CN109520826A - A kind of dedicated compression clamp of different length composite material compression sample longitudinal centering positioning - Google Patents

A kind of dedicated compression clamp of different length composite material compression sample longitudinal centering positioning Download PDF

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Publication number
CN109520826A
CN109520826A CN201811312044.2A CN201811312044A CN109520826A CN 109520826 A CN109520826 A CN 109520826A CN 201811312044 A CN201811312044 A CN 201811312044A CN 109520826 A CN109520826 A CN 109520826A
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China
Prior art keywords
sample
compression
fixture
positioning
blocks
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CN201811312044.2A
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Chinese (zh)
Inventor
王奇
王一奇
邵珠剑
王欢
孙海琦
高劲松
鲍永杰
高航
葛恩德
李汝鹏
肖睿恒
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Dalian University of Technology
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Dalian University of Technology
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Priority to CN201811312044.2A priority Critical patent/CN109520826A/en
Publication of CN109520826A publication Critical patent/CN109520826A/en
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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
    • G01N3/04—Chucks
    • 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
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0405—Features allowing alignment between specimen and chucks

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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 invention discloses the dedicated compression clamps and method of a kind of compression sample longitudinal centering positioning of different length composite material, belong to composite materials property the field of test technology.Left and right compression blocks are closed up centering and clamp sample by fishbolt, the screw thread longitudinal direction upper and lower ends matched on the compression blocks of left and right screw in positioning screw, it is read referring to graduated scale, accurate longitudinal centering is carried out to the sample for the different length being fitted into, guarantees longitudinal centering precision of the sample in fixture.The present invention realizes the compressive strength test that different length sample is carried out on general compression experiment machine, expand the restriction range of specimen size, improve the longitudinal centering precision of the shorter sheet coupon of length, improve the accuracy that compressibility of materials can test, it is easy to process, it is convenient for disassembly and assembly, sample material is saved, experimental cost is reduced.

