Energy consumption unit, collision-resistant behavior prediction method and equipment thereof and medium

Abstract

The invention relates to the technical field of engineering structure protection, in particular to an energy consumption unit, a collision-resistant behavior prediction method and equipment thereof and a medium. A collision-resistant behavior prediction method of an energy consumption unit comprises the following steps that a tank body finite element model before filling and a tank body finite element model after filling are established in a modeling system, and impact force and bearing force along the axis of the empty tank body finite element model are applied to the two ends of the tank body finite element model respectively; respectively giving calculation parameters to the empty tank body finite element model and the filling part finite element model in a modeling system, and determining solving time according to the compression displacement of the filled tank body finite element model; and solving and calculating in a modeling system to obtain a predicted deformation behavior-I and a predicted force-displacement response curve-I of the tank body finite element model before filling and a predicted deformation behavior-II and a predicted force-displacement response curve-II of the tank body finite element model after filling, and completing collision-resistant behavior prediction of the energy consumption unit.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering structure protection, and in particular to an energy consumption unit and a method, device and medium for predicting the crashworthiness behavior thereof. Background Art

[0002] As a typical thin-walled tubular structure, scrap metal cans are often used as energy absorbers because of their light weight and excellent mechanical properties, as demonstrated in the paper "Comparative analysis of energy absorption capacity of simple and multi-cell thin-walled tubes with triangular, square, hexagonal and octagonal sections" (A. Alavi Nia, M. Parsapour, Comparative analysis of energy absorption capacity of simple and multi-cell thin-walled tubes with triangular, square, hexagonal and octagonal sections, Thin-Walled Structures 74 (2014) 155-165.). Secondly, the annual consumption of scrap metal cans is huge and easy to obtain. They can be introduced as energy-consuming units into the field of engineering protection (such as automobile protection, civil engineering protection structures, aerospace energy dissipation structures, etc.), avoiding the disadvantage of traditional energy-consuming units that need to re-produce a large amount of steel as energy-consuming units, saving construction costs and material costs, and greatly reducing carbon emissions in the steel production process, which is in line with the call of the national energy conservation, emission reduction and sustainable development strategy in recent years.

[0003] According to a large number of experiments and theoretical analysis, a single thin-walled tubular structure has deficiencies in deformation mode, which is not conducive to the energy absorption efficiency of the structure. However, the energy dissipation performance per unit mass of a metal tank has great advantages, which shows that a metal tank is a kind of energy dissipation body that can be developed. In order to give full play to the energy dissipation performance of the tank, it is necessary to fill it with energy dissipation materials to further improve its crash resistance.

[0004] However, the arrangement of fillers inside the tank, especially fillers stacked with single particles, is computationally complex and cannot simulate the particle crushing and compaction behavior. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art in that when filling pieces are arranged inside a tank body, especially filling pieces stacked with single particles, the calculation is complex and the particle crushing and compaction behavior cannot be simulated, and to provide an energy-consuming unit and a method, device and medium for predicting its collision resistance behavior.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a method for predicting crashworthiness behavior of an energy consumption unit, wherein the energy consumption unit comprises a tank body to be tested, and a filling piece to be tested is arranged inside the tank body to be tested, and the method comprises the following steps:

[0008] S1. Establishing a finite element model of the tank body before filling and a finite element model of the tank body after filling in the modeling system, wherein the finite element model of the tank body before filling includes the finite element model of the empty tank body, and the finite element model of the tank body after filling includes the finite element model of the empty tank body and the finite element model of the filling part, wherein the finite element model of the filling part is arranged inside the finite element model of the empty tank body, and the finite element model of the filling part is a lightweight particle model, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body before filling, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body after filling;

[0009] S2. Assigning calculation parameters of the empty tank finite element model and the filling part finite element model respectively in the modeling system, and determining the solution time according to the compression displacement of the filled tank finite element model;

[0010] S3. Solve the calculation in the modeling system to obtain the predicted deformation behavior-Ⅰ and predicted force-displacement response curve-Ⅰ of the tank finite element model before filling, and the predicted deformation behavior-Ⅱ and predicted force-displacement response curve-Ⅱ of the tank finite element model after filling, and complete the prediction of the crashworthiness behavior of the energy-consuming unit.

