CN116541958A - Improved adhesive riveting composite connection process and optimization method - Google Patents

Improved adhesive riveting composite connection process and optimization method Download PDF

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CN116541958A
CN116541958A CN202310523692.7A CN202310523692A CN116541958A CN 116541958 A CN116541958 A CN 116541958A CN 202310523692 A CN202310523692 A CN 202310523692A CN 116541958 A CN116541958 A CN 116541958A
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rivet
adhesive
diameter
gasket
test
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苏亮
蔡鸿毅
闫卫兵
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Xiamen King Long United Automotive Industry Co Ltd
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Xiamen King Long United Automotive Industry Co Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
    • F16B19/04—Rivets; Spigots or the like fastened by riveting
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    • G01—MEASURING; TESTING
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
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Abstract

An improved adhesive-riveting composite connection process is characterized in that an annular gasket sleeved on a rivet is additionally arranged between two adhered substrates, the inner diameter D2 of the annular gasket is identical to the diameter D3 of the rivet, the rivet is ensured to pass through smoothly by design tolerance, and the area of the annular gasket is 1.5-2.0 times of the cross section area of the rivet. The optimization method of the composite connection process comprises the steps of designing and manufacturing a sticky rivet joint, carrying out a quasi-static tensile test on the sticky rivet joint, determining an optimal design scheme, and optimizing the design variable gasket height h1 and the rivet diameter D3. The invention establishes a method for optimizing the peak load of the adhesive rivet joint, optimizes the peak load of the adhesive layer and the peak load of the rivet by selecting key geometric design variables of the adhesive rivet joint, and finally realizes the coincidence of the peak load position of the adhesive layer and the peak load position of the rivet, so that the adhesive layer and the rivet are simultaneously disabled, thereby achieving the aim of improving the bearing capacity and the shock resistance of the adhesive rivet joint.

Description

Improved adhesive riveting composite connection process and optimization method
Technical Field
The invention relates to the technical field of automobile material connection, in particular to an improved adhesive riveting composite connection process and an optimization method.
Background
Further realizing the weight reduction of the automobile is an effective way for reducing the energy consumption of the automobile, which puts higher requirements on the materials and the structure of the automobile, and the diversification of the materials used by the automobile becomes a necessary trend at present, and the connection problem of various dissimilar materials gradually becomes a research hot spot.
The bonding connection technology has the advantages of uniform stress distribution, good appearance quality and the like, and has good fatigue resistance because the bonding technology has no problems of open pore deformation, thermal deformation and the like; however, since the adhesive used for the vehicle body structure is mostly thin, the damage energy absorbing effect may be slightly insufficient under some special working conditions, and in addition, the adhesive is easily aged, resulting in a reduction in connection reliability. Compared with bonding, the riveting connection technology has better energy absorption effect when being damaged, is not easy to age and has higher reliability, but when being singly used, the riveting can possibly cause electrochemical corrosion due to direct contact of the rivet and a metal material of a vehicle body. Therefore, considering a novel connection mode combining bonding and riveting, the defect of simple bonding and riveting can be effectively avoided, and the method is a feasible solution.
One technical difficulty in using the rivet bonding technique is how to precisely control the thickness of the glue layer, and most of the previous process methods are to select a proper diameter of glass beads or copper wires and uniformly arrange the glass beads or copper wires in a bonding area so as to achieve the effect of controlling the thickness of the glue layer. However, the adhesive and the rivet are adhered in the curing stage by adopting the method, which is not beneficial to the subsequent optimization flow.
