CN109632462A - A kind of material constitutive test method under complex stress condition - Google Patents
A kind of material constitutive test method under complex stress condition Download PDFInfo
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- CN109632462A CN109632462A CN201910021424.9A CN201910021424A CN109632462A CN 109632462 A CN109632462 A CN 109632462A CN 201910021424 A CN201910021424 A CN 201910021424A CN 109632462 A CN109632462 A CN 109632462A
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- sample
- stress condition
- complex stress
- test
- temperature
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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
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/18—Performing tests at high or low temperatures
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N3/26—Investigating twisting or coiling properties
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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
- G01N2203/0019—Compressive
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to materials processing technology field, it is related to the test method of material constitutive and mechanical property under a kind of complex stress condition.The invention aims to the material constitutive accurately tested under complex stress condition and mechanical properties, to further investigate material property and application value, and to simulate the material processing technique to provide theoretical direction for actual production process.Implementation method specifically includes that three axis hydraulic devices of design, setup test material are installed on test platform and fixed, and preheating, all around load provides complex stress condition up and down, records data, and analyzing and processing data obtains this structure curve.Material constitutive test method under complex stress condition proposed by the present invention is by increasing the hydraulic cylinder on other two axis on original uniaxial tensile test machine, so that the complex stress condition of sample is directly provided, to improve the efficiency and accuracy of test.
Description
Technical field
The present invention relates to a kind of stress-strain test experimental provisions, are a kind of material constitutives under complex stress condition
The test method of relationship.
Background technique
An important factor for constitutive relation of material refers to the strain-stress relation of material, is characterization material mechanical performance,
Decisive role is played in the simulation process of material processing.Material constitutive relation measurement it is accurate whether, not only affect material
Expect performance evaluation, also directly affect material processing simulation accuracy, thus determine a kind of material application and
Development.Material constitutive relation generally by universal testing machine measure, i.e., by sample holder universal testing machine up and down two folder
Between head, pulling force or pressure, and the measurement strain of the foil gauge by being attached to specimen surface are applied to material by collet, finally
By calculating and processing obtains a load-deformation curve, and the measurement for material constitutive under complex stress condition, then it is logical
Equivalent stress or equivalent strain are crossed to substitute, and in practical engineering applications, the practical Service Environment of material is often more complex,
Often under Multiaxial stress effect, and practical mechanical property is also influenced by factors such as temperature, therefore traditional is uniaxially stretched
Test can not reflect mechanical property of the material under complex stress condition completely, can not establish accurate constitutive relation；Cross
Though tension test method can intuitively reflect the biaxial stress state of material, for some complex parts or it is in specific temperature
Material under environment, also can not Accurate Prediction forming defect and material constitutive relation.Therefore, it is in for how research is tested
The mechanical property of material under complex stress condition is particularly significant.
Summary of the invention
The purpose of the present invention is to provide a kind of Measurement of Material Mechanical Performance methods under complex stress and temperature environment, lead to
The optimization design to material mechanical performance test device is crossed, realizes the material power under different temperatures environment and under complex stress condition
Learn the test of performance and the foundation of constitutive equation.
To reach above-mentioned technical goal, the present invention is realized using following technical scheme:
There is hydraulic cylinder in only one direction of Normal hydraulic universal testing machine, can only be uniaxially stretched or compression test,
Material complex stress high temperature experiment porch proposed by the present invention is added in existing Normal hydraulic universal testing machine structure
Dress all around has three groups of hydraulic cylinders altogether up and down, while providing the hydraulic coupling of six direction above and below all around, and in hydraulic cylinder
Outer installation high-temperature cabinet, hot environment is realized by heating, by programed temperature, the setting of Lai Shixian different temperatures, thus
Mechanical property and constitutive relation of the simulation material under different temperatures and complex stress condition.
Due to the design of above-mentioned technical proposal, the present invention has the following advantages compared with prior art:
This material complex stress high temperature experiment porch controls three groups of hydraulic cylinders by control platform and all around moves up and down
Multi-load is applied to sample, provides different temperatures environment by high-temperature cabinet.
(1) it can be adapted for the different materials including metal, for example, concrete, plastics etc., improve application field
And use scope.
(2) complex stress and various temperature environments can be provided, more fitting actual production working environment, so that test knot
Fruit is more acurrate and has referential.
(3) the various stresses of material can be only realized by an equipment, such as: it stretches, compression, bending, torsion.
(4) mechanical property that can test anisotropy and the material under complex stress condition, it is accurate to establish material
Constitutive relation.
Detailed description of the invention
Material constitutive test method schematic diagram is as shown in Figure 1 under complex stress condition.1,2,3 upper and lower, left and right is respectively indicated
With three groups of front and back hydraulic cylinder, sample is applied with down respectively, left and right and in the front-back direction stretch and compressive deformation, three groups of hydraulic cylinders
It can act on simultaneously and the material mechanical performance and material constitutive under complex stress condition are simulated with this.
Specific embodiment
It is illustrated by the material two under 100 DEG C of environment to compression, for simple tension.The specific implementation steps are as follows:
(1) collet is opened, sample holder is fixed simultaneously on three groups of collets, by programed temperature, by high-temperature cabinet
Temperature is heated to 100 DEG C.