[0011] Preferably, before step S1, the engineering stress-strain curve of the tank to be tested is obtained by stretching a standard tensile piece of the tank to be tested in an actual test, the engineering stress-strain curve of the tank to be tested is converted into a true stress-strain curve and then the elastic strain of the tank to be tested is subtracted to obtain the effective stress-strain curve of the tank to be tested, and a finite element model of the empty tank is established through the effective stress-strain curve of the tank to be tested.

[0012] Preferably, the effective stress-strain curve of the tank body to be tested comprises a first effective stress-strain curve and a second effective stress-strain curve, the first effective stress-strain curve is applicable to the tank body to be tested before necking, and the second effective stress-strain curve is applicable to the tank body to be tested after necking.

[0013] Preferably, in step S1, a tank body 3D model and a filler 3D model are first established in a modeling system according to the actual size of the tank body to be tested, and then the tank body 3D model is meshed in the form of 2D units, and the filler 3D model is meshed in the form of 3D hexahedral units; the mesh size of the tank body 3D model is 5-10 times the wall thickness of the tank body to be tested; the mesh of the filler 3D model is symmetrical along the axis of the tank body 3D model.

[0014] Preferably, the calculation parameters in step S2 include: unit types, material models and material parameters of the empty tank body finite element model, the filling piece finite element model, the fixed plate finite element model and the movable plate finite element model, the fixed plate finite element model is used to apply supporting force, and the movable plate finite element model is used to apply impact force.

[0015] Preferably, step S2 also includes: defining the contact relationship between the empty tank body finite element model and the fixed plate finite element model and the movable plate finite element model, respectively, the fixed plate finite element model is used to apply the supporting force, and the movable plate finite element model is used to apply the impact force; defining the contact relationship between two adjacent grids inside the empty tank body finite element model; defining the contact relationship between the empty tank body finite element model and two adjacent grids of the filling piece finite element model, and defining the contact relationship between two adjacent grids inside the filling piece finite element model.

[0016] Preferably, before step S1, a compression sample of the filling piece to be tested is compressed to obtain a stress-strain curve of the filling piece to be tested, the elastic modulus of the filling piece to be tested is obtained by fitting the stress-strain curve of the compression sample of the filling piece to be tested, and then a finite element model of the filling piece is established according to the elastic modulus of the filling piece to be tested.

[0017] The size of the compressed sample of the filling piece to be tested is determined according to the material of the filling piece to be tested.

[0018] An energy consumption unit comprises a tank body and a filling piece, wherein the filling piece is arranged inside the tank body, one end of the tank body is an impacted surface, and the other end is a supported surface, and the filling piece is a plurality of light granular components.

[0019] Lightweight granular components include: rock soil particles (such as perlite and ceramsite), EPS foam particles, waste rubber particles and polyurethane foam.

[0020] The filling rate of the filling piece is determined according to the usage scenario of the energy consumption unit and the material of the lightweight granular component.

[0021] In a third aspect, the present invention provides a computer device comprising at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for predicting the collision resistance behavior of an energy-consuming unit as described above.

[0022] In a fourth aspect, the present invention provides a computer-readable medium having stored thereon instructions executable by a processor, and when the instructions are executed by the processor, the processor executes a method for predicting the crashworthiness behavior of an energy-consuming unit as described above.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The crash-resistance behavior prediction method of an energy-consuming unit of the present invention accurately predicts the crash-resistance behavior of the crash-resistance behavior through the finite element method, provides an effective modeling and analysis method for the crash-resistance behavior used as the internal energy-consuming unit of the crash-resistance device, and can provide a basis for guiding the development, design and optimization of the corresponding crash-resistance device. This method overcomes the shortcomings of the prior art that when setting the filling piece inside the tank body, especially the filling piece of a single particle stack, the calculation is complicated and the particle crushing and compaction behavior cannot be simulated.

