CN115828459A - R angle failure mode control method for interlayer eccentric structure joint - Google Patents
R angle failure mode control method for interlayer eccentric structure joint Download PDFInfo
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- 239000011229 interlayer Substances 0.000 title claims abstract description 25
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- 238000009864 tensile test Methods 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
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- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
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Abstract
The invention relates to the technical field of simulation, in particular to a method for controlling R angle failure mode of a connector of an interlayer eccentric structure, which comprises the following steps: establishing a simulation model of the interlayer eccentric structure joint, performing stretching model constraint on the simulation model and setting displacement monitoring points; carrying out actual tensile test on the interlayer eccentric structure to obtain a load-displacement curve and a failure mode in the joint tensile process; carrying out simulation tensile test on the simulation model, obtaining a load-displacement curve of the simulation tensile test and analyzing a joint failure mode; and correcting the simulation model according to an actual test result, converting the displacement of the monitoring point into the eccentricity based on an accurate simulation result, outputting a load/eccentricity-displacement curve, and controlling the failure mode of the R angle of the joint by controlling the fluctuation range of the eccentricity. The invention realizes the control of different failure modes by simulating the tensile test analysis and changing the eccentric distance fluctuation condition.
Description
Technical Field
The invention relates to the technical field of simulation, in particular to a method for controlling R-angle failure mode of a connector of an interlayer eccentric structure.
Background
The sandwich eccentric structure is shown in figure 1 and is a two-staggered connection structure, after loads are applied to two ends of the structure, the dotted lines in the figure represent the direction of the loads, in the initial stage, the two dotted lines are parallel, and the distance between the two dotted lines is called the eccentricity; however, after the applied load is increased, the sandwich eccentric structure is subjected to the action of bending moment in the plate thickness direction to generate out-of-plane deformation, and with continuing to refer to fig. 1, the eccentricity is gradually reduced to zero along with the increase of the out-of-plane deformation.
The sandwich eccentric structure joint shown in fig. 2 is composed of a skin and a small-density core, has the advantages of low density and high bending rigidity, is widely applied to the fields of aerospace, marine ships, industrial equipment and the like, is formed into a sandwich eccentric structure in a bonding and riveting mode, and has the advantages that under the action of tensile load, as shown in fig. 2, the eccentricity is gradually reduced to zero, and then cracks are easily generated at the R corners of the joint and fail along with the expansion of the cracks;
the inventor researches and discovers that the crack failure of the R angle has two modes, namely a small-range expansion mode as shown in figure 3, after the joint generates the initial crack, the initial crack can expand in a small range, and the bearing capacity is greatly reduced at the moment, but the integral structure does not reach the serious damage degree; the other mode is a wide-range expansion mode as shown in fig. 4, the R angle of the mode is that after the initial crack is generated, when the joint load is greatly increased, the crack can be expanded in a wide range, so that the final failure is caused, and the integral structure reaches a severe damage degree; therefore, if the joint needs a high bearing load, the second failure mode is more appropriate, if the joint needs to be capable of bearing continuously after a crack is generated, so that instant catastrophic damage is avoided, and the first failure mode is more appropriate;
however, how to control the R-angle failure mode of a sandwich eccentric joint has not been addressed in the prior art.
Disclosure of Invention
In view of at least one of the above technical problems, the present invention provides a method for controlling R-angle failure mode of a joint with an eccentric interlayer structure, which adopts a simulation analysis mode to realize analysis and control of the failure mode.
According to a first aspect of the invention, there is provided a sandwich eccentric structure joint R angle failure mode control method, comprising the steps of:
establishing a simulation model of the interlayer eccentric structure joint, performing stretching model constraint on the simulation model and setting displacement monitoring points;
carrying out actual tensile test on the interlayer eccentric structure to obtain a load-displacement curve and a failure mode in the joint tensile process;
carrying out simulation tensile test on the simulation model, obtaining a load-displacement curve of the simulation tensile test and analyzing a joint failure mode;
comparing and analyzing the simulation and test results, verifying the accuracy of the simulation model or correcting;
and converting the displacement of the monitoring point into the eccentricity based on an accurate simulation result, outputting a load/eccentricity-displacement curve, and controlling the failure mode of the R angle of the joint by controlling the fluctuation range of the eccentricity.
In some embodiments of the invention, the simulation model of the sandwich eccentric structure is an adhesive bond, a mechanical bond, or a hybrid bond that is a hybrid of an adhesive bond and a mechanical bond.
In some embodiments of the present invention, when the simulation model of the interlayer eccentric structure is a hybrid connection, the adhesive layer uses a cohesion model to simulate deformation and damage failure of the adhesive layer, and the mechanical connection uses a solid unit for modeling.