In addition, research shows that the adhesive rivet joint often has two sections failure processes when breaking, the first section is that the adhesive layer breaks down, and the failure strength is higher this moment, and the failure displacement is shorter, and after the adhesive layer became invalid, next the rivet takes place to become invalid, and single rivet's intensity is more lower than the adhesive layer, but the failure displacement is longer, and energy-absorbing effect is good. At present, one of the reasons for limiting the wide application of the adhesive rivet joint is that the adhesive rivet joint can basically be judged to lose the bearing capacity after the adhesive layer fails, and the rivet is very little in the contribution of joint strength. Therefore, if the strength of the rivet can be added on the strength of the adhesive layer by a certain method, the two functions can be simultaneously exerted, and the mechanical property of the adhesive rivet joint is greatly improved.
Disclosure of Invention
The invention provides an improved adhesive riveting composite connection process and an optimization method, so that a glued substrate can obtain higher connection strength, and the aim of simultaneously invalidating an adhesive layer and a rivet of an adhesive riveting joint is fulfilled.
The invention adopts the following technical scheme:
an improved adhesive riveting composite connection process is characterized in that an annular gasket sleeved on a rivet is added between two adhered substrates, the inner diameter D2 of the annular gasket is the same as the diameter D3 of the rivet, the design tolerance ensures that the rivet smoothly passes through, and the area of the annular gasket is 1.5-2.0 times of the cross section area of the rivet; the rivet diameter D3 and the spacer thickness h1 are used as design variables, and the spacer thickness h1 is used to control the glue layer thickness to obtain the optimal connection strength.
The invention also provides an improved adhesive riveting composite connection process optimization method, which comprises the following steps:
step one, designing and manufacturing a sticking and riveting joint: selecting a proper annular gasket to control the thickness of the adhesive layer, then using an adhesive gun to uniformly coat the adhesive for vehicles on the bonding surfaces of two substrates, placing a bonding test piece on a designed special fixture to finish lap joint assembly, finally using a riveter to assemble a rivet with the diameter D3 in the bonding test piece, and curing according to requirements to finish the manufacture of a bonding rivet joint;
step two, performing a quasi-static tensile test on the adhesive rivet joint: placing the adhesive rivet joint on a tensile testing machine, acquiring a general load displacement curve of the adhesive rivet joint through an upper computer after the tensile test is finished, and respectively breaking the adhesive layer and the rivet when the adhesive layer and the rivet displace a1 and a2, wherein the load displacement curve has two peaks, so that the peak load is optimized;
step three, determining an optimization scheme: the method comprises the steps of preliminarily selecting a gasket height h1, a gasket inner diameter D2, a rivet height h2, a rivet diameter D3 and a substrate aperture D1 as design variables, applying a range to the gasket height h1 and the rivet diameter D3, and enabling a distance TPD between two peaks to be minimum by a target, wherein an adopted optimization model is as follows:
find DV＝(DV1，DV2，...，DV5) T
step four, optimally designing the height h1 of the variable gasket and the diameter D3 of the rivet: and (3) making a DOE scheme of experimental design, selecting gasket heights h1 and rivet diameters D3 with different sizes, sequentially manufacturing adhesive rivet joints, carrying out tensile shear test to obtain a load displacement curve, determining the distance TPD between a glue line fracture peak value and a rivet failure peak value, and searching the gasket height h1 and the rivet diameter D3 corresponding to TPD=0 as optimized design variables.
In a preferred embodiment, the center of the bonding area of the two substrates in the first step is provided with a hole directly D1 to accommodate the rivet.
In a preferred embodiment, the thickness of the adhesive layer in the first step is controlled by the height h1 of the annular gasket, the inner diameter and the outer diameter of the gasket are D2 and D6, and the inner diameter of the gasket is aligned with the apertures of the two substrates.
In a preferred embodiment, the two substrates in the first step need to be treated on their surfaces before being bonded, including sand blasting, wiping and sun-drying processes.
