CN107860656A - A kind of two-way strain failure performance experimental rig of hull structural steel and method - Google Patents
A kind of two-way strain failure performance experimental rig of hull structural steel and method Download PDFInfo
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- CN107860656A CN107860656A CN201711037845.8A CN201711037845A CN107860656A CN 107860656 A CN107860656 A CN 107860656A CN 201711037845 A CN201711037845 A CN 201711037845A CN 107860656 A CN107860656 A CN 107860656A
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- test specimen
- top board
- experimental rig
- structural steel
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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
-
- 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
Abstract
The present invention provides a kind of two-way strain failure performance experimental rig of hull structural steel, including：Hemispherical punch, top board, lower cavity die, fastening bolt；Experiment test specimen is placed on experimental rig；The top board is flange-type, and circular hole is opened at center, and circular hole size should be slightly bigger than hemispherical punch diameter；Circular hole is opened at the lower cavity die center, and circular hole size should be slightly bigger than punch diameter, and hole upper limb has rounding；The experiment test specimen is fixed on by fastening bolt to be drilled between the top board and lower cavity die of circle screw, and top board one side is extruded by a hemispherical punch.The present invention also proposes a kind of method of testing materials for studying hull structural steel material failure performance under two-way strain regime, failure strain or stress value of the steel under the conditions of Different Plane strain ratio can be obtained by carrying out the testing of materials, further draw out the limit shaping figure of structural material, the i.e. relation of strain ratio and material failure.
Description
Technical field
The invention belongs to the mechanical property test technical field of marine metal material, more particularly to hull structural steel is two-way
Material failure testing program under strain regime.
Background technology
In Naval Architecture and Ocean Engineering use operation process, Ship Structure is normally under composite stress state, such as：
Is there is complexity by Ship Structure in the pressure effect of complexity, ship collision, stranded problem under sail in submarine pressure hull
Stress state etc..The country is based primarily upon simple tension examination for the specification mark that the conventional mechanical property of marine metal material is tested
Proved recipe method, obtain the mechanical properties such as Tensile strength, yield strength, elongation and the contraction percentage of area.Pass through simple tension
Experiment is difficult to determine the relation between material failure and material strain ratio.In order to accurately study complex plane strain regime pontoon
The failure performance of the failure properties of structural material, especially anisotropic material such as high-strength steel sheet, composite etc. is, it is necessary to borrow
Biaxial tensile test method is helped to provide investigative technique means.
The biaxial tensile test being currently known generally has hydraulic bulge test, draw down test, cruciform specimen biaxial tension
Experiment etc..Wherein cruciform specimen biaxial tensile test is more directly perceived, and can complete the biaxial tension under different proportion load path
Experiment, but test apparatus requires higher；Hydraulic bulge test will use highly pressurised liquid, and experimental condition is harsh and can only realize double
Drawn to waiting；It is single that draw down test equally exists loading form, it is difficult to obtains the material forming limit under the conditions of more strain ratioes.
For the material failure test method under Ship Structure Steel material complex strain state, it is necessary to propose that a kind of experiment is set
Easy, the differently strained biaxial tensile test method than loading is applied, improves the efficiency of the two-way strain failure test research of material
Meanwhile reduce experimentation cost.
The content of the invention
It is an object of the invention to lack efficiently to study the examination of two-way strain regime material property for hull structural steel
Proved recipe method, propose that one kind can realize that material test specimen is differently strained than loading, and the material that experimental condition is easier to meet is two-way
Tension test.
To solve the above problems, the present invention provides a kind of two-way strain failure performance experimental rig of hull structural steel, including：
Hemispherical punch, top board, lower cavity die, fastening bolt；Experiment test specimen is placed on experimental rig；
The top board is flange-type, and circular hole is opened at center, and circular hole size should be slightly bigger than hemispherical punch diameter；
Circular hole is opened at the lower cavity die center, and circular hole size should be slightly bigger than punch diameter, and hole upper limb has rounding；
The experiment test specimen is fixed on by fastening bolt to be drilled between the top board and lower cavity die of circle screw, and top board one side passes through
One hemispherical punch extrude.
Another technical scheme of the present invention is, there is provided one kind is based on the two-way strain failure performance of above-mentioned hull structural steel
The test method of experimental rig, comprises the following steps：
Step 1：Process test tool and the material tensile test specimens such as top board, lower cavity die, hemispherical punch；
Step 2：Stamping machine is installed, stamping machine is hung on reaction frame, fixed with bolt；
Step 3：Testing stand is installed, adjustment bracket, cavity plate and press plate position, makes bracket hole and cavity plate and pressing plate centering, and make punching
Head and pressing plate centering, are then fixed with gripping block；
Step 4：Test specimen draws grid lines, determines foil gauge layout points；
Step 5：Test specimen and displacement transducer are installed；
Step 6：Experiment has a fling at：Lubricant is coated on test specimen upper surface and drift, with 0.1mm/s speed Slow loading, note
The change of meaning force snesor, observation shooting, when there is visible crack, stop loading, record power and displacement curve；
Step 7：Test specimen of the same race is changed, lubricant is coated on test specimen upper surface and drift, foil gauge is arranged on test specimen, weight
New installation displacement transducer, is loaded with 0.1mm/s speed, when displacement tested displacement close to last time, pays attention to observation shooting, when
When there is visible crack, stop loading, record displacement, test point strain, experiment video recording.
