CN105651691A - T-shaped tear experiment die and experiment method - Google Patents
T-shaped tear experiment die and experiment method Download PDFInfo
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- CN105651691A CN105651691A CN201610116315.1A CN201610116315A CN105651691A CN 105651691 A CN105651691 A CN 105651691A CN 201610116315 A CN201610116315 A CN 201610116315A CN 105651691 A CN105651691 A CN 105651691A
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Abstract
The invention relates to a T-shaped tear experiment die and an experiment method. The T-shaped tear experiment die comprises a fixed guide portion and an elastic extensible portion, the fixed guide portion is provided with a gap for placement of a non-torn portion of a detected T-shaped sample and used for straightening the non-torn portion of the T-shaped sample, two symmetric portions of the elastic extensible portion are arranged on two sides of the gap of the fixed guide portion and connected with the two sides of the gap respectively, and the two symmetric portions can elastically and extensibly deform. According to the technical scheme, the symmetric portion of the elastic extensible portion is connected with a clamp head at one end of a tear stretching experiment machine while the other portion of the same is connected with a clamp head at the other end of the tear stretching experiment machine, a stretching clamp head moves to drive the detected T-shaped sample to move in a stretching direction, and the detected T-shaped sample is maintained constantly in the middle of the two clamp heads of the experiment machine in the process of a tear experiment, so that warping of the non-torn portion of the T-shaped tear sample is prevented; the detected T-shaped sample is maintained constantly perpendicular to a tear stretching direction, so that accuracy and stability of experiment detection results are guaranteed.
Description
Technical field
The invention mainly relates to composite tear test, particularly relate to a kind of T-shaped tear test mould of composite and test method.
Background technology
Composite is by certain cladding ratio by coating and base material, through certain combination process lamellar composite together. Combination process is the demand in order to adapt to different materials, makes the material property after compound more excellent, makes every layer of material give full play to its different performance, thus composite has more better performance and lower cost.
Layered metal composite material, owing to having the combination property of excellence, has obtained in fields such as generating, oil, chemical industry, automobile, buildings and has been widely applied. The bond quality at layered metal composite material interface can affect use and the life-span thereof of product, and therefore interface quality is to evaluate the leading indicator that layered metal composite material performance is good and bad.
At present, the method for conventional detection by quantitative interface bond strength is drawn and is cut, presses and cut, and method has bending method qualitatively. During layer thickness as each in multi-layer metal composite material relatively thin (< 0.5-1mm), generally use the mode torn to detect the quality of interface cohesion, generally use yi word pattern and tear such as Fig. 1, font such as Fig. 2 and T font as shown in Figure 3.
In the 3 kinds of modes torn, yi word pattern and font are torn suitable in layer of metal intensity relatively low, easily deform, and another layer of metal strength is higher, the situation that difficulty deforms; T font tears metallic composite all relatively low suitable in double layer of metal intensity, that easily deform.
When carrying out T font tear test at present, the non-tear portion of composite is free end, and the part torn is divided into being in the two ends of coaxial but contrary draw direction before tear test, and this part is perpendicular with non-tear portion. During tear test, separated two ends are clamped and fastened on the two ends chuck tearing cupping machine, wherein one end chuck is fixed, other end chuck loads and stretches, until the part that the T-shaped composite of this test is not torn all is layered and tears, the maximum, force recorded is the tear edge to measure.
But tearing in process actual, there is warpage in non-tearing part branch, and warpage degree is continually changing with the process of tearing, and testing result is extremely inaccurate. This is the difference owing to there is not intensity between same metal so that tearing in process in T font, each layer flow of metal is inconsistent, can cause originally being in the non-tear portion generation warpage vertical with tearing draw direction.
During due to intensity and the deformability of composite different metal layer metal tears different, each, the difference of putting of position (refers mainly to the higher metal of intensity and is in top or the relatively low metal of intensity is in top, because there is warpage to the metal direction that intensity is relatively low in the non-tearing part branch being in level, the existence of factor such as shown in Figure 4) so that the condition of test is all different every time. Even and if under same experimental condition, along with the carrying out torn, the warpage degree of non-tear portion is gradually increased, namely the whole warpage degree of non-tear portion of tearing in process is all at time changing, these all will cause that measurement result exists deviation, and result is inaccurate, and test is difficult to mutually compare every time.