Description

A kind of dedicated compression of different length composite material compression sample longitudinal centering positioning Fixture
Technical field
The present invention relates to a kind of compression clamp of raising different length composite material compression sample longitudinal centering precision and sides Method is effectively ensured sample and is in fixture middle for the compression sample of different length, plays auxiliary clamping action.Belong to compound Material mechanical performance testing field.
Background technique
With composite material in aerospace and automobile manufacturing field using more and more extensive, each field is for material The requirement of performance is also higher and higher, therefore the Mechanics Performance Testing of composite material needs higher accuracy.Material compression process In, sample is until rupture (fragile material) or generation surrender the maximal compressed stress born when (non brittle materials) and be known as compressing Intensity.Compressive strength is an important mechanical index, it characterizes material and resists compressive load without the ability of failure, for material Design, use etc. it is extremely important.Sample needs to be accurately fitted in fixture before compression, i.e. guarantee sample is in fixture Good centering, otherwise sample discontinuity occurs stress and concentrates, seriously affect the accuracy of experiment.Currently, most compressions Fixture is more suitable for longer and fixed length compressed sheet sample, can not be compared with for some plates shorter caused by reasons because of processing etc. Good carry out longitudinal centering；For the plate that certain valuable or production is not easy, when carrying out compression experiment with existing compression clamp, The longer waste that will will cause material of length increases experimental cost；To when thering is the shorter plate of particular requirement to test without Method realizes accurate longitudinal centering, will lead to experimental data and error occurs, influences the accuracy of experimental result, it is more difficult to tie experiment Fruit is applied in engineering.
Summary of the invention
It is an object of that present invention to provide a kind of suitable for the special of different length composite board sample compressive strength test With compression clamp and method, different length sample longitudinal centering problem can effectively solve the problem that.Method is simple, easy to process, dismounting It is convenient, it realized under the premise of can guarantee measuring accuracy to middle fixed sample, flexibly replace sample, reduced testing cost, mention High conventional efficient.
Technical solution of the present invention:
A kind of dedicated compression clamp of different length composite material compression sample longitudinal centering positioning, including compression clamp master Body and detachable positioning screw；
Compression clamp main body includes four compression blocks axisymmetricly, and the surface for the compression blocks being in contact with sample 9 is provided with With the perforation incomplete thread 8 of positioning screw cooperation；Compression clamp side is equipped with scale 11 close to the outer surface of sample；Sample 9 Upper and lower ends be mounted on positioning screw, pass through positioning screw realize 9 position of sample adjustment；When carrying out, different length is compound When material compresses the compression experiment of sample 9, the position of sample 9 is positioned come accurate longitudinal centering by scale 11, by adjusting simultaneously After tested sample 9 is installed on the middle of compression clamp by two positioning screws above and below saving, then horizontal clamping sample 9 carries out reality It tests.
Preferably, upper and lower compression blocks are connected by guide post.
Preferably, left and right ends compression blocks pass through four fishbolts (totally eight) connection respectively, using M10 countersunk head spiral shell Bolt, horizontal clamping sample.
Preferably, in fixture front close to the side of sample, two sections scale label is identical for scale processing, thus longitudinal Centering sample.
Preferably, screw thread beats the centre in the opposite compression blocks in left and right, runs through compression blocks.
Preferably, for the size of the screw thread on fixture and positioning screw according to adjusting needed for sample thickness, screw internal diameter is big In sample thickness.Matching thread passes through following processing method on fixture: will be placed in upper left pressure with the backing plate of sample to be tested equal thickness Among contracting block and upper right compression blocks, keeps backing plate concordant with compression blocks upper and lower end face, be fastened and fixed to form stabilization by compression blocks Clamping group；The threaded hole that internal diameter is greater than plate thickness is processed at the center of clamping group upper surface；Lower-left compression blocks and bottom right compression Block can be with same manner working process.Pass through positioning screw after removing backing plate and is threadedly engaged and different length sample can be carried out Longitudinal centering is fixed.
Preferably, the compression clamp main body is made of 45# steel, and having a size of long 50mm, wide 55mm, high 80mm are fixed Position screw is made of 45# steel, and interior electrical path length ratio is equal to 1.
Compared with prior art, the beneficial effects of the present invention are: composite board sample for different length, passes through The longitudinal precisely centering positioning of the rod reading progress of chucking surface, by positioning screw above and below the cooperation of compression clamp main body to tested Sample is gripped, it is ensured that sample is precisely installed on the centre of fixture, avoids causing pressing since sample is shorter Sliding up and down in compression process improves sample longitudinal centering precision, improves the accuracy of experimental result.Examination for different length Sample only needs to change various sizes of positioning screw, is readily disassembled, and does not have to replacement jig main body, saves human and material resources, improves experiment Efficiency.
Detailed description of the invention
Fig. 1 (a) is the structural perspective of compression clamp preferred embodiment described in present example.
Fig. 1 (b) is the structural side view of compression clamp preferred embodiment described in present example.
Fig. 2 is the front view (half-sectional) of compression clamp preferred embodiment described in present example.