In a preferred embodiment, the above-mentioned step four finds the gasket height and rivet diameter corresponding to tpd=0, and the specific procedure is as follows:
(1) The test design scheme is formulated for the first time: the number of the selected design variables is 5, each variable takes n levels, and the test design method selects a full-factorial method;
(2) And (3) verifying the result of the first test design scheme: manufacturing n according to the established test design scheme 2 The method comprises the steps of (1) sequentially carrying out quasi-static tensile shear test on the adhesive rivet joints of the groups to obtain a load displacement curve of each adhesive rivet joint of the groups, and calculating the distance TPD between a breaking peak value of the adhesive layer and a failure peak value of the rivet; carrying out correlation analysis on the gasket height h1, the rivet diameter D3 and the TPD, and finding out the gasket height and the rivet diameter corresponding to the minimum TPD distance in the preliminary test scheme, and marking the gasket height and the rivet diameter as h1_opt1 and d3_opt1; performing half division on the preliminarily selected design variable interval by adopting a dichotomy method, and confirming interval ranges of the h1_opt1 and the D3_opt1;
(3) And (3) setting a test design scheme for the second time: making a test design scheme for the second time according to the new interval range, manufacturing a sticky rivet joint with a corresponding size, performing a tensile shear test, and searching a gasket height and a rivet diameter corresponding to the minimum TPD distance in the second test scheme, and marking the gasket height and the rivet diameter as h1_opt2 and D3_opt2; continuing to divide the design variable interval selected for the second time in half by adopting a dichotomy method, and confirming the interval range where the h1_opt2 and the D3_opt2 are positioned;
(4) Setting a test design scheme for the mth time: according to the mth test design scheme of the new interval range, manufacturing a sticky rivet joint with corresponding size to carry out a tensile shear test, searching the gasket height and the rivet diameter corresponding to the minimum TPD distance in the mth test scheme, and marking as h1_opt m And D3_opt m The method comprises the steps of carrying out a first treatment on the surface of the Verified that when the gasket height is h1_opt m And a rivet diameter of d3_opt m When the optimization target TPD=0 can be realized, and the fracture peak value of the adhesive layer and the failure peak value of the rivet coincide.
From the above description of the invention, it is clear that the invention has the following advantages over the prior art:
1. according to the invention, the annular gasket is added between the two base materials, so that the thickness of the adhesive layer can be effectively adjusted, and enough riveting force can be well ensured, thereby obtaining higher connection strength.
2. The invention establishes a method for optimizing the peak load of the adhesive rivet joint, optimizes the peak load of the adhesive layer and the peak load of the rivet by selecting key geometric design variables of the adhesive rivet joint, and finally realizes the coincidence of the peak load position of the adhesive layer and the peak load position of the rivet, so that the adhesive layer and the rivet are simultaneously disabled, thereby achieving the aim of improving the bearing capacity and the shock resistance of the adhesive rivet joint.
Drawings
Fig. 1 is an assembled top view of the adhesive rivet joint of the present invention.
Fig. 2 is an assembled front view of the adhesive rivet joint of the present invention.
FIG. 3 is a top view of a substrate of the present invention.
Fig. 4 is a front view of a substrate of the present invention.
Fig. 5 is a front view of the rivet of the present invention.
Fig. 6 is a top view of the annular gasket of the present invention.
Fig. 7 is a front view of the annular gasket of the present invention.
FIG. 8 is a graph of typical load-displacement for a rivet joint of the present invention.
FIG. 9 is a graph comparing load-displacement curves of the adhesive joint before and after optimization of the invention.
FIG. 10 is a graph showing a typical load-displacement curve of a rivet joint according to an embodiment of the present invention.
FIG. 11 is a graph showing the load-displacement curve of the rivet joint before and after optimization according to an embodiment of the present invention.
FIG. 12 is a graph showing the comparison of the performance of three joints after optimization according to the first embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent to one skilled in the art that the present invention may be practiced without these details. Well-known components, methods and procedures are not described in detail.
The invention provides an improved adhesive riveting composite connection process and provides an optimization method for key geometric parameters and material parameters of an adhesive riveting joint.