[0025] 2. An energy consumption unit of the present invention comprises a tank body and a filling piece inside the tank body. The tank body can be made of waste metal tank bodies, which has the advantages of low-carbon economy, excellent collision resistance and easy manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of a method for predicting crashworthiness behavior of an energy consumption unit of the present invention;

[0027] Figure 2 It is a schematic diagram of the energy consumption unit of the present invention. Figure 1 ;

[0028] Figure 3 It is a schematic diagram of the tank body of the present invention Figure 1 ;

[0029] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0030] Figure 5 yes Figure 3 The enlarged view of point B in the middle;

[0031] Figure 6 It is a schematic diagram of the tank body of the present invention Figure 2 ;

[0032] Figure 7 It is a schematic diagram of can body stretching;

[0033] Figure 8 It is a schematic diagram of the compression process of the filling structure;

[0034] Fig. 9 It is a schematic diagram of the energy consumption unit of the present invention. Figure 2 ;

[0035] Fig.10 It is a comparison chart of the predicted deformation behavior and the actual deformation behavior under the quasi-static axial compression simulation condition of the tank;

[0036] Fig.11 It is a comparison chart of the predicted deformation behavior and the actual deformation behavior under the working condition of the quasi-static axial compression simulation of the energy dissipation unit;

[0037] Fig.12 It is a comparison chart between the finite element prediction and the implemented experiment of the force-displacement response curve under the quasi-static axial compression simulation condition of the tank;

[0038] Fig.13 It is a comparison chart between the finite element prediction and the implemented experiment of the force-displacement response curve under the working condition of the quasi-static axial compression simulation of the energy dissipation unit;

[0039] Icon: 1-flange, 2-can body, 3-bottom cover, 4-filling piece, 5-pressure rod, 6-steel cylinder, 7-fixed rigid plate, 8-removable rigid plate. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0041] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0043] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0044] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0045] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0046] Example 1

[0047] like Figure 1 As shown, a method for predicting the crashworthiness behavior of an energy consumption unit adopted in this embodiment, the energy consumption unit comprises a tank body to be tested, and a filling piece to be tested is arranged inside the tank body to be tested, comprising the following steps:

[0048] S1. Establishing a finite element model of the tank body before filling and a finite element model of the tank body after filling in the modeling system, wherein the finite element model of the tank body before filling includes the finite element model of the empty tank body, and the finite element model of the tank body after filling includes the finite element model of the empty tank body and the finite element model of the filling part, wherein the finite element model of the filling part is arranged inside the finite element model of the empty tank body, and the finite element model of the filling part is a lightweight particle model, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body before filling, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body after filling;

[0049] S2. Assigning calculation parameters of the empty tank finite element model and the filling part finite element model respectively in the modeling system, and determining the solution time according to the compression displacement of the filled tank finite element model;

[0050] S3. Solve the calculation in the modeling system to obtain the predicted deformation behavior-Ⅰ and predicted force-displacement response curve-Ⅰ of the tank finite element model before filling, and the predicted deformation behavior-Ⅱ and predicted force-displacement response curve-Ⅱ of the tank finite element model after filling, and complete the prediction of the crashworthiness behavior of the energy-consuming unit.

[0051] Example 2

[0052] like Figures 2 to 13 As shown, a method for predicting crashworthiness behavior applicable to an energy-consuming unit is a detailed description of Example 1.

[0053] like Figure 2-Figure 5 As shown in FIG. 1 , a schematic diagram of a composite tank energy consumption unit provided in this example includes a tank body and perlite filled therein. The tank body is a typical three-mouth tank, which is composed of a tank body 2, a top flange 1 and a bottom cover 3. The tank body 2 is made of tin-plated steel (tinplate component), and the top flange 1 and the bottom cover 3 are made of aluminum. The particle size of the perlite 4 is 6 to 10 mm. Figure 2-Figure 5 The figure shows the geometry of the tank.

[0054] In this embodiment, the composite tank energy consumption unit is a tank with a filling member disposed therein.

[0055] Before implementing finite element prediction in the embodiment of the present invention, the material properties of the tank body and the perlite structure must first be determined. The tank body is made of steel, and the density of steel is generally 7850 kg / m 3 , the elastic model is 200GPa, the Poisson's ratio is 0.3; the top flange 1 and the bottom cover 3 are made of aluminum, and the density of aluminum is 2770kg / m 3 , elastic modulus is 73GPa, Poisson's ratio is 0.33; the elastic modulus of perlite structure is obtained according to the compression test after perlite 4 stacking, the Poisson's ratio is generally 0.25 when the soil particles are in a hard state, the tensile stress threshold (TSC) is recommended to be 0.04MPa, and the bulk density is calculated according to the following formula:

[0056]

[0057] Among them, m f is the mass of the composite tank filled with perlite, m k is the mass of the empty tank, V k is the volume of the empty tank; the particle size of the perlite 4 in this embodiment is 6 to 10 mm, and the bulk density is about 190 kg / m 3 .

