CN103838975A - Method and device for calculating fatigue life of vehicle welding lines - Google Patents
Method and device for calculating fatigue life of vehicle welding lines Download PDFInfo
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- CN103838975A CN103838975A CN201410100821.2A CN201410100821A CN103838975A CN 103838975 A CN103838975 A CN 103838975A CN 201410100821 A CN201410100821 A CN 201410100821A CN 103838975 A CN103838975 A CN 103838975A
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Abstract
The invention provides a method and device for calculating the fatigue life of vehicle welding lines. The method for calculating the fatigue life of the vehicle welding lines comprises the step of acquiring the loads of a vehicle under different fatigue strength working conditions, the step of establishing a finite element model comprising the joints of the vehicle welding lines according to the geometric model of the vehicle, the step of loading the loads into the finite element model to calculate the structural stress of the welding lines, and the step of calculating the fatigue life of the welding lines according to the structural stress. By means of the method, the fatigue life of the welding lines of the vehicle made of aluminum alloy is calculated, the main factors affecting the fatigue resistance of the welding lines of the vehicle made of the aluminum alloy are shown through a structural stress body, and the problem that fatigue life analysis data errors of the welding lines are large through the nominal stress method in the prior art is solved.
Description
Technical field
The present invention relates to mechanical technique, relate in particular to a kind of car body weld fatigue Life Calculating Methods and device.
Background technology
Along with China Express Railway constantly puts into effect, the reliability of EMU faces test, and car body welded frame is the position that needs most concern, and the inefficacy that welded frame is general is the fatigure failure of commissure in welded structure.
Bullet train aluminum alloy bodywork complex structure, weld seam quantity are large, position relationship complexity between weld seam.At present, weld fatigue life appraisal to high-speed train body is little, what have is also the standard of the welded structure analysis of fatigue based on nominal stress method, as: the BS7608 of Britain, in engineering application, welding joint classification is difficult to hold, in the time calculating nominal stress with finite element method, because the division of welding position grid and size of mesh opening in finite element analysis process are larger on this region name stress value impact, so be difficult to obtain the accurate nominal stress value on weld seam.Therefore the analysis of fatigue data error that, nominal stress method draws is larger.
Summary of the invention
The invention provides a kind of car body weld fatigue Life Calculating Methods and device, the larger problem of weld fatigue durability analysis data error drawing to overcome available technology adopting nominal stress method.
First aspect, the invention provides a kind of car body weld fatigue Life Calculating Methods, comprising:
Obtain the load of different fatigue intensity operating mode lower body;
Set up finite element model according to the geometric model of described car body; Wherein, described finite element model comprises the node of the weld seam of described car body;
Described load is loaded into the structural stress that calculates described weld seam on described finite element model;
According to the fatigue lifetime of weld seam described in described computation of structure stress.
Alternatively, the described structural stress that calculates described weld seam on described finite element model that described load is loaded into, comprising:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
Alternatively, according to the fatigue lifetime of weld seam described in described computation of structure stress, comprising:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
Second aspect, the invention provides a kind of car body weld fatigue life-span calculation element, comprising:
Acquisition module, for obtaining the load of different fatigue intensity operating mode lower body;
Model building module, sets up finite element model for the geometric model according to described car body; Wherein, described finite element model comprises the node of the weld seam of described car body;
Processing module, for described load being loaded into the structural stress that calculates described weld seam on described finite element model, according to the fatigue lifetime of weld seam described in described computation of structure stress.
Alternatively, described processing module, specifically for:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
Alternatively, described processing module, specifically for:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
Car body weld fatigue Life Calculating Methods of the present invention and device, by finite element model computing method, the load of the different fatigue intensity operating mode lower body getting is loaded into the structural stress that calculates car body weld seam on finite element model, final according to the fatigue lifetime of computation of structure stress weld seam, realize the Calculation of Fatigue Life to aluminum alloy bodywork weld seam, and the principal element that affects aluminum alloy bodywork weld seam anti-fatigue ability is embodied by equivalent structure stress, solve the larger problem of weld fatigue durability analysis data error that available technology adopting nominal stress method draws.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of car body weld fatigue Life Calculating Methods embodiment mono-of the present invention;
Fig. 2 is the car body weld seam schematic diagram one of the inventive method embodiment mono-;
Fig. 3 is the weld seam node schematic diagram of the inventive method embodiment mono-;
Fig. 4 is the structural stress curve synoptic diagram of the fatigue strength operating mode one of the inventive method embodiment mono-;
Fig. 5 is the structural stress curve synoptic diagram of the fatigue strength operating mode two of the inventive method embodiment mono-;
Fig. 6 is the structural stress curve synoptic diagram of the fatigue strength operating mode three of the inventive method embodiment mono-;
Fig. 7 is the structural stress curve synoptic diagram of the fatigue strength operating mode four of the inventive method embodiment mono-;
Fig. 8 is the structural stress curve synoptic diagram of the fatigue strength operating mode five of the inventive method embodiment mono-;
Fig. 9 is the structural stress curve synoptic diagram of the fatigue strength operating mode six of the inventive method embodiment mono-;
Figure 10 is the structural stress curve synoptic diagram of the fatigue strength operating mode seven of the inventive method embodiment mono-;
Figure 11 is the structural representation of car body weld fatigue life-span calculation element embodiment mono-of the present invention.
