CN119985036B - Test piece fastening device for structural sealant fatigue cycle test and use method - Google Patents
Test piece fastening device for structural sealant fatigue cycle test and use methodInfo
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- CN119985036B CN119985036B CN202510159451.8A CN202510159451A CN119985036B CN 119985036 B CN119985036 B CN 119985036B CN 202510159451 A CN202510159451 A CN 202510159451A CN 119985036 B CN119985036 B CN 119985036B
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Abstract
The invention provides a test piece fastening device for structural sealant fatigue cycle test and a use method thereof, the fastening device consists of an upper clamping strip and a lower clamping strip, wherein the upper clamping strip and the lower clamping strip are both strip-shaped, the middle part is a clamping part, and the two ends are connecting parts. During testing, two ends of the joint surfaces of the two test pieces are respectively fixed by the two pairs of upper clamping strips and the lower clamping strips to form a first fastening piece, then the test pieces are placed above or below the first fastening piece to be fixed, and finally the formed fastening piece is placed on a test fixture to be fixed. When the invention is adopted to repeatedly stretch a group of test pieces in a reciprocating way, the stress concentration of the test pieces is avoided.
Description
Technical Field
The invention belongs to the technical field of material testing devices, and particularly relates to a testing device and a using method thereof.
Background
The structural sealant is a high-performance engineering material widely applied to the fields of assembly type buildings, building curtain walls and the like, and is mainly used for bonding and sealing key nodes and fine gaps of building structures. The material plays a role in transferring load and sealing in application, and the structural sealant must bear certain pressure and deformation due to the long-term dead weight, wind and other load effects of the building, so that the structural integrity and the tightness are ensured. Therefore, the fatigue cycle resistance of the material is of great importance, and has important practical significance for guiding research, development and production of production enterprises, actual engineering construction and engineering maintenance.
At present, the method for using the anti-fatigue circulation performance of the structural sealant is mainly carried out according to JG/T475-2015 'Silicone structural sealant for building curtain walls', wherein a group of test pieces are taken to be repeatedly stretched, and fatigue circulation treatment is carried out by taking 8s as a period. The key element of the fatigue resistance cycle performance test is to fasten and reliably restrict the test piece, so that stress concentration of the test piece in the repeated tensile test process is avoided. We summarize and find that the test piece fastening constraint device with reasonable structure and reliable performance is lacking at present, and it is difficult to realize high-efficiency anti-fatigue cycle performance test on a group of test pieces with high quality. In addition, the test fixture for testing the tensile adhesion of the H-shaped test piece in the existing building sealing material test method GB/T13477.8-2017 can only realize single tensile stress and can not meet the technical requirement of repeatedly stretching a group of test pieces back and forth during fatigue cycle test.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the test piece fastening device for the structural sealant fatigue cycle test and the use method thereof, and the stress concentration of the test pieces is avoided when a group of test pieces are repeatedly stretched back and forth in the fatigue cycle test.
The invention discloses a test piece fastening device for structural sealant fatigue cycle test, which comprises an upper clamping strip and a lower clamping strip, wherein the upper clamping strip and the lower clamping strip are both strip-shaped, the middle is a clamping part for clamping a test piece, and the two ends of the clamping strip are connecting parts for connecting the upper clamping strip and the lower clamping strip.
Further, the clamping part is lower than the connecting part to form a groove shape, the depth of the groove is smaller than half of the sum of the thicknesses of the glass substrate and the aluminum/glass substrate, the connecting part is provided with a threaded hole, and the threaded hole of the upper clamping strip is a countersunk threaded hole.
Further, the upper clip strip and the lower clip strip are both made of aluminum.
In a second aspect, the present invention also discloses a method for using the foregoing device, including:
step one, the glass substrate of a first to-be-tested sealant test piece and a second to-be-tested sealant test piece are horizontally upwards placed, the aluminum/glass substrate of the second to-be-tested sealant test piece is aligned and attached to the glass substrate of the first to-be-tested sealant test piece, and two pairs of upper clamping strips and lower clamping strips are used for fixing the two ends of the attaching surfaces of the first to-be-tested sealant test piece and the second to-be-tested sealant test piece respectively to form a first fastener.