It is therefore desirable to design a kind of T-shaped tear test mould and test method, when making composite do T-shaped tear test, T-shaped sample is made to be in the centre position of tension test machine grip holder all the time, it is prevented from non-tear portion generation warpage, and in the process of tearing, it is always maintained at the state perpendicular with the direction tearing stretching, so that tearing stretching uniformly, in order to guarantee test testing result accurate stable, test has strong comparability.
Summary of the invention
It is an object of the invention to provide a kind of T-shaped tear test mould and test method, so that when composite does T-shaped tear test, T-shaped sample is made to be in the centre position of tension test machine grip holder all the time, it is prevented from non-tear portion generation warpage, and in the process of tearing, is always maintained at the state perpendicular with the direction tearing stretching.
To achieve these goals, the invention provides a kind of T-shaped tear test mould, described mould includes:
Fixed guide part, has the tested T-shaped sample of placement and is not torn the gap of part, be used for leading straight T-shaped sample and be not torn part;
Elastic telescopic part, symmetrical two parts are arranged in the both sides of described fixed guide portion gap, and are connected with the both sides in described gap respectively, and two parts of this symmetry all can do elastic telescopic deformation.
A portion connects one end chuck tearing cupping machine when tearing, and another part connects the other end chuck tearing cupping machine when tearing. This elastic telescopic part for driving tested T-shaped sample to move to the direction stretched when tearing, and keeps tested T-shaped sample to be also always positioned at the centre position of testing machine two chuck in tear test process.
Further, described in above-mentioned mould, fixed guide part includes:
Leading straight roll wheel assembly, lead straight roller including what two rows were arranged symmetrically with, this two rows roller rolls the distance between face and defines described gap;
Fixed connecting plate, symmetrical two boards is respectively arranged the both sides leading straight roller in described two rows; Being respectively provided with two rows described in rotational support bottom described two boards and lead the ledge of straight roller, described two boards top connects a part for described elastic telescopic partial symmetry respectively.
Further, described two row's rollers are often arranged and are respectively arranged with three rollers, and interval is arranged.
Above-mentioned mould, described fixed guide part also includes connecting bolt group, connects, for adjustable distance, the two boards that described fixed connecting plate is symmetrical.
Above-mentioned mould, described in lead straight roll wheel assembly and also include bearing, rotate the ledge being fixed on described fixed connecting plate; Described roller axle journal is through described bearing and can rotate with described bearing.
Above-mentioned mould, described fixed connecting plate has through hole, for the two parts torn through tested T-shaped sample.
Above-mentioned mould, described elastic telescopic part includes:
Spring and top board, one end of wherein said spring is fixing with described top board to be connected, and the other end is fixing with described fixed connecting plate to be connected.
Two parts of described roof symmetric each chuck with cupping machine when tearing tension test is connected.
Further, described spring is hydraulic spring grease cup or common spring.
Above-mentioned mould, the number of springs of the every part of described two-part elastic telescopic part is 2, and interval is arranged.
What technical scheme provided carries out, according to above-mentioned mould, the method tested, comprises the following steps:
S1: prepare tested T-shaped sample, and be layered out the two parts being generally aligned in the same plane being perpendicular to non-tear portion in one end of this sample;
S2: the non-tear portion adjustment of described T-shaped sample is positioned in the gap of fixed guide part of described mould;
S3: two tensioning chucks of the Kong Bingyu cupping machine being each passed through on described fixed connecting plate by two parts that described T-shaped sample separates connect;
S4: two parts of described elastic telescopic partial symmetry are connected with two chucks of cupping machine respectively;
S5: utilize cupping machine to carry out tearing tension test.