Fig. 3 is the side view of compression clamp preferred embodiment described in present example.
Fig. 4 is the top view (complete section) of compression clamp preferred embodiment described in present example.
In figure: the first guide pillar hole of 1-1；The second guide pillar hole of 1-2；The first positioning screw of 2-1；The second positioning screw of 2-2；3-1 First fishbolt；The second fishbolt of 3-2；3-3 third fishbolt；The 4th fishbolt of 3-4；The 5th fishbolt of 3-5； The 6th fishbolt of 3-6；The 7th fishbolt of 3-7；The 8th fishbolt of 3-8；4 upper right compression blocks；5 bottom right compression blocks；6 lower-lefts Compression blocks；7 upper left compression blocks；8 screw threads；9 samples；The first guide post of 10-1；The second guide post of 10-2；11 scales.
Specific embodiment
The present invention provides a kind of dedicated compression clip suitable for the fixed different length composite board sample of longitudinal centering Tool and method, to be more clear the purpose of the present invention, scheme and effect, as follows in conjunction with drawings and embodiments to this compression Fixture is further described.Specific embodiment cited herein is only further described invention simultaneously, is not this hair Bright restriction.
Attached drawing 1 and attached drawing 2 are please referred to, is structural schematic diagram and front view (half-sectional) of the invention, the pressure respectively Contracting fixture includes the positioning screw of compression clamp main body and distribution symmetrical above and below.
The present invention is a kind of compression clamp and method suitable for the fixed different length composite board sample of centering.Institute The compression clamp stated includes the positioning screw of compression clamp main body, longitudinally asymmetric distribution.The compression clamp main body is mainly wrapped Upper right compression blocks 4, bottom right compression blocks 5, lower-left compression blocks 6 and upper left compression blocks 7 are included, they are symmetric, size dimension phase Together, centre vacates a fixed gap and places sample, and the center of four compression blocks cross sections is provided with longitudinal hole, to lead with first Column 10-1, the second guide post 10-2 cooperation, and then realize the longitudinal movement of compression blocks up and down, corresponding kinematic accuracy is kept, thus Realize the compression process of material.Upper right compression blocks 4 and upper left compression blocks 7, bottom right compression blocks 5 and lower-left compression blocks 6 are fitting Face center is provided with longitudinally through imperfect joint screw thread, cooperates with the first positioning screw 2-1, the second positioning screw 2-2；The One positioning screw 2-1 and the second positioning screw 2-2 realizes longitudinal centering process of the sample 9 before clamping.Upper right compression blocks 4 and the right side Lower compression blocks 5 are processing graduated scale 11 close to 9 side of sample, exist for the first positioning screw 2-1 and the second positioning screw 2-2 Positioning calibration in centering process.Upper right compression blocks 4 and bottom right compression blocks 5 are equipped with stepped hole and threaded hole, with eight folders of installation The head of tight bolt and threaded portion.Lower-left compression blocks 6 and upper left compression blocks 7 are equipped with threaded hole on right side, with installation eight The threaded portion of fishbolt.Tested sample 9 is installed between left and right two parts compression blocks, and sample 9 is composite board examination Sample.
The longitudinal direction aperture of compression clamp supporting block cooperates with guide post, realizes compression clip specifically longitudinally opposite linear motion, and Guarantee that the straightness tolerance of movement is no more than 0.1mm.The size of sample 9 is determined according to specific requirement, but the width of sample 9 is general No more than 20mm.Due to the indefinite length of sample 9, so the longitudinally disposed positioning screw of compression clamp, right side compression blocks surface is leaned on Graduated scale 11 is set at nearly sample 9, realizes and the longitudinal centering of sample 9 is positioned.Last fixture 8 clamping spiral shells of lateral arrangement Bolt carries out horizontal clamping to sample 9.
It the described method comprises the following steps: preparation compression clamp and tested sample 9 first；Sample 9 is compareed scale to determine Approximate location；Sample 9 is installed in compression clamp, tentatively fastens sample 9 using fishbolt；Longitudinal upper and lower ends are revolved simultaneously Enter positioning screw；According to 11 scale precise positioning of scale, i.e. about 11 scale corresponding to position of the sample 9 in fixture is read When identical, sample 9 realizes longitudinal centering；Last fastening process is carried out with fishbolt.Followed by the matched meter of experimental machine Experiment parameter is arranged in experimental machine control software on calculation machine, starts to load.Fracture (fragile material) occurs to material or surrender is existing Stop experiment when as (plastic material), the stress-strain curves of sample 9 are recorded by computer, material is calculated according to curve The compression strength values of material.
Embodiment
In the present embodiment, compressive strength test is carried out using natural-fiber composite material sheet coupon 9, test material is Asia Flaxen fiber composite material, 9 width of sample is 20mm, with a thickness of 4mm, length 80mm.Pass through computer matched with experimental machine On experimental machine control software be arranged experiment parameter, start to test.
Tested sample 9 is longitudinally inserted into compression clamp, and left and right compression blocks are drawn close centering by horizontal clamping bolt；It is longitudinal same When screw in two positioning screws, using graduated scale 11 determine sample 9 in the position of fixture longitudinal direction centre；Pass through fishbolt Sample 9 is fastened.By computer set experimental parameters, 1.0mm/min is set by experiment compression speed, is started real It tests.Force value, strain data information are recorded in experimentation.Persistently being loaded onto experiment when sample 9 destroys terminates.Remembered by computer The stress-strain curves for recording sample 9, obtain the compression strength values of flax fiber composite board on a preset condition based.Repeatedly Experiment discovery experimental result is very close to error is smaller.