(2) when operating temperature reaches requirement temperature, by controlling the movement of hydraulic cylinder transmission shaft, make upper and lower and front and back
The hydraulic cylinder while compression movement of both direction, give sample to provide pressure, when pressure value reaches required value, its are made to stop fortune
It is dynamic, keep pressure value constant.
(3) transmission shaft for controlling left and right both direction starts extensional motion, provides pulling force to sample, constantly stretches in sample
During long, value of thrust is continuously increased, collect data, obtain one under the conditions of 100 DEG C, two to be pressurized, simple tension
Load-deformation curve, i.e. constitutive equation.
(4) it until obvious constriction or fracture occurs in sample, turns off the switch, hydraulic cylinder stop motion, opens collet and take out
Sample, off-test.
Points for attention
(1) present invention need to clamp sample three-dimensional, therefore the specimen shape tested cannot be common " dumbbell shape " sample,
It needs to redesign, can be rectangular or other shapes.
(2) present invention is that other two groups of hydraulic cylinders are increased on the basis of Normal hydraulic universal testing machine, and device form needs
Do corresponding improvement.
(3) it is the setting for realizing varying environment temperature, a high-temperature cabinet need to be separately added outside testing machine, thus accurate control ring
Border temperature.
Claims (2)
1. a kind of test method for the material constitutive relation under complex stress condition is specifically completed according to the following steps:
(1) collet is opened, sample holder is fixed simultaneously on three groups of collets, by programed temperature, by high-temperature cabinet temperature
It is heated to 100 DEG C；
(2) when operating temperature reaches requirement temperature, by control hydraulic cylinder transmission shaft movement, make up and down and former and later two
The hydraulic cylinder while compression movement in direction, providing pressure to sample makes its stop motion when pressure value reaches required value, protects
It is constant to hold pressure value；
(3) transmission shaft for controlling left and right both direction starts extensional motion, and sample is given to provide pulling force, constantly extends in sample, draws
During force value is continuously increased, collect data, obtain one under the conditions of 100 DEG C, two to be pressurized, the stress-of simple tension
Strain curve, i.e. constitutive equation；
(4) it until obvious constriction or fracture occurs in sample, turns off the switch, hydraulic cylinder stop motion, opens collet and take out sample,
Off-test.
2. the test method of material constitutive under a kind of complex stress condition according to claim 1, it is characterised in that: step
(1) high-temperature cabinet in outside sample provides the environment of a high temperature to measure this structure of material under the condition of high temperature；Front and back up and down
Left and right has been respectively mounted hydraulic cylinder, and complicated answer can be provided to sample by the aggregate motion of three dimension six direction hydraulic cylinders
Power state, thus material constitutive of the test sample under complex stress condition.
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| CN201910021424.9A CN109632462A (en) | 2019-01-10 | 2019-01-10 | A kind of material constitutive test method under complex stress condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113420391A (en) * | 2021-07-02 | 2021-09-21 | 北京理工大学重庆创新中心 | Method for obtaining high-precision hardening model parameters of material under complex stress state |
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| CN102645375A (en) * | 2012-04-24 | 2012-08-22 | 哈尔滨工业大学 | Material mechanical property testing method under three-dimensional stress state |
| CN103674712A (en) * | 2013-12-11 | 2014-03-26 | 北京理工大学 | High-strength steel complex stress testing platform |
| CN205103104U (en) * | 2015-11-13 | 2016-03-23 | 西安建筑科技大学 | High temperature high pressure rock triaxial apparatus |
| CN107153032A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | The compressive strength of rock test system and method for a kind of controllable temperature |
| CN107941625A (en) * | 2017-12-13 | 2018-04-20 | 中国科学院武汉岩土力学研究所 | Rock full rigidity true triaxial system and deep rock mass temperature stress coupled simulation system |
| CN108827794A (en) * | 2018-06-25 | 2018-11-16 | 中南大学 | A kind of true triaxial hot test furnace, pilot system and method |
-
2019
- 2019-01-10 CN CN201910021424.9A patent/CN109632462A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645375A (en) * | 2012-04-24 | 2012-08-22 | 哈尔滨工业大学 | Material mechanical property testing method under three-dimensional stress state |
| CN103674712A (en) * | 2013-12-11 | 2014-03-26 | 北京理工大学 | High-strength steel complex stress testing platform |
| CN205103104U (en) * | 2015-11-13 | 2016-03-23 | 西安建筑科技大学 | High temperature high pressure rock triaxial apparatus |
| CN107153032A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | The compressive strength of rock test system and method for a kind of controllable temperature |
| CN107941625A (en) * | 2017-12-13 | 2018-04-20 | 中国科学院武汉岩土力学研究所 | Rock full rigidity true triaxial system and deep rock mass temperature stress coupled simulation system |
| CN108827794A (en) * | 2018-06-25 | 2018-11-16 | 中南大学 | A kind of true triaxial hot test furnace, pilot system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113420391A (en) * | 2021-07-02 | 2021-09-21 | 北京理工大学重庆创新中心 | Method for obtaining high-precision hardening model parameters of material under complex stress state |
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