T-shaped tear test mould provided by the invention and test method, so that when composite does T-shaped tear test, along with the carrying out of tear test can make tested T-shaped sample be in the centre position of tension test machine grip holder all the time, it is prevented from non-tear portion generation warpage, and in the process of tearing, is always maintained at the state perpendicular with the direction tearing stretching. This kind of test mould and test method ensure that the stable and accurate of test so that result of the test is reliable, and the comparability of each test is strong.
Accompanying drawing explanation
The yi word pattern that Fig. 1 is conventional tear test tears mode schematic diagram;
The font that Fig. 2 is conventional tear test tears mode schematic diagram;
The T font that Fig. 3 is conventional tear test tears mode schematic diagram;
T-shaped sample non-tear portion generation buckling deformation schematic diagram when Fig. 4 is conventional T-shaped tear test;
Fig. 5 is the structural representation utilizing the T-shaped tear test die test in technical solution of the present invention embodiment; And
Fig. 6 is the fixed guide part side-looking structural representation of the T-shaped tear test mould in technical solution of the present invention example.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so as to the advantage being more fully understood that the solution of the present invention and its various aspects. But, specific embodiments described below and embodiment are only descriptive purposes, rather than limitation of the present invention.
The invention provides a kind of T-shaped tear test mould, as it is shown in figure 5, described mould includes fixed guide part 1 and elastic telescopic part 2.
Fixed guide part 1, has the tested T-shaped sample of placement and is not torn the gap 10 of part, be used for leading straight T-shaped sample 3 and be not torn part 31, and keep described gap 10 to immobilize at the trial. Gap length in this part, depending on tested sample thickness, can adjust when clamping tested T-shaped sample.
Opposite face between two pieces of flat boards that the restriction of its intermediate gap 10 can be arranged by one group of parallel interval limits, it is possible to the face of rolling of the two row's rollers arranged by parallel interval limits. Certainly also can by realizing otherwise.
In order to limit the buckling deformation of the tested non-tear portion of T-shaped sample, the gap limiting tested T-shaped sample is little as far as possible so that can just fit in the top and bottom of the thickness direction of the restriction face in gap and tested T-shaped sample.
But in order to avoid the non-tear portion of T sample mobile restriction face with gap in gap produces frictional force when tearing stretching, the measurement result of stretching is finally torn in impact, the setting in gap should be tried one's best and do not extruded tested T-shaped sample, even and if so that have frictional force produce also little as much as possible, it is preferred that adopt parallel interval arrange two row rollers face of rolling to limit the gap of tested T-shaped sample.
Elastic telescopic part 2, is made up of symmetrical two parts, and these two parts are arranged in the both sides of described fixed guide portion gap 10, and are connected with the both sides in this gap 10 respectively. A portion connects one end chuck tearing cupping machine when tearing, and another part connects the other end chuck tearing cupping machine when tearing.
Elastic telescopic part 2 for driving tested T-shaped sample to move to the direction stretched when tearing, and keeps tested T-shaped sample to be also always positioned at the centre position of testing machine two chuck in tear test process. This is because the tensioning chuck in cupping machine one end is motionless, the tensioning chuck of the other end move when tearing stretching, should make the non-tear portion of T-shaped sample is the half of stretching-machine tensioning chuck displacement towards the distance that draw direction moves, the tested T-shaped sample of guarantee is also always positioned at the centre position of testing machine two chuck in tear test process, and non-tear portion keeps vertical with tear portion. This can be interpreted as follows:
When T-shaped sample tear portion is torn out distance a, the separated two parts of tear portion respectively extend a length, namely the distance of general extension 2a on vertical with non-tear portion draw direction, because one end chuck of testing machine is secured, so this end of testing machine tensioning chuck moves the length of 2a.