A third sealant test piece to be tested is placed at the upper end or the lower end of the first fastener in an aligned mode, a glass substrate of the third sealant test piece to be tested is placed upwards, and the third sealant test piece to be tested is fixed with the first fastener by using the upper clamping strip and the lower clamping strip in the same mode as the second step to form a second fastener;
Step three, repeating the step two, and fixing N+1 sealant test pieces to be tested together to form an N fastener, wherein N is not less than 1;
And fourthly, placing the Nth fastening piece on a test fixture, and fixing the Nth fastening piece on the test fixture by using a bolt.
Further, before fixing the upper clip strip and the lower clip strip, the upper clip strip and the lower clip strip are pre-mounted by bolts, and a gap is formed between the connecting parts of the upper clip strip and the lower clip strip after the pre-mounting.
Further, in the fourth step, a hard rubber plate and a metal plate are placed on the upper and lower surfaces of the nth fastener, the metal plate on the upper surface is located above the hard rubber plate, and the metal plate on the lower surface is located below the hard rubber plate.
Further, N is 4.
The beneficial effects are that:
The fastening device provided by the invention comprises the upper clamping strip and the lower clamping strip, a group of fatigue test pieces can be connected in series, and in a series system, the bearing force of each test piece is the same, so that the high stress originally concentrated at a certain part is dispersed to each test piece in series, the stress born by the test piece in the test process is effectively dispersed, the stress concentration phenomenon is avoided, the accuracy and the reliability of the test result are improved, and a new effective solution is provided for the field of fatigue test of structural sealant.
The fastening device has wide applicability, can be used for fatigue cycle test of structural sealant, can also be used for tensile-compression cycle test of a group of structural sealant according to the test flow and parameters of standard GB/T13477.12-2018, and saves time and cost.
On the other hand, the using method of the fastening device provided by the invention only uses the upper clamping strip and the lower clamping strip for connection, the using method is simple, no complex installation and debugging process is needed, and an operator can quickly carry out the test operation by hands.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
FIG. 1 is a physical diagram of a fixture tank for testing a group of test pieces in parallel;
FIG. 2 is a front view and a top view of upper and lower clip strips according to embodiment 1 of the present invention;
(a) Upper holding strip (b) and lower holding strip
FIG. 3 is a front view of pre-installed upper and lower clip strips of embodiment 2 of the present invention;
FIG. 4 is a front three-dimensional view showing the fixing of two test pieces according to example 2 of the present invention;
FIG. 5 is a front view of the two test pieces of example 2 of the present invention after being fixed;
FIG. 6 is a front view of a first fastener of embodiment 2 of the present invention;
FIG. 7 is a front view of a second fastener of embodiment 2 of the present invention;
FIG. 8 is a front view of a third fastener of embodiment 2 of the present invention;
FIG. 9 is a front view of a fastener of embodiment 2 of the present invention;
fig. 10 is a front view of the fastener of embodiment 2 of the present invention mounted on a test fixture.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. The principles and features of the present application are described below with reference to the drawings, and it should be noted that embodiments of the present application and features of the embodiments may be combined with each other without conflict. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the application.
JG/T475-2015 silicone structural sealant for building curtain walls prescribes the shape, size and base material of a sealant test piece to be tested. The base materials can be AL type, G type and M type, wherein the AL type meets the requirements of GB/T13477.1, the thickness of the anodized aluminum is not less than 3mm, the G type meets the requirements of GB/T13477.1, the base materials are clean and non-coated float glass, and the thickness of the base materials is not less than 5mm, and the M type is other metal base materials with the requirements of a supplier. One surface of the sealant test piece to be tested is a glass substrate, the other surface of the sealant test piece to be tested is an aluminum/glass substrate, and the middle of the sealant test piece to be tested is sealant.
