CN109900514B - Adhesive tape sample sampling device and sampling method for adhesive structure aging performance test and adhesive tape pre-embedding position optimization method - Google Patents
Adhesive tape sample sampling device and sampling method for adhesive structure aging performance test and adhesive tape pre-embedding position optimization method Download PDFInfo
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- CN109900514B CN109900514B CN201910311699.6A CN201910311699A CN109900514B CN 109900514 B CN109900514 B CN 109900514B CN 201910311699 A CN201910311699 A CN 201910311699A CN 109900514 B CN109900514 B CN 109900514B
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Abstract
The invention discloses an adhesive tape sample sampling device and a sampling method for an adhesive structure aging performance test and an adhesive tape pre-embedding position optimization method, wherein the adhesive tape sample sampling device comprises: one end of the first frame is vertically provided with a first bulge, the other end of the first frame is vertically provided with a first groove, and the middle part of the first frame is sunken towards the inner side; one end of the second frame is vertically provided with a second groove, the other end of the second frame is vertically provided with a second bulge, and the middle part of the second frame is sunken towards the inner side; the first frame and the second frame are detachably connected to form a whole frame; the first slot opening position is formed in the side faces of the inner side and the outer side of the first frame and the second frame; the second slotting position is positioned below the upper slotting; and the reserved holes are respectively arranged at two ends of the first slot opening position and the second slot opening position. The problem that the existing car window bonding structure is difficult to sample under the natural aging condition can be solved. The invention also provides a sampling method of the adhesive tape sample for the adhesive structure aging performance test and an optimization method of the pre-buried position of the adhesive tape.
Description
Technical Field
The invention relates to an adhesive tape sample sampling device and method for an adhesive structure aging performance test and an adhesive tape pre-embedding position optimization method, and belongs to the technical field of adhesive structure test and testing.
Background
With the continuous development of new industrial materials, new technology and light weight, the application of the bonding technology is widely applied. The adhesive is mainly divided into an elastic adhesive and a structural adhesive, and the elastic adhesive is mainly used for high-speed rail vehicle windows. By using the bonding technique, the connection between the dissimilar materials can be achieved, enhancing the rigidity, durability and impact resistance of the connection structure. The bonding technology is applied to the car body, so that the driving comfort can be improved, the noise in the car can be reduced, the vibration can be reduced, the weight can be reduced, the energy consumption can be reduced, the process can be simplified, the product quality can be improved, and the effect which is difficult to achieve by methods such as welding, riveting and the like can be achieved.
The high-speed motor train unit train needs to adapt to a complex service environment in the use process, so that the bonding structure applied to the body of the high-speed motor train unit train is often under the action of complex environmental factors (temperature and humidity). The bonding performance of the adhesive is obviously influenced by the environment (temperature and humidity), and the aging phenomenon can occur in the long-term use process, so that the bonding structure performance is reduced, and the application of the bonding technology in the vehicle body connection is hindered to a great extent.
Under the technical background, the natural environment aging test of the adhesive is particularly necessary, the aging performance of the existing actual vehicle window bonding structure is difficult to test under the natural aging condition, and because the adhesive tape after natural aging needs to be cut from the vehicle window bonding structure during the overhaul of a high-speed motor train unit running for a certain mileage, the integrity of the adhesive tape is difficult to guarantee during cutting, and dumbbell-shaped test pieces with uniform size, uniform thickness and no damage are difficult to manufacture. The stress-strain curve, the tensile strength and other mechanical performance parameters obtained by using the dumbbell-shaped adhesive tape for adhesive tape strength test have great errors, and the aging failure behavior of the adhesive structure cannot be evaluated through a subsequent aging failure test to judge whether the adhesive structure is safe or not. Based on the situation, the invention provides the test device and the test method which are convenient for cutting the natural aging test sample, and overcomes the defects of the existing sample preparation.
Disclosure of Invention
The invention designs and develops an adhesive tape sample sampling device for an aging performance test of an adhesion structure, and can solve the problems that the existing actual vehicle window adhesion structure is difficult to sample under a natural aging condition, the sampling integrity and the sampling precision cannot be ensured, and the subsequent test result is influenced.