[0058] Further, such as Figure 7 The figure shows the process of making a standard tensile test piece of the can body 2 by cutting along the circumferential direction. Figure 6 The dotted line is the cutting area. Two or more test pieces are required to eliminate the adverse test deviation. Since there may be slight differences in wall thickness and manufacturing process, the cross-sectional dimensions used for input are obtained through actual measurement and are calculated with a precision of 0.0025s. -1The engineering stress-strain curve is obtained by tensile testing at a strain rate of . The aluminum materials of the top flange 1 and the bottom cover 3 cannot be made into tensile specimens due to their small quantity and they hardly participate in deformation. Their engineering stress-strain curves are derived from the public data of aluminum materials in the corresponding literature. For metal materials, their engineering stress-strain curves need to be converted into true stress-strain curves. The effective stress-strain curve is obtained by removing the elastic strain from the true stress-strain curve. The true stress-strain curve of metal materials is divided into two stages before and after necking. Before necking, the relationship between the true stress-strain and the engineering stress-strain can be calculated by the following formula:

[0059] σ t =σ e (ε e +1)

[0060] ε t =ln(ε e +1)

[0061] Among them, σ t With ε t Respectively represent the true stress and strain of the two metal materials; σ e With ε e Respectively represent the engineering stress and strain of the two metal materials. After the material enters the necking stage, the cross-sectional area of ​​the specimen continues to decrease, and the actual stress value on the cross section will continue to increase. At this time, the true stress-strain calculation relationship before necking is no longer applicable. Therefore, the true stress-strain of the steel in the post-necking stage is calculated by the following formula:

[0062]

[0063] n=ln(1+A g )

[0064] C=R m (e / n) n

[0065] Among them, A g is the ultimate tensile stress R m The corresponding maximum uniform strain, e is the natural logarithmic constant. In the test, if only the ultimate stress R is obtained m , A g It can be determined by the following empirical formula:

[0066] A g =1 / (0.24+0.01395R m )

[0067] Furthermore, Figure 7The figure is a schematic diagram of the compression of the perlite structure, which includes perlite 4, pressure rod 5, and steel cylinder 6. The diameter of the steel cylinder 6 is 150 mm, and the perlite stacking height is 100 mm. The force-displacement curve of the perlite structure is obtained at a compression rate of 5 mm / min. The direction of the arrow is the compression direction, and its stress-strain curve is calculated by the following formula:

[0068]

[0069] Among them: F z is the compression reaction force of the perlite structure, A z is the cross-sectional area of ​​the steel drum, d z is the compression displacement of the compressed perlite structure, h z is the stacking height of the perlite structure. The elastic modulus is obtained by linear fitting the linear segment of the stress-strain curve. The elastic modulus of the perlite structure in this embodiment is 2.99 Mpa.

[0070] Finally, the determined performance parameters of the composite tank material to be predicted are applied to the finite element analysis method for simulation to predict the crashworthiness behavior of the composite tank based on the quasi-static axial compression test, such as Fig. 9 The specific implementation process is as follows:

[0071] Step S1: Create a geometric model in the 3D modeling software Solidworks, including a tank structure and a perlite structure. The perlite structure is used to fill the tank structure. The tank to be tested consists of a tank body 2, a top flange 1 and a bottom cover 3. The structure is shown in the figure. Figure 3-Figure 5 As shown, the wall thickness is 0.2 mm; the perlite particles are stacked as a whole structure, and the overall solid structure is established according to the boundary shape and size of the tank.

[0072] Step S2: With reference to the test results, the geometric models of the fixed rigid plate 7 and the movable rigid plate 8 are established in the 3D modeling software Solidworks. The fixed rigid plate 7 and the movable rigid plate 8 have the same size, which is 85 mm × 85 mm × 10 mm (length × width × thickness). The fixed rigid plate 7 is placed on the top of the tank body, and the movable rigid plate 8 is placed on the bottom of the tank body, and the centering process is performed.