Example 1
When the fatigue resistance and the cycle performance are tested according to JG/T475-2015 silicone structural sealant for building curtain walls, a group of test pieces are required to be repeatedly stretched. In a specific test, since a plurality of test pieces have the same shape, in order to stretch a plurality of test pieces at the same time, a person skilled in the art has generally adopted to "connect in parallel" a plurality of test pieces and then place the test pieces in a fixture groove for testing, as shown in fig. 1.
In theory, the efficiency of testing in this manner is high, but those skilled in the art are not aware that the dimensions of the shapes of the test pieces are not guaranteed to be completely consistent, errors exist in the dimensions of the clamp grooves for mounting each test piece, or improper use of the clamp can result in stress concentration on the test piece with the smallest dimension in the tensile direction during testing.
After the technical problem to be solved by the anti-fatigue cycle performance test is found, in order to overcome the defects of the prior art, the method is taught in the construction sealing material test method GB/T13477.8-2017 for testing the tensile adhesion of an H-shaped test piece, but the method is a single test piece test, only single tensile stress can be carried out on the test piece during the test, and the method is not suitable for the scene of the problem.
The invention provides a technical scheme of connecting a group of test pieces in series, wherein in a series system, the force born by each test piece is the same, so that high stress which is possibly concentrated at a certain position is dispersed to each test piece connected in series.
It should be pointed out that, in order to describe the technical solution of the invention more vividly, the words parallel and series are adopted. In fact, one skilled in the art does not know this word when using a set of test pieces to place in a fixture slot for testing. They certainly consider that the manner of placing a plurality of test pieces should obviously be placed side by side in the jig groove so as to simultaneously stretch the plurality of test pieces. Therefore, the proposal of the technical proposal of the invention can not carry out simple association and conversion from parallel connection to serial connection as in other fields.
Moreover, even if a serial connection mode is conceived, it is first required to solve how to fasten a plurality of test pieces in series, and the uneven stress of each test piece is not caused by the fastening connection mode.
The embodiment of the invention firstly provides a test piece fastening device for a structural sealant fatigue cycle test, which comprises an upper clamping strip and a lower clamping strip, as shown in fig. 2, wherein the upper clamping strip and the lower clamping strip are both strip-shaped, the middle part of the upper clamping strip and the lower clamping strip is a clamping part for clamping a test piece, and the two ends of the upper clamping strip and the lower clamping strip are connected by connecting parts.
The clamping part is lower than the connecting part to form a groove shape, the sum of the groove depths of the upper clamping strip and the lower clamping strip is smaller than the sum of the thicknesses of the glass substrate and the aluminum/glass substrate, and the clamping effect is achieved during installation. The connecting portion is provided with a threaded hole, and the threaded hole of the upper clamping strip is a countersunk threaded hole.
Preferably, the upper clip strip and the lower clip strip are both aluminium clip strips.
The test piece fastening device provided by the embodiment of the invention adopts the upper clamping strip and the lower clamping strip, has a simple structure, can firmly fix each test piece connected in series, ensures that the test piece is uniformly stressed, and avoids generating new stress concentration.
Example 2
This embodiment is a method of using the fastening device of embodiment 1, the method comprising the steps of:
step 1, firstly, arranging two aluminum clamping strips in order from top to bottom, and slightly fixing two ends by using matched bolts, wherein the two ends are shown in fig. 3;
And 2, as shown in fig. 4 and 5, taking two to-be-tested sealant test pieces, horizontally upwards and vertically aligning and placing the glass substrate, placing a fastening device which is slightly fixed in advance at one end of the contact surface of the first to-be-tested sealant test piece and the second to-be-tested sealant test piece, adjusting the positions of bolts at two ends, and then rotating a screw to fasten.
And 3, similarly, placing another slightly fixed fastening device at the other end of the contact surface of the first to-be-tested sealant test piece and the second to-be-tested sealant test piece, adjusting the positions of bolts at two ends, and fastening by rotating a screw to form a first fastening piece, wherein the first fastening piece is shown in fig. 6.
