CN107782666B - Method for testing pulling-out destructive power of embedded part of glued joint aluminum honeycomb sandwich structure - Google Patents
Method for testing pulling-out destructive power of embedded part of glued joint aluminum honeycomb sandwich structure Download PDFInfo
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- CN107782666B CN107782666B CN201710938873.0A CN201710938873A CN107782666B CN 107782666 B CN107782666 B CN 107782666B CN 201710938873 A CN201710938873 A CN 201710938873A CN 107782666 B CN107782666 B CN 107782666B
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Abstract
The invention discloses a method for testing the pulling-out destructive power of an embedded part of a glued joint aluminum honeycomb sandwich structure, which comprises the following steps: manufacturing a sample of a glued joint aluminum honeycomb sandwich structure; the bonded aluminum honeycomb sandwich structure sample comprises at least one embedded part; inspecting the appearance of the bonded aluminum honeycomb sandwich structure sample according to a preset appearance standard; and applying a pulling force on the embedded part on the sample of the glued joint aluminum honeycomb sandwich structure until the sample of the glued joint aluminum honeycomb sandwich structure is damaged, and recording the pulling force at the moment as a pulling-off destructive force. The invention can quickly, accurately and effectively detect the pulling-out damage mechanical property of the embedded part of the glued joint aluminum honeycomb sandwich structure, thereby detecting the glued joint quality of the glued joint aluminum honeycomb sandwich structure and the embedded part in time and ensuring the reliability of the glued joint aluminum honeycomb sandwich structure in use.
Description
Technical Field
The invention relates to the technical field of a test method of a glued joint aluminum honeycomb sandwich structure, in particular to a test method of the pulling-out destructive power of an embedded part of the glued joint aluminum honeycomb sandwich structure.
Background
The glued joint aluminum honeycomb sandwich structure has the advantages of high specific strength, good shock resistance, vibration reduction, microwave transmission, strong designability and the like, and is one of indispensable structural materials in the field of aerospace at present.
A bonded aluminum honeycomb sandwich structure generally comprises: a thin aluminum panel, a thin plate of the outer layer of the sandwich structure; aluminum honeycomb core, aluminum foil through light core material of hexagonal lattice shape processed by cementation; the insert is embedded in the honeycomb sandwich structure by using an adhesive and is used as a fastener for connecting the honeycomb sandwich structure with other structural members or equipment; the embedded part is an embedded part embedded in the honeycomb sandwich structure in advance in the forming process of the honeycomb sandwich structure. The glued joint aluminum honeycomb sandwich structure is a basic structural component, and the connection of all components is realized mainly by embedded parts. The embedded part is embedded in the glued aluminum honeycomb sandwich structure by using adhesive glue.
Different embedded parts are embedded in the glued joint aluminum honeycomb sandwich structure, the embedded parts bear loads, the loads are transmitted to the whole structure through the embedded parts, therefore, the load bearing capacity of the embedded parts directly influences the reliability of the structure, and the pull-off destructive force of the embedded parts is the most important mechanical property index for inspecting the glued joint aluminum honeycomb sandwich structure and the loads borne by the embedded parts.
However, because the different glued joint aluminum honeycomb sandwich structures and embedded parts have very different designs and processes, the gluing and moving cannot be simply carried out, and a corresponding mechanical property testing method must be provided according to the specific requirements of the structures. The current common tests cannot meet the actual use requirements.
Disclosure of Invention
In view of the above, the present invention provides a method for testing a pulling-off destructive power of an embedded part of a glued joint aluminum honeycomb sandwich structure, which can quickly, accurately and effectively detect the pulling-off destructive mechanical properties of the embedded part of the glued joint aluminum honeycomb sandwich structure, thereby detecting the gluing quality of the glued joint aluminum honeycomb sandwich structure and the embedded part in time and ensuring the reliability of the glued joint aluminum honeycomb sandwich structure in use.