In some embodiments of the invention, the computational method of the simulated tensile test is to display the quasi-static tension of the kinetically simulated joint.
In some embodiments of the present invention, when the simulation model is constrained by the stretching model, the constraint condition is that one side fixes and constrains all degrees of freedom, and the other side releases only the free end in the stretching direction.
In some embodiments of the present invention, when performing a simulation tensile test on a simulation model, a coupling constraint is adopted for the tensile, the constraint region is an actual clamping region of a tensile end, and a constraint reference point is located on an axial line in a joint tensile direction.
In some embodiments of the present invention, when performing a simulated tensile test on the simulation model, the friction coefficient is set according to the actual setting, and the load is loaded through a smooth curve.
In some embodiments of the invention, the displacement monitoring point is located in a middle region of the joint in the length direction.
In some embodiments of the invention, the evaluation of the fluctuation size of the eccentricity is performed by adopting a calculation method of dividing the fluctuation amplitude of the eccentricity by the joint span, and the fluctuation amplitude is small when the fluctuation amplitude of the eccentricity divided by the joint span is less than 0.5%, and is large otherwise.
In some embodiments of the present invention, the control method of the R-angle failure mode is: if a high-bearing joint is needed, the connection of the rivet or the glue layer is enhanced, so that the eccentricity fluctuation amplitude divided by the joint span is less than 0.5%; if it is desired that the joint continue to bear load after the initial crack has occurred, the rivet or glue line connection is weakened such that the eccentricity fluctuation divided by the joint span is not less than 0.5%.
The invention has the beneficial effects that: according to the invention, the R angle of the interlayer eccentric structure joint is subjected to modeling simulation analysis, a load/eccentricity-displacement curve is output, the positive correlation relation between the R angle failure mode and the eccentricity fluctuation is analyzed according to the load/eccentricity-displacement curve and the fluctuation condition of a monitoring point, and then the control of different failure modes is realized by changing the fluctuation condition of the eccentricity, so that an executable scheme is provided for the control of the R angle failure mode of the interlayer eccentric structure joint.
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 described in 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 schematic diagram of a variation structure of an eccentric distance of an interlayer eccentric structure during stretching in the background art of the present invention;
FIG. 2 is a schematic diagram of the eccentric distance variation structure of the interlayer eccentric structure joint during stretching in the background art of the present invention;
FIG. 3 is a schematic diagram of a small-range R-angle failure structure in the background art of the present invention;
FIG. 4 is a schematic diagram of a large-scale failure structure of the R-angle in the background art of the present invention;
FIG. 5 is a flowchart illustrating the steps of a method for controlling R-angle failure mode of a joint of an eccentric sandwich structure according to an embodiment of the present invention;
FIG. 6 is a load/eccentricity versus displacement graph for a single row of rivets for a sandwich eccentric structural joint in an embodiment of the present invention;
FIG. 7 is a load/eccentricity versus displacement graph for a double row rivet for a sandwich eccentric structured joint in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The inventor finds that after an initial crack is generated on an R angle of a connector of the interlayer eccentric structure, the eccentricity generates a fluctuation effect, and after the initial crack is generated on the R angle, if the fluctuation amplitude of the eccentricity is large, the connector is loose, the bearing capacity of the connector is reduced, after long-time continuous stretching, the load of failure of the R angle on the other side can be reached, the initial failure interval of the two R angles is long, at the moment, under the condition of low load, the crack is expanded in a small range, and after the expansion, although the bearing capacity is greatly reduced, the integral structure does not reach the degree of serious damage; when the fluctuation amplitude of the R angle of the interlayer eccentric structure is small, the R angle can be expanded only when the joint load is greatly increased, the crack expansion range is large in the state, and the failure time interval of the R angles at two ends is short; therefore, the inventor designs a failure mode for controlling the R angle of the joint by controlling the fluctuation range of the eccentricity after the R angle is analyzed to generate an initial crack in a model simulation mode, and the failure mode has great significance for the safety of the structure.
