CN113125216A - Method for reinforcing end part of test piece - Google Patents
Method for reinforcing end part of test piece Download PDFInfo
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- CN113125216A CN113125216A CN202010041029.XA CN202010041029A CN113125216A CN 113125216 A CN113125216 A CN 113125216A CN 202010041029 A CN202010041029 A CN 202010041029A CN 113125216 A CN113125216 A CN 113125216A
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- test piece
- adhesive
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- reinforcing
- end part
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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Abstract
The invention discloses a method for reinforcing the end part of a test piece, which belongs to the field of test piece reinforcing methods and comprises the following steps: s1: injecting an adhesive into a sleeve, wherein the sleeve is vertically arranged; s2: placing the first end of the test piece in the adhesive in the sleeve until the adhesive is cured to connect the test piece and the sleeve into a whole; s3: and injecting an adhesive into the other vertically arranged sleeve, and placing the second end of the test piece into the adhesive of the other sleeve until the adhesive is cured to connect the test piece and the other sleeve into a whole. The sleeve is adhered to the end part of the test piece through the adhesive, so that the end part strength of the test piece is improved, and the test piece can realize an effective failure mode of 'middle failure and intact end part'. The method for reinforcing the end part of the test piece is simple and convenient to operate and is suitable for test pieces with end parts of different shapes.
Description
Technical Field
The invention relates to a method for reinforcing a test piece, in particular to a method for reinforcing an end part of a composite material test piece.
Background
The fiber reinforced composite material has the advantages of high specific modulus, low specific gravity, designability and the like, and is widely applied to the fields of aviation, aerospace and the like. Composite parts, such as stringers, multi-ribbed panels, etc., are subjected to various loads, and therefore, strength tests are required for test pieces to evaluate the safety and reliability of the test pieces.
In a specific test experiment, a preset failure mode needs to be obtained for a test piece, so that the validity of experimental data is ensured. However, due to the structural characteristics of the fiber reinforced composite material, the end of the test piece is easy to be split and damaged in the test experiment, which affects the accuracy and reliability of the experimental data. In the prior art, a method of attaching a reinforcing piece to an end portion of a test piece is often used for reinforcing the end portion. However, the stress concentration of the test piece is often caused by the limitation of the shape of the test piece, so the method of attaching the reinforcing sheet to the end part cannot ensure that the end part of the test piece is intact under the pressed state. Moreover, for large-size structural members or full-size parts, the reinforcing effect of the reinforcing sheet is limited, and the effective damage mode of middle damage and intact end parts of the test piece in the test process can not be guaranteed.
Therefore, a method for reinforcing the end of the test piece is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for reinforcing the end part of a test piece, so that the test piece can achieve an effective failure mode of 'middle failure and intact end part' in the test process, and the method is suitable for test pieces with end parts of different shapes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method of reinforcing a test piece end, comprising the steps of:
s1: injecting an adhesive into a sleeve, wherein the sleeve is vertically arranged;
s2: placing the first end of the test piece in the adhesive in the sleeve until the adhesive is cured to connect the test piece and the sleeve into a whole;
s3: and injecting an adhesive into the other vertically arranged sleeve, and placing the second end of the test piece into the adhesive of the other sleeve until the adhesive is cured to connect the test piece and the other sleeve into a whole.
Further, when the first end or the second end of the test piece is placed in the adhesive in the corresponding sleeve, the test piece is clamped and fixed by using a clamp.
Further, the thickness of the adhesive between the test piece and the sleeve is greater than or equal to 1 cm.
Further, the adhesive is prepared by mixing epoxy resin glue and a hardening agent according to a first preset weight proportion.
Further, the first preset weight proportion is 2/1-5/1.
Furthermore, a reinforcing material is added into the adhesive, the adhesive and the reinforcing material are mixed according to a second preset weight proportion, and the second preset weight proportion is 1/1-5/1.
Further, the reinforcing material is quartz sand.
Further, the S3 is followed by S4: and respectively processing the first end and the second end.
Further, after placing the first end or the second end of the test piece in the adhesive in the corresponding sleeve, the method further comprises: standing at room temperature for a first preset time, or baking at a preset temperature for a second preset time to cure the adhesive.
Further, the sleeve is made of aluminum alloy or alloy steel.
The invention has the beneficial effects that:
according to the method for reinforcing the end part of the test piece, the sleeve is adhered to the end part of the test piece through the adhesive, so that the strength of the end part of the test piece is improved, and the test piece can achieve an effective failure mode of 'middle failure and intact end part' in the test process. And the reinforcing method is applicable to test pieces having ends of different shapes. According to the method for reinforcing the end part of the test piece, only the sleeve needs to be bonded with the end part of the test piece, the process is simple, and the operation is simple and convenient. In addition, compared with the prior art, the reinforcing method adopts cheap and easily available materials, and reduces the processing cost.