Referring to fig. 1 to 7, an improved adhesive-rivet composite joining process adds an annular spacer 3 to be fitted over a rivet 2 between two bonded substrates 1. The inner diameter D2 of the annular gasket is the same as the diameter D3 of the rivet, the design tolerance is to ensure that the rivet 2 passes smoothly, and the area of the annular gasket 3 is 1.5-2.0 times of the cross section area of the rivet 2. Rivet diameter D3 and shim thickness h1 are used as design variables, wherein shim thickness h1 is used to control the thickness of glue layer 4. On the premise that the corresponding bonding area of each rivet 2 is the same, the optimal connection strength can be obtained by optimizing the diameter of the rivet and the thickness of the gasket.
The invention also provides an improved adhesive riveting composite connection process optimization method, which comprises the following steps:
and designing and manufacturing the adhesive rivet joint. Referring to fig. 1 to 7, a hole 10 having a diameter D1 is formed in the center of the bonding region of the two substrates 1 to accommodate the rivet 2. Firstly, the surface of the base material is treated according to the bonding technical requirement, including the procedures of sand blasting, wiping with acetone, sun-curing and the like. In order to determine the thickness of the adhesive layer, an annular gasket 3 with the inner diameter D2, the outer diameter D6 and the height h1 is selected, and the gasket is aligned with the hole diameter of the base material 1 after acetone wiping. And then, uniformly smearing the adhesive on the bonding surface by using an adhesive gun, and placing the bonding test piece on a designed special fixture to complete the lap joint assembly. And finally, assembling the self-plugging rivet 2 with the diameter D3 into the bonding test piece by using a riveter, and curing the bonding joint according to the curing instruction of the adhesive to finish the manufacturing of the bonding joint.
And carrying out a quasi-static tensile test on the adhesive rivet joint. Placing the adhesive rivet joint on a tensile testing machine, taking care of placing gaskets at two ends of the adhesive rivet joint, and avoiding generating bending moment. After the tensile test is completed, a general load displacement curve of the adhesive rivet joint is obtained through an upper computer, and is shown in fig. 8. The glue layer and the rivet are broken when being respectively displaced by a1 and a2, the load displacement curve has two peaks, and the peak load needs to be optimized.
And determining an optimal design scheme. Selecting design variables according to the following principles: (1) Has obvious influence on the strain of the adhesive layer along the direction of external force; (2) has a significant effect on rivet strength. The preliminary determination is that the shim height h1 and inner diameter D2, rivet height h2 and diameter D3, and substrate aperture D1, which are used to control the size of the glue line, are critical geometric design variables. The substrate height H and length L3 are independent variables, and likewise L1 and L2 used to control the bond area dimensions have a significant effect on the cohesive rivet joint strength, but their changes do not have an effect on the bond line strain, which is determined by the definition of strain (the ratio of the bond line change length to the original length), so L1 and L2 are also independent variables. The constraint is to apply a range of shim heights h1 and rivet diameters D3, the latter rivet diameters D3 being selected from a number of values according to a mechanical design manual. The optimization objective is that the distance (The peak di stance, TPD) between the two peaks is minimal. The final optimization model is thus as follows:
find DV＝(DV1，DV2，...，DV5) T
a design of experiments (DOE 1) protocol was first formulated. The number of selected design variables is 5, each variable takes n levels, and the values are shown in table 1. The test design method selects a full factorial (full factor) method, and although the design variables are 5, only 2 variables are independent from each other, and the final design scheme has n in total 2 A scheme.
TABLE 1 variable value level of adhesive rivet joint design (DOE 1)
The first design of experiment (DOE 1) protocol results were validated. Manufacturing n according to the established test design scheme 2 And (3) sequentially carrying out quasi-static tensile shear test on the adhesive rivet joints, obtaining a load displacement curve of each adhesive rivet joint, and calculating the distance TPD between the adhesive layer fracture peak value and the rivet failure peak value. Correlation analysis was performed between the shim height h1, rivet diameter D3 and TPD. The shim height and rivet diameter corresponding to the minimum TPD distance in the preliminary test protocol was found and noted as h1_opt1 and d3_opt1. And (3) carrying out half division on the preliminarily selected design variable interval by adopting a dichotomy method, and confirming the interval range where the h1_opt1 and the D3_opt1 are positioned.