Embodiment
Fig. 1 is the process flow diagram of car body weld fatigue Life Calculating Methods embodiment mono-of the present invention.Fig. 2 is the car body weld seam schematic diagram one of the inventive method embodiment mono-.Fig. 3 is the weld seam node schematic diagram of the inventive method embodiment mono-.As shown in Figure 1, the method for the present embodiment can comprise:
Particularly, the application of the embodiment of the present invention can be car car body MODEL C RH3-380 in the middle of bullet train aluminum alloy T C, based on the online test standard of car body, obtains car body load under different fatigue intensity operating mode on actual track, as shown in table 1 below:
The loadmeter of table 1 different fatigue intensity operating mode lower body
G=9.8N/kg in table 1.
Particularly, determine the position while welding (arrow indication position as shown in Figure 2) of all care of car body; Create the complete car body finite element model that comprises weld seam according to the geometric model of car body, finite element model is divided into described car body the node connecting between unit and unit.
For example can adopt HyperMesh is that three-dimensional modeling platform is set up finite element model, the Calculation and Analysis Platform that ANSYS software is finite element model.
Alternatively, load is loaded into the structural stress that calculates weld seam on finite element model, comprises:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
Particularly, as shown in Figure 3, divide i unit Ei on weld seam, the value of i is from 1 ... n-1, n node Nj, the value of j is from 1 ... n, according to each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
xcalculate the linear load f of each node according to formula (1) and (2)
ywith line moment of flexure m
x, and by the linear load f of each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
Wherein, l
ibe the distance of i node and i+1 node, the value of i is from 1 ... n-1; F
yjbe the nodal force of j node, f
yjbe the linear load of j node, M
yjbe the nodal moment of j node, m
yibe the line moment of flexure of j node, the value of j is from 1 ... n.
By the linear load f after each node coordinate conversion
y'with line moment of flexure m
x'according to
calculate the structural stress σ of each node
s; Wherein t is the thickness of described car body commissure material,
Alternatively, according to the fatigue lifetime of computation of structure stress weld seam, comprising:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
Particularly, according to formula
calculate the fatigue lifetime of each node, wherein equivalent structure stress
m is constant, general m=3.6, and I (r) is for describing the function of load modes effect, and wherein r is bend ratio σ
b/ σ
s, as
c and h are main S-N curve test constant, can get as the value in following table 2:
The main S-N curve of table 2 test parameters table
In table 2, σ represents the standard deviation of S-N curve data collection dispersion.
Above-mentioned equivalent structure stress comprises the principal element that affects the weld fatigue life-span, as the definition of the structural design factors such as the shape of weld seam, force way, weld size and welding quality, the main failure mode that occurs etc.
Fig. 4 is the structural stress curve synoptic diagram of the fatigue strength operating mode one of the inventive method embodiment mono-.Fig. 5 is the structural stress curve synoptic diagram of the fatigue strength operating mode two of the inventive method embodiment mono-.Fig. 6 is the structural stress curve synoptic diagram of the fatigue strength operating mode three of the inventive method embodiment mono-.Fig. 7 is the structural stress curve synoptic diagram of the fatigue strength operating mode four of the inventive method embodiment mono-.Fig. 8 is the structural stress curve synoptic diagram of the fatigue strength operating mode five of the inventive method embodiment mono-.Fig. 9 is the structural stress curve synoptic diagram of the fatigue strength operating mode six of the inventive method embodiment mono-.Figure 10 is the structural stress curve synoptic diagram of the fatigue strength operating mode seven of the inventive method embodiment mono-.As shown in Fig. 4～10, horizontal ordinate be starting point along bead direction distance, starting point can be the position of first node N1 as shown in Figure 3, ordinate represents structural stress value.Be worth N the fatigue lifetime that can calculate each node according to the structural stress shown in Fig. 4～10 and equivalent structure stress, and part of nodes is as shown in table 3 below:
Table 3 N fatigue lifetime result of calculation
In table 3, node number represents the node serial number in whole car body finite element model.
