CN107132129A - A kind of adjustable many suitable type three point bending test devices - Google Patents
A kind of adjustable many suitable type three point bending test devices Download PDFInfo
- Publication number
- CN107132129A CN107132129A CN201710281631.9A CN201710281631A CN107132129A CN 107132129 A CN107132129 A CN 107132129A CN 201710281631 A CN201710281631 A CN 201710281631A CN 107132129 A CN107132129 A CN 107132129A
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- slot
- microgroove
- point bending
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- hole
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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
- G01N3/02—Details
-
- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing 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
- G01N2203/0023—Bending
-
- 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
- G01N2203/0025—Shearing
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- Physics & Mathematics (AREA)
- 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 present invention provides a kind of adjustable many suitable type three point bending test devices, including seaming chuck, two push-down heads, bases；Base is provided with T-slot；T-slot can be slided provided with two T-nuts, T-nut in T-slot；The top and side of T-nut are respectively equipped with screwed hole；Push-down head includes vertical component effect and horizontal part；The top of vertical component effect is used to place testpieces；Horizontal part is provided with through hole, and through hole is connected by the screw top hole of bolt and T-nut；Two microgroove stay bolts are additionally provided with T-slot, the head of two microgroove stay bolts is exposed to outside the two ends of T-slot respectively, the screw rods of two microgroove stay bolts coordinates with the flank threads hole of two T-nuts respectively；Rotate position of the whole push-down head of controllable nose of microgroove stay bolt in T-slot.The present invention can adapt to multiclass three point bending test by replaceable pressure head, also can be high with stability by changing being supported with base to adapt to different tests machine clamp for seaming chuck, the features such as simple to operate.
Description
Technical field
The invention belongs to material mechanical performance test and characterization technique field, and in particular to a kind of adjustable many suitable 3 points of types are curved
Bent experimental rig.
Background technology
In recent years, constantly made progress with the correlative study of composite property, more and more composites are transported
Use aviation, space flight, the field such as military affairs, the research method of material is also worth further improving, to improve Efficiency.Although examination
Proved recipe case can not change, but can be by improving test toolss improving scientific research efficiency.Therefore, improving test toolss turns into state
The only way which must be passed of the inside and outside emerging composite of Most scholars research.
Bending property, Interlaminar shear strengths and the type performance of fracture toughness II of material etc. are all the experiments by three-point bending
Mode is measured.It is a kind of test method for measuring material bending performance that three-point bending, which is defined, and the country is existing to this kind of experiment
Experimental method is simply to lie against bar-shaped sample in bend test fixture, forms simply supported beam form, two of support sample
Distance between the lower strong point is adjustable regarding specimen length, and only one of which load(ing) point above sample.
The radius of the upper and lower pressure head needed due to different tests is different and the distance between two push-down heads difference, causes
The different many unnecessary workloads of fixture increase are designed every time, and financial cost is also improved a lot；Fixture pressure head it
Between adjust in the past be all that artificial progress is moved manually, some deviations are understood in many positions, increase the error of experiment.
Because three-point bending class tests relatively easy, when many people carry out the experiment of three-point bending classes to the design of fixture excessively
Carelessness, causes the result of the test measured very inaccurate.Three point bending test device of the prior art includes base, is fixedly installed
Being used on base supports two support bases of testing experiment part and added above support base and for being produced to testpieces
The pressure head of power is carried, two support bases are arranged on the both sides of pressure head.During experiment, the two ends of testpieces are individually positioned in two support bases
On, pressure head is pressed downward producing testpieces down force by the downward bending of testpieces to testpieces, carries out 3 points of testpieces
Bend test.This fixture can only often carry out a kind of three point bending test, apply load pressure head and support pressure head can not be ensured of it is perpendicular
Straight, when supporting the span between pressure head to be adjusted during experiment, adjust manually may be inaccurate and can for distance between two pressure heads
Can be not parallel.