A second time a design of experiments (DOE 2) protocol was developed.Let h1_opt1 and d3_opt1 both lie in the upper half of the interval, i.eAnd (3) a test design (DOE 2) scheme is formulated for the second time according to the new interval range, as shown in the table 2, adhesive rivet joints with corresponding sizes are manufactured for tensile shear test, and the gasket height and rivet diameter corresponding to the time when the TPD distance is minimized in the second test scheme are searched and marked as h1_opt2 and D3_opt2. And continuing to divide the design variable interval selected for the second time into halves by adopting a dichotomy method, and confirming the interval range where the h1_opt2 and the D3_opt2 are positioned.
TABLE 2 design variable value level for second rivet joint (DOE 2)
And (5) setting up a test design (DOEm) scheme for the m th time. Let h1_opt1, h1_opt2, # h1_opt m-1 And d3_opt1, d3_opt2, & gt, d3_opt m-1 The ranges of the sections are all the upper half sections, namelyAccording to the new m-th test design (DOEm) scheme of the interval range, as shown in Table 3, adhesive rivet joints with corresponding sizes are manufactured for tensile shear test, and the gasket height and rivet diameter corresponding to the minimum TPD distance in the m-th test scheme are searched and recorded as h1_opt m And D3_opt m . Verified that when the gasket height is h1_opt m And a rivet diameter of d3_opt m When the optimization target tpd=0 can be realized, the fracture peak value of the adhesive layer and the failure peak value of the rivet coincide, and the schematic diagrams before and after optimization are shown in fig. 9.
TABLE 3 design variable value level for mth adhesive rivet joint (DOEm)
The following is a specific experimental example of an improved adhesive riveting composite connection process optimization method.
Example 1
An improved adhesive riveting composite connection process optimization method comprises the following steps:
first, designing and manufacturing a sticking and riveting joint. The center of the two pieces of substrate bonding area was provided with a hole of diameter d1=5 mm to accommodate the rivet. Firstly, the surface of a base material is treated according to the bonding technical requirement, and the treatment comprises the processes of sand blasting, wiping with acetone, sun-setting and the like. To determine the glue line thickness, an annular gasket with an inner diameter d2=5 mm, an outer diameter d6=6 mm and a height h1=0.2 mm was selected and aligned with the diameter of the substrate hole after acetone wiping was completed. And then, uniformly smearing the adhesive on the bonding surface by using an adhesive gun, and placing the bonding test piece on a designed special fixture to complete the lap joint assembly. And finally, assembling a blind rivet with the diameter of D3=5mm in the bonding test piece by using a riveter, and curing the bonding joint according to the curing instruction of the adhesive to finish the manufacturing of the bonding rivet joint.
And secondly, performing a quasi-static tensile test on the adhesive rivet joint. Placing the adhesive rivet joint on a tensile testing machine, taking care of placing gaskets at two ends of the adhesive rivet joint, and avoiding generating bending moment. And after the tensile test is finished, a general load displacement curve of the adhesive rivet joint is obtained through an upper computer, and is shown in fig. 5. The glue line and the rivet break when being displaced by 0.4mm and 1.63mm respectively, the load displacement curve has two peaks, and the peak load needs to be optimized.
Thirdly, determining an optimal design scheme. The preliminary determination is that the shim height h1 and inner diameter D2, rivet height h2 and diameter D3, and substrate aperture D1, which are used to control the size of the glue line, are critical geometric design variables. The constraint is to apply a range of shim heights h1 and rivet diameters D3, the latter rivet diameters D3 being selected from a number of values according to a mechanical design manual. The optimization objective is that the distance (The peak distance, TPD) between the two peaks is minimal. The final optimization model is thus as follows:
find DV＝(DV1，DV2，...，DV5) T
fourth, a design of experiments (DOE 1) scheme is formulated for the first time. The total number of selected design variables is 5, each variable takes 3 levels, and the value condition is shown in table 4. The test design method selects a full-factorial method, and although the design variables are 5, only 2 variables are independent from each other, and the total number of the final design schemes is 9.
