CN103559354A - Simplified analysis method for collision bending of thin-wall curved beam of automotive body - Google Patents
Simplified analysis method for collision bending of thin-wall curved beam of automotive body Download PDFInfo
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Abstract
The invention discloses a method for establishing a simplified model for collision bending of a thin-wall curved beam of an automotive body by adopting a beam element, a nonlinear rotating spring element, a damping element and a column hinge element and belongs to the field of the design for the automotive body. The method is mainly adopted for researching the collision resistance at a conceptual phase for an automobile. According to the method, a bending moment and corner (M(Theta)-Theta) curve is evaluated for the nonlinear rotating spring element during a bending process of the thin-wall curved beam, so as to simulate the rotating features of a plastic hinge of the thin-wall curved beam during the bending process. The damping element and the column hinge element are established at a joint of the nonlinear rotating spring element, so that a correct moving relation of the model during an analysis process is ensured. The simplified analysis method for the collision bending of the thin-wall curved beam of the automotive body provided by the invention can fully meet the requirements for the research on the collision resistance at the conceptual phase for the automobile, the time for calculating a finite element model in the collision analysis of the automobile is greatly shortened and the working efficiency is increased.
Description
Technical field
The invention belongs to Automobile Body Design field, be mainly used in the minibus analysis and research in the automobile concept design stage.Be specifically related to a kind of body of a motor car Thin-walled Curved Beams and collide crooked simplification analytical approach.By setting up the simplified model of Thin-walled Curved Beams, the flexural deformation characteristic of coming express-analysis Thin-walled Curved Beams to show at collision process, instructs the conceptual design of body of a motor car.
Background technology
According to the minibus analysis theories of body of a motor car, thin walled beam bending is one of form of distortion important in vehicle body crash analysis.Thin-walled Curved Beams destroyed area when collision concentrates on relatively narrow region of corner, and forms plastic hinge in this region.Kecman, YuCheng Liu, the people such as Xu Tao have done a large amount of research for regular sections shape thin-walled deflection of beam characteristic, and have provided the computing method of the regular sections thin walled beam plastic hinge moments of flexure such as box, grooved and corner (M (θ)-θ) relation curve.But thin walled beam mostly is irregular section in actual body structure, the computing method of regular sections thin walled beam plastic hinge moment of flexure and corner (M (θ)-θ) relation curve are also inapplicable.
The present invention adopts the method for simulation analysis, can obtain arbitrary section thin walled beam plastic hinge moment of flexure and corner (M (θ)-θ) relation curve, and apply beam element, and non-linear rotation spring unit, the simplified model of vehicle body Thin-walled Curved Beams plastic hinge is set up in damping unit and post hinge unit.Simulate the deformation characteristic of plastic hinge to non-linear rotation spring unit plastic hinge moment of flexure and corner (M (θ)-θ) relation curve assignment, construct the simplified model of vehicle body Thin-walled Curved Beams, similarly for body of a motor car Thin-walled Curved Beams plastic hinge, simplify analytical approach and do not appear in Automobile Body Design field.
Summary of the invention
Key issue to be solved by this invention is to propose a kind of the automobile concept design stage that is applied to, the method for the simplified model while setting up body of a motor car Thin-walled Curved Beams collision bending.The Thin-walled Curved Beams simplified model of setting up by the method, can greatly reduce automobile in collision finite element analysis required computing time, and can be good at meeting the accuracy requirement in the automobile concept design stage, and to body of a motor car, conceptual design provides guidance.
The present invention realizes by following scheme:
The first step, extracts moment of flexure and corner (M (θ)-θ) relation curve: first in catia, set up 3 dimension models; Secondly model is imported in hypermesh and carry out model processing, grid is divided, and imposed load and boundary condition.The moment of flexure of bearing when the bending in order to measure Thin-walled Curved Beams, need set up in Thin-walled Curved Beams corner the cross section of XSectionPlane type; Then model is imported and in LS-dyna, carry out collision simulation simulation; Finally destination file is imported in hypergraph, plastic hinge moment of flexure and corner (M (θ)-θ) relation curve while extracting thin walled beam bending, it is standby that curve need export as DAT formatted file;
Second step, the foundation of simplified model: first adopt elytschko-Schwer resultant beam element to replace the shell unit of detailed model in hypermesh, set up the main body of simplifying Thin-walled Curved Beams model, adjacent beam element end points is around the corner two nodes that volume coordinate is identical; Secondly between two identical nodes of volume coordinate, set up non-linear rotation spring unit, and as loading curve assignment, give non-linear rotation spring using the DAT form moment of flexure obtaining in the first step and corner (M (θ)-θ) relation curve.For the proper exercise relation in analogy model crash analysis process better, at non-linear rotation spring cell node place, set up post hinge unit, with this, retrain between two nodes that adjacent beams unitary space coordinate is identical and can only relatively rotate, can not relatively move; Then at non-linear rotation spring cell node place, set up damping unit, distortion and energy absorption characteristics that simplified model is shown in collision process are more accurate; Finally simplified model is applied to the load identical with detailed model and boundary condition.