Claims (6)

1.一种不同长度复合材料压缩试样纵向对中定位的专用压缩夹具，其特征在于，所述的专用压缩夹具包括压缩夹具主体和可拆卸的定位螺钉；1. A special compression fixture for longitudinally centering positioning of composite material compression samples of different lengths, characterized in that, the special compression fixture includes a compression fixture main body and a detachable positioning screw; 压缩夹具主体包括呈轴对称的四个压缩块，与试样(9)相接触的压缩块的表面开有与定位螺钉配合的贯通不完整螺纹(8)；压缩夹具一侧靠近试样的外表面设有标尺(11)；试样(9)的上下两端均安装有定位螺钉，通过定位螺钉实现试样(9)位置的调整；当进行不同长度复合材料压缩试样(9)的压缩实验时，通过标尺(11)来精准纵向对中定位试样(9)的位置，通过同时调节上下两个定位螺钉将被测试样(9)安装于压缩夹具的正中间后，再横向夹紧试样(9)进行实验。The main body of the compression fixture includes four axisymmetric compression blocks, and the surface of the compression block in contact with the sample (9) is provided with a through incomplete thread (8) that cooperates with the positioning screw; one side of the compression fixture is close to the outer surface of the sample. A scale (11) is provided on the surface; positioning screws are installed at the upper and lower ends of the sample (9), and the position adjustment of the sample (9) is realized through the positioning screws; when compressing the composite material compression sample (9) of different length During the experiment, use the ruler (11) to accurately center the position of the sample (9) vertically, and install the sample (9) to be tested in the middle of the compression fixture by adjusting the upper and lower positioning screws at the same time, and then clamp it horizontally Sample (9) perform experiments. 2.根据权利要求1所述的专用压缩夹具，其特征在于，所述的标尺(11)设置在压缩夹具正面靠近试样(9)的一侧，位于上、下两块压缩块上的标尺(11)刻度相同，纵向对中试样。2. The special compression fixture according to claim 1, characterized in that, said scale (11) is set on the side of the front of the compression fixture close to the sample (9), and the scales on the upper and lower compression blocks (11) The scale is the same, and the sample is vertically centered. 3.根据权利要求1或2所述的专用压缩夹具，其特征在于，上下的压缩块通过导柱连接。3. The special compression fixture according to claim 1 or 2, characterized in that the upper and lower compression blocks are connected by guide posts. 4.根据权利要求3所述的专用压缩夹具，其特征在于，左右的压缩块分别通过四根夹紧螺栓连接，采用M10沉头螺栓，横向夹紧试样。4. The special compression fixture according to claim 3, characterized in that the left and right compression blocks are respectively connected by four clamping bolts, and M10 countersunk bolts are used to clamp the sample laterally. 5.根据权利要求1、2或4所述的专用压缩夹具，其特征在于，所述的螺纹(8)打在左右相对的压缩块的正中央，贯穿压缩块。5. The special-purpose compression clamp according to claim 1, 2 or 4, characterized in that the said thread (8) is punched in the center of the left and right opposite compression blocks, and runs through the compression blocks. 6.根据权利要求5所述的专用压缩夹具，其特征在于，压缩夹具上的螺纹(8)及定位螺钉的尺寸根据试样厚度所需来调整，定位螺钉内径大于试样(9)厚度。6. The special compression fixture according to claim 5, characterized in that the size of the screw thread (8) and the positioning screw on the compression fixture is adjusted according to the thickness of the sample, and the inner diameter of the positioning screw is greater than the thickness of the sample (9).
CN201811312044.2A 2018-11-06 2018-11-06 A kind of dedicated compression clamp of different length composite material compression sample longitudinal centering positioning Pending CN109520826A (en)

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CN111122303A (en) * 2019-12-26 2020-05-08 西安交通大学 A size-adjustable pressure-fixed centering device and centering method
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CN113702180A (en) * 2021-08-13 2021-11-26 山东钢铁集团日照有限公司 Initial accurate accuse position isolated plant of tensile properties test

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Application publication date: 20190326