Based on the purpose, the invention provides a method for testing the pulling-out destructive power of an embedded part of a glued joint aluminum honeycomb sandwich structure, which comprises the following steps:
manufacturing a sample of a glued joint aluminum honeycomb sandwich structure; the bonded aluminum honeycomb sandwich structure sample comprises at least one embedded part;
inspecting the appearance of the bonded aluminum honeycomb sandwich structure sample according to a preset appearance standard;
and applying a pulling force on the embedded part on the sample of the glued joint aluminum honeycomb sandwich structure until the sample of the glued joint aluminum honeycomb sandwich structure is damaged, and recording the pulling force at the moment as a pulling-off destructive force.
In some embodiments, the method further comprises, according to a preset appearance criterion:
the axis of the embedded part on the sample of the bonded aluminum honeycomb sandwich structure is vertical to the surface of the sample of the bonded aluminum honeycomb sandwich structure;
the surface of the glued joint aluminum honeycomb sandwich structure sample has no panel warping, bubbling, degumming, pit pressing and core corrugation.
In some embodiments, the method further comprises: pretreating the bonded aluminum honeycomb sandwich structure sample: placing the bonded aluminum honeycomb sandwich structure sample in a standard test environment for at least six hours; the standard test environment is: the temperature is 23 ℃ plus or minus 2 ℃, and the relative humidity is 50 percent plus or minus 5 percent.
In some embodiments, the applying tension to the embedment on the bonded aluminum honeycomb sandwich structure specimen includes:
and continuously applying tension to the embedded part on the sample of the bonded aluminum honeycomb sandwich structure at a testing speed of 5 mm/min.
In some embodiments, the fabricated bonded aluminum honeycomb sandwich structure sample is a bonded aluminum honeycomb sandwich structure front sample; the surface corresponding to the panel of the sample on the front surface of the glued joint aluminum honeycomb sandwich structure is a square with the side length of 150 mm; the embedded part is arranged at the central position of the sample on the front surface of the glued joint aluminum honeycomb sandwich structure.
In some embodiments, the applying a tensile force to the embedded part on the cemented aluminum honeycomb sandwich structure sample until the cemented aluminum honeycomb sandwich structure sample is damaged, and the recording the tensile force at this time as a pull-off destructive force includes:
fixing the sample on the front surface of the glued aluminum honeycomb sandwich structure by using a clamp;
fixedly connecting a tension output end with the embedded part;
and continuously applying a pulling force to the embedded part by a pulling force output end at a testing speed of 5mm/min until the sample on the front surface of the bonded aluminum honeycomb sandwich structure is damaged, and recording the maximum force during the testing as a pulling-off destructive force.
In some embodiments, the sample for making the bonded aluminum honeycomb sandwich structure is a side sample of the bonded aluminum honeycomb sandwich structure; the surface corresponding to the panel of the sample on the side surface of the glued joint aluminum honeycomb sandwich structure is a rectangle with the width of 80mm and the length of not less than 150 mm; one end of the side surface sample of the glued joint aluminum honeycomb sandwich structure along the length direction is provided with one embedded part, and the other end is provided with two embedded parts.
In some embodiments, the applying a tensile force to the embedded part on the cemented aluminum honeycomb sandwich structure sample until the cemented aluminum honeycomb sandwich structure sample is damaged, and the recording the tensile force at this time as a pull-off destructive force includes:
preparing a steel plate with the same shape and size as the sample on the side surface of the bonded aluminum honeycomb sandwich structure, and fixing the steel plate at a fixed position;
fixedly connecting the side sample of the glued joint aluminum honeycomb sandwich structure with the steel plate through the two embedded parts at the other end of the side sample of the glued joint aluminum honeycomb sandwich structure along the length direction;
fixedly connecting a tension output end with the embedded part at one end of the side surface sample of the glued joint aluminum honeycomb sandwich structure along the length direction;
and continuously applying a pulling force to the embedded part by a pulling force output end at a testing speed of 5mm/min until the sample on the side surface of the bonded aluminum honeycomb sandwich structure is damaged, and recording the maximum force during the testing as a pulling-off destructive force.