The 3rd step, the simplified model that second step is set up imports dyna and calculates, and by the contrast of detailed model and simplified model result curve, by compare energy temporal evolution situation in Thin-walled Curved Beams detailed model and simplified model in hypergraph, plastic hinge 1 and plastic hinge 2 place's corner temporal evolution situations are verified the correctness of simplified model.
Beneficial effect of the present invention is: by this body of a motor car Thin-walled Curved Beams, collide crooked simplification analytical approach, can predict well the flexural deformation characteristic of body of a motor car Thin-walled Curved Beams in collision process.And can apply it in conceptual phase vehicle body simplified model, improve simulation accuracy and the counting yield of conceptual model, the performance of preliminary project is made to assessment more accurately, shorten the design cycle.
Accompanying drawing explanation
Fig. 1 is single hat section dimensional drawing, and in figure, a is solder joint.
Fig. 2 is Fig. 1 illustrated dimension list hat section thin walled beam moment of flexure and corner (M (θ)-θ) relation curve.
Fig. 3 is the detailed finite element model figure of single hat section Thin-walled Curved Beams.
Fig. 4 is Thin-walled Curved Beams simplified model schematic diagram.
Fig. 5 is the contrast deformation pattern directly perceived of Thin-walled Curved Beams detailed model and simplified model.
Fig. 6 is energy temporal evolution comparison diagram in Thin-walled Curved Beams detailed model and simplified model, and in figure, solid line is energy temporal evolution curve in detailed model, and dotted line is can temporal evolution curve in simplified model.
Fig. 7 is the corner temporal evolution comparison diagram at Thin-walled Curved Beams detailed model and simplified model plastic hinge 1 place, and in figure, solid line is detailed model plastic hinge 1 place's angle temporal evolution curve, and dotted line is simplified model plastic hinge 1 place's angle temporal evolution curve.
Fig. 8 is the corner temporal evolution comparison diagram at Thin-walled Curved Beams detailed model and simplified model plastic hinge 2 places, and in figure, solid line is detailed model plastic hinge 2 place's angle temporal evolution curves, and dotted line is simplified model plastic hinge 2 place's angle temporal evolution curves.
(a) and (b) in Fig. 9, (c) are respectively front longitudinal, the A post of certain vehicle, the detailed model figure of B post.
Specific embodiments
Below in conjunction with accompanying drawing the material parameter of take in single hat section parameter shown in Fig. 1 and table 1, the present invention is further introduced as example.Consult the parameter of single hat section shown in Fig. 1 and in catia, set up 3 dimension models, then model is imported in hypermesh and carry out model processing, grid is divided, and adds the pre-treatment work such as solder joint, consults material parameter in table 1, gives material properties.Boundary condition and the load condition of finite element model are consulted shown in Fig. 3 in detail, and model left end retrains entirely, the quality point of the additional 500KG of right-hand member, and quality point is moved along the negative direction of X-axis with the initial velocity of 15m/s.In hypermesh, set up control card, as controlled collision time, load step-length, output parameter, hourglass control, touch controls etc., its collision result and experimental data are matched.At detailed model, form plastic hinge place (place of the plastic hinge is consulted shown in Fig. 5) and set up the XSectionPlane type cross section that moment of flexure is born in measurement plastic hinge place.Hypermesh file is exported as to K file, then submit to LS-dyna to calculate.Result of calculation file is imported in hypergraph, extract moment of flexure time (M (θ)-t) relation curve and corner time (θ-t) relation curve.Then by two Curves compilations, take plastic hinge corner as horizontal ordinate, moment of flexure is that ordinate is drawn out moment of flexure corner M (θ)-θ relation curve XSectionPlane and consulted shown in Fig. 2, for future use.
