CN111581863B - Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision - Google Patents
Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision Download PDFInfo
- Publication number
- CN111581863B CN111581863B CN202010356823.3A CN202010356823A CN111581863B CN 111581863 B CN111581863 B CN 111581863B CN 202010356823 A CN202010356823 A CN 202010356823A CN 111581863 B CN111581863 B CN 111581863B
- Authority
- CN
- China
- Prior art keywords
- plastic
- plastic buckle
- buckle
- vehicle
- collision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Optimization (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Automation & Control Theory (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of vehicle virtual performance testing, in particular to a simulation method for predicting shedding of front and rear bumpers of a vehicle in plastic buckle collision, which comprises the following steps: s1, constructing a structural local simplified finite element model of the plastic buckle by adopting a simplified modeling method that a shell unit is matched with a spring beam unit for a main clamping end and a secondary clamping interface of the plastic buckle; s2, acquiring failure load parameters of the plastic buckle by relying on a pull-off static mechanical property test of the plastic buckle, and embodying the failure load parameters in a failure material card of the spring beam unit; and S3, predicting the condition that the plastic buckle of the front and rear bumpers of the vehicle falls off in the collision according to the simulation of the simplified plastic buckle finite element model. The invention aims to predict the falling risk of plastic buckles of front and rear bumpers in low-speed collision.
Description
Technical Field
The invention relates to the technical field of vehicle virtual performance testing, in particular to a simulation method for predicting shedding of front and rear bumpers of a vehicle in plastic buckle collision.
Background
As the most important factor of the current vehicle type pricing, a test evaluation system of the Chinese insurance automobile safety index (C-IASI) needs to perform test evaluation of four indexes of crashworthiness, maintenance economy, safety of passengers in a vehicle, safety of pedestrians outside the vehicle and auxiliary safety of the vehicle around vehicle damage and human injury in an automobile insurance accident from the standpoint of consumers and from the perspective of automobile insurance.
The crashworthiness and the maintenance economy index are used as a subentry rule of a safety index C-IASI test evaluation system and aim to evaluate the crashworthiness and the maintenance economy of the vehicle in low-speed frontal collision and low-speed rear-end collision. Crashworthiness refers to the ability of a vehicle to withstand the forces of a collision, the ability of the vehicle to control physical displacement, deformation during and during the absorption of collision energy, and the ability to protect structures and high value parts from damage. Repair economy refers to serviceability in terms of physical conditions and cost. The good maintenance economy means that the accident vehicle can be repaired most economically or parts replaced so as to be restored to the state before the accident.
To evaluate the crashworthiness and maintenance economy of a vehicle in a low-speed frontal collision and a low-speed rear-end collision, the C-IASI protocol includes two tests, one in which the test vehicle impacts the rigid barrier at 15km/h in a low-speed structural frontal collision of the vehicle. And secondly, in the rear-end collision of the low-speed structure of the vehicle, the mobile trolley provided with the rigid barrier impacts the rear part of the static test vehicle at the speed of 15 km/h.
Although the impact energy of the front-rear 15km/h low-speed collision is lower than that of the high-speed collision, the front bumper and the rear bumper are used as first collision contact points, so that the whole structure of the bumper is deformed and damaged easily. The internal parts of the bumper assembly are generally connected with each other through plastic buckles, and the plastic buckles serving as indispensable connecting pieces are also easily deformed and damaged in collision, so that economic loss is caused. In maintenance economy, it is generally necessary to determine whether a part needs to be repaired or replaced, based on the degree of deformation of the part. The plastic buckle is used as a common connection mode in the bumper, so that the falling risk evaluation of the plastic buckle is a very important ring for the maintenance economy test index evaluation. In addition, the mold opening period of the larger plastic part of the bumper is longer, so that the risk of falling off of the similar plastic buckle connection needs to be evaluated and optimized in advance in the development stage, and references and suggestions are provided for the plastic buckle arrangement and the structural design of the front and rear bumpers.