From the above, the method for testing the pulling-off destructive power of the embedded part of the cemented aluminum honeycomb sandwich structure provided by the invention provides a new pulling-off testing method for the quality control of the pulling-off destructive power of the embedded part of the cemented aluminum honeycomb sandwich structure through a clear and strict testing method and test result processing. Specifically, through the process test flows of preparing a test sample, checking the appearance, performing a pulling-off test and the like, the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure is measured, whether the quality of the embedded part of the glued joint aluminum honeycomb sandwich structure meets the overall process carried out by the regulation or not is verified, the pulling-off destructive mechanical property of the embedded part of the glued joint aluminum honeycomb sandwich structure can be quickly, accurately and effectively detected, the gluing quality of the glued joint aluminum honeycomb sandwich structure and the embedded part is timely detected, and the reliability of the glued joint aluminum honeycomb sandwich structure in use is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing the pull-out destructive power of an embedded part of a glued joint aluminum honeycomb sandwich structure according to an embodiment of the invention;
FIG. 2(a) is a schematic structural diagram of a front sample of a bonded aluminum honeycomb sandwich structure in an embodiment of the present invention;
FIG. 2(b) is a schematic cross-sectional view of a sample on the front side of a bonded aluminum honeycomb sandwich structure in an embodiment of the present invention;
FIG. 3(a) is a schematic side view of a sample structure of a bonded aluminum honeycomb sandwich structure in an embodiment of the present invention;
fig. 3(b) is a schematic cross-sectional structure of a sample at the side of a bonded aluminum honeycomb sandwich structure in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The embodiment of the invention provides a method for testing the pulling-out destructive power of an embedded part of a glued joint aluminum honeycomb sandwich structure. Referring to fig. 1, a flow chart of a method for testing a pull-out destructive power of an embedded part of a bonded aluminum honeycomb sandwich structure according to an embodiment of the present invention is shown.
The method for testing the pulling-out destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure comprises the following steps of:
step 101, manufacturing a sample with a glued aluminum honeycomb sandwich structure; the bonded aluminum honeycomb sandwich structure sample comprises at least one embedded part;
102, checking the appearance of the bonded aluminum honeycomb sandwich structure sample according to a preset appearance standard;
103, applying a pulling force on the embedded part on the sample of the glued joint aluminum honeycomb sandwich structure until the sample of the glued joint aluminum honeycomb sandwich structure is damaged, and recording the pulling force at the moment as a pulling-off destructive force.
The bonded aluminum honeycomb sandwich structure sample comprises: a bonded aluminum honeycomb sandwich front sample (hereinafter referred to simply as "front sample") and a bonded aluminum honeycomb sandwich side sample (hereinafter referred to simply as "side sample"). The test device is respectively used for testing the pull-off destructive power of the embedded parts positioned on the front surface and the side surface of the glued joint aluminum honeycomb sandwich structure. The method for testing the pulling-out destructive power of the embedded part of the cemented aluminum honeycomb sandwich structure is further described by two specific examples based on the two samples. In the embodiments described below, the embedment is an internally threaded fastener.
Example one
The test was carried out using a frontal specimen in this example.
Step one, manufacturing a front sample:
the surface corresponding to the panel of the front sample is a square with the side length of 150mm +/-0.5 mm. The embedded part is arranged at the central position of the front sample; wherein the panel thickness tfThe sample core thickness hc, the sample thickness h and the embedded part should be consistent with the final product of the glued joint aluminum honeycomb sandwich structure. The structure of the front face sample is shown in fig. 2(a) and 2 (b).