And the part that T-shaped sample is not torn is connected with the tensioning chuck of cupping machine, make this not be torn part and move the length of a, then this part should be connected with tensioning chuck elasticity respectively with the fixed chuck of cupping machine, and the flexible member on both sides should be identical so that the elongation strain of two parts flexible member is identical. Namely the flexible member that T-shaped sample connects is in the stretching direction with tensioning chuck general extension 2a distance, and symmetry equivalent both sides flexible member respectively extends the distance of a, and the tested T-shaped sample being in flexible member mid portion just only moves the distance of a length naturally. This ensures that there tested T-shaped sample and be also always positioned at the centre position of testing machine two chuck in tear test process, and non-tear portion keeps vertical with tear portion. Thus be elastic telescopic part this partial design of the mobile tested non-tear portion of T-shaped sample.
Further, described in above-mentioned mould, fixed guide part includes:
Leading straight roll wheel assembly 11, lead straight roller 111 including what two rows were arranged symmetrically with, this two rows roller rolls the distance between face and defines described gap 10;
Fixed connecting plate 12, including symmetrical two boards, this two boards is respectively arranged in the described both sides leading straight roll wheel assembly 11, and bottom described two boards, 121 are respectively provided with the two symmetrical ledge 1211 leading straight roller of row described in rotational support, as shown in Figure 6.Described two boards top 122 connects a part for described elastic telescopic part 2 symmetry respectively.
Further, described two row's rollers are often arranged and are respectively arranged with three rollers 1111, and interval is arranged. But these data are not necessarily, can arbitrarily set the number of roller.
Above-mentioned mould, described fixed guide part 1 also includes connecting bolt group, connects the two boards of described fixed connecting plate 12 symmetry for adjustable distance. This bolt group is not shown in the drawings.
Above-mentioned mould, described in lead straight roll wheel assembly 11 and also include bearing, bearing rotates ledge 1211 place being fixed on described fixed connecting plate 12, and described roller 1111 axle journal also can rotate with described bearing through described bearing. Bearing is also not shown in the drawings.
Above-mentioned mould, if described fixed connecting plate 12 is longer in the length of T-shaped sample this end of tear portion, each in lower plate thereon can open hole, for the two parts torn through tested T-shaped sample.
Above-mentioned mould, described elastic telescopic part 2 is symmetrical two parts, and every part includes:
Spring 21 and top board 22, one end 211 of wherein said spring 21 is fixing with described top board 22 to be connected, and the other end 212 is fixing with described fixed connecting plate 12 to be connected. The top board 22 of described symmetry each chuck with cupping machine when tearing tension test is connected.
Further, described spring 21 is hydraulic spring grease cup or common spring. Certainly this is more common spring, and the kind of spring is extremely many, can select other types of springs according to practical situation, such as disc spring group etc.
Above-mentioned mould, the number of springs of the every part of the two-part elastic telescopic part of described symmetry 2 is 2, and interval is arranged in the side of described top board 22. Certainly the setting of this quantity nor is it necessary that. So that steadily, identical spring can be arranged in interval along T-shaped specimen length direction when the whole length of the non-tear portion of T-shaped sample moving towards draw direction when tearing stretching. When the number of springs of every partial elastic telescopic section 2 is more than 1, should ensure that the flush with portions that fixed connecting plate is connected with this partial spring, in order to avoid the non-tear portion of T-shaped sample is perpendicular in the whole length of draw direction and moves imbalance when tearing stretching.
The T-shaped tear test mould that present invention described above provides, so that when composite does T-shaped tear test, it is prevented from non-tear portion generation warpage, and be always maintained at the state perpendicular with the direction tearing stretching in the process of tearing, and along with the carrying out of tear test can make tested T-shaped sample be in the centre position of tension test machine grip holder all the time.
What technical scheme provided carries out, according to above-mentioned mould, the method tested, comprises the following steps:
S1: prepare tested T-shaped sample, and be layered out the two parts being generally aligned in the same plane being perpendicular to non-tear portion in one end of this sample;
S2: the non-tear portion adjustment of described T-shaped sample is positioned in the gap of fixed guide part of described mould;
S3: two tensioning chucks of the Kong Bingyu cupping machine being each passed through on described fixed connecting plate by two parts that described T-shaped sample separates connect;
S4: two parts of described elastic telescopic partial symmetry are connected with two chucks of cupping machine respectively;
S5: utilize cupping machine to carry out tearing tension test.