Table 1
Fig. 4 is Thin-walled Curved Beams simplified model schematic diagram, shown in figure, at node 1 and node 2, node 3 and node 4, between node 5 and node 6, set up respectively in hypermesh elytschko-Schwer resultant beam element, the cross section parameter of beam element is consulted shown in Fig. 1.Node 2 and node 3 positions overlap, and have identical volume coordinate, and node 4 and node 5 positions overlap.At node 2 and node 3, between node 4 and node 5, set up respectively the non-linear rotation spring unit of distance of zero mark degree, the loading curve of non-linear rotation spring unit adopts M (the θ)-θ curve in Fig. 2.In order to make model have correct operational relation, between node 2 and node 3, between node 4 and node 5, set up respectively post hinge unit, make node 2 and node 3, between node 4 and node 5, can only produce the rotation around Z axis, can not produce and relatively move.Meanwhile, for make simplified model in collision process, show distortion and energy absorption characteristics more accurate, between node 2 and node 3, between node 4 and node 5, set up respectively damping unit.
Node 1 place of consulting simplified model shown in Fig. 4 applies full constraint, the quality point of additional 500KG at node 6 places, and quality point is moved along X-axis negative direction with the initial velocity of 15m/s.
In hypermesh, set up control card, as controlled collision time, load step-length, output parameter, hourglass control, touch controls etc., make its deformation and detailed finite element model similar.
Application LS-DYNA calculates detailed finite element model and simplified model respectively, and be 10ms computing time.Detailed finite element model and simplification finite element model destination file are opened in hypergraph, respectively by the corner temporal evolution Drawing of Curve at plastic hinge 1 place in Fig. 7, by the corner temporal evolution Drawing of Curve at detailed finite element model and simplified model plastic hinge 2 places in Fig. 8.The corner at simplified model plastic hinge 1 place is slightly larger than the corner at detailed finite element model plastic hinge 1 place as seen from Figure 7, but the corner of overall trend and in detail finite element model coincide, the corner at simplified model plastic hinge 2 places is slightly less than the corner at detailed finite element model plastic hinge 2 places as seen from Figure 8, but the corner of overall trend and in detail finite element model coincide.Fig. 5 is the contrast deformation pattern directly perceived of the detailed finite element model of Thin-walled Curved Beams and simplified model, and as seen from Figure 5, the deformation tendency of simplified model and in detail finite element model is basically identical.By detailed finite element model and simplified model interior can temporal evolution Drawing of Curve in Fig. 6, the interior of simplified model absorption can be slightly less than the interior energy that detailed finite element model absorbs in the collision starting stage as seen from Figure 6, interior can the reaching unanimity of simplified model and detailed finite element model absorption when collision closes to an end.Below during extraction time T=10ms, in detail finite element model and simplified model distortion and interior can aspect data contrast, specifically data are consulted shown in table 2.
Table 2
By more known, simplified model can situation show the interior of the deformation form of detailed finite element model in collision process and absorption well.This Thin-walled Curved Beams plastic hinge that has proved that the present invention proposes is simplified the accuracy of analytical approach, and has greatly reduced the time that model emulation calculates.
The present invention just be take single hat section Thin-walled Curved Beams and is introduced as example, the Thin-walled Curved Beams plastic hinge that the present invention proposes is simplified analytical approach and is applicable to any section form, as long as the moment of flexure of non-linear rotation spring unit and corner (M (θ)-θ) curve are replaced with to moment of flexure and corner (M (θ)-θ) curve of respective cross-section.The version of Thin-walled Curved Beams is also not limited to the structure shown in Fig. 3 or Fig. 4, front rail structure in vehicle body, A post bending structure, the Thin-walled Curved Beams that B post bending structure etc. can adopt the present invention to propose collides crooked simplification analytical approach and carries out Simulation and analysis.
Claims (4)
1. body of a motor car Thin-walled Curved Beams collides a crooked simplification analytical approach, comprises the following steps:
The first step, extract moment of flexure and corner (M (θ)-θ) relation curve:
First in catia, set up 3 dimension models;
Secondly model is imported in hypermesh and carry out model processing, grid is divided, and imposed load and boundary condition;
Second step, the foundation of simplified model:
First in hypermesh, adopt elytschko-Schwer resultant beam element to replace the shell unit of detailed model, set up the main body of simplifying Thin-walled Curved Beams model, adjacent beam element end points is around the corner two nodes that volume coordinate is identical;
Secondly between two identical nodes of volume coordinate, set up non-linear rotation spring unit, and as loading curve assignment, give non-linear rotation spring using the DAT form moment of flexure obtaining in the first step and corner (M (θ)-θ) relation curve;
The 3rd step, the simplified model that second step is set up imports dyna and calculates, and by the contrast of detailed model and simplified model result curve, by compare energy temporal evolution situation in Thin-walled Curved Beams detailed model and simplified model in hypergraph, plastic hinge 1 and plastic hinge 2 place's corner temporal evolution situations are verified the correctness of simplified model.