The manufacturing process of the front sample comprises the following steps: the panel, the honeycomb core, the embedded part and the adhesive used for manufacturing the front sample are consistent with the aluminum honeycomb sandwich structure product; cutting and preparing a panel which meets the specifications; performing phosphoric acid anodizing treatment on the prepared embedded parts and the panel according to the requirements of relevant product standards or process documents; discarding 30mm of the edge of the aluminum honeycomb core material, and cutting and preparing the aluminum honeycomb core meeting the specification at the position without defects by visual inspection; according to the use requirement of the adhesive, the gluing process, the assembling process and the curing conditions, the cut and prepared aluminum honeycomb core, the embedded part and the panel which are anodized by phosphoric acid are glued, assembled, cured and molded by the adhesive to obtain the front sample.
Step two, checking the appearance of the front sample according to a preset appearance standard:
after the front sample is prepared, the axis of the embedded part on the front sample is vertical to the surface of the front sample. And (4) carrying out appearance quality inspection, wherein the surface of the front sample has no defects such as panel warping, bubbling, degumming, indentation, core corrugation and the like.
Step three, preprocessing the face sample:
the present embodiment is a standard test environment at normal temperature, and the standard test environment conditions are 23 ℃ ± 2 ℃ and 50% ± 5% of relative humidity.
Pretreatment of the positive test specimens, i.e., subjecting the positive test specimens to a standard test environment for at least six hours prior to testing. If a special test environment is used, the special storage conditions can be set according to specific needs.
Step four, performing pull-off test on the front surface sample:
use dedicated test fixture in the test of pulling off, it includes: the device comprises a clamp for fixing corresponding parts, a testing machine with a tension output end for outputting tension, a sensor for recording the tension and the like.
The pull-off test procedure comprises: correctly installing a pull-off test sample of the embedded part on the front surface of the aluminum honeycomb sandwich structure in a special fixture and centering; selecting a proper clamp; clamping the connector of the special clamp in a proper clamp connected with the force sensor, and resetting the force of the tester; connecting the embedded part of the pull-off test sample by using a threaded connector which is consistent with the nominal specification of the thread of the embedded part on the front side of the pull-off test sample; selecting a proper clamp to clamp the threaded connector, and ensuring that the central line of the pull-off test sample is consistent with the axis of the applied load; continuously loading the pull-off test sample at a test speed of 5mm/min until the sample is destroyed, and recording the maximum force during the test as a pull-off destructive force Fm. The sample failure mode was recorded.
Example two
The test was carried out using a side sample in this example.
Step one, manufacturing a side surface sample:
the surface corresponding to the panel of the side sample is a rectangle with the width of 80mm +/-0.3 mm and the length of not less than 150mm (the length is more than or equal to 150mm +/-0.5 mm). The end part position of side sample is provided with two built-in fittings, specifically, the one end along length direction of side sample sets up one the built-in fitting, and the other end sets up two the built-in fitting. Thickness t of the panelfSample core thickness hc, sample thicknessThe degree h and the embedded part should be consistent with the final product of the glued joint aluminum honeycomb sandwich structure. The structure of the front face sample is shown in fig. 3(a) and 3 (b).
The process for making the side samples included: the panel, the honeycomb core, the embedded part and the adhesive used for manufacturing the side surface sample are consistent with the aluminum honeycomb sandwich structure product; cutting and preparing a panel which meets the specifications; performing phosphoric acid anodizing treatment on the prepared embedded parts and the panel according to the requirements of relevant product standards or process documents; discarding 30mm of the edge of the aluminum honeycomb core material, and cutting and preparing the aluminum honeycomb core meeting the specification at the position without defects by visual inspection; according to the use requirement of an adhesive, a gluing process, an assembling process and a curing condition, the cut and prepared aluminum honeycomb core, an embedded part and a panel which are anodized by phosphoric acid are glued, assembled, cured and molded by the adhesive to obtain a side sample.
Step two, checking the appearance of the side sample according to a preset appearance standard:
after the side surface sample is prepared, the axis of the embedded part on the side surface sample is vertical to the surface of the side surface sample. And (4) carrying out appearance quality inspection, wherein the surface of the side sample has no defects such as panel warping, bubbling, degumming, indentation, core corrugation and the like.