The R angle failure mode control method of the sandwich eccentric structure joint shown in the figures 5 to 7 comprises the following steps:
s10: establishing a simulation model of the interlayer eccentric structure joint, performing stretching model constraint on the simulation model, and setting a displacement monitoring point; in the embodiment of the present invention, the simulation software has various options, for example, abaqus software or other simulation software is selected, and a stretching model constraint is set, and the stretching constraint model is described in detail in the following section of the embodiment of the present invention;
s20: carrying out actual tensile test on the interlayer eccentric structure to obtain a load-displacement curve and a failure mode in the joint tensile process; the purpose of carrying out the actual tensile test is to verify the authenticity of the subsequent tensile test of the simulation model, and the failure mode of the R angle of the joint is conveniently observed through the actual tensile test;
s30: carrying out simulation tensile test on the simulation model, obtaining a load-displacement curve of the simulation tensile test and analyzing a joint failure mode; obtaining a tensile test result through a simulation tensile test, outputting a load-displacement curve with the same format as the actual tensile test, and conveniently observing and comparing whether the simulation result is close to the actual result;
s40: comparing and analyzing the simulation and test results, verifying the accuracy of the simulation model or correcting; if the results are the same or close to each other, the subsequent steps can be continued, and if the difference of the results is large, the parameters in the simulation software need to be adjusted;
s50: and converting the displacement of the monitoring point into the eccentricity based on an accurate simulation result, outputting a load/eccentricity-displacement curve, and controlling the failure mode of the R angle of the joint by controlling the fluctuation range of the eccentricity. As shown in fig. 6, the dashed line in fig. 6 represents the eccentricity to realize the representation of the load, and it can be seen that as the load increases, the eccentricity is gradually reduced, and the fluctuation range of the eccentricity is large in fig. 6, the load also fluctuates to a certain extent along with the fluctuation of the eccentricity, and the load is reduced at the initial stage of the fluctuation of the eccentricity, which indicates the position where the initial crack is generated at the R angle at one end, and after the fluctuation of the large amplitude of the eccentricity, the load is reduced for the second time after the progressive dynamic rise, and at this time, the position where the initial crack is generated at the R angle at the other end, and then the eccentricity is continuously reduced and fluctuated until the load is suddenly reduced, which indicates the final failure of the joint at this time; the analysis shows that the maximum value of the load is less than 70kN, which indicates that the failure mode is a small-range crack propagation mode, has longer failure time, can provide longer alarm preparation time for the structure, but is not suitable for bearing a large-load connecting structure; in order to verify the relationship between eccentricity and failure mode, as shown in fig. 7, the load/eccentricity-displacement graph of the R angle of the sandwich eccentric joint after adding one row of rivets is shown, and by comparing the graph with fig. 6, the fluctuation range of eccentricity of the structure is small, the interval of two times of load descending is short, but the bearable load is higher than that of a single row of rivets and reaches to be close to 110kN, and based on this, the failure mode is the second, namely the wide-range expansion mode; through the display of the simulation diagram, the R angle failure mode can be clearly obtained, and then designers can conveniently perform the pre-judgment and selection of the R angle failure mode according to requirements.
In the embodiment, the R angle of the connector of the sandwich eccentric structure is modeled, simulated and analyzed, a load/eccentricity-displacement curve is output, the positive correlation relationship between the R angle failure mode and the eccentricity fluctuation is analyzed according to the load/eccentricity-displacement curve and the fluctuation condition of a monitoring point, the control over different failure modes is realized by changing the fluctuation condition of the eccentricity, and an executable scheme is provided for the control over the R angle failure mode of the connector of the sandwich eccentric structure.
In the embodiment of the present invention, the connection structure of the simulation model of the sandwich eccentric structure has various forms, and may be an adhesive connection, a mechanical connection, or a hybrid connection, where the hybrid connection is a hybrid form of the adhesive connection and the mechanical connection. By means of the arrangement, simulation can be carried out according to different connection structure forms, and therefore the applicability of the method is improved.
In the embodiment of the invention, when the simulation model of the sandwich eccentric structure is a hybrid connection, wherein the adhesive layer uses a cohesive force model to simulate deformation and damage failure of the adhesive layer, the mechanical connection is modeled by using a solid unit, wherein the mechanical connection can be a screw, a bolt or a rivet, and the material of the mechanical connection comprises an elastic part and a plastic part.
In the embodiment of the invention, the calculation method of the simulation tensile test is to display the quasi-static tensile of the dynamic simulation joint. When the simulation model is subjected to stretching model constraint, the constraint conditions are that all degrees of freedom are fixed and constrained on one side, and only the free end in the stretching direction is released on the other side. The stretching adopts coupling constraint, the constraint area is an actual clamping area of the stretching end, and the constraint reference point is positioned on an axial line of the stretching direction of the joint. When the simulation model is subjected to a simulation tensile test, the friction coefficient is set according to the actual condition, and the load is loaded through a smooth curve. Through the setting of the tensile simulation mode, the result of the simulation tensile test is closer to the result of the actual tensile test, and the authenticity and the reliability of the simulation test are further improved.
In the embodiment of the invention, the displacement of the monitoring point is processed and converted into the eccentric distance by the displacement monitoring point located in the middle area of the joint in the length direction. The specific conversion mode is that the real-time eccentric distance = original eccentric distance-real-time displacement, wherein the original eccentric distance refers to the eccentric distance before the stretching is not performed, and the real-time displacement is obtained through monitoring of a monitoring point.