Drawings
FIG. 1 is a flow chart of a method for reinforcing a test piece end according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for reinforcing the end of the test piece according to the second embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
When a test piece is used for a test experiment, the end part of the test piece is easy to split and damage, so that the accuracy and reliability of experimental data are affected, and therefore the test piece is required to be ensured to be capable of realizing a preset damage mode. For large-size structural members or full-size parts, the reinforcing effect of the reinforcing sheet is limited, and the effective damage mode of middle damage and intact end parts of a test piece in the test process can not be guaranteed.
To solve the above problem, as shown in fig. 1, the present embodiment discloses a method for reinforcing an end portion of a test piece, which includes: s1: injecting adhesive into a sleeve, wherein the sleeve is vertically arranged, and S2: placing the first end of the test piece in the adhesive in the sleeve until the adhesive is cured to connect the test piece and the sleeve into a whole, S3: and injecting an adhesive into the other vertically arranged sleeve, and placing the second end of the test piece into the adhesive of the other sleeve until the adhesive is cured to connect the test piece and the other sleeve into a whole.
According to the method for reinforcing the end part of the test piece, the sleeve is adhered to the end part of the test piece through the adhesive, so that the strength of the end part of the test piece is improved, and the test piece can achieve an effective damage mode of 'middle damage and intact end part' in the test process. And the reinforcing method is applicable to test pieces having ends of different shapes. According to the method for reinforcing the end part of the test piece, only the sleeve needs to be bonded with the end part of the test piece, the process is simple, and the operation is simple and convenient.
In order to improve the stability of the bonding between the end of the test piece and the sleeve, when the first end or the second end of the test piece is placed in the adhesive in the corresponding sleeve, the test piece is clamped and fixed by using a clamp. This anchor clamps only need can realize that the tip of test piece is fixed with the sleeve can, to the concrete structure or the size of anchor clamps, this embodiment does not specifically limit.
It should be noted that the thickness of the adhesive between the test piece and the sleeve is 1cm or more to ensure a firm adhesion between the test piece and the sleeve. It can be understood that when the thickness of the adhesive between the test piece and the sleeve is less than 1cm, the stability of the bonding of the test piece and the sleeve is poor.
After the first end or the second end of the test piece is placed in the adhesive in the corresponding sleeve, the curing process of the adhesive is divided into two modes of room temperature curing and heating curing. The room temperature curing needs to be carried out at room temperature for a first preset time to cure the adhesive, and the first preset time is forty-eight hours. It is understood that the first preset time may also be greater than forty-eight hours. The heating curing needs to be performed for a second preset time in an environment with a temperature of sixty ℃ so as to cure the adhesive, and the second preset time is not less than two hours.
In the embodiment, the adhesive is preferably a two-component epoxy resin adhesive sold on the market, namely an AB adhesive, and the adhesive is cheap and easy to obtain, so that the processing cost is reduced while the bonding effect is ensured.
Specifically, the adhesive is prepared by mixing an epoxy resin adhesive and a hardening agent according to a first preset weight proportion, and the first preset weight proportion is 2/1-5/1. It is understood that the composition ratio of the adhesive may be set to other weight ratios, but the bonding effect may be deteriorated.
In order to improve the strength of the adhesive, a reinforcing material is added into the adhesive, and the adhesive and the reinforcing material are mixed according to a second preset weight proportion, wherein the second preset weight proportion is 1/1-5/1. The adhesive and reinforcement were mixed well using a motor stirrer and then poured into the sleeve as soon as possible.
Specifically, the specific operation process of the test piece end reinforcing method is as follows:
first, a sleeve is manufactured to match the shape of the end of the test piece. It should be noted that when the end of the test piece is large in size, the sleeve is obtained by machining the aluminum alloy and alloy steel materials; when the end of the test piece is small in size, a commercially available aluminum pipe or steel pipe can be selected and cut to obtain a sleeve. Then, the adhesive is prepared according to a first preset weight proportion, and then the adhesive and the reinforcing material are fully stirred according to a second preset weight proportion to be uniformly mixed. The sleeve is vertically placed, the adhesive is injected into the sleeve, the first end of the test piece is vertically placed into the adhesive in the sleeve, and the sleeve and the test piece are fixed through the practical fixture. And selecting room temperature standing or heating standing according to actual working conditions until the adhesive is cured so as to connect the first end of the test piece and the sleeve into a whole.
And then repeating the steps on the second end of the test piece, and connecting the second end of the test piece and the sleeve into a whole.