Step three, preprocessing the side sample:
the present embodiment is a standard test environment at normal temperature, and the standard test environment conditions are 23 ℃ ± 2 ℃ and 50% ± 5% of relative humidity.
Pretreatment of the side samples, i.e., subjecting the side samples to a standard test environment for at least six hours prior to testing. If a special test environment is used, the special storage conditions can be set according to specific needs.
Step four, carrying out pull-off test on the side surface sample:
use dedicated test fixture in the test of pulling off, it includes: the device comprises a clamp for fixing corresponding parts, a testing machine with a tension output end for outputting tension, a sensor for recording the tension and the like.
The pull-off test procedure comprises: preparing a steel plate with the length of 80mm, the thickness of 10mm and the width equal to the thickness of the aluminum honeycomb sandwich structure, processing a through thread of M12 in the thickness direction of the center of the steel plate, and processing two through threads with the same nominal specification as the threads of the embedded part at positions 15mm away from the edge on two sides; fastening and connecting the steel plate with the side surface sample by using two screws with the nominal specifications of the threads of the two embedded parts at the other end of the side surface sample consistent with the nominal specifications of the threads of the two embedded parts;
e) connecting the embedded part at one end of the test sample by using a threaded connector which has the same nominal specification with the thread of the embedded part at the side surface of the test sample; selecting a proper clamp; clamping the threaded connector of M12 in a proper clamp connected with a force sensor, and resetting the force of the tester; connecting the embedded part at one end of the test sample by using a threaded connector which has the same nominal specification with the thread of the embedded part on the side surface of the test sample, and clamping the threaded connector in a proper clamp to ensure that the central line of the test sample is consistent with the axis of the applied load; continuously loading the sample at a test speed of 5mm/min until the sample is damaged, and recording the maximum force during the test as a pull-off destructive force Fm. The sample failure mode was recorded.
In some alternative embodiments, multiple samples of the bonded aluminum honeycomb sandwich were made and tested in groups and the results recorded. Specifically, the number of samples in the same batch in each group is generally not less than 5, and the number of effective samples in the same batch in each group is not less than 5.
In this embodiment, the method further includes a step of calculating and processing the test result. Specifically, the arithmetic mean, the standard deviation and the dispersion coefficient of each group of effective samples are respectively calculated. The result value of the test measurement should be reduced according to the requirements of the relevant product standard. If not specified, pull-off failure force FmAnd (5) rounding to 1N, and taking two significant digits by the standard deviation and the discrete coefficient.
The embodiment shows that the method for testing the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure provides a new pulling-off testing method for the quality control of the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure through a clear and strict testing method and testing result processing. Specifically, through the process test flows of preparing a test sample, checking the appearance, performing a pulling-off test and the like, the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure is measured, whether the quality of the embedded part of the glued joint aluminum honeycomb sandwich structure meets the overall process carried out by the regulation or not is verified, the pulling-off destructive mechanical property of the embedded part of the glued joint aluminum honeycomb sandwich structure can be quickly, accurately and effectively detected, the gluing quality of the glued joint aluminum honeycomb sandwich structure and the embedded part is timely detected, and the reliability of the glued joint aluminum honeycomb sandwich structure in use is guaranteed.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A method for testing the pulling-out destructive power of an embedded part of a glued aluminum honeycomb sandwich structure is characterized by comprising the following steps of:
manufacturing a sample of a glued joint aluminum honeycomb sandwich structure; the bonded aluminum honeycomb sandwich structure sample comprises at least one embedded part;
inspecting the appearance of the bonded aluminum honeycomb sandwich structure sample according to a preset appearance standard;