The content of the invention
For above-mentioned the deficiencies in the prior art, the present invention provides a kind of adjustable many suitable type three point bending test devices, can be with
By replaceable pressure head so as to adapt to multiclass three point bending test, also difference can be adapted to by changing seaming chuck post and base support
Pressure head of testing machine, the drawbacks of reduction influences test data accuracy because of testpieces three-point bending is high with stability, operation letter
Single the features such as.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of adjustable many suitable type three point bending test devices, including seaming chuck, two push-down heads；Also include base；It is described
Base is provided with T-slot；T-slot can be slided provided with two T-nuts, the T-nut in T-slot；The T-nut
Top and side be respectively equipped with screwed hole；The push-down head includes vertical component effect and horizontal part；The top of the vertical component effect is used for
Place testpieces；The horizontal part is provided with through hole, and the through hole is connected by the screw top hole of bolt and T-nut；Institute
State and two microgroove stay bolts are additionally provided with T-slot, the head of described two microgroove stay bolts is exposed to the two ends of T-slot respectively
Outside, flank threads hole of the screw rod of described two microgroove stay bolts respectively with two T-nuts coordinates；Rotate microgroove stay bolt
Position of the whole push-down head of controllable nose in T-slot.
Further, the seaming chuck includes corner block and is connected rectangular block with corner block bottom surface；During experiment, testing machine
Upper bare terminal end clamps rectangular block, and the top margin of corner block is fitted with testpieces.
Further, provided with base support, during experiment, the lower bare terminal end Holding seat branch of testing machine below the base
Support.
Further, the base is provided with graduation mark.
Further, the base two ends are respectively equipped with baffle plate, and baffle plate is provided with through hole, lead to for the screw rod of microgroove stay bolt
Cross, play the role of positioning simultaneously, make microgroove long nut avoid skidding off from side when in use.
Further, the both sides of the base set the rectangular slat parallel with T-slot, both sides rectangular slat difference respectively
Fit, rotated during limiting push-down head movement with the both sides of push-down head.
Beneficial effects of the present invention are：
1) because pressure head can be changed, it is adapted to the three point bending test of multiclass, such as：Bending property experiment, it is short
The experiment of beam interlaminar shear strength, the experiment of the type of fracture toughness II etc..
2) the distance between two push-down heads are adjusted by rotating microgroove stay bolt, the position of push-down head can be accurately adjusted
Put, and tighten bolt latter two push-down head to move again.
3) base both sides are provided with rectangular slat, can prevent in rotation microgroove stay bolt come during moving push-down head,
Push-down head is glanced off.
4) seaming chuck is designed to the T-shape that both sides are protruded, and it is also T-shape that base support and base, which link together,
Because grip of testing machine is standard level, seaming chuck and base support are against on grip of testing machine, it is ensured that seaming chuck is
Straight down, it also ensure that plane is level on base.
5) repeatability for making fixture is reduced.
Brief description of the drawings
The stereogram of Fig. 1 three point bending test devices；
The profile of Fig. 2 three point bending test devices；
The stereogram of Fig. 3 three point bending test device seaming chucks；
The stereogram of Fig. 4 three point bending test device pedestals；
The stereogram of Fig. 5 three point bending test device push-down heads；
The stereogram of the upper and lower baffle plate of Fig. 6 three point bending test devices；
The stereogram of Fig. 7 three point bending test device T-nuts；
The stereogram of Fig. 8 three point bending tests device pedestal support；
The stereogram of Fig. 9 three point bending test device microgroove long nuts；
In figure：1st, seaming chuck；1-1, corner block；1-2, rectangular block；2nd, push-down head；2-1, vertical component effect；2-2, horizontal part；2-
3rd, through hole；3rd, base；4th, overhead gage；5th, lower baffle plate；6th, T-nut；6-1, screw top hole；6-2, flank threads hole；7th, bottom
Seat supports；8th, microgroove stay bolt；9th, bolt；10th, hex bolts；11st, T-slot；12nd, graduation mark；13rd, spacing hole；14th, rectangle is long
Bar.
Embodiment
Three point bending test device of the present invention is described in further details below in conjunction with the accompanying drawings.