The invention also designs and develops a rubber strip sample sampling method for the bonding structure aging performance test, which can quickly and accurately take out a sample and ensure the dimensional precision of the taken sample.
The invention also designs and develops an optimization method of the pre-embedding position of the adhesive tape, and the pre-embedding position of the adhesive tape sample can be selected and positioned on the premise of not interrupting the continuity of the adhesive tape and not influencing the overall strength.
The technical scheme provided by the invention is as follows:
a adhesive tape sample sampling device for bonding structure aging performance test includes:
one end of the first frame is vertically provided with a first bulge, the other end of the first frame is vertically provided with a first groove, and the middle part of the first frame is sunken towards the inner side;
one end of the second frame is vertically provided with a second groove, the other end of the second frame is vertically provided with a second bulge, and the middle part of the second frame is sunken towards the inner side;
the first bulge is matched with the second groove, and the first groove is matched with the second bulge, so that the first frame and the second frame are detachably connected to form a whole frame;
the first slot opening position is formed in the side faces of the inner side and the outer side of the first frame and the second frame;
the second slotting position is arranged on the side surfaces of the inner side and the outer side of the first frame and the second frame and is arranged at intervals with the first slotting position;
and the reserved holes are respectively arranged at two ends of the first slot opening position and the second slot opening position.
Preferably, the prepared hole is tangential to the grooving position.
Preferably, the method further comprises the following steps:
and the two connecting plates are detachably arranged outside the two end surfaces of the integral frame.
Preferably, the spacing is 2 mm.
Preferably, the whole periphery of the frame is coated with a teflon coating.
Preferably, the frame is of a dumbbell-shaped structure as a whole.
Preferably, scales are arranged on the tops of the first frame and the second frame.
The utility model provides a rubber strip sample sampling method for bonding structure aging testing uses the rubber strip sample sampling device for bonding structure aging testing which characterized in that specifically includes as follows:
step 1, cutting the outline of a sampling device;
step 2, positioning the outline of the sampling device on a test bed, aligning a preformed hole on one side of the sampling device by using a drilling tool, and drilling from one side of the sampling device to the other side to obtain the sampling device with through holes at two ends;
step 3, sequentially extending a cutting tool into the through hole at one end of the outline of the sampling device, and cutting from one end to the other end along the trench opening position;
and 4, detaching the first frame and the second frame, and removing and tearing off redundant adhesive tapes to obtain the target sample.
The method for optimizing the embedded position of the adhesive tape is used for the adhesive tape sample sampling device for the adhesive structure aging performance test, and is characterized in that the embedded position of the sampling device is optimized, and the method comprises the following steps:
determining a target window size; applying a vertical load to the adhesive layer of the window body, and carrying out analysis and calculation; determining a pre-embedding position according to an analysis result;
and determining the pre-embedded position as the side edge of the vehicle window close to the maximum stress area and the maximum deformation area.
Preferably, the maximum stress borne by the adhesive layer of the vehicle window is 0.52Mpa, and the deformation value of the maximum deformation position is 0.241 mm.
The invention has the following beneficial effects:
1. when the rubber coating is installed on the windows of the high-speed motor train unit, the dumbbell-shaped test pieces required by the test are prepared in an embedded mode, when the residual strength of the naturally aged rubber strips needs to be tested, the test pieces are taken down at the embedded positions around the windows, and the test pieces with higher size precision are directly obtained through simple cutting treatment.
2. The conditions that the sizes of the existing manual cut pieces are not uniform and the thicknesses are not uniform are avoided by adopting a pre-buried test piece mode, the obtained test sample can be directly tested, and the mechanical properties of the material can be accurately described.
3. The embedded sampling device is combined with finite element simulation position optimization, and the embedded position can be selected and positioned under the conditions that the colloid continuity is not interrupted, the overall strength is not influenced, and the load can be accurately reflected.