The present embodiment, by finite element model computing method, the load of the different fatigue intensity operating mode lower body getting is loaded into the structural stress that calculates car body weld seam on finite element model, final according to the fatigue lifetime of computation of structure stress weld seam, realize the Calculation of Fatigue Life to aluminum alloy bodywork weld seam, and the principal element that affects aluminum alloy bodywork weld seam anti-fatigue ability is embodied by equivalent structure stress, solve the larger problem of weld fatigue durability analysis data error that available technology adopting nominal stress method draws.
Figure 11 is the structural representation of car body weld fatigue life-span calculation element embodiment mono-of the present invention, as shown in figure 11, the car body weld fatigue life-span calculation element 130 of the present embodiment can comprise: acquisition module 1301, model building module 1302 and processing module 1303; Wherein, acquisition module 1301, for obtaining the load of different fatigue intensity operating mode lower body; Model building module 1302, sets up finite element model for the geometric model according to described car body; Wherein, described finite element model comprises the node of the weld seam of described car body; Processing module 1303, for described load being loaded into the structural stress that calculates described weld seam on described finite element model, according to the fatigue lifetime of weld seam described in described computation of structure stress.
Alternatively, processing module 1303, specifically for:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
Alternatively, processing module 1303, specifically for:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
The device of the present embodiment, can be for the technical scheme of embodiment of the method shown in execution graph 1, and it realizes principle and technique effect is similar, repeats no more herein.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of programmed instruction.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a car body weld fatigue Life Calculating Methods, is characterized in that, comprising:
Obtain the load of different fatigue intensity operating mode lower body;
Set up finite element model according to the geometric model of described car body; Wherein, described finite element model comprises the node of the weld seam of described car body;
Described load is loaded into the structural stress that calculates described weld seam on described finite element model;
According to the fatigue lifetime of weld seam described in described computation of structure stress.
2. method according to claim 1, is characterized in that, the described structural stress that calculates described weld seam on described finite element model that described load is loaded into, comprising:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
3. method according to claim 2, is characterized in that, according to the fatigue lifetime of weld seam described in described computation of structure stress, comprising:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
4. a car body weld fatigue life-span calculation element, is characterized in that, comprising:
Acquisition module, for obtaining the load of different fatigue intensity operating mode lower body;
Model building module, sets up finite element model for the geometric model according to described car body; Wherein, described finite element model comprises the node of the weld seam of described car body;
Processing module, for described load being loaded into the structural stress that calculates described weld seam on described finite element model, according to the fatigue lifetime of weld seam described in described computation of structure stress.
5. device according to claim 4, is characterized in that, described processing module, specifically for:
By described load be loaded on described finite element model according to Finite Element Method calculate described weld seam each node along the axial nodal force F of y
ywith along the axial nodal moment M of x
x;
According to described nodal force F
ywith nodal moment M
xcalculate the linear load f of described each node
ywith line moment of flexure m
x, and by the linear load f of described each node
ywith line moment of flexure m
xconvert the axial linear load f along y' to
y'with along the axial line moment of flexure of x' m
x'; Wherein said y' axle be with described each node along the vertical direction of bead direction, described x' axle is the direction of described each node along weld seam;
By described linear load f
y'with described line moment of flexure m
x'according to
calculate the structural stress σ of described each node
s; Wherein said t is the thickness of described car body commissure material.
6. device according to claim 5, is characterized in that, described processing module, specifically for:
According to the fatigue lifetime of each node of weld seam described in the computation of structure stress of described each node
wherein said
described C and h are main S-N curve test constant, and described m is constant, and described I (r) is for describing the function of load modes effect, and wherein said r is bend ratio σ
b/ σ
s.
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| CN104820781A (en) * | 2015-05-06 | 2015-08-05 | 北京航空航天大学 | Prediction method of thermal fatigue life of BGA (Ball Grid Array) welding spot considering influence of sequential temperature cycling load loading |
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| CN105740551B (en) * | 2016-02-02 | 2018-06-29 | 湖南大学 | A kind of weld fatigue life-span prediction method |
| CN106354898B (en) * | 2016-06-28 | 2019-05-03 | 湖南工业大学 | A kind of weld fatigue Life Calculating Methods based on total strain energy metric density |
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