As shown in accompanying drawing 1,2, the present invention includes seaming chuck 1, two push-down heads 2, bases 3；The base 3 is provided with T-shaped
Groove 11；T-slot 11 can be slided provided with two T-nuts 6, the T-nut 6 in T-slot 11；The top of the T-nut 6
Portion and side are respectively equipped with screw top hole 6-1, flank threads hole 6-2；The push-down head 2 includes vertical component effect 2-1 and horizontal part
2-2；The top of the vertical component effect 2-1 is used to place testpieces；The horizontal part 2-2 is provided with through hole 2-3, the through hole 2-3
It is connected by bolt 9 with the screw top hole 6-1 of T-nut 6；Two microgroove stay bolts 8, institute are additionally provided with the T-slot 11
The head for stating two microgroove stay bolts 8 is exposed to outside the two ends of T-slot 11 respectively, the screw rod point of described two microgroove stay bolts 8
Flank threads hole 6-2 not with two T-nuts 6 coordinates；By the whole push-down head 2 of the controllable nose for rotating microgroove stay bolt 8 in T
Position in type groove 11.
Square type groove is had in the left and right ends of base 3, for placing overhead gage 4 and lower baffle plate 5.Overhead gage 4 is with
Semicircular indentations are equipped with one side of baffle plate 5, on the side, the circular arc side of overhead gage 4 is downward for the circular arc one of lower baffle plate 5,
The semicircular indentations formation spacing hole 13 that two are relative in rectangular through slot is sequentially inserted into, is passed through for the screw rod of microgroove stay bolt, and
Microgroove long nut 8 constitutes spacing hole location fit in screw tip turning annular groove with upper 5, lower baffle plate 6, makes the long spiral shell of microgroove
Mother 8 avoids skidding off from side when in use.
The lower section of base 3 supports 7 by the connect base of hex bolts 10.The raised rectangular slat 14 in the front and rear sides of base 3, two
Side rectangular slat 14 is fitted respectively at the both sides of push-down head 2, can guarantee that push-down head 2 is slided on predetermined track, and keeps water
It is flat.Push-down head 2 is provided with graduation mark 12, when testpieces is placed on push-down head 2, makes the testpieces pair on left and right push-down head 2
Identical scale on quasi- graduation mark 12, will not be glanced off when can so be placed with guarantee test part.
Seaming chuck 1 includes corner block 1-1 and is connected rectangular block 1-2 with corner block 1-1 bottom surfaces；During experiment, testing machine it is upper
Bare terminal end clamps rectangular block 1-2, and corner block 1-1 top margin is fitted with testpieces., will because grip of testing machine is standard level
Seaming chuck 1 and base support 7 are against on grip of testing machine, it is ensured that seaming chuck 1 is straight down, to also ensure that on base 3
Plane is level.
Because it not is an integer that sometimes span, which is, and it is trouble to adjust one manually, and two be inaccurate, is so tested
Error is just very big, is at this time accomplished by using microgroove stay bolt 8, often rotates one and encloses, push-down head just mobile 0.2mm or so, guarantor
The accuracy of experimental result is demonstrate,proved.
The operation principle of three point bending test device of the present invention：
Before forces testing is carried out to testpieces, changing required push-down head according to different tests requirement first, (nut is not twisted
Tightly).The right and left rotates microgroove long nut by position needed for base movable press head to experiment；Secondly the three point bending test is filled
Seaming chuck is put on bare terminal end on testing machine, base support is connected with the lower bare terminal end of testing machine, and testpieces is lain in
On three point bending test device push-down head, the testpieces on the push-down head of left and right is directed at identical scale on graduation mark, complete dress
Folder.
During experiment, the upper bare terminal end of testing machine drives seaming chuck to move downward, and pressure head is controlled with certain by computer terminal
Speed push, downward active force is produced to testpieces, by the downward bending of testpieces, the three-point bending examination of testpieces is carried out
Test.Testpieces is in BENDING PROCESS, testpieces and the end in contact of push-down head two, by upward support force, due to seaming chuck speed
Relatively low and testpieces is symmetrical, and pressure is slowly increased, and testpieces will not typically produce sliding phenomenon, be finally completed correct 3 points it is curved
Curved state.
The description of process of the test：The experiment of the type of fiber resin matrix fracture of composite materials toughness II is taken to be described；
Testpieces prepares：The unidirectional laying number of fiber resin matrix composite material rectangular plate is 24 layers, and size is 140mm*25mm*
Mono- piece of 3mm, a prefabricated thickness is not more than 0.05mm between 12-13 layers of testpieces one end and length is the smooth crackles of 40mm.