[0073] Step S3: According to the test conditions, the positions of the geometric models are matched in the Hypermesh finite element pre-processing software, including two model conditions:

[0074] (1) Quasi-static axial compression simulation of the tank;

[0075] (2) Quasi-static axial compression simulation of composite tank.

[0076] Step S4: Mesh each geometric model in the Hypermesh finite element pre-processing software, including the tank body to be tested, the perlite structure and the rigid plate. Each part of the tank body to be tested is meshed with 2d units, and the mesh size is generally 5-10 times the wall thickness, the aspect ratio (Aspect) is not greater than 5 and is recommended to be as close to 1 as possible, the Jacobian (Jacobian) is recommended to be greater than 0.6, and the unit deformation (Warping) should be minimized. For a more accurate solution, the overall mesh size is controlled at about 1mm; the perlite structure is meshed with 3d hexahedral units, and the structure is divided into a quarter to ensure that the overall structure mesh is symmetrical, the aspect ratio (Aspect) is not greater than 5 and is recommended to be as close to 1 as possible, and the Jacobian (Jacobian) is recommended to be greater than 0.6. For a more accurate solution, the overall mesh size is controlled at about 3mm.

[0077] Step S5: Assign unit types to the tank, perlite and rigid plate to be tested. The tank to be tested adopts the Shell section type, the default Belytschko-Tsay unit form, and defines the unit thickness of the tank; the perlite structure and rigid plate both adopt the Solid section type.

[0078] Step S6: Assign material models and material parameters to the tank body, perlite and rigid plate to be tested. The tank body 2, top flange 1 and bottom cover 3 all use piecewise linear plastic material model (MAT_PIECEWISE_LINEAR_PLASTICITY, MAT024); the perlite structure uses compressible foam material model (MAT_CRUSHABLE_FOAM, MAT063); and assign the determined material parameters to the tank body and perlite structure one by one.

[0079] Furthermore, the rigid plate adopts the rigid body material model (Rigid, MAT020), and the density of steel is generally 7850kg / m 3 , the elastic model is 200 GPa and the Poisson's ratio is 0.3.

[0080] Step S7: According to the test and model conditions, define the contact relationship between the components:

[0081] (1) For the quasi-static axial compression simulation of the tank body, the contact relationship between the tank body and the rigid plate is defined: the "CONTACT_AUTOMATIC_SURFACE_TO_SURFACE" contact relationship is defined between the tank body and the fixed rigid plate 7 and the movable rigid plate 8, and the "CONTACT_AUTOMATIC_SINGLE_SURFACE" contact relationship is adopted between the inside of the tank body;

[0082] (2) For the quasi-static axial compression simulation of the composite tank, the contact relationships between the composite tank and the rigid plate are defined: the “CONTACT_AUTOMATIC_SURFACE_TO_SURFACE” contact relationship is defined between the composite tank and the fixed rigid plate 7 and the movable rigid plate 8, the “CONTACT_ERODING_SINGLE_SURFACE” contact relationship is defined between the composite tank and the interior of the composite tank, and the “CONTACT_INTERIOR” contact relationship is used to perform a supplementary contact check on the perlite structure.

[0083] Step S8: According to the actual test situation, the boundary constraint conditions and displacement load definition are applied to the movable rigid plate 8. Among them, the top fixed rigid plate 7 constrains all degrees of freedom; the bottom movable rigid plate 7 constrains all degrees of freedom except vertical displacement; the displacement loading speed in the simulation can be amplified according to the test situation, and the kinetic energy needs to be less than 5% of the internal energy.

[0084] Step S9: Define the solution time according to the compression displacement of the test.

[0085] Step S10: According to steps S1 to S9, a quasi-static axial compression simulation finite element model of the tank body is solved and calculated.

[0086] Step S11: extract the calculation results of the quasi-static axial compression simulation of the tank body, and extract the deformation behavior and force-displacement response of the result file.

[0087] Step S12: According to steps S1 to S9, a quasi-static axial compression simulation finite element model of the composite tank body is solved and calculated.

[0088] Step S13: extract the quasi-static axial compression simulation solution calculation results of the composite tank for comparison and verification, and extract the deformation behavior and force-displacement response of the result file.

[0089] Steps S5 to S9 are processed using Ls-dyna finite element pre-processing software.

[0090] Steps S10 and S12 are processed using Ls-run finite element post-processing software.