pretreating the sample of the glued joint aluminum honeycomb sandwich structure to enable the sample of the glued joint aluminum honeycomb sandwich structure to adapt to a test environment;
applying a pulling force on the embedded part on the sample of the glued joint aluminum honeycomb sandwich structure until the sample of the glued joint aluminum honeycomb sandwich structure is damaged, and recording the pulling force at the moment as a pulling-off destructive force;
the sample of the glued joint aluminum honeycomb sandwich structure is a sample of the side surface of the glued joint aluminum honeycomb sandwich structure; the surface corresponding to the panel of the sample on the side surface of the glued joint aluminum honeycomb sandwich structure is a rectangle with the width of 80mm and the length of not less than 150 mm; one end of the side surface sample of the glued joint aluminum honeycomb sandwich structure along the length direction is provided with one embedded part, and the other end is provided with two embedded parts;
applying a pulling force on the embedded part on the bonded aluminum honeycomb sandwich structure sample until the bonded aluminum honeycomb sandwich structure sample is damaged, and recording the pulling force at the moment as a pulling-off destructive force, wherein the step comprises the following steps: preparing a steel plate with the same shape and size as the sample on the side surface of the bonded aluminum honeycomb sandwich structure, and fixing the steel plate at a fixed position; fixedly connecting the side sample of the glued joint aluminum honeycomb sandwich structure with the steel plate through the two embedded parts at the other end of the side sample of the glued joint aluminum honeycomb sandwich structure along the length direction; fixedly connecting a tension output end with the embedded part at one end of the side surface sample of the glued joint aluminum honeycomb sandwich structure along the length direction; and continuously applying a pulling force to the embedded part by a pulling force output end at a testing speed of 5mm/min until the sample on the side surface of the bonded aluminum honeycomb sandwich structure is damaged, and recording the maximum force during the testing as a pulling-off destructive force.
2. The method for testing the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure according to claim 1, wherein the method comprises the following steps according to preset appearance standards:
the axis of the embedded part on the sample of the bonded aluminum honeycomb sandwich structure is vertical to the surface of the sample of the bonded aluminum honeycomb sandwich structure;
the surface of the glued joint aluminum honeycomb sandwich structure sample has no panel warping, bubbling, degumming, pit pressing and core corrugation.
3. The method for testing the pulling-off destructive power of the embedded part of the glued joint aluminum honeycomb sandwich structure according to claim 1, further comprising the following steps of:
pretreating the bonded aluminum honeycomb sandwich structure sample: placing the bonded aluminum honeycomb sandwich structure sample in a standard test environment for at least six hours; the standard test environment is: the temperature is 23 ℃ plus or minus 2 ℃, and the relative humidity is 50 percent plus or minus 5 percent.
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| EP1070858A1 (en) * | 1999-07-22 | 2001-01-24 | Mitsubishi Denki Kabushiki Kaisha | Sandwich panel and method of manufacturing the sandwich panel |
| CN106021802A (en) * | 2016-06-06 | 2016-10-12 | 上海宇航系统工程研究所 | Finite element calculation method for strength of embedded-beam-containing honeycomb sandwich structure |
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| US4716067A (en) * | 1986-09-12 | 1987-12-29 | The Boeing Company | Honeycomb core structure with embedded fastener |
| CN103091171B (en) * | 2013-01-29 | 2015-02-11 | 昆山市建设工程质量检测中心 | Method for detecting glass curtain wall upright post embedded part joint tension performance on site |
| CN205067244U (en) * | 2015-09-14 | 2016-03-02 | 航天材料及工艺研究所 | A frock that is used for cuting in combined material structural plane capability test usefulness |
| CN205562269U (en) * | 2016-04-07 | 2016-09-07 | 山东英特力新材料有限公司 | Equipment of supplementary universal tester test combined material's intermediate layer built -in fitting |
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|---|---|---|---|---|
| EP1070858A1 (en) * | 1999-07-22 | 2001-01-24 | Mitsubishi Denki Kabushiki Kaisha | Sandwich panel and method of manufacturing the sandwich panel |
| CN106021802A (en) * | 2016-06-06 | 2016-10-12 | 上海宇航系统工程研究所 | Finite element calculation method for strength of embedded-beam-containing honeycomb sandwich structure |
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