Testpieces is installed：Rotation microgroove long nut is first passed through to adjust the span of two push-down heads of three point bending test device
For 70mm (having graduated scale on chucking surface), the contact point of left side push-down head and testpieces to testpieces precrack root away from
From more than or equal to 25mm, position of the testpieces on the graduation mark on two push-down heads is the same, and opening testing machine makes testpieces pre-
After Crack Extension 5mm processed or so, stop loading, remove testpieces, continuation rotation microgroove stay bolt makes between two push-down heads
Span is 100mm, and the contact point of left side push-down head and testpieces is more than or equal to 25mm to the distance of testpieces precrack root.
Testpieces is tested：Firing test machine, keeps pressure head to be loaded with test requirements document speed, when testpieces fails,
Experiment terminates, and observes load-load(ing) point sag curve.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of adjustable many suitable type three point bending test devices, including seaming chuck, two push-down heads, bases；Characterized in that, institute
Base is stated provided with T-slot；T-slot can be slided provided with two T-nuts, the T-nut in T-slot；The T-shaped spiral shell
Female top and side is respectively equipped with screwed hole；The push-down head includes vertical component effect and horizontal part；Use at the top of the vertical component effect
In placement testpieces；The horizontal part is provided with through hole, and the through hole is connected by the screw top hole of bolt and T-nut；
Two microgroove stay bolts are additionally provided with the T-slot, the head of described two microgroove stay bolts is exposed to the two ends of T-slot respectively
Outside, flank threads hole of the screw rod of described two microgroove stay bolts respectively with two T-nuts coordinates；Rotate microgroove stay bolt
Position of the whole push-down head of controllable nose in T-slot.
Type three point bending test devices are fitted 2. one kind according to claim 1 is adjustable, it is characterised in that the seaming chuck more
The rectangular block being connected including corner block and with corner block plane perpendicular；During experiment, the upper bare terminal end clamping rectangular block of testing machine, three
The top margin of hornblock is fitted with testpieces.
Type three point bending test devices are fitted 3. one kind according to claim 1 is adjustable, it is characterised in that under the base more
Side is provided with base support, during experiment, the lower bare terminal end Holding seat support of testing machine.
Type three point bending test devices are fitted 4. one kind according to claim 1 is adjustable, it is characterised in that on the base more
Provided with graduation apparatus.
Type three point bending test devices are fitted 5. one kind according to claim 1 is adjustable, it is characterised in that the base two more
End is respectively equipped with baffle plate, and baffle plate is provided with through hole, passes through for the screw rod of microgroove stay bolt, play the role of positioning simultaneously, make microgroove long
Nut avoids skidding off from side when in use.
Type three point bending test devices are fitted 6. one kind according to claim 1 is adjustable, it is characterised in that the base more
Both sides set the rectangular slat parallel with T-slot respectively, and both sides rectangular slat is fitted with the both sides of push-down head respectively, to limit
Push-down head rotates when moving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281631.9A CN107132129A (en) | 2017-04-26 | 2017-04-26 | A kind of adjustable many suitable type three point bending test devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281631.9A CN107132129A (en) | 2017-04-26 | 2017-04-26 | A kind of adjustable many suitable type three point bending test devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107132129A true CN107132129A (en) | 2017-09-05 |
Family