The existing CAE simulation modeling means can well predict various mechanical behaviors of isotropic metal plates, but the mechanical behaviors of anisotropic plastic parts such as front and rear bumpers and the like are difficult to accurately simulate. In addition, the number of shell units of the whole vehicle collision model is in the millions, the calculation time and the calculation efficiency cost are considered, and certain requirements are imposed on the minimum unit partition size. However, because the relevant structure size of the plastic buckle in the front and rear bumpers is small, the mechanical characteristics of the plastic buckle are researched by the traditional modeling method, a smaller grid size is often needed to express the tiny characteristics of the buckle, and the whole vehicle model has longer calculation time and cannot meet the development iteration cycle. Therefore, the automobile model built by the conventional shell unit is difficult to represent the mechanical characteristics of the plastic buckle in the process of front and rear low-speed collision. The falling of plastic buckles of the front and rear bumpers during low-speed collision cannot be predicted, so that risk assessment is carried out.
Disclosure of Invention
The invention mainly aims to provide a simulation method for predicting falling-off of a plastic buckle of a front bumper and a rear bumper of a vehicle in collision, and aims to predict the falling-off risk of the plastic buckle of the front bumper and the rear bumper in low-speed collision.
In order to achieve the aim, the invention provides a simulation method for predicting the falling of plastic buckles of front and rear bumpers of a vehicle in collision, which comprises the following steps:
s1, constructing a structural local simplified finite element model of the plastic buckle by adopting a simplified modeling method that a shell unit is matched with a spring beam unit for a main clamping end and a secondary clamping interface of the plastic buckle;
the construction of the structure local simplified finite element model specifically comprises the following three steps:
s101, virtualizing a main card connecting end and a slave card interface which are formed by the simplified plastic card; the main clamping end comprises a clamping piece body and a clamping pin;
s102, constructing simplified main card connecting ends and simplified auxiliary card interfaces through shell units, and endowing real material thickness and real contact thickness to contact parts of the main card connecting ends and the auxiliary card interfaces to form a card piece body model, a card pin model and a card interface model;
s103, connecting two ends of the spring beam unit with the clamping piece Body model and the clamping pin model, wherein a node at one end of the spring beam unit is connected with a node of a shell unit in the middle of a grid in the clamping piece Body model, and a node at the other end of the spring beam unit is connected with a connecting node arranged on the clamping pin model through a connected Nodal region thickened Body;
s2, acquiring failure load parameters of the plastic buckle by relying on a pull-out mechanical property test of the plastic static buckle, and reflecting the failure load parameters in a failure material card of the spring beam unit;
and S3, predicting the condition that the plastic buckle of the front and rear bumpers of the vehicle falls off in the collision according to the simulation of the simplified plastic buckle finite element model.
The working principle and the advantages of the invention are as follows:
1. the local finite element model's of simplifying of structure construction can simplify the setting through limited quantity's shell unit and spring beam unit with the model of plastics buckle, need not remove to divide the less grid size of dividing in order to study the mechanical properties of plastics buckle for the model of plastics buckle constructs more conveniently, thereby very big reduction work load, has reduced calculation time, satisfies development iteration cycle.
2. By means of a static plastic buckle pull-out mechanical property test, failure load parameters of a real plastic buckle can be conveniently obtained, and then the failure load parameters are led into failure material cards of spring beam units of a structure local simplified finite element model, so that a clamping end and a clamping interface are not simple models any more, but simulation models of real mechanical behaviors can be simulated, and the problem that the mechanical behaviors of anisotropic plastic parts are difficult to accurately simulate by the existing CAE simulation modeling means is solved. And according to the finite element model which is locally simplified in the structure and the data of the material mechanical property test, the falling condition of the vehicle using the plastic buckle in different vehicle bumpers in real collision can be predicted.
The structure is locally simplified, and the finite element model is arranged in such a way that the mesh division size of the shell unit of the plastic buckle related structure of the front and rear bumpers is reserved as the original mesh division size without improvement. Because the research significance of the appearance of the model on the transmission effect of the contact force is small, the setting of the real material thickness and the real contact thickness of the contact part of the main clamping end and the auxiliary clamping interface is only given, the simplified setting of the model can be facilitated, and the research on the transmission effect of the real contact force between the main clamping pin and the auxiliary clamping interface through the model is not influenced. When the main clamping pin is in effective contact with the auxiliary clamping interface under the impact of external load, the contact force is transmitted to the spring beam unit which is used for connecting the main clamping pin and the clamping piece body model. The mechanical property of the plastic buckle falling off is characterized by the transmission of contact force and the spring beam unit, so that the mechanical property of the plastic buckle in the front and back low-speed collision process can be conveniently researched.