And 4, taking a third sealant test piece to be tested, horizontally upwards and vertically aligning and placing the glass substrate at the upper end of the first fastener, placing a fastening device which is slightly fixed in advance at one end of the contact surface of the second sealant test piece to be tested and the third sealant test piece to be tested, and adjusting the positions of bolts at two ends until the positions of bolts at two ends reach one end of the fastening constraint test piece. Similarly, the slightly fixed fastening device is placed on the other end of the contact surface of the second to-be-tested sealant test piece and the third to-be-tested sealant test piece, the positions of the bolts at the two ends are adjusted to the other end of the fastening constraint test piece, and a second fastening piece is formed, as shown in fig. 7.
And 5, taking a fourth sealant test piece to be tested, and fixing the fourth sealant test piece to be tested to the upper part of the second fastening piece by using a fastening device according to the flow of the step 4 to form a third fastening piece, wherein the third fastening piece is shown in fig. 8.
And 6, taking a fifth to-be-tested sealant test piece, and fixing the fifth to-be-tested sealant test piece to the upper part of the third fastener by using a fastening device according to the process of the step 4 to form a final fastener 4, as shown in fig. 9.
Step 7, placing the assembled fourth fastener on the test fixture 1, wherein the test fixture 1 can perform fatigue test. A layer of hard rubber plate 3 and a layer of metal plate 2 are placed on the upper and lower surfaces of the test piece, and finally the whole fastener 4 is fixed on the test fixture 1 by using bolts, see fig. 1.
The metal plate 2 on the upper surface of the fastener 4 is located above the hard rubber plate 3, and the metal plate 2 on the lower surface is located below the hard rubber plate 3.
Of course, the upper holding strip and the lower holding strip can be directly arranged at the contact surface of the two test pieces without being slightly fixed in advance, and the fixing can be realized, but the operation is inconvenient.
The using method of the embodiment is easy to operate, and a group of test pieces can be repeatedly stretched back and forth during fatigue cycle test, so that stress concentration of the test pieces in the repeated stretching test process is avoided.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
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| CN202510159451.8A CN119985036B (en) | 2025-02-13 | 2025-02-13 | Test piece fastening device for structural sealant fatigue cycle test and use method |
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| CN202510159451.8A CN119985036B (en) | 2025-02-13 | 2025-02-13 | Test piece fastening device for structural sealant fatigue cycle test and use method |
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| CN204221668U (en) * | 2014-11-25 | 2015-03-25 | 中国建材检验认证集团苏州有限公司 | A kind of frock clamp for two pieces of folded I shape modules of establishing are fixed |
| CN115078076A (en) * | 2022-06-29 | 2022-09-20 | 中国航发北京航空材料研究院 | SiC f High-throughput testing clamp and method for tensile ratio limit of/SiC composite material |
| CN222028148U (en) * | 2023-12-28 | 2024-11-19 | 广州集泰化工股份有限公司 | A sealant bonding performance tensile compression fatigue test fixture |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101406377B1 (en) * | 2012-12-27 | 2014-06-16 | 재단법인 포항산업과학연구원 | Seawater erosion fatigue test system |
| CN114112677B (en) * | 2021-12-04 | 2025-02-28 | 上海百若试验仪器有限公司 | A tool for continuous tensile testing of multiple specimens and its use method |
| CN117782798A (en) * | 2023-12-29 | 2024-03-29 | 华北电力大学 | Multi-sample series high-temperature creep test fixture for hot chamber and test method |
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- 2025-02-13 CN CN202510159451.8A patent/CN119985036B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204221668U (en) * | 2014-11-25 | 2015-03-25 | 中国建材检验认证集团苏州有限公司 | A kind of frock clamp for two pieces of folded I shape modules of establishing are fixed |
| CN115078076A (en) * | 2022-06-29 | 2022-09-20 | 中国航发北京航空材料研究院 | SiC f High-throughput testing clamp and method for tensile ratio limit of/SiC composite material |
| CN222028148U (en) * | 2023-12-28 | 2024-11-19 | 广州集泰化工股份有限公司 | A sealant bonding performance tensile compression fatigue test fixture |
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