ID=59715317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710281631.9A Pending CN107132129A (en) | 2017-04-26 | 2017-04-26 | A kind of adjustable many suitable type three point bending test devices |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051298A (en) * | 2017-11-28 | 2018-05-18 | 海洋石油工程股份有限公司 | Test fixture is carried for the guarantor of more specification nuts |
| CN108519286A (en) * | 2018-04-27 | 2018-09-11 | 中国信息通信研究院 | A kind of load test equipment and test method for chute |
| CN109387442A (en) * | 2018-10-31 | 2019-02-26 | 中国人民解放军第五七九工厂 | A kind of bend test fixture that can accurately adjust span and method |
| CN109632526A (en) * | 2019-01-21 | 2019-04-16 | 哈尔滨理工大学 | A kind of novel three point bending test device |
| CN109738300A (en) * | 2018-10-31 | 2019-05-10 | 中国飞机强度研究所 | A kind of curved scissors combination test apparatus of pin shaft base part |
| CN109950167A (en) * | 2019-03-28 | 2019-06-28 | 华南理工大学 | A kind of bending machine |
| CN110220773A (en) * | 2019-05-28 | 2019-09-10 | 浙江工业大学 | A kind of adjustable three, the universal testing machine fixture of four-point bending |
| CN110274828A (en) * | 2019-07-23 | 2019-09-24 | 东莞理工学院 | A kind of compression testing machine for cardboard box |
| CN110618041A (en) * | 2019-10-30 | 2019-12-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Bending integrated testing machine |
| CN110849703A (en) * | 2019-12-23 | 2020-02-28 | 北京理工大学 | Mechanical property testing device, equipment and method |
| CN112630010A (en) * | 2021-01-05 | 2021-04-09 | 镇江市产品质量监督检验中心 | Fixing mechanism for bending test |
| CN112665966A (en) * | 2020-12-15 | 2021-04-16 | Oppo（重庆）智能科技有限公司 | Precision controller |
| CN114371071A (en) * | 2021-12-31 | 2022-04-19 | 核工业西南物理研究院 | Dual-purpose test fixture for three-point bending and shearing of small sample |
| CN114486555A (en) * | 2021-12-30 | 2022-05-13 | 中国飞机强度研究所 | Centering device and composite material three-point bending test fixture assembly |
| CN117949291A (en) * | 2024-03-26 | 2024-04-30 | 烟台博海木工机械有限公司 | Elastic modulus detection device for wood beam layer plate |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108051298A (en) * | 2017-11-28 | 2018-05-18 | 海洋石油工程股份有限公司 | Test fixture is carried for the guarantor of more specification nuts |
| CN108519286A (en) * | 2018-04-27 | 2018-09-11 | 中国信息通信研究院 | A kind of load test equipment and test method for chute |
| CN109387442A (en) * | 2018-10-31 | 2019-02-26 | 中国人民解放军第五七九工厂 | A kind of bend test fixture that can accurately adjust span and method |
| CN109738300A (en) * | 2018-10-31 | 2019-05-10 | 中国飞机强度研究所 | A kind of curved scissors combination test apparatus of pin shaft base part |
| CN109632526A (en) * | 2019-01-21 | 2019-04-16 | 哈尔滨理工大学 | A kind of novel three point bending test device |
| CN109950167A (en) * | 2019-03-28 | 2019-06-28 | 华南理工大学 | A kind of bending machine |
| CN110220773A (en) * | 2019-05-28 | 2019-09-10 | 浙江工业大学 | A kind of adjustable three, the universal testing machine fixture of four-point bending |
| CN110274828A (en) * | 2019-07-23 | 2019-09-24 | 东莞理工学院 | A kind of compression testing machine for cardboard box |
| CN110618041A (en) * | 2019-10-30 | 2019-12-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Bending integrated testing machine |
| CN110618041B (en) * | 2019-10-30 | 2022-05-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Bending integrated testing machine |
| CN110849703A (en) * | 2019-12-23 | 2020-02-28 | 北京理工大学 | Mechanical property testing device, equipment and method |
| CN112665966A (en) * | 2020-12-15 | 2021-04-16 | Oppo（重庆）智能科技有限公司 | Precision controller |
| CN112630010A (en) * | 2021-01-05 | 2021-04-09 | 镇江市产品质量监督检验中心 | Fixing mechanism for bending test |
| CN114486555A (en) * | 2021-12-30 | 2022-05-13 | 中国飞机强度研究所 | Centering device and composite material three-point bending test fixture assembly |
| CN114371071A (en) * | 2021-12-31 | 2022-04-19 | 核工业西南物理研究院 | Dual-purpose test fixture for three-point bending and shearing of small sample |
| CN117949291A (en) * | 2024-03-26 | 2024-04-30 | 烟台博海木工机械有限公司 | Elastic modulus detection device for wood beam layer plate |
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Application publication date: 20170905 |