4. The device can overcome the defect that a test piece is difficult to cut in a life prediction test, a test piece with standard required size and smooth and complete surface is designed, the subsequent prediction and evaluation of the natural aging failure behavior of the window bonding structure are facilitated, and the device provides experimental and theoretical support for the strength design of the window bonding structure of the high-speed motor train unit.
5. The connecting plate is connected with the left part and the right part of the sampling device body through the outer hexagon screws, and compared with screws with other structures such as cross screws, the colloid is easy to clean after the nuts of the outer hexagon screws are covered by the colloid, and the outer hexagon screws can be conveniently screwed out.
Drawings
Fig. 1 is a schematic view of a window assembly of a high-speed rail vehicle window according to the present invention.
FIG. 2 is an isometric view of a strip sample sampling apparatus for the aging performance test of bonded structures according to the present invention.
FIG. 3 is an exploded view of the adhesive tape sampling device for the aging performance test of the bonded structure according to the present invention.
FIG. 4 is a front view of a sample strip sampling device for an aging test of a bonded structure according to the present invention.
FIG. 5 is a top view of the adhesive tape sample sampling device for the aging performance test of the bonded structure according to the present invention.
FIG. 6 is a left side view of the adhesive tape sample sampling device for the aging performance test of the bonded structure according to the present invention.
FIG. 7 is a cross-sectional view A-A of a sample strip sampling device for an aging performance test of a bonded structure according to the present invention.
Fig. 8 is a geometric model diagram of the window of the high-speed rail vehicle window according to the invention.
FIG. 9 is a front view of the pre-buried position of the adhesive tape sample and the sampling device for the aging performance test of the bonding structure.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
As shown in FIGS. 1 to 9, the present invention provides a sampling device for a sample strip used in an aging test of a bonded structure, comprising: window 100, sampling device 200, left frame 210, second frame 260, first slot opening 230, second slot opening 260, prepared holes 280a, 280b and connecting plate 240.
The sampling device 200 is pre-embedded in the bonding structure of the window body 100, the window body 100 of the high-speed rail car window adopts double-layer glass and is composed of two or more layers of common flat glass, 110 is the outer glass of the window body assembly, 120 is colloid (namely the embedding position of the sampling device), 130 is the window frame structure, and 140 is the inner glass of the window body assembly. The periphery of the glass is bonded and sealed with two or more pieces of glass, sealing strips and glass strips by using a high-strength and high-airtightness composite binder, the middle of the glass is filled with dry gas, and a frame is filled with a drying agent so as to ensure the air dryness between the glass pieces.
The sampling device comprises: the first frame 210 and the second frame 260, the first frame 210 and the second frame 260 are arranged oppositely, one end of the first frame 210 is vertically provided with a first protrusion, the other end of the first frame 210 is provided with a first groove, one end of the second frame 260 is vertically provided with a second groove, the other end of the second frame 260 is vertically provided with a second protrusion, the first protrusion is matched with the second groove, the first groove is matched with the second protrusion, and the first frame and the second frame are detachably connected to form a whole frame. The middle parts of the first frame 210 and the second frame 260 are both concave inwards, so that the whole frame is in a dumbbell-shaped structure.
The two ends of the whole frame are also provided with connecting plates 250, and the connecting plates 250 are detachably connected with the whole frame through screws 240. Screw holes are arranged at two ends of the whole frame, and the screws 240 and the screw holes are in interference fit for preventing uncured alternate invasion. The first frame 230 and the second frame 260 are coupled by the grooves and the protrusions to restrict the degree of freedom in the length direction thereof, and coupled by the coupling plate 250 and the screws 240 to restrict the degree of freedom in the width direction thereof.
On the top terminal surface of first frame 210 and second frame 260, all be provided with scale mark 220, the both ends symmetry setting of first frame 210 and second frame 260 is followed to the scale mark, and the distance between both ends scale mark 220 is greater than the length of required appearance piece, utilizes the scale mark to carry out length direction's size location, makes things convenient for the sample cutting. In the inside and outside both sides of first frame 210 and second frame 260, all be provided with first trench 230 and second trench 260, stagger from top to bottom first trench 230 and second trench 260 to the interval between first trench 230 and the second trench 260 is 2mm, and along sampling device 2mm lateral wall all around, do not include upper and lower surface, the coating has the teflon coating, adhesion between colloid and the sampling device when preventing to peel off. In order to ensure the continuity of the rubber strip, the top and the bottom of the sampling device are not subjected to Teflon coating treatment.
