrobulging forming limit diagram construction method and test apparatus
CN104007017A (en) * 2014-05-23 2014-08-27 北京理工大学 Metal pipe stretching device
CN105300802A (en) * 2015-10-20 2016-02-03 哈尔滨工业大学 Bidirectional stress state stress-strain measurement device and method for thin-walled tube
CN106018119A (en) * 2016-07-18 2016-10-12 西安交通大学 Stretching stress testing machine used in high-temperature and high-pressure hydrogen environment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201609731U (en) * 2009-12-25 2010-10-20 中国科学院金属研究所 Simple pipe hydraulic bulging device
CN103033421A (en) * 2012-12-28 2013-04-10 哈尔滨工业大学 Bulging experiment device for directly testing mechanical property of pipe
CN103267689A (en) * 2013-05-07 2013-08-28 桂林电子科技大学 Pipe hydrobulging forming limit diagram construction method and test apparatus
CN104007017A (en) * 2014-05-23 2014-08-27 北京理工大学 Metal pipe stretching device
CN105300802A (en) * 2015-10-20 2016-02-03 哈尔滨工业大学 Bidirectional stress state stress-strain measurement device and method for thin-walled tube
CN106018119A (en) * 2016-07-18 2016-10-12 西安交通大学 Stretching stress testing machine used in high-temperature and high-pressure hydrogen environment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109107393A (en) * 2018-11-07 2019-01-01 温州莲华环保科技有限公司 A kind of forward osmosis membrane performance test apparatus and its test method

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