Specifically carry out tearing tension test, be explained as follows with reference to accompanying drawing 5, Fig. 6.
Tested metallic composite selects 0.8mm aluminium lamination and 0.8mm stainless steel composite material, and specimen width is 10mm, length 200mm.
After tested composite is ready to, sample is processed into T font sample. Composite sample one end is layered as two parts, and these two parts are generally aligned in the same plane interior and vertical with non-layered portion i.e. non-tear portion 31, i.e. the tear portion of on-test layered and the T-shaped shape of non-tear portion.
In case the non-tear portion 31 of T-shaped sample deforms during tear test, non-for T-shaped sample tear portion 31 is loaded in the gap 10 of fixed guide part 1 of above-mentioned mould, and adjust gap 10 and be sized such that tested T-shaped sample 3 is not produced extruding by the roller 1111 of fixed guide part 1.
Cupping machine is utilized to carry out the T-shaped tear test of composite. The two ends that the two ends chuck of cupping machine is layered with ready tested T-shaped sample 3 respectively are connected, and allow the two ends of layering be each passed through the through hole on the fixed connecting plate 12 of above-mentioned mould.
Simultaneously, two parts of described elastic telescopic partial symmetry are connected with two chucks of cupping machine respectively, namely two pieces of symmetrical tops 22 are connected respectively the chuck of the fixing chuck of cupping machine and stretching, this connection can be passed through the simple tool such as rope band, chain and top 22 and testing machine chuck binding or have contact with is connected, it is possible to the special connection fixture that makes is attached. But so that the non-tear portion 31 of T-shaped sample is steady along the movement of draw direction when tearing stretching, the whole length of non-tear portion keeps balance, it is desirable to during connection, junction point is located at the middle part of top board.
Cupping machine wherein one end chuck is fixed, and other end chuck loads and stretches.
Tear in drawing process, the non-tear portion of T-shaped sample removes the gap of the fixed guide part in above-mentioned mould gradually along with the carrying out tearing stretching, while movement, friction that the roller of upper and lower both sides, gap can produce thereon along with the movement of T-shaped sample and rotate, but because this force of rolling friction is minimum, it is negligible measuring tear edge.
T-shaped tear test mould drives T-shaped sample to move towards draw direction along with the movement of tensioning chuck, wherein, fixed guide part 1 entirety and non-tear portion 31 shift invariant in the stretching direction, and two parts of elastic telescopic part 2 symmetry are respectively further from non-tear portion 31 in the stretching direction and move. Meanwhile, in the two ends of T-shaped sample tear portion, wherein one end is motionless because fixing with fixed chuck, and the other end moves towards draw direction along with tensioning chuck.
When finally tearing stretching end, whole T-shaped sample is torn as two parts, namely T-shaped sample is not torn part 31 and is all torn out yet, and now the non-tear portion of T-shaped sample is all out of the gap 10 of the fixed guide part 1 of tear test mould, and T-shaped sample has had disengaged from T-shaped tearing mould.
The average tension of Tensile Test Tensile chuck will be torn, deduct the elastic deformation force in elastic telescopic part, be the tear edge recorded. Wherein elastic deformation force can obtain with the Rigidity Calculation of itself according to the elastic displacement recorded, i.e. F=A*S, wherein F is elastic deformation force, and A is spring rate, and S is elastic displacement.
The T-shaped tear test mould of the embodiment of the present invention and test method, so that when composite does T-shaped tear test, along with the carrying out of tear test can make tested T-shaped sample be in the centre position of tension test machine grip holder all the time, it is prevented from non-tear portion generation warpage, and in the process of tearing, it is always maintained at the state perpendicular with the direction tearing stretching, this kind of test mould and test method ensure that the stable and accurate of test so that result of the test is reliable, and the comparability of each test is strong.
Last it is noted that obvious, above-described embodiment is only for clearly demonstrating example of the present invention, and is not the restriction to embodiment. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without also cannot all of embodiment be given exhaustive. And the apparent change thus amplified out or variation are still among protection scope of the present invention.