The plurality of reserved holes are arranged at two ends of the first slot opening position 230 and the second slot opening position 260, the first reserved holes 280a are arranged at two ends of the first slot opening position 230, the second reserved holes 280b are arranged at two ends of the second slot opening position 260, the centers of circles of the first reserved holes 280a and the second reserved holes 280b are not on the same horizontal line with the first slot opening position 230 and the second slot opening position 260, the first reserved holes 280a are tangent to the edge of the first slot opening position, the center of circle of the first reserved holes 280a is located below the first slot opening position 230, the center of circle of the second reserved holes 280b is tangent to the edge of the second slot opening position 260, and the center of circle of the second reserved holes 280b is located above the first slot opening position 260.
The first slot 230 and the second slot 260 are staggered in the length direction, so that the rigidity of the weak connection part is improved. The length of the slot is greater than the length of the sample to be taken.
In the invention, as an optimization, the material of the sampling device is die steel, and compared with an aluminum alloy die, the die steel has the advantages of good wear resistance, good mirror polishing performance, high hardness, long service life and lower cost than an aluminum alloy material. The surface roughness should be greater than rz0.8, so the mold must go through grinding and polishing processes.
The invention also provides a sampling method of the adhesive tape sample for the bonding structure aging performance test, which specifically comprises the following steps:
step 1, cutting the outline of a sampling device;
when the three-stage repair, the four-stage repair and the five-stage repair of the operation mileage of the vehicle bonding structure are required to be provided, the general outline of the pre-buried sampling device is cut out in the sealant of the glass window and the window frame by a cutter, the cutting is necessary to cut according to the outline of the mold, the cutting is avoided from cutting into the sample part of the adhesive tape in the sampling device when the cutter is put down, the excessive adhesive tapes on the upper top surface and the lower bottom surface are cut off along the edges of the top part and the bottom part of the mold after the sample is taken out, the adhesive tapes on the periphery of the mold are scraped off completely by a scraper;
step 2, positioning the sampling device and then drilling;
placing the taken complete sampling device on a leveling test bed, and reinforcing the sampling device to ensure that a workpiece is stable in the drilling process; when drilling is started, firstly, a micro centering drill with good rigidity is used for drilling an initial hole with the depth of 1-2 times of the diameter, the drill point apex angle of the centering drill is equal to or larger than the micro drill apex angle of the final drilling hole, if the apex angle of the centering drill is smaller, then when the micro drill is cut, two cutting edges firstly contact a workpiece than the apex, the deviation of the hole is easy to increase, then the micro drill is held to penetrate a reserved hole from one side of a sampling device to the other side, a step-by-step drilling sequence is adopted in the drilling process, namely, the drill is periodically withdrawn, the blockage of colloid powder is prevented, and a large amount of fine powdery materials generated by colloid in the drilling process can be subjected to chip removal by adopting a compressed air method. At the beginning and end of drilling, the feed should be reduced 1/3 to eliminate centering errors;
and 3, cutting a sample in the sampling device, after four reserved holes on two sides of the sampling device are drilled completely, extending one end of an ultrafine diamond wire or a steel saw blade into the drilled hole to cut the upper and lower slotted positions of the die along the length direction of the die respectively, and cutting out a sample with the thickness of 2mm of the rubber strip in the middle of the die, wherein the thickness and the width of the rubber strip are standard required sizes. And cutting and positioning in the length direction by using scale marks on the top surface of the die, aligning the steel ruler with the scale marks on the left side and the right side, and cutting colloid in the length direction by using a sharp nicking tool along the aligned steel ruler to obtain the standard sample required by the test size.