TABLE 4 variable value level of adhesive rivet joint design (DOE 1)
Fifth, the first design of experiment (DOE 1) protocol results were validated. And manufacturing 9 groups of adhesive rivet joints according to a formulated test design scheme, sequentially carrying out quasi-static tensile shear test on the adhesive rivet joints to obtain a load displacement curve of each group of adhesive rivet joints, and calculating the distance TPD between the breaking peak value of the adhesive layer and the failure peak value of the rivet. The TPD distance was found to be the smallest when h1=0.1, d3=1.5, tpd=0.31. Continuing to divide the preliminarily selected design variable interval into halves by a dichotomy, namely
Sixth, a design of experiments (DOE 2) scheme is formulated for the second time. According to a new interval range, a second time design of experiment (DOE 2) scheme is formulated, as shown in table 2, and adhesive rivet joints with corresponding sizes are prepared for tensile shear test, so that the gasket height and rivet diameter corresponding to the minimum TPD distance in the second time test scheme are found, and when h1=0.2 and d3=1.5, tpd=0 is found. Therefore, when the height of the gasket is 0.2mm and the diameter of the rivet is 1.5mm, the obtained adhesive rivet joint load displacement curve can achieve the effect that the fracture peak value of the adhesive coincides with the failure peak value of the rivet.
TABLE 5 variable value of the adhesive rivet joint design level (DOE 2)
And seventh, verifying an optimization result test. The rivet load peak value and the glue line load peak value are overlapped after optimization, and the strength is improved by about 20% compared with the strength before optimization, as shown in FIG. 6. In order to further verify the accuracy of the optimized result, a riveted joint and an adhesive joint are manufactured according to the optimized result, the performance comparison of the three joints is shown in fig. 7, the strength of the riveted joint is found to be less than 2000N, the strength of the adhesive joint is about 7000N, the strength of the adhesive joint combined with the riveted joint is close to 10000N, the impact resistance is greatly improved, and the optimized result is effective and has application value.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.

Claims (6)

1. An improved adhesive riveting composite connection process is characterized in that: an annular gasket sleeved on the rivet is added between the two adhered substrates, the inner diameter D2 of the annular gasket is the same as the diameter D3 of the rivet, the design tolerance ensures that the rivet smoothly passes through, and the area of the annular gasket is 1.5-2.0 times of the cross section area of the rivet; the rivet diameter D3 and the spacer thickness h1 are used as design variables, and the spacer thickness h1 is used to control the glue layer thickness to obtain the optimal connection strength.
2. An improved adhesive riveting composite connection process optimization method is characterized by comprising the following steps:
step one, designing and manufacturing a sticking and riveting joint: selecting a proper annular gasket to control the thickness of the adhesive layer, then using an adhesive gun to uniformly coat the adhesive for vehicles on the bonding surfaces of two substrates, placing a bonding test piece on a designed special fixture to finish lap joint assembly, finally using a riveter to assemble a rivet with the diameter D3 in the bonding test piece, and curing according to requirements to finish the manufacture of a bonding rivet joint;
step two, performing a quasi-static tensile test on the adhesive rivet joint: placing the adhesive rivet joint on a tensile testing machine, acquiring a general load displacement curve of the adhesive rivet joint through an upper computer after the tensile test is finished, and respectively breaking the adhesive layer and the rivet when the adhesive layer and the rivet displace a1 and a2, wherein the load displacement curve has two peaks, so that the peak load is optimized;
step three, determining an optimization scheme: the method comprises the steps of preliminarily selecting a gasket height h1, a gasket inner diameter D2, a rivet height h2, a rivet diameter D3 and a substrate aperture D1 as design variables, applying a range to the gasket height h1 and the rivet diameter D3, and enabling a distance TPD between two peaks to be minimum by a target, wherein an adopted optimization model is as follows:
step four, optimally designing the height h1 of the variable gasket and the diameter D3 of the rivet: and (3) making a DOE scheme of experimental design, selecting gasket heights h1 and rivet diameters D3 with different sizes, sequentially manufacturing adhesive rivet joints, carrying out tensile shear test to obtain a load displacement curve, determining the distance TPD between a glue line fracture peak value and a rivet failure peak value, and searching the gasket height h1 and the rivet diameter D3 corresponding to TPD=0 as optimized design variables.