2. a kind of body of a motor car Thin-walled Curved Beams according to claim 1 collides crooked simplification analytical approach, it is characterized in that:
In the first step, the moment of flexure of bearing when the bending in order to measure Thin-walled Curved Beams, need set up in Thin-walled Curved Beams corner the cross section of XSectionPlane type;
Then model is imported and in LS-dyna, carry out collision simulation simulation;
Finally destination file is imported in hypergraph, plastic hinge moment of flexure and corner (M (θ)-θ) relation curve while extracting thin walled beam bending, it is standby that curve need export as DAT formatted file.
3. a kind of body of a motor car Thin-walled Curved Beams according to claim 1 collides crooked simplification analytical approach, it is characterized in that:
In second step, for the proper exercise relation in analogy model crash analysis process better, at non-linear rotation spring cell node place, set up post hinge unit, with this, retrain between two nodes that adjacent beams unitary space coordinate is identical and can only relatively rotate, can not relatively move;
Then at non-linear rotation spring cell node place, set up damping unit, distortion and energy absorption characteristics that simplified model is shown in collision process are more accurate;
Finally simplified model is applied to the load identical with detailed model and boundary condition.
4. a kind of body of a motor car Thin-walled Curved Beams according to claim 1 collides crooked simplification analytical approach, it is characterized in that:
The moment of flexure of described non-linear rotation spring unit and corner (M (θ)-θ) curve is replaced with moment of flexure and corner (M (θ)-θ) curve of respective cross-section, to be applicable to the Thin-walled Curved Beams plastic hinge of any section form, simplify analytical approach, comprising: the front rail structure in vehicle body, A post bending structure or B post bending structure.
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Cited By (6)
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| CN104392031A (en) * | 2014-11-13 | 2015-03-04 | 大连理工大学 | Design method of variable cross-section beam of automobile body in white |
| CN104573246A (en) * | 2015-01-11 | 2015-04-29 | 吉林大学 | Front impact conceptual model design method for front structure of automobile |
| CN106021701A (en) * | 2016-05-17 | 2016-10-12 | 吉林大学 | Car body beam frame collision modeling and analysis method considering characteristics of plastic hinge |
| CN107529642A (en) * | 2017-07-28 | 2018-01-02 | 江苏大学 | The theoretic prediction methods of single shape for hat thin-walled beam deflection collapse energy-absorption |
| CN109684675A (en) * | 2018-12-04 | 2019-04-26 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aviation thin-walled support intensity analysis method based on the coupling of abaqus plate body |
| CN112329123A (en) * | 2019-07-19 | 2021-02-05 | 广州汽车集团股份有限公司 | Frame vehicle body collision concept design method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392031A (en) * | 2014-11-13 | 2015-03-04 | 大连理工大学 | Design method of variable cross-section beam of automobile body in white |
| CN104573246A (en) * | 2015-01-11 | 2015-04-29 | 吉林大学 | Front impact conceptual model design method for front structure of automobile |
| CN106021701A (en) * | 2016-05-17 | 2016-10-12 | 吉林大学 | Car body beam frame collision modeling and analysis method considering characteristics of plastic hinge |
| CN106021701B (en) * | 2016-05-17 | 2018-10-19 | 吉林大学 | Consider coachbuilt body beam framework collision modeling and the analysis method of plastic hinge characteristic |
| CN107529642A (en) * | 2017-07-28 | 2018-01-02 | 江苏大学 | The theoretic prediction methods of single shape for hat thin-walled beam deflection collapse energy-absorption |
| CN107529642B (en) * | 2017-07-28 | 2020-07-31 | 江苏大学 | Theoretical prediction method for bending and crushing energy absorption of single-cap type thin-walled beam |
| CN109684675A (en) * | 2018-12-04 | 2019-04-26 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aviation thin-walled support intensity analysis method based on the coupling of abaqus plate body |
| CN109684675B (en) * | 2018-12-04 | 2023-04-18 | 中国航空工业集团公司西安飞机设计研究所 | Method for analyzing strength of aviation thin-wall support based on abaqus plate coupling |
| CN112329123A (en) * | 2019-07-19 | 2021-02-05 | 广州汽车集团股份有限公司 | Frame vehicle body collision concept design method |
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