Step 8：Change test specimen of the same race, repeat step 5.
Step 9：Change different shape test specimen, repeat step 5,6.
Supporting measuring instrument force sensor, displacement transducer, foil gauge etc. are tested, force sensor measuring drift applies
To the pressure of test specimen, displacement transducer record test specimen center vertical deviation, foil gauge measures the strain of test point.With prior art
Compare, test facilities are easy, the differently strained biaxial tensile test method than loading, improve the two-way strain failure test of material
While the efficiency of research, experimentation cost is substantially reduced.
Brief description of the drawings
Fig. 1 is one embodiment of the invention biaxial tensile test schematic diagram.
Fig. 2 is the top board structure chart of one embodiment of the invention.
Fig. 3 is the lower cavity die structure chart of one embodiment of the invention.
Fig. 4 is the hemispherical punch structure chart of one embodiment of the invention.
Fig. 5 is the material tensile test specimen design drawing of one embodiment of the invention.
Fig. 6 is the model frock and experimental rig scheme of installation of one embodiment of the invention.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
A kind of two-way strain failure performance experimental rig of hull structural steel of the present invention, using the swollen test principle of rigid mould,
Schematic diagram is shown in Fig. 1, and experiment test specimen 5 is fixed to clamp about 3 with lower cavity die by being drilled with the top board 2 of a circle screw, pressed on test specimen
Plate one side is extruded by a hemispherical punch 1, and constantly shaping is until test specimen cracking, completes experiment；
Described top board 2 is flange-type, and circular hole is opened at center, and circular hole size should be slightly bigger than punch diameter, and the size of top board 2 is shown in attached
Fig. 2；
Circular hole is opened at the described center of lower cavity die 3, and circular hole size should be slightly bigger than punch diameter, and hole upper limb has rounding, the size of lower cavity die 3
See Fig. 3；
Described hemispherical punch 1 use mould steel making, a diameter of 100mm of bulb, and are surface-treated, and drift design is shown in
Fig. 4；
Described supporting material tensile test specimen design, it is differently strained than state to simulate, using the examination of one group of difference length-width ratio
Part, test specimen are fixed between top board and lower cavity die by surrounding bolt hole by fastening bolt 4, and specimen thickness is 2~4mm, examination
Part size design is shown in Fig. 5；
As shown in figure 1, being biaxial tensile test schematic diagram, the schematic diagram is the cross sectional view of experimental rig.This experimental rig includes
Hemispherical punch 1, top board 2, lower cavity die 3, fastening bolt 4.Test specimen 5 is tested in figure to be placed on experimental rig.
The implementation steps of biaxial tensile test are as follows：
Step 1：According to the test tools such as Fig. 2~Fig. 5 structure charts processing top board, lower cavity die, hemispherical punch and material stretching
Test specimen.
Step 2：Stamping machine is installed, according to Fig. 6 test models, stamping machine is hung on reaction frame, fixed with bolt.
Step 3：Testing stand is installed, adjustment bracket, cavity plate and press plate position, makes bracket hole and cavity plate and pressing plate centering, and
Make drift and pressing plate centering, then fixed with gripping block.
Step 4：Test specimen draws grid lines, determines foil gauge layout points.
Step 5：Test specimen and displacement transducer are installed：Displacement transducer thimble withstands on test specimen lower surface center.
Step 6：Experiment has a fling at：Lubricant is coated on test specimen upper surface and drift.Slowly added with 0.1mm/s speed
Carry, pay attention to the change of force snesor, observation shooting, when there is visible crack, stop loading, record power and displacement curve.
Step 7：Test specimen of the same race is changed, lubricant is coated on test specimen upper surface and drift, strain is arranged on test specimen
Piece, displacement transducer is reinstalled, loaded with 0.1mm/s speed, when displacement tested displacement close to last time, notice that observation is taken the photograph
Picture, when there is visible crack, stop loading, record displacement, test point strain, experiment video recording.
Step 8：Change test specimen of the same race, repeat step 5.
Step 9：Change different shape test specimen, repeat step 5,6.