Further, in step S2, the test of the static pull-off mechanical property of the plastic buckle specifically includes the following steps:
s201, classifying the plastic buckles with different structural shapes;
s202, carrying out static pull-out mechanical property tests on different types of plastic buckles under different temperature conditions;
and S203, recording experimental test data, and drawing a test experiment table, wherein the experimental test data comprises a load displacement curve, a peak load size and buckle failure displacement.
By obtaining the simulation data of falling of various plastic buckles in collision, the situation that the plastic buckles fall off in collision can be predicted when the plastic buckles are selected for the front and rear bumpers of the vehicle, so that the proper plastic buckles are selected, the die opening die of the bumper is determined, and the situation that the bumper with a long die opening period needs to be opened repeatedly is avoided.
Even though the pull-off forces are different, the failure load parameters of the same plastic snap design are similar because of the inherent properties of the plastic snap itself. The peak load of the failure load is higher or lower under the influence of other factors, but the difference is not too large, and the rule can be found.
Further, the pull-off mechanical property test adopts quasi-static stretching.
Since the test vehicle hit the rigid barrier at 15km/h, the speed was slow and can be approximated as a static pull. The experiment can be carried out simply and conveniently, and proper experimental data can be collected.
Further, the temperature conditions are based on ambient temperature, including low, normal, and high temperatures.
Because the influence of the environmental temperature on the mechanical property of the plastic material is more sensitive than that of the metal material, the influence of the environmental temperature needs to be considered for researching the pull-off characteristic of the plastic buckle. The low temperature, the normal temperature and the high temperature are set, so that the temperature of all seasons can be simulated conveniently, and the experimental error is reduced.
Further, the step S2 includes the following steps:
s204, acquiring all peak load data of the plastic buckles at a specific temperature from the test and experiment table;
s205, performing classification statistical calculation on all peak load data according to a preset rule, and taking a calculation result of the classification statistical calculation as a failure load parameter of the plastic buckle;
and S206, endowing the failure load parameters into the failure material card of the spring beam unit.
Under the same temperature environment, even if the pulling-out force is different, the failure load parameters are approximate, and only the magnitude of the peak load of the failure load is high or low under the influence of other factors, so that the failure load parameters are inconvenient to select. And through the classification statistical calculation, the failure interval corresponding to the failure load of the real plastic buckle can be conveniently found, so that the proper peak load can be conveniently selected as the failure load parameter to be given to the failure material card of the spring beam unit.
Further, the rule is: and performing descending order arrangement on all peak load data according to the magnitude of the numerical values to obtain a peak load ordered list, dividing the peak load data in the peak load ordered list into a plurality of groups, and calculating the average value of the peak loads in the same group.
The failure interval of the real plastic buckle failure load at a certain temperature can be conveniently obtained through a statistical calculation mode, and therefore subsequent experimental simulation prediction is facilitated.
Further, the number of groups grouped is 3 or more.
If the number of the grouped groups is 2, only one maximum value and one minimum value can be obtained, the limit value of the failure load of the plastic buckle at the same temperature is obtained, and the limit value is used as the failure load parameter, so that the error in subsequent experimental simulation prediction is easy to cause. If the number of the grouped groups is more than or equal to 3, an intermediate value can be conveniently determined between the maximum value and the minimum value of the peak load, the error of the intermediate value is smaller than that of the limit value in subsequent experimental simulation prediction, and the more the groups are divided, the larger adjustment interval can be provided for the value selected by the peak load, so that the error can be conveniently reduced in the subsequent experimental simulation prediction.