Step four: take out the sample, the standard sample that the cutting finishes is embedded in the sampling device colloid, for taking out the sample, unscrew sampling device both sides screw 240, connect 250 boards and lift off, remove the left second frame width direction degree of freedom of sampling device, make the colloid expose through recess and protruding separation with left second frame afterwards, tear top layer and bottom adhesive tape with tweezers, peel off the unnecessary colloid of both sides, take out the experimental adhesive tape of middle part 2 mm.
The invention also provides a method for optimizing the pre-buried position of the adhesive tape, which adopts a finite element simulation analysis method to select and position the pre-buried position under the conditions of not interrupting the continuity of the adhesive body, not influencing the overall strength and being capable of accurately reflecting the borne load, and comprises the following steps:
step one, establishing a geometric model;
and establishing a geometric model according to the marked size according to a CAD drawing of a high-speed motor train unit of a certain model.
Step two, carrying out grid division;
carrying out meshing on the geometric model of the vehicle window, wherein finite element meshing adopts a method from bottom to top topology creation from a 2D mesh to a 3D hexahedral mesh; after the model is geometrically cleaned and chamfers are eliminated, two-dimensional square grid division is carried out on the surface of the model, the two-dimensional grid adopts a symmetrical drawing method, after the vehicle window 1/4 is completely divided by taking the horizontal and vertical coordinate axes as symmetrical lines, grid encryption is carried out on the main stress area of the edge of the window frame so as to improve the analysis precision, and then the two-dimensional grid of the whole window is symmetrically drawn. The shape of the hexahedral unit is controlled through the 2D unit, the grid quality inspection is carried out after the two-dimensional division is finished, the Jacobian is controlled within 0.3, the length-width ratio is controlled within 1.2%, the square is used as the best, and the minimum size of the grid is controlled to be larger than 1 mm. Then, a solid map mapping module is used for stretching a hexahedral mesh on the basis of the square 2D mesh at one time, the redundant 2D mesh on the original surface layer is deleted, and the mesh division of the car window is finished; model meshing information is for adopting eight node hexahedron units to divide the mesh, and entity unit size is about 1.5mm, and finite element model includes: 943252 nodes, 706000 entity units;
thirdly, applying a vertical load to the window body, and performing finite element analysis and calculation;
endowing a window frame with a stainless steel material and endowing a window with a glass material, wherein the elastic modulus of the stainless steel material is 206GPa, and the Poisson ratio is 0.3, and the elastic modulus of the glass material is 55GPa, and the Poisson ratio is 0.25; then assembling the two; the bonding structure is calculated according to the working condition and the pneumatic uniform load specified by the EN12663 standard, the tunnel working condition of the high-speed motor train unit is the most dangerous working condition, the pneumatic uniform load is set to be 6000Pa at the moment, the vertical uniform load is applied to the surface of the window body glass, the vibration displacement of the window is restricted by the related freedom degree in the running process, and finally a window finite element analysis model is established.
Determining a pre-buried position according to an analysis result;
determining the pre-embedded position of the sampling device by analyzing the stress distribution cloud picture and the deformation cloud picture of the bonding glue layer in the calculation result; the pre-buried position selection principle is that a region with the largest approaching stress as much as possible is selected under the condition that the structural strength is not influenced, the whole pre-buried part is in a region with uniform stress, namely the same stress level, the stress distribution consistency is ensured, and finally the simulation pre-buried position selection result is applied to the actual placing position of the pre-buried part during gluing;
according to the finite element simulation calculation result, the maximum stress sigma borne by the adhesive layer of the bonding structure is 0.52Mpa, the position is positioned at the lower edge of the car window, the deformation value of the maximum deformation position is 0.241mm, and the position is positioned at the upper edge of the car window;
therefore, the pre-buried position is selected at the left edge or the right edge of the side part of the window body; the two positions are selected to be closer to the maximum stress area and keep a certain distance from the maximum stress area, so that the strength of the window body is prevented from being reduced due to over-close. On the other hand, stress distribution on the left edge and the right edge is uniform, so that the test piece can be positioned under the same stress level, and the effect of an aging test is ensured.