In the embodiment, the reinforcing material is preferably, but not limited to, quartz sand, which is cheap and easy to obtain, so that the processing cost of the method can be reduced. In other embodiments, the reinforcing material may also be aluminum powder or the like.
It should be noted that the sleeve is made of aluminum alloy or alloy steel so that the end reinforcing effect of the test piece is better.
Example two
As shown in fig. 2, the present embodiment provides a method for reinforcing an end portion of a test piece, which further includes, on the basis of the first embodiment: the first end and the second end are separately machined.
Specifically, the flatness or parallelism of the end of the test piece to which the sleeve is bonded cannot meet the requirements of the test experiment, and therefore, the first end and the second end of the reinforced test piece need to be machined respectively until the flatness or the flatness of the test piece is met.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method of reinforcing an end of a test piece, comprising the steps of:
s1: injecting an adhesive into a sleeve, wherein the sleeve is vertically arranged;
s2: placing the first end of the test piece in the adhesive in the sleeve until the adhesive is cured to connect the test piece and the sleeve into a whole;
s3: and injecting an adhesive into the other vertically arranged sleeve, and placing the second end of the test piece into the adhesive of the other sleeve until the adhesive is cured to connect the test piece and the other sleeve into a whole.
2. A method of reinforcing an end portion of a test piece according to claim 1, wherein the test piece is held by a jig while the first end or the second end of the test piece is placed in the adhesive in the corresponding sleeve.
3. A method of reinforcing an end of a test piece according to claim 1, wherein the thickness of the adhesive between the test piece and the sleeve is 1cm or more.
4. A method of reinforcing a test piece end according to claim 1, wherein the adhesive is made by mixing an epoxy resin glue and a hardener in a first predetermined weight ratio.
5. The method of reinforcing a test piece end portion of claim 4, wherein the first predetermined weight ratio is 2/1-5/1.
6. The method for reinforcing the end of the test piece according to claim 1, wherein a reinforcing material is added to the adhesive, the adhesive and the reinforcing material are mixed in a second predetermined weight ratio, and the second predetermined weight ratio is 1/1-5/1.
7. A method of reinforcing an end of a test piece according to claim 6, wherein the reinforcing material is silica sand.
8. The method for reinforcing a test piece end portion of any one of claims 1 to 7, wherein the step S3 is followed by the step S4: and respectively processing the first end and the second end.
9. The method of reinforcing an end of a test piece of claim 1, further comprising, after placing the first or second end of the test piece in the adhesive within the corresponding sleeve: standing at room temperature for a first preset time, or baking at a preset temperature for a second preset time to cure the adhesive.
10. A method of reinforcing an end of a test piece according to claim 1, wherein the sleeve is made of an aluminum alloy or an alloy steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010041029.XA CN113125216A (en) | 2020-01-15 | 2020-01-15 | Method for reinforcing end part of test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010041029.XA CN113125216A (en) | 2020-01-15 | 2020-01-15 | Method for reinforcing end part of test piece |
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| Publication Number | Publication Date |
|---|---|
| CN113125216A true CN113125216A (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010041029.XA Pending CN113125216A (en) | 2020-01-15 | 2020-01-15 | Method for reinforcing end part of test piece |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535435A (en) * | 2014-10-13 | 2015-04-22 | 南京航空航天大学 | Fragile material tension and torsion test method and test auxiliary device |
| CN105004762A (en) * | 2015-07-06 | 2015-10-28 | 中国石油大学(北京) | Core holding unit |
| CN105352801A (en) * | 2015-11-24 | 2016-02-24 | 北京卫星制造厂 | Method for testing compression performance of carbon-fiber reinforced resin-based thin-wall composite pipe |
| CN110361241A (en) * | 2019-08-13 | 2019-10-22 | 山东科技大学 | A kind of rocks in direct tension sample quick preparation device and preparation method |
-
2020
- 2020-01-15 CN CN202010041029.XA patent/CN113125216A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535435A (en) * | 2014-10-13 | 2015-04-22 | 南京航空航天大学 | Fragile material tension and torsion test method and test auxiliary device |
| CN105004762A (en) * | 2015-07-06 | 2015-10-28 | 中国石油大学(北京) | Core holding unit |
| CN105352801A (en) * | 2015-11-24 | 2016-02-24 | 北京卫星制造厂 | Method for testing compression performance of carbon-fiber reinforced resin-based thin-wall composite pipe |
| CN110361241A (en) * | 2019-08-13 | 2019-10-22 | 山东科技大学 | A kind of rocks in direct tension sample quick preparation device and preparation method |
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Application publication date: 20210716 |