Drawings
FIG. 1 is a flow chart of an embodiment of a simulation method of the present invention for predicting dropout in a plastic buckle crash of a front and rear bumper of a vehicle;
FIG. 2 is a simplified schematic diagram of a structurally partial simplified finite element model;
FIG. 3 is an analysis diagram of a failure mode stage one of a partially simplified finite element model of a structure;
FIG. 4 is an analysis diagram of failure mode stage two of the structurally localized simplified finite element model;
FIG. 5 is an analysis diagram of failure mode stage three of the structurally localized simplified finite element model;
FIG. 6 is a schematic view of a spent material card;
fig. 7 is a schematic view of a load displacement curve.
Detailed Description
The following is further detailed by way of specific embodiments:
examples
A simulation method for predicting shedding of plastic buckles of front and rear bumpers of a vehicle in collision comprises the following steps, wherein the steps are basically as shown in the attached figure 1:
s1, constructing a structural local simplified finite element model of the plastic buckle by adopting a simplified modeling method that a shell unit is matched with a spring beam unit for a main clamping end and a secondary clamping interface of the plastic buckle; and constructing a local simplified finite element model for representing the real plastic buckle.
The construction of the structure local simplified finite element model specifically comprises the following three steps:
s101, virtualizing a main card connecting end and a slave card interface which are formed by the simplified plastic card; the main clamping end comprises a clamping piece body and a clamping pin;
s102, constructing simplified main card connecting ends and simplified auxiliary card interfaces through shell units, and endowing real material thickness and real contact thickness to contact parts of the main card connecting ends and the auxiliary card interfaces to form a card piece body model, a card pin model and a card interface model;
s103, connecting two ends of the spring beam unit with the clamping piece Body model and the clamping pin model, wherein a node at one end of the spring beam unit is connected with a node of a shell unit in the middle of a grid in the clamping piece Body model, and a node at the other end of the spring beam unit is connected with a connecting node arranged on the clamping pin model through a connected Nodal region thickened Body.
S2, acquiring failure load parameters of the plastic buckle by relying on a static plastic buckle pull-out mechanical property test, and embodying the failure load parameters in a material card of the spring beam unit; and the pulling-out mechanical property test adopts quasi-static stretching.
The static plastic buckle pull-out mechanical property test specifically comprises the following six steps:
s201, classifying the plastic buckles with different structural shapes;
s202, carrying out static pull-out mechanical property tests on different types of plastic buckles under different temperature conditions; the temperature conditions are based on ambient temperature, including low, normal and high temperatures.
And S203, recording experimental test data, and drawing a test experiment table, wherein the experimental test data comprises a load displacement curve, a peak load size and buckle failure displacement. The load displacement curve represents a curve of the load (pull-off force) along with the change of time, and the peak load is the pull-off load corresponding to different peaks on the load displacement curve. The buckle failure displacement represents the distance the buckle moves after the buckle is pulled out to fail (damaged).
S204, acquiring all peak load data of the plastic buckle at a specific temperature (low temperature, normal temperature or high temperature) from the test experiment table;
s205, performing classification statistical calculation on all peak load data according to a preset rule, wherein the rule is as follows: and performing descending order arrangement on the peak loads of all the load displacement curves according to the magnitude of the numerical values to obtain a peak load ordered list, dividing the peak load data in the peak load ordered list into a plurality of groups, and calculating the average value of the peak loads in the same group. The number of groups to be grouped is greater than or equal to 3 groups, in this embodiment, the number of groups to be grouped is 3 groups, and the peak loads of the 3 groups are sequentially arranged in descending order as a high limit value, a medium limit value and a low limit value after calculation. The upper limit value represents the maximum load that the plastic buckle can carry, the middle limit value represents the middle value between the maximum load and the minimum load that the plastic buckle can carry, and the lower limit value represents the minimum load that the plastic buckle can carry. And selecting one from the high limit value, the middle limit value and the low limit value as a failure load parameter of the plastic buckle. The middle limit value is free between the upper limit value and the lower limit value, and can be amplified by times on the basis of the lower limit value or reduced by times on the basis of the upper limit value.
And S206, endowing the failure load parameters into the failure material card of the spring beam unit. After the spring beam unit is endowed with failure load parameters, the contact mechanical property between the clamping piece body and the clamping pin in the real plastic clamping buckle can be represented. The virtual attributes are visualized through a visual model.