In the production, the window glass is bonded by adopting a manual gluing mode, a bonding process is adopted, and an adhesive which can meet the process requirement is selected according to the factors of the size, the thickness and the weight of a window. The bonding process is as follows: cleaning a substrate, grinding and installing a front window glass, protecting, brushing an activating agent, brushing a primer, gluing, adhering the front window, drying, cleaning the substrate, protecting, brushing the activating agent, brushing the primer, gluing, scraping and drying.
The method comprises the following specific steps: protecting the periphery of the bonding part of the front window and the vehicle body window frame by using a paper-based adhesive tape; brushing the adhesive on the bonding part by using a clean brush to dip an activating agent; and (3) brushing along one direction, wherein the brushing is required to be uniform and has no leakage, and the activator brushed at the bonding part along one direction is wiped cleanly by using clean non-woven fabric. The activating agent is dried for 30 min. And (3) dipping the primer in a clean brush to brush the primer on the corresponding bonding part, and brushing the primer along one direction, wherein the brushing is required to be uniform and has no missing coating. The primer is dried for 30 min. The thickness of the glue layer needs to be calculated in advance before glue is applied, so that the size of a glue nozzle of a glue gun can be cut; after gluing, drying for a period of time, after the colloid is slightly solidified, performing colloid pre-embedding according to a finite element position optimization analysis result, fastening a mold on the colloid at a fixed position of a colloid side part of a window frame, immersing the mold, filling a sampling device with the colloid, coating Teflon coatings on a side wall of 2mm in the central length direction of the sampling device and the outer periphery of the sampling device except the upper surface and the lower surface, and treating the Teflon coatings to prevent an adhesive from being adhered to the sampling device, thereby influencing the subsequent manufacture of a dumbbell-shaped test piece and the cleaning of the sampling device. The thickness of the sampling device is 4mm and is lower than the thickness of the sealant of the window frame, and the part which is not full after pre-burying is filled with the sealant by using a scraper after pre-burying is finished. And then, installing the vehicle window, hoisting the vehicle window to the bonding surface of the window frame of the vehicle body by using a lifting appliance, enabling the vehicle window and the bonding surface to be tightly attached, adjusting the glass to enable the glass to be uniform with the peripheral gap of the vehicle body, and forcibly pressing the vehicle window until the outer edge of the vehicle window glass is matched with the outer edge of the vehicle body. And after the bonding is finished, the window glass and the vehicle body are tightly bound by using a binding device. After all windows were fully bonded for 7 days, a putty seal at the seam was made. And splicing the shading paper tape at the edges of the glass and the covering laminated board. The surface was cleaned with a cleaner applied to a clean nonwoven with 5 minutes of aeration. The seal is cleaned with an activator, the adhesive is smoothed with a smoothing agent, and the masking tape is removed immediately after sealing and smoothing the gap. After the glass is lifted and the gap is sealed by putty, the vehicle window is protected by a clamp and a lath, the front window is protected by a belt, and the belt is prevented from continuously deforming. And finally, drying the adhesive, strictly prohibiting the operation content of violent vibration of the vehicle body caused by a pull-back vehicle and the like after the drying is started, and pasting a warning sign on the window. And (5) after drying is finished. And (5) removing the tightener. And (3) cutting off the glue overflowing from the bonding part by using a wallpaper cutter, wiping the window frame and the front window glass of the vehicle body at the bonding part by using clean non-woven fabric dipped with primer, and drying for 5 min. The substrate surface is required to be free of oil stains, dust, moisture, rust, and the like.
When need provide the tertiary of vehicle bonding structure operation mileage and repair, the level four is repaiied and the adhesive tape is repaiied to the level five, cut out pre-buried sampling device in sealed glue of window frame, strike off the peripheral colloid of sampling device totally with the scraper, pierce through the preformed hole with miniature drill bit afterwards, stretch into superfine diamond wire or steel saw blade one end in the drilling along sampling device length direction fluting department from top to bottom respectively cut, surely go out the thick sample of sampling device middle part adhesive tape 2mm, sample length is 16mm than sample length for the standard this moment, the width is 8mm that the standard requires, consequently, need further cut length direction size. And the length direction cutting positioning uses the surface scale mark of the sampling device, and the colloid cutting in the width direction is carried out along the scale mark by using a common sharp graver to obtain the standard sample required by the test size. Then the screws on the two sides are screwed out, the connecting plate is dismounted, the left part and the right part are separated through the pulling and inserting mechanism to expose the colloid, the top layer adhesive tape or the bottom layer adhesive tape is torn by using tweezers, and the test adhesive tape with the middle part of 2mm is taken out.