[0091] Steps S11 and S13 are processed using Ls-dyna finite element post-processing software.

[0092] Fig.10 and Fig.11 The comparison between the deformation behavior predicted by the embodiment of the present invention and the deformation behavior obtained by the experiment is listed. Fig.12 and Fig.13 The force-displacement response predicted by the embodiment of the present invention and the force-displacement response obtained by the experiment are listed for comparison, and both show a high degree of consistency.

[0093] The results show that the prediction method proposed in the embodiment of the present invention can accurately simulate the crashworthiness behavior of the composite tank.

[0094] Beneficial effects of the embodiments of the present invention:

[0095] (1) The composite beverage can energy consumption unit provided by the present invention uses economical and environmentally friendly rock soil particles to fill recyclable waste metal beverage cans, has excellent collision resistance, is lightweight and easy to manufacture, and provides a new way for the development of low-carbon economic anti-collision devices.

[0096] (2) The composite beverage can energy consumption unit modeling method provided by the present invention is simple and efficient, and the finite element simulation and test required for verification are low in cost and easy to implement, which greatly reduces the difficulty of modeling calculation and improves the simulation efficiency.

[0097] (3) The present invention uses the finite element method to accurately predict the crash resistance behavior of the composite beverage can, and provides an effective modeling and analysis method for anti-collision devices that use the composite beverage can as an internal energy consumption unit. This can provide a basis for guiding the finite element method for the development, design and optimization of corresponding anti-collision devices.

[0098] In this embodiment, perlite is used as the filler 4 for modeling, but in actual operation, ceramsite, EPS foam particles, waste rubber particles and polyurethane foam can also be used as the filler 4 for modeling.

[0099] Example 3

[0100] An energy-consuming unit, which can be used in a method for predicting collision resistance behavior of an energy-consuming unit in Example 1 or Example 2, comprises a tank body and a filling member 4, wherein the filling member 4 is arranged inside the tank body, wherein one end of the tank body is an impacted surface and the other end is a supported surface, and the filling member 4 is a plurality of lightweight granular components.

[0101] In this embodiment, the filler 4 is made of perlite, and the tank body is made of scrap metal tank body, which has the advantages of low carbon economy, excellent collision resistance and easy manufacturing.

[0102] However, in actual use, the lightweight granular components can also be replaced with: expanded clay, EPS foam particles, waste rubber particles and polyurethane foam, or mixed components of the above materials.

[0103] The filling rate of the filling member 4 is determined according to the usage scenario of the energy consumption unit and the material of the lightweight granular component.

[0104] The use scenarios of this energy dissipation unit include: ship collision prevention devices outside bridge piers, explosion-proof walls, car collision prevention devices outside current multi-story parking lots, buffer devices to prevent elevators from falling in elevator shafts, and anti-vehicle over-height collision devices in front of bridge beams and on height-limiting poles. In these use scenarios, both ends of the tank body bear the impact.

[0105] Example 4

[0106] A computer device, characterized in that it includes at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for predicting the collision resistance behavior of an energy-consuming unit as described in Example 2.

[0107] Example 5

[0108] A computer-readable medium stores instructions executable by a processor, and when the instructions are executed by the processor, the processor executes a method for predicting the crashworthiness behavior of an energy-consuming unit as described in Example 2.

[0109] Information can be stored using any combination of one or more computer-readable media. These media are divided into two types: computer-readable signal media and computer-readable storage media. Computer-readable storage media include, but are not limited to, the following forms: it can be electronic, magnetic, optical, electromagnetic, infrared technology or semiconductor systems, devices or devices, or any combination of the above technologies. Specifically, examples of computer-readable storage media include, but are not limited to: electrical connections (including one or more wires), portable computer disks, hard drives, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable CD-ROMs, optical storage devices, and magnetic storage devices, etc., or a combination of any one or more of the above technologies.