Claims (6)
- A kind of 1. two-way strain failure performance experimental rig of hull structural steel, it is characterised in that including：Hemispherical punch, upper pressure Plate, lower cavity die, fastening bolt；Experiment test specimen is placed on experimental rig；The top board is flange-type, and circular hole is opened at center, and circular hole size should be slightly bigger than hemispherical punch diameter；Circular hole is opened at the lower cavity die center, and circular hole size should be slightly bigger than punch diameter, and hole upper limb has rounding；The experiment test specimen is fixed on by fastening bolt to be drilled between the top board and lower cavity die of circle screw, and top board one side passes through One hemispherical punch extrude.
- A kind of 2. two-way strain failure performance experimental rig of hull structural steel according to claim 1, it is characterised in that institute State hemispherical punch and use mould steel making, bulb diameter 100mm, and be surface-treated.
- A kind of 3. two-way strain failure performance experimental rig of hull structural steel according to claim 1, it is characterised in that institute State experiment test specimen be fixed on by surrounding bolt hole by fastening bolt be drilled with circle screw top board and lower cavity die between.
- A kind of 4. two-way strain failure performance experimental rig of hull structural steel according to claim 1, it is characterised in that institute It is 2~4mm to state experiment specimen thickness.
- 5. based on a kind of test method of the two-way strain failure performance experimental rig of hull structural steel described in claim 1, its It is characterised by, comprises the following steps：Step 1：Process test tool and the material tensile test specimens such as top board, lower cavity die, hemispherical punch；Step 2：Stamping machine is installed, stamping machine is hung on reaction frame, fixed with bolt；Step 3：Testing stand is installed, adjustment bracket, cavity plate and press plate position, makes bracket hole and cavity plate and pressing plate centering, and make punching Head and pressing plate centering, are then fixed with gripping block；Step 4：Test specimen draws grid lines, determines foil gauge layout points；Step 5：Test specimen and displacement transducer are installed；Step 6：Experiment has a fling at：Lubricant is coated on test specimen upper surface and drift, with 0.1mm/s speed Slow loading, note The change of meaning force snesor, observation shooting, when there is visible crack, stop loading, record power and displacement curve；Step 7：Test specimen of the same race is changed, lubricant is coated on test specimen upper surface and drift, foil gauge is arranged on test specimen, weight New installation displacement transducer, is loaded with 0.1mm/s speed, when displacement tested displacement close to last time, pays attention to observation shooting, when When there is visible crack, stop loading, record displacement, test point strain, experiment video recording.Step 8：Change test specimen of the same race, repeat step 5.Step 9：Change different shape test specimen, repeat step 5,6.
- A kind of 6. two-way strain failure performance test method of hull structural steel according to claim 5, it is characterised in that institute State step 5：Displacement transducer thimble withstands on test specimen lower surface center.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711037845.8A CN107860656A (en) | 2017-10-31 | 2017-10-31 | A kind of two-way strain failure performance experimental rig of hull structural steel and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618023A (en) * | 2019-09-20 | 2019-12-27 | 大连理工大学 | Test method for obtaining large bidirectional strain by utilizing male die bulging based on thinned test piece |
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| US5507189A (en) * | 1992-12-30 | 1996-04-16 | Pohang Iron & Steel Co., Ltd. | Apparatus for evaluating plane strain stretch formability, and method therefor |
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| JP2011140046A (en) * | 2010-01-08 | 2011-07-21 | Nippon Steel Corp | Method of specifying breaking strain of plate-like material |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
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| CN106092778A (en) * | 2016-07-08 | 2016-11-09 | 安徽工业大学 | A kind of assay device obtaining forming limit diagram under the conditions of complex loading and method |
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| US5507189A (en) * | 1992-12-30 | 1996-04-16 | Pohang Iron & Steel Co., Ltd. | Apparatus for evaluating plane strain stretch formability, and method therefor |
| KR20100003994A (en) * | 2008-07-02 | 2010-01-12 | 현대자동차주식회사 | Testing system of forming limit diagram for steel plate |
| JP2011140046A (en) * | 2010-01-08 | 2011-07-21 | Nippon Steel Corp | Method of specifying breaking strain of plate-like material |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
| CN103398909A (en) * | 2013-08-05 | 2013-11-20 | 大连理工大学 | Method for acquiring metal temperature forming limit diagram (TFLD) and testing device therefor |
| CN103940681A (en) * | 2014-03-24 | 2014-07-23 | 南京工程学院 | Metal plate multi-pass incremental forming and limit forming performance testing method |
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| 易国锋等: "板料FLD试验胀形冲头形状影响研究", 《华中科技大学学报(自然科学版)》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618023A (en) * | 2019-09-20 | 2019-12-27 | 大连理工大学 | Test method for obtaining large bidirectional strain by utilizing male die bulging based on thinned test piece |
| CN110618023B (en) * | 2019-09-20 | 2021-10-26 | 大连理工大学 | Test method for obtaining large bidirectional strain by utilizing male die bulging based on thinned test piece |
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