Randomly extracting an embedded sampling device from the vehicle window of the three-stage repair, four-stage repair and five-stage repair mileage of the high-speed motor train unit, cutting out a test sample with a required size according to the method, loading the dumbbell-shaped test piece by using an electronic universal testing machine under the quasi-static tensile action until the test piece is broken and damaged, capturing the deformation of the adhesive dumbbell-shaped test piece by using a non-contact extensometer, recording the stress-strain curve of the adhesive dumbbell-shaped test piece, obtaining the residual strength of the adhesive dumbbell-shaped test piece, comparing the residual strength with a laboratory strengthened aging curve, and primarily establishing an approximate relation between the driving mileage and the cycle number of an artificial accelerated; based on the approximate relation, selecting a proper safety factor, designing a strengthening test, predicting and evaluating the natural aging failure behavior of the car window bonding structure, and determining a proper maintenance scheme.
Predicting the service life of a subsequent bonding structure:
the method comprises the following steps: and (3) carrying out temperature cycle-dynamic load cycle coupling dynamic tests on the anodic treatment aluminum alloy bonding test piece according to alternating climate test conditions and a dynamic load spectrum, carrying out tensile tests on the bonding test piece by using a tensile testing machine after the tests are finished, and measuring the residual strength of each bonding test piece after the coupling dynamic tests. After the test is finished, individual invalid test data are eliminated, and the average value of each group of test data is taken as the residual strength T, T of the bonding test piece under the dynamic load spectrum cycle number Q1Namely the number Q of cycles of the dynamic load spectrum under the condition of alternating climate test1Residual strength of the adhesive layer of the time-bonding test piece, TnRepresenting the number of cycles Q of the dynamic load spectrum under the test condition of alternating climatenThe residual strength of the adhesive layer of the test piece is bonded.
Step two: under the condition of alternating climate test, statistical analysis is carried out on the failure mode and the residual strength result of the metal bonding test piece under the condition of coupling the temperature and different dynamic load cycle times; and drawing a relation curve between the residual intensity T (phi (Q)) and the cycle times Q of different dynamic load spectrums under the alternating climate test condition and the temperature and humidity coupling environment, and summarizing regularity. And fitting a curve by taking the dynamic load cycle number Q as an independent variable and the residual intensity T as a dependent variable to obtain a functional relation of T ═ phi (Q).
Step three: extracting adhesive tapes of the car window bonding structure of different running mileage of the high-speed motor train unit, and selecting running L of the high-speed motor train unit1、L2、L3、…、LnThe adhesive tape on the kilometer-hour vehicle window adhesive structure is tested to have the residual strength of T through a tensile test1、T2、T3、…、TnAnd the fitted curve establishes an aging relation curve T between the residual intensity T and the running kilometer number L of the high-speed motor train unit, wherein the aging relation curve T is phi (L).
Step four: by combining the functional relationship between T ═ phi (Q) and T ═ phi (L), an approximate relationship L ═ phi (Q) between the driving range L and the number of cycles Q of the dynamic load spectrum under alternating climate test conditions was initially established.