[0110] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for predicting crashworthiness behavior of an energy-consuming unit, characterized in that: The following steps are included: S1. Establishing a finite element model of the tank body before filling and a finite element model of the tank body after filling in the modeling system, wherein the finite element model of the tank body before filling includes the finite element model of the empty tank body, and the finite element model of the tank body after filling includes the finite element model of the empty tank body and the finite element model of the filling part, wherein the finite element model of the filling part is arranged inside the finite element model of the empty tank body, and the finite element model of the filling part is a lightweight particle model, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body before filling, and an impact force and a supporting force are respectively applied along the axis of the finite element model of the empty tank body at both ends of the finite element model of the tank body after filling; S2. Assigning calculation parameters of the empty tank finite element model and the filling part finite element model respectively in the modeling system, and determining the solution time according to the compression displacement of the filled tank finite element model; S3. Solve the calculation in the modeling system to obtain the predicted deformation behavior-Ⅰ and predicted force-displacement response curve-Ⅰ of the tank finite element model before filling, and the predicted deformation behavior-Ⅱ and predicted force-displacement response curve-Ⅱ of the tank finite element model after filling, and complete the prediction of the crashworthiness behavior of the energy-consuming unit.

2. The method for predicting crashworthiness behavior of an energy consumption unit according to claim 1, characterized in that: Before step S1, the engineering stress-strain curve of the tank to be tested is obtained by stretching the standard tensile piece of the tank to be tested in the actual test, the engineering stress-strain curve of the tank to be tested is converted into a true stress-strain curve and then the elastic strain of the tank to be tested is subtracted to obtain the effective stress-strain curve of the tank to be tested, and the finite element model of the empty tank is established through the effective stress-strain curve of the tank to be tested.

3. The method for predicting crashworthiness behavior of an energy consumption unit according to claim 2, characterized in that: The effective stress-strain curve of the tank body to be tested includes a first effective stress-strain curve and a second effective stress-strain curve. The first effective stress-strain curve is applicable to the tank body to be tested before necking, and the second effective stress-strain curve is applicable to the tank body to be tested after necking.

4. A method for predicting crashworthiness behavior of an energy consumption unit according to any one of claims 1 to 3, characterized in that: In step S1, a tank body 3D model and a filler 3D model are first established in the modeling system according to the actual size of the tank body to be tested, and then the tank body 3D model is meshed in the form of 2D units, and the filler 3D model is meshed in the form of 3D hexahedral units; the mesh size of the tank body 3D model is 5-10 times the wall thickness of the tank body to be tested; the mesh of the filler 3D model is symmetrical along the axis of the tank body 3D model.

5. A method for predicting crashworthiness behavior of an energy consumption unit according to any one of claims 1 to 3, characterized in that: The calculation parameters in step S2 include: unit types, material models and material parameters of the empty tank body finite element model, the filling piece finite element model, the fixed plate finite element model and the movable plate finite element model. The fixed plate finite element model is used to apply supporting force, and the movable plate finite element model is used to apply impact force.

6. A method for predicting crashworthiness behavior of an energy consumption unit according to any one of claims 1 to 3, characterized in that: Step S2 further includes: defining contact relationships between the empty tank finite element model and the fixed plate finite element model and the movable plate finite element model, wherein the fixed plate finite element model is used to apply a supporting force and the movable plate finite element model is used to apply an impact force; defining a contact relationship between two adjacent grids inside the empty tank finite element model; Define the contact relationship between the two adjacent meshes of the empty tank finite element model and the filler finite element model, and define the contact relationship between the two adjacent meshes inside the filler finite element model.

7. A method for predicting crashworthiness behavior of an energy consumption unit according to any one of claims 1 to 3, characterized in that: Before step S1, a compression sample of the filling piece to be tested is compressed to obtain a stress-strain curve of the filling piece to be tested, the elastic modulus of the filling piece to be tested is obtained by fitting the stress-strain curve of the compression sample of the filling piece to be tested, and then a finite element model of the filling piece is established according to the elastic modulus of the filling piece to be tested.

8. An energy consumption unit, characterized in that: It comprises a tank body and a filling piece (4), wherein the filling piece (4) is used to be arranged inside the tank body, one end of the tank body is an impacted surface, and the other end is a supported surface, and the filling piece (4) is a plurality of light granular components.

9. A computer device, characterized in that: It includes at least one processor and a memory that is communicatively connected to the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for predicting the collision resistance behavior of an energy-consuming unit as described in any one of claims 1-8.

10. A computer-readable medium storing instructions executable by a processor, wherein when the instructions are executed by the processor, the processor executes the method for predicting the crashworthiness behavior of an energy consumption unit according to any one of claims 1 to 8.

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