3. The improved adhesive-rivet composite connection process optimization method as set forth in claim 2, wherein: in the first step, holes which are directly D1 are respectively formed in the centers of the bonding areas of the two substrates so as to accommodate rivets.
4. An improved adhesive riveting composite connection process optimization method as claimed in claim 3, wherein: the thickness of the adhesive layer in the first step is controlled by the height h1 of the annular gasket, the inner diameter and the outer diameter of the gasket are D2 and D6, and the inner diameter of the gasket is aligned with the aperture of the two substrates.
5. The improved adhesive-rivet composite connection process optimization method as set forth in claim 2, wherein: in the first step, the surfaces of the two substrates need to be treated before bonding, including the processes of sand blasting, wiping and airing.
6. The improved adhesive-rivet composite connection process optimization method according to claim 2, wherein the step four is to find a gasket height and a rivet diameter corresponding to tpd=0, and the specific process is as follows:
(1) The test design scheme is formulated for the first time: the number of the selected design variables is 5, each variable takes n levels, and the test design method selects a full-factorial method;
(2) And (3) verifying the result of the first test design scheme: manufacturing n according to the established test design scheme 2 The method comprises the steps of (1) sequentially carrying out quasi-static tensile shear test on the adhesive rivet joints of the groups to obtain a load displacement curve of each adhesive rivet joint of the groups, and calculating the distance TPD between a breaking peak value of the adhesive layer and a failure peak value of the rivet; carrying out correlation analysis on the gasket height h1, the rivet diameter D3 and the TPD, and finding out the gasket height and the rivet diameter corresponding to the minimum TPD distance in the preliminary test scheme, and marking the gasket height and the rivet diameter as h1_opt1 and d3_opt1; performing half division on the preliminarily selected design variable interval by adopting a dichotomy method, and confirming interval ranges of the h1_opt1 and the D3_opt1;
(3) And (3) setting a test design scheme for the second time: making a test design scheme for the second time according to the new interval range, manufacturing a sticky rivet joint with a corresponding size, performing a tensile shear test, and searching a gasket height and a rivet diameter corresponding to the minimum TPD distance in the second test scheme, and marking the gasket height and the rivet diameter as h1_opt2 and D3_opt2; continuing to divide the design variable interval selected for the second time in half by adopting a dichotomy method, and confirming the interval range where the h1_opt2 and the D3_opt2 are positioned;
(4) Setting a test design scheme for the mth time: according to the mth test design scheme of the new interval range, manufacturing adhesive rivet joints with corresponding sizes to perform tensile shear test, and searchingThe gasket height and rivet diameter corresponding to the minimum TPD distance in the mth test protocol is denoted as h1_opt m And D3_opt m The method comprises the steps of carrying out a first treatment on the surface of the Verified that when the gasket height is h1_opt m And a rivet diameter of d3_opt m When the optimization target TPD=0 can be realized, and the fracture peak value of the adhesive layer and the failure peak value of the rivet coincide.
CN202310523692.7A 2023-05-10 2023-05-10 Improved adhesive riveting composite connection process and optimization method Pending CN116541958A (en)

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