Claims (10)
1. a T-shaped tear test mould, it is characterised in that described mould includes
Fixed guide part, has the tested T-shaped sample of placement and is not torn the gap of part, be used for leading straight T-shaped sample and be not torn part;
Elastic telescopic part, symmetrical two parts are arranged in the both sides of described fixed guide portion gap, and are connected with the both sides in described gap respectively, and two parts of this symmetry all can do elastic telescopic deformation.
2. mould according to claim 1, it is characterised in that described fixed guide part includes
Leading straight roll wheel assembly, lead straight roller including what two rows were arranged symmetrically with, this two rows roller rolls the distance between face and defines described gap;
Fixed connecting plate, symmetrical two boards is respectively arranged the both sides leading straight roller in described two rows; Being respectively provided with two rows described in rotational support bottom described two boards and lead the ledge of straight roller, described two boards top connects a part for described elastic telescopic partial symmetry respectively.
3. mould according to claim 2, it is characterised in that described two row's rollers are often arranged and are respectively arranged with three rollers, and interval is arranged.
4. mould according to claim 2, it is characterised in that described fixed guide part also includes connecting bolt group, connects, for adjustable distance, the two boards that described fixed connecting plate is symmetrical.
5. mould according to claim 2, it is characterised in that described in lead straight roll wheel assembly and also include bearing, rotate the ledge being fixed on described fixed connecting plate; Described roller axle journal is through described bearing and can rotate with described bearing.
6. mould according to claim 1 and 2, it is characterised in that have through hole on described fixed connecting plate, for the two parts torn through tested T-shaped sample.
7. mould according to claim 1 and 2, it is characterised in that described elastic telescopic part includes
Spring and top board, one end of wherein said spring is fixing with described top board to be connected, and the other end is fixing with described fixed connecting plate to be connected.
8. mould according to claim 7, it is characterised in that described spring is hydraulic spring grease cup or common spring.
9. the mould according to claim 1 or 7, it is characterised in that the number of springs of the every part of described two-part elastic telescopic part is 2, and interval is arranged.
10. the method for the die test described in any one of claim 1 to 9, it is characterised in that said method comprising the steps of:
S1: prepare tested T-shaped sample, and be layered out the two parts being generally aligned in the same plane being perpendicular to non-tear portion in one end of this sample;
S2: the non-tear portion adjustment of described T-shaped sample is positioned in the gap of fixed guide part of described mould;
S3: two tensioning chucks of the Kong Bingyu cupping machine being each passed through on described fixed connecting plate by two parts that described T-shaped sample separates connect;
S4: two parts of described elastic telescopic partial symmetry are connected with two chucks of cupping machine respectively;
S5: utilize cupping machine to carry out tearing tension test.
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| CN109406317A (en) * | 2017-08-16 | 2019-03-01 | 中国石油化工股份有限公司 | A kind of test device and method of film machine direction tear |
| CN109406317B (en) * | 2017-08-16 | 2024-04-12 | 中国石油化工股份有限公司 | Device and method for testing longitudinal tearing strength of film |
| CN108152129A (en) * | 2017-11-20 | 2018-06-12 | 河南工业大学 | A kind of thin wall flexible layers of material tear test device and its test method |
| CN108152129B (en) * | 2017-11-20 | 2020-05-05 | 河南工业大学 | Thin-wall flexible material layered tearing test device and test method thereof |
| CN108827667A (en) * | 2018-07-20 | 2018-11-16 | 常州市新创智能科技有限公司 | A kind of curved face type fatigue batten detection device |
| CN108827667B (en) * | 2018-07-20 | 2024-04-23 | 常州市新创智能科技有限公司 | Curved surface type fatigue spline detection device |
| CN110406676A (en) * | 2019-07-22 | 2019-11-05 | 航宇救生装备有限公司 | A kind of protective device for preventing air-dropped material from damaging |
| CN111060448A (en) * | 2019-12-19 | 2020-04-24 | 中航复合材料有限责任公司 | Fixture tool and stripping tester with fixture tool matched with fixture tool |
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