S3, simulating the failure characteristic of the plastic buckle according to the simplified plastic buckle finite element model and the failure material card, and simulating and predicting the actual falling-off condition of the same plastic buckle in low-speed collision in the front bumper and the rear bumper of the vehicle according to the failure characteristic of the plastic buckle.
The specific implementation process is as follows:
the commonly used plastic material brands in the automobile field are as follows: PA6, PA6+ GFxx, PA66, PA66+ GFxx, Pom, PP + EPDM, PC + ABS and the like, firstly, different clamping types such as a buckle type 1, a buckle type 2 and the like are classified according to the clamping structure of different plastic buckles of the front and rear bumpers of the vehicle.
The influence of the environmental temperature on the mechanical property of the plastic material is more sensitive than that of the metal material, such as expansion with heat and contraction with cold, softening by melting at high temperature and the like. Although the test temperature of the low-speed collision test before and after is not specified in the safety index crashworthiness and maintenance economy index test regulations, the influence of the environmental temperature on the plastic buckle in the whole year is fully considered for fully researching the pull-out characteristic of the plastic buckle due to the rigor of the test. The test site is Beijing, the Beijing is 0 ℃ in winter and 23 ℃ in summer, the extremely individual high temperature may appear about 40 ℃, which may cause the mechanical property result of the bumper plastic to be different along with the temperature change, and the high temperature test temperature is defined as 40 ℃, the normal temperature is 23 ℃, and the low temperature is 0 ℃.
And (3) carrying out a buckle pull-out test for 15 times in each temperature environment, recording a load displacement curve, and drawing a test experiment table as follows because the speed of front and rear low-speed collision is 15km/h and the pull-out test adopts quasi-static stretching:
the maximum load (peak load) of the pull-off force obtained in the test was recorded in the table.
According to the steps S204, S205 and S206, obtaining all peak load data of the plastic buckles at the same temperature from the test experiment table; full peak load data F of e.g. buckle type 31、F2……F15. F is to be1、F2……F15The values were sorted in descending order according to their size and were divided into 3 groups. As shown in fig. 7, the first 5 load-displacement curves in which the peak loads are arranged in descending order are shown, and the peak loads of the 5 load-displacement curves are set as a set of data. Calculating the peak value in the same groupThe average value of the loads, and the peak loads of the 3 groups are sequentially arranged into a high limit value, a middle limit value and a low limit value in descending order after calculation. And selecting one from the high limit value, the middle limit value and the low limit value as a failure load parameter of the plastic buckle, and endowing the failure load parameter to a failure material card of the spring beam unit. Wherein the peak loads are selected to be different and the failure material cards finally constructed are also different. Generally, the failure load parameter corresponding to the middle limit value can be close to the parameter of a real buckle pull-off test, but the optimal middle limit value can be obtained by continuously adjusting the middle limit value and comparing the real buckle pull-off test with the middle limit value, so that the optimal failure load parameter can be obtained.
The specific explanation for the failure load parameters and failure material cards is as follows: acquiring failure load parameters of a specific type of plastic buckle at a specific temperature by relying on a plastic buckle pull-off static mechanical property test, wherein the failure load parameters mainly comprise peak load (any one of a high limit value, a middle limit value and a low limit value) and maximum buckle failure displacement of buckle failure, describing the failure characteristics by adopting MAT 196 GENERAL SPRING DICRETE BEAM material, and constructing a failure material card. As shown in fig. 6, the table of the failure material cards amounts to 12 rows, 2 rows being one group, and 6 groups being recordable. In the first set of tables, DOF _1 indicates the degree of freedom of the spring beam unit in the axial direction, for example, if DOF _1 is set to 1, it indicates that the arrangement direction of the spring beam unit is the direction indicated by degree of freedom 1. MID represents material name identification and RO represents material density.
TYPE _1 input 0 indicates that plastic snap pull-off failure is a nonlinear elastic mechanical behavior. And filling the maximum failure displacement of the buckle obtained by the test into the TDF _1, and further calibrating a stiffness curve FLCID _1 of the spring beam unit to describe the nonlinear elastic behavior in the failure process according to the peak load and the maximum failure displacement of the buckle failure, wherein the number in the FLCID _1 represents the number of the stiffness curve of the spring. In this embodiment, the parameter settings such as K _1_ D _1, CDF _1, HLCID _1, C1_1, C2_1, DLE _1, and GLCID _1 may be omitted, and thus are not described in detail.