Step five: based on the approximate relation L ═ phi (Q), the bonding test piece is subjected to a test of the cycle times Q of the dynamic load spectrum under the alternating climate test condition, and the window bonding structure of the bonding test piece equivalent to the high-speed motor train unit running for L kilometers is calculated. And obtaining the residual strength of the adhesive tape of the bonding test piece through a tensile test, wherein the residual strength is approximately equal to that of the adhesive tape of the window bonding structure when the high-speed motor train unit runs for L kilometers. And predicting and evaluating the aging failure behavior of the window bonding structure, and providing experimental and theoretical support for the strength design of the window bonding structure of the high-speed motor train unit.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a rubber strip sample sampling device for bonding structure aging testing which characterized in that includes:
one end of the first frame is vertically provided with a first bulge, the other end of the first frame is vertically provided with a first groove, and the middle part of the first frame is sunken towards the inner side;
one end of the second frame is vertically provided with a second groove, the other end of the second frame is vertically provided with a second bulge, and the middle part of the second frame is sunken towards the inner side;
the first bulge is matched with the second groove, and the first groove is matched with the second bulge, so that the first frame and the second frame are detachably connected to form a whole frame;
the first slot opening position is formed in the side faces of the inner side and the outer side of the first frame and the second frame;
the second slotting position is arranged on the side surfaces of the inner side and the outer side of the first frame and the second frame and is arranged at intervals with the first slotting position;
and the reserved holes are respectively arranged at two ends of the first slot opening position and the second slot opening position.
2. The adhesive tape sample sampling device for the aging performance test of the bonded structure as claimed in claim 1, wherein the prepared hole is tangent to the groove.
3. The strip specimen sampling device for bonded structure aging testing of claim 2, further comprising:
and the two connecting plates are detachably arranged outside the two end surfaces of the integral frame.
4. The strip specimen sampling device for bonded structure aging testing of claim 3, wherein the interval is 2 mm.
5. The strip sampling apparatus for bonded structure aging testing of claim 4, wherein the frame is coated with Teflon coating on the whole periphery.
6. The adhesive tape sample sampling device for the aging performance test of the bonded structure as recited in claim 5, wherein the frame is a dumbbell-shaped structure as a whole.
7. The adhesive tape sample sampling device for the aging performance test of the bonded structure as claimed in claim 6, wherein the top of the first frame and the second frame are provided with scales.
8. A method for sampling a rubber strip sample for a bonding structure aging performance test, which uses the rubber strip sample sampling device for the bonding structure aging performance test as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
step 1, cutting the outline of a sampling device;
step 2, positioning the outline of the sampling device on a test bed, aligning a preformed hole on one side of the sampling device by using a drilling tool, and drilling from one side of the sampling device to the other side to obtain the sampling device with through holes at two ends;
step 3, sequentially extending a cutting tool into the through hole at one end of the outline of the sampling device, and cutting from one end to the other end along the trench opening position;
and 4, detaching the first frame and the second frame, and removing and tearing off redundant adhesive tapes to obtain the target sample.
9. An adhesive tape pre-embedding position optimization method for using the adhesive tape sample sampling device for the adhesive structure aging performance test of any one of claims 1 to 7 is characterized in that the pre-embedding position of the sampling device is optimized, and the method comprises the following steps:
determining a target window size; applying a vertical load to the adhesive layer of the window body, and carrying out analysis and calculation; determining a pre-embedding position according to an analysis result;
and determining the pre-embedded position as the side edge of the vehicle window close to the maximum stress area and the maximum deformation area.
10. The method for optimizing the embedding position of the adhesive tape according to claim 9, wherein the maximum stress borne by the adhesive layer of the vehicle window is 0.52Mpa, and the deformation value of the maximum deformation position is 0.241 mm.
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| KR20140124526A (en) * | 2013-04-17 | 2014-10-27 | 주식회사 엘지화학 | Method of manufacturing sample for mesuring adhesive strength of cured film and method of mesuring adhesive strength by using the sample |
| CN107121315A (en) * | 2016-02-25 | 2017-09-01 | 陕西飞机工业（集团）有限公司 | A kind of 180 ° of peel strength preparation method of sample of fluid sealant |
| CN108414438A (en) * | 2017-02-09 | 2018-08-17 | 上海汽车集团股份有限公司 | Sample and test method for 90 ° of peeling strength of adhesive joint experiments |
| CN108152097A (en) * | 2017-12-04 | 2018-06-12 | 中国航发北京航空材料研究院 | A kind of tooling for cutting 180 ° of peel test specimens of sealant |
| CN209841412U (en) * | 2019-04-18 | 2019-12-24 | 吉林大学 | A adhesive tape sample sampling device for bonding structure aging testing |
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