In the embodiment of the invention, the evaluation of the fluctuation size of the eccentricity is carried out by adopting a calculation mode of dividing the fluctuation amplitude of the eccentricity by the joint span, wherein the specific evaluation mode is that the fluctuation amplitude is small when the fluctuation amplitude of the eccentricity is divided by the joint span and is less than 0.5%, and the fluctuation amplitude is large otherwise. By means of the mode judgment, the connector can be used for connectors with various spans, and the applicability of judgment of R angle failure modes of the connector with the sandwich eccentric structure is improved. Specifically, in the embodiment of the present invention, the control method of the R-angle failure mode includes: if a high-bearing joint is needed, the connection of a rivet or a glue layer is enhanced, so that the eccentricity fluctuation amplitude divided by the joint span is less than 0.5%; if it is desired that the joint continue to bear load after the initial crack has occurred, the rivet or glue line connection is weakened such that the eccentricity fluctuation divided by the joint span is not less than 0.5%.
In the embodiment of the invention, the final failure mode of the R angle is controlled by changing the vibration amplitude of the eccentricity after the R angle generates the initial crack, and the judgment of the two failure modes is realized by the R called the fluctuation amplitude of the eccentricity; the control method has great significance for controlling the final failure mode of the clamping head with the sandwich eccentric structure.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A control method for R angle failure mode of a joint of an interlayer eccentric structure is characterized by comprising the following steps:
establishing a simulation model of the interlayer eccentric structure joint, performing stretching model constraint on the simulation model and setting displacement monitoring points;
carrying out actual tensile test on the interlayer eccentric structure to obtain a load-displacement curve and a failure mode in the joint tensile process;
carrying out simulation tensile test on the simulation model, obtaining a load-displacement curve of the simulation tensile test and analyzing a joint failure mode;
comparing and analyzing the simulation and test results, verifying the accuracy of the simulation model or correcting;
and converting the displacement of the monitoring point into the eccentricity based on an accurate simulation result, outputting a load/eccentricity-displacement curve, and controlling the failure mode of the R angle of the joint by controlling the fluctuation range of the eccentricity.
2. The R angle failure mode control method for the sandwich eccentric structure joint according to claim 1, characterized in that the simulation model of the sandwich eccentric structure is an adhesive joint, a mechanical joint or a hybrid joint, and the hybrid joint is a hybrid form of the adhesive joint and the mechanical joint.
3. The R-angle failure mode control method for the joint of the interlayer eccentric structure as claimed in claim 2, wherein when the simulation model of the interlayer eccentric structure is hybrid connection, the adhesive layer uses a cohesion model to simulate deformation and damage failure of the adhesive layer, and the mechanical connection uses a solid unit for modeling.
4. The R angle failure mode control method of the sandwich eccentric structured joint according to claim 1, characterized in that the calculation method of the simulation tensile test is a quasi-static tensile showing a dynamic simulation joint.
5. The R angle failure mode control method of the interlayer eccentric structure joint according to claim 1, wherein when the simulation model is subjected to the stretching model constraint, the constraint conditions are that all degrees of freedom are fixed and constrained on one side, and only the free end in the stretching direction is released on the other side.
6. The R angle failure mode control method of the interlayer eccentric structure joint according to claim 5, wherein when a simulation tensile test is performed on the simulation model, the tensile is constrained by coupling, the constrained region is an actual clamping region of a tensile end, and a constraint reference point is located on an axial line of the joint in a tensile direction.
7. The R angle failure mode control method of a sandwich eccentric structure joint according to claim 5, characterized in that, when a simulation model is subjected to a simulation tensile test, the friction coefficient is set according to the actual condition, and the load is loaded through a smooth curve.
8. The R-angle failure mode control method for a sandwich eccentric structural joint according to claim 1, wherein the displacement monitoring point is located in a middle region in the length direction of the joint.
9. The R angle failure mode control method of the sandwich eccentric structure joint according to claim 1, wherein the evaluation of the magnitude of the eccentricity fluctuation is performed by a calculation method of dividing the eccentricity fluctuation range by the joint span, and the fluctuation range is small when the eccentricity fluctuation range is divided by the joint span by less than 0.5%, and is large otherwise.
10. The R angle failure mode control method of the sandwich eccentric structure joint according to claim 9, characterized in that the R angle failure mode control method is as follows: if a high-bearing joint is needed, the connection of the rivet or the glue layer is enhanced, so that the eccentricity fluctuation amplitude divided by the joint span is less than 0.5%; if it is desired that the joint continue to bear load after the initial crack has occurred, the rivet or glue line connection is weakened such that the eccentricity fluctuation divided by the joint span is not less than 0.5%.
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