Then, simplified modeling of all types of plastic buckles is carried out according to the steps from S101 to S104, and after simplification, as shown in FIG. 2, 3 parts are provided in total, namely a buckle piece body model A, a buckle interface model B and a buckle pin model C; the clamping piece body model A, the clamping interface model B and the clamping pin model C are formed by combining a plurality of shell units, and the structure is simple and convenient to design. In reality, joint spare body and joint round pin are integrated into one piece, just can realize the fixed of joint spare body after the joint round pin gets into the joint interface, under the condition of collision, joint spare body and joint round pin can separate. And in the modeling, if the shell units of the clamping piece body model A and the clamping pin model C share a common point, the clamping piece body model A and the clamping pin model C can not be separated under the action of external force. Therefore, the card body model A, the card interface model B and the card pin model C are all not in common node with each other.
The clamping piece body model A and the clamping pin model C are connected through a spring beam unit D, mechanical performance parameters (failure load parameters) of the plastic buckle are reflected in the material and the attribute of the spring beam unit, the maximum pull-off load is given to the spring beam unit D through relevant data of a test experiment table, and the maximum pull-off load is used as the parameter of the spring beam unit D to simulate the mechanical behavior between the clamping piece body model A and the clamping pin model C. Spring beam unit D one end node links firmly joint spare body model A, and the other end links firmly with joint round pin model C, and joint round pin model C uses elastic material to be responsible for and joint interface model B contact, need notice spring beam unit D axis be located in the middle of joint spare body model A, can regard like this that the joint round pin drops because along the too big arouse of axial load, the process definition that the joint round pin drops is failure mode, including compression failure mode and extension failure mode. The compression failure mode and the elongation failure mode are the same in principle, the compression failure mode is not considered in the embodiment, and the specific failure mode of the elongation failure mode is shown in fig. 3, 4 and 5.
The failure mode is described below;
stage one: as shown in fig. 3, axial load along the joint part body model a makes the joint part body model a drive the joint round pin model C of the above to remove from the joint interface model B direction, and the spring beam unit D keeps original length this moment, does not have the contact force between joint round pin model C and the joint interface model B.
And a second stage: as shown in fig. 4, the displacement continues to increase until the card pin model C and the card interface model B contact each other, the spring beam unit D starts to extend, and the contact force between the card pin model C and the card interface model B starts to increase linearly.
And a third stage: as shown in fig. 5, the load of the spring beam unit D reaches a peak, and the spring beam unit D continues to elongate until the elongation displacement limit is reached and fails.
Finally, according to the established structure local simplified finite element model and the failure characteristics of the plastic buckle obtained through simulation, the falling-off condition of the vehicle using the plastic buckle in different vehicle bumpers in real collision can be predicted.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. A simulation method for predicting shedding of plastic buckles of front and rear bumpers of a vehicle in collision is characterized by comprising the following steps of:
s1, constructing a structural local simplified finite element model of the plastic buckle by adopting a simplified modeling method that a shell unit is matched with a spring beam unit for a main clamping end and a secondary clamping interface of the plastic buckle;
the construction of the structure local simplified finite element model specifically comprises the following three steps:
s101, virtualizing a main card connecting end and a slave card interface which are formed by the simplified plastic card; the main clamping end comprises a clamping piece body and a clamping pin;
s102, constructing simplified main card connecting ends and simplified auxiliary card interfaces through shell units, and endowing real material thickness and real contact thickness to contact parts of the main card connecting ends and the auxiliary card interfaces to form a card piece body model, a card pin model and a card interface model;
s103, connecting two ends of the spring beam unit with the clamping piece Body model and the clamping pin model, wherein a node at one end of the spring beam unit is connected with a node of a shell unit in the middle of a grid in the clamping piece Body model, and a node at the other end of the spring beam unit is connected with a connecting node arranged on the clamping pin model through a connecting unit constrained Nodal region Body;
s2, acquiring failure load parameters of the plastic buckle by relying on a pull-out mechanical property test of the plastic static buckle, and reflecting the failure load parameters in a failure material card of the spring beam unit;
and S3, predicting the condition that the plastic buckle of the front and rear bumpers of the vehicle falls off in the collision according to the simulation of the simplified plastic buckle finite element model.
2. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 1, wherein: in the step S2, the test of the static pull-off mechanical property of the plastic buckle specifically includes the following steps:
s201, classifying the plastic buckles with different structural shapes;
s202, carrying out static pull-out mechanical property tests on different types of plastic buckles under different temperature conditions;
and S203, recording experimental test data, and drawing a test experiment table, wherein the experimental test data comprises a load displacement curve, a peak load size and a buckle failure displacement.
3. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 1, wherein: the pulling-out mechanical property test adopts quasi-static stretching.
4. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 2, wherein: the temperature conditions are based on ambient temperature, including low, normal and high temperatures.
5. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 4, wherein: in step S2, the method further includes:
s204, acquiring all peak load data of the plastic buckle at a specific temperature from the test experiment table;
s205, performing classification statistical calculation on all peak load data according to a preset rule, and taking a calculation result of the classification statistical calculation as a failure load parameter of the plastic buckle;
and S206, endowing the failure load parameters into the failure material card of the spring beam unit.
6. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 5, wherein: the rule is as follows: and performing descending order arrangement on all peak load data according to the magnitude of the numerical values to obtain a peak load ordered list, dividing the peak load data in the peak load ordered list into a plurality of groups, and calculating the average value of the peak loads in the same group.
7. The simulation method for predicting the shedding of the plastic buckle collision of the front and rear bumpers of the vehicle as claimed in claim 6, wherein: the number of groups is 3 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356823.3A CN111581863B (en) | 2020-04-29 | 2020-04-29 | Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356823.3A CN111581863B (en) | 2020-04-29 | 2020-04-29 | Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111581863A CN111581863A (en) | 2020-08-25 |
| CN111581863B true CN111581863B (en) | 2022-05-06 |
Family
ID=72111835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010356823.3A Active CN111581863B (en) | 2020-04-29 | 2020-04-29 | Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111581863B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611554B (en) * | 2020-11-30 | 2023-09-26 | 中国汽车工程研究院股份有限公司 | Virtual simulation method for predicting falling off of ball hinge under impact working condition |
| CN112765788B (en) * | 2020-12-31 | 2023-02-21 | 成都航天模塑股份有限公司 | Plastic part collision fracture simulation analysis method and automobile instrument panel assembly structure optimization method |
| CN113033040B (en) * | 2021-03-05 | 2023-02-21 | 一汽奔腾轿车有限公司 | Accurate modeling method for vehicle flexible connection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5562390A (en) * | 1995-01-24 | 1996-10-08 | Mcneilus Truck And Manufacturing, Inc. | Detachable truck body and handling mechanism |
| CN102809660A (en) * | 2012-08-22 | 2012-12-05 | 合肥工业大学 | Method and equipment for detecting fatigue damage during automobile axle housing reproduction |
| CN105760592A (en) * | 2016-02-05 | 2016-07-13 | 吉林大学 | Method for modeling non-linear connecting characteristic of vehicle bumper plastic fastener |
| CN108501844A (en) * | 2018-06-08 | 2018-09-07 | 吉林大学 | A kind of collision prevention girders buffer structure with rigidity compensation function |
| CN110108400A (en) * | 2019-06-04 | 2019-08-09 | 福建省威盛机械发展有限公司 | Stress real-time monitoring system and its control method applied to forklift truck body structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7832762B2 (en) * | 1995-06-07 | 2010-11-16 | Automotive Technologies International, Inc. | Vehicular bus including crash sensor or occupant protection system control module |
| US20020065613A1 (en) * | 2000-09-21 | 2002-05-30 | Woods Joseph Thomas | System, method and storage medium for predicting impact performance of painted thermoplastic |
-
2020
- 2020-04-29 CN CN202010356823.3A patent/CN111581863B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5562390A (en) * | 1995-01-24 | 1996-10-08 | Mcneilus Truck And Manufacturing, Inc. | Detachable truck body and handling mechanism |
| CN102809660A (en) * | 2012-08-22 | 2012-12-05 | 合肥工业大学 | Method and equipment for detecting fatigue damage during automobile axle housing reproduction |
| CN105760592A (en) * | 2016-02-05 | 2016-07-13 | 吉林大学 | Method for modeling non-linear connecting characteristic of vehicle bumper plastic fastener |
| CN108501844A (en) * | 2018-06-08 | 2018-09-07 | 吉林大学 | A kind of collision prevention girders buffer structure with rigidity compensation function |
| CN110108400A (en) * | 2019-06-04 | 2019-08-09 | 福建省威盛机械发展有限公司 | Stress real-time monitoring system and its control method applied to forklift truck body structure |
Non-Patent Citations (3)
| Title |
|---|
| Impact Analysis on Car Bumper by varying speeds using Materials ABS Plastic and Poly Ether Imide by Finite Element Analysis software Solid works;Pradeep Kumar Uddandapu;《International Journal of Modern Engineering Research》;20130228;第3卷(第1期);391-395页 * |
| 某乘用车前保险杠刚度及回弹特性的非线性有限元分析;周长宽;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20180115;C035-115 * |
| 某乘用车后保险杠有限元仿真与试验研究;李瑞强;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20180115;C035-117 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111581863A (en) | 2020-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111581863B (en) | Simulation method for predicting falling-off of plastic buckles of front and rear bumpers of vehicle in collision | |
| Wang et al. | Structure design and multi-objective optimization of a novel NPR bumper system | |
| Wang et al. | Finite element simulation of PMMA aircraft windshield against bird strike by using a rate and temperature dependent nonlinear viscoelastic constitutive model | |
| Mohammed et al. | Pedestrian collision responses using legform impactor subsystem and full-sized pedestrian model on different workbenches | |
| Tanlak et al. | Shape optimization of bumper beams under high-velocity impact loads | |
| Masoumi et al. | Comparison of steel, aluminum and composite bonnet in terms of pedestrian head impact | |
| CN107256289A (en) | The method for building up of car crass reduced parameter FEM model | |
| Pawlus et al. | Application of viscoelastic hybrid models to vehicle crash simulation | |
| Deng et al. | Finite element analysis of occupant head injuries: Parametric effects of the side curtain airbag deployment interaction with a dummy head in a side impact crash | |
| CN102201016B (en) | Method for modeling and simulating door lock system based on vehicle crash safety | |
| Wang et al. | Structure-material-performance integration lightweight optimisation design for frontal bumper system | |
| Duddeck et al. | A new topology optimization approach for crashworthiness of passenger vehicles based on physically defined equivalent static loads | |
| Lei et al. | Multiobjective discrete optimization using the TOPSIS and entropy method for protection of pedestrian lower extremity | |
| Asadpoori et al. | Parametric study of automotive shape memory alloy bumper beam subjected to low-velocity impacts | |
| Marzougui et al. | Development & validation of a finite element model for a mid-sized passenger sedan | |
| CN114239331A (en) | Equivalent finite element simulation method for high-low temperature pendulum bob of front and rear bumpers of automobiles | |
| Duan et al. | Structural optimization and reliability analysis of automotive composite bumper against low-velocity longitudinal and corner pendulum impacts | |
| Cardoso et al. | Study of the use of metallic foam in a vehicle for an energy‐economy racing circuit | |
| Špirk et al. | Design of a large deformable obstacle for railway crash simulations according to the applicable standard | |
| Valayil et al. | Crash simulation in ANSYS LS-DYNA to explore the crash performance of composite and metallic materials | |
| G Keni et al. | Conceptual design and analysis of a car bumper using finite element method | |
| Valladares et al. | Energy absorbing composite structure for frontal pedestrian protection in electric light vehicles | |
| Supriya et al. | S.: Static, modal and impact analysis of car bumper using varied parameters | |
| SCURTU et al. | Frontal crash simulation of a chassis frame | |
| Sánchez et al. | Development of new deformable barriers for testing vehicle performance in different crash configurations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |