CN108549749A - A kind of fatigue life calculation method of material suction vehicle sliding plate - Google Patents
A kind of fatigue life calculation method of material suction vehicle sliding plate Download PDFInfo
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- 238000004364 calculation method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims description 10
- 230000001050 lubricating effect Effects 0.000 claims description 3
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- 239000010881 fly ash Substances 0.000 description 2
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- 238000004904 shortening Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention discloses a kind of computational methods of material suction vehicle sliding plate fatigue life, by carrying out kinematic analysis to finite element model, obtain the transient stress of maximum stress node under the conditions of different material density, sliding plate inclination angle, mileage travelled, then the fatigue life of suction operating mode and discharge operating mode, driving cycle sliding plate is calculated separately, on this basis, the total fatigue life of sliding plate is calculated, finally establishes the sliding plate fatigue life quadratic polynomial computation model under the conditions of different material density, different sliding plates inclination angle, different mileages travelled.The computational methods of material suction vehicle sliding plate fatigue life disclosed by the invention a kind of, Calculation of Fatigue Life can be carried out to material suction vehicle sliding plate, analysis time is reduced, computational efficiency and precision are high, while also providing engineering foundation for the material selection of sliding plate.
Description
Technical field
The invention belongs to material suction vehicle emulation field more particularly to a kind of fatigue life gages of material suction vehicle sliding plate
Calculation method.
Background technology
Material suction vehicle is the professional logistics vehicle for being engaged in loose unpacked material transport, for powder such as miberal powder, flyash, grains
The whole enclosed conveying of granular dry loose unpacked material, to reducing the loss of loose unpacked material, reducing terminal charges, saving packing timber
Material, improvement worker working condition, raising working efficiency, environmental protection have a very important significance.The work of material suction vehicle
Principle is to generate negative pressure using vacuum pump material is sucked tank interior, then suction vehicle is reached appointed place, is compressed with air
Machine generates positive pressure, and the compressed air with certain pressure is made fluidization of material by fluidization equipment, is sent to by pipeline
In specified feedstock feed bin, discharging operations are realized.
Sliding plate is the important load-carrying unit of material suction vehicle fluidization equipment, while being also its fatigue damage most serious
Component.When suction, sliding plate supports gas chamber and is acted on by the pressure of material, is incrementally increased with the increase pressure of inlet amount；Fortune
During defeated, by the dynamic impulsion force effect of material；When discharging, the pressure effect of compressed air is born.The country reports more
The fatigue cracking accident of material suction vehicle sliding plate is played, some sliding plates are even with just generating cracking, sliding plate less than half a year
Cracking can make sliding plate inner cavity buildup, and discharging remnants rates is caused to increase, and so that material suction vehicle discharge performance is declined, eventually lead to tank
Body inner plenum product has a large amount of material stocks and cannot be discharged, so the service life of sliding plate is the hot spot studied at present.
By establishing the mathematical model of sliding plate fatigue life prediction, the quick and accurate of sliding plate Calculation of Fatigue Life is realized
Really, numerical computations are made to become the effective tool of research sliding plate fatigue life, for improving product quality, shortening research and development week
Phase has a very important significance.But at present the fatigue life calculation method in relation to material suction vehicle sliding plate correlation at
Fruit is less at home and abroad, and the Life Calculating Methods of sliding plate are confined to traditional Experience Design and general longevity at present
Computational theory is ordered, the geometrical model used is sliding plate itself, ignores its connection with tank body, leads to the accurate of result of calculation
Property and computational efficiency are difficult to ensure.
Invention content
The purpose of the present invention：A kind of fatigue life method for calculating material suction vehicle sliding plate is provided, the party is passed through
Method solves the service life computational problem before development test and sizing, is design and its tired longevity of material suction vehicle sliding plate
Life optimization design establishes Research foundation.
Technical solution：For achieving the above object, technical scheme is as follows：
A kind of computational methods of material suction vehicle sliding plate fatigue life, its step are as follows：
(1) finite element model of material suction vehicle sliding plate is established；
(2) calculate suction operating mode, discharge operating mode sliding plate fatigue life；
(3) fatigue life of driving cycle sliding plate is calculated；
(4) step (2) and step (3) is combined to calculate total fatigue life of sliding plate；
(5) step (2), step (3), step (4) are repeated, the sliding plate fatigue life under different parameters is calculated；
(6) on the basis of step (5), structure sliding plate Calculation of Fatigue Life model is to carry out the calculating of fatigue life.
Wherein, in step (1), foundation includes the sliding plate 3D global finite element models of tank body, uses Three-dimensional CAD Software
Foundation includes the sliding plate 3D whole geometry models of tank body, and the geometrical model of sliding plate is imported in finite element software, and definition is single
Material parameter is arranged in element type, defines mesh generation parameter and carries out mesh generation, and wherein sliding plate is carried out with tank body junction
Tessellated mesh divides, and improves the precision of grid Strength co-mputation.
Wherein, in step (2), material suction vehicle suction operating mode and discharge operating mode sliding plate fatigue life is calculated, is being had
Load and the constraint for applying material suction vehicle suction operating mode and discharge operating mode in finite element analysis software to sliding plate, carry out intensity
It calculates, obtains maximum stress and node and its stress calculation of dynamic response value occurs.Obtained node stress-time graph is carried out
Rain-flow counting corrects mean stress using Goodman formula, according to S-N Curve and Miner linear cumulative damage laws,
The fatigue life N that node occurs for maximum stress is calculated using Calculation of Fatigue Life softwarei。
Wherein, in step (3), driving cycle sliding plate fatigue life is calculated, uses the finite element established in step (1)
Model applies sliding plate the dynamic impact forces of suction vehicle material when driving, carries out Strength co-mputation, obtains maximum in step (2)
The stress calculation of dynamic response value of node occurs for stress.Rain-flow counting is carried out to obtained node stress-time graph, is used
Goodman formula correct mean stress and use fatigue life gage according to S-N Curve and Miner linear cumulative damage laws
It calculates software and the fatigue life N that node occurs for maximum stress when mileage travelled is L Km is calculatedj。
Wherein, in step (4), the total fatigue life method for calculating sliding plate is as follows：
Wherein, total damage when α is failure, NiIt is that material suction vehicle suction operating mode and discharge operating mode maximum stress save
The fatigue life of point, NjIt is the fatigue life of the maximum stress generation node corresponding to driving cycle.
Wherein, in step (5), the different parameters include：Material density, sliding plate inclination angle, mileage travelled calculate
Mileage travelled condition between several groups different material density, different sliding plates inclination angle, different suction operating modes and discharge operating mode
Under sliding plate fatigue life.It is repeated in step (2), step (3), step (4), obtains several groups different material density, no
With the sliding plate fatigue life under the conditions of sliding plate inclination angle, different mileages travelled.
Wherein, in step (6), the several groups different material density that is obtained in conjunction with step (5), sliding plate inclination angle, row
It sails the sliding plate fatigue life of mileage, structure sliding plate quadratic polynomial Calculation of Fatigue Life model is as follows：
Wherein, x1For material density, units/kg/m3, x2For sliding plate inclination angle, unit/°, x3For mileage travelled, unit
Km, a1~a9For fitting coefficient.
The invention discloses a kind of computational methods of material suction vehicle sliding plate fatigue life, by finite element model into
Action edge is analyzed, and the transient stress of maximum stress node under the conditions of different material density, sliding plate inclination angle, mileage travelled is obtained
Then course calculates separately suction operating mode and discharge operating mode, row according to S-N Curve and Miner linear cumulative damage laws
It sails the fatigue life of operating mode sliding plate, sliding plate total fatigue life is calculated according to Miner linear cumulative damage laws, finally build
The sliding plate fatigue life stood under the conditions of different material density, different sliding plate inclination angle, different mileages travelled is secondary multinomial
Formula computation model.A kind of computational methods of material suction vehicle sliding plate fatigue life of the present invention, can be to material suction vehicle sliding plate
Calculation of Fatigue Life is carried out, computational efficiency and precision are high, while also providing engineering foundation for the material selection of sliding plate.
Advantageous effect：Compared with prior art, the present invention having the following advantages that：
(1) present invention establishes sliding plate fatigue life quadratic polynomial computation model, realizes to sliding plate fatigue life
Accurate calculating.
(2) present invention not only can accurately analyze the fatigue life of sliding plate, but also considerably reduce analysis time；
And there is excellent universality, can be generalized to the service life calculating using the sliding plate of other materials, result of calculation helps
Existing algorithm is improved in technical staff, reliable basis is provided for structure design.
Description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the lubricating substance plate structure schematic diagram including tank body of the present invention；
Fig. 3 is the load diagram of the sliding plate suction operating mode of the present invention；
Fig. 4 is the load diagram of the sliding plate discharge operating mode of the present invention；
Fig. 5 is the load diagram of the sliding plate driving cycle of the present invention.
Specific implementation mode
The present invention is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, the present embodiment provides a kind of fatigue life calculation method of material suction vehicle sliding plate, including it is following
Step：
(1) foundation includes the sliding plate 3D global finite element models of tank body, the use of Three-dimensional CAD Software foundation includes tank body
Sliding plate 3D whole geometry models import the geometrical model of sliding plate in finite element software, definition unit type, and material is arranged
Parameter defines mesh generation parameter and carries out mesh generation, and wherein sliding plate carries out tessellated mesh division with tank body junction, carefully
Change mesh generation to refer to for grid being contracted to the 50%~70% of former size of mesh opening.
(2) material suction vehicle suction operating mode and discharge operating mode sliding plate fatigue life are calculated, in finite element analysis software
Apply load and the constraint of material suction vehicle suction operating mode and discharge operating mode to sliding plate, carries out Strength co-mputation, obtain maximum
Node and its stress calculation of dynamic response value occur for stress, carry out rain-flow counting to obtained node stress-time graph, use
Goodman formula correct mean stress and use fatigue life gage according to S-N Curve and Miner linear cumulative damage laws
It calculates software and the fatigue life N that node occurs for maximum stress is calculatedi。
(3) driving cycle sliding plate fatigue life is calculated, using the finite element model established in step (1), to sliding plate
Apply the dynamic impact forces of suction vehicle material when driving, carry out Strength co-mputation, obtains maximum stress in step (2) and node occurs
Stress calculation of dynamic response value is carried out rain-flow counting to obtained node stress-time graph, is corrected using Goodman formula
Mean stress is calculated according to S-N Curve and Miner linear cumulative damage laws using Calculation of Fatigue Life software
The fatigue life N of node occurs for maximum stress when mileage travelled is L Kmj。
(4) the total fatigue life for calculating sliding plate is calculated according to Miner linear cumulative damage laws using following formula
Total fatigue life of sliding plate：
In formula, total damage when α is failure.
(5) it calculates between several groups different material density, different sliding plates inclination angle, different suction operating modes and discharge operating mode
Mileage travelled under the conditions of sliding plate fatigue life, be repeated in step (2), step (3), step (4), obtain several groups not
Sliding plate fatigue life under the conditions of same material density, different sliding plates inclination angle, different mileages travelled, and count for convenience
It calculates, by the sliding plate fatigue life value under the conditions of several groups different material density, different sliding plates inclination angle, different mileages travelled
It is converted into lg (N).
(6) quadratic polynomial Calculation of Fatigue Life model is established, the several groups different material obtained in conjunction with step (5) is close
Degree, sliding plate inclination angle, mileage travelled sliding plate fatigue life lg (N), establish following sliding plate Calculation of Fatigue Life mould
Type：
In formula：x1For material density, units/kg/m3, x2For sliding plate inclination angle, unit/°, x3For mileage travelled, unit
Km, a1~a9For fitting coefficient.
Further：In the step (1), the geometry entity model of sliding plate is established using Three-dimensional CAD Software, it will be therein
Dimensional parameters establish Parametric geometric model, and new geometry entity model can be obtained by changing the parameter value in model,
Physical model has been converted to by being converted to international standard format or being imported in finite element analysis software with sophisticated interface module
Limit meta-model.
Further：In the step (1), parametrical finite element calculation procedure is established, by material density, density of material, material
The parameters such as material elasticity modulus are parameterized, and can be calculated automatically again by the parameter value in reprogramming.
Further：In the step (2) and step (3), in parametrical finite element calculation procedure, after the completion of calculating, program
Node occurs for automatic screening maximum stress, and stress-time result of calculation of maximum stress generation node is output to text automatically
In this document.
Further：In the step (2) and step (3), load, the discharge operating mode of material suction vehicle suction operating mode sliding plate
The load of sliding plate, the dynamic impact forces of driving cycle sliding plate are added in finite element software in the form of text file
It carries.
Further：In the step (6), step (5) is obtained using Design-Expert softwares material density, cunning
Flitch inclination angle, mileage travelled and the mapping relations between fatigue life carry out quadratic polynomial fitting.
By taking powder grain material suction vehicle sliding plate as an example, steps are as follows for specific calculating：
(1) foundation includes the sliding plate 3D global finite element models of tank body
The whole 3D models that powder grain material suction vehicle tank and sliding plate are established using Croe, as shown in Fig. 2, tank body and cunning
Flitch material is Q235, and sliding plate is 43 ° with respect to Tank tilting angle；The material of transport is flyash, density 700kg/m3, inhale
Expect that the mileage travelled between operating mode and discharge operating mode is 50km；Using the interface module of Croe and ANSYS, by sliding plate pattern number
According to being transferred to ANSYS, the material data defined in ANSYS, Elastic Modulus 217.8GPa, Poisson's ratio 0.222, density
For 7.872*10-6kg/mm3；Setting unit length of side 5mm, sliding plate are set as 2mm, the two with the tank body join domain unit length of side
Between the gradual transition of the unit length of side, selecting unit type be Solid92, selecting unit mesh generation type be Free, execute net
Lattice, which divide, obtains model finite element grid.
(2) material suction vehicle suction operating mode and discharge operating mode sliding plate stress response and fatigue life are calculated
Apply the dynamic of material suction vehicle suction operating mode and discharge operating mode to sliding plate in finite element analysis software ANSYS
Pressure loading is applied to sliding plate upper surface in a manner of table load as shown in Figure 3, Figure 4, when applying discharge in the same fashion
Dynamic pressure load, sliding plate lower surface is applied in a manner of table load, the node region being connected with vehicle frame to tank body is applied
It is all to add displacement constraint；Solution option is set, carries out Strength co-mputation, obtains maximum using general preprocessor POST1 after the completion
Node occurs for stress, and usage time course processor POST26 obtains maximum stress and node stress value dynamic response curve occurs.
Rain-flow counting is carried out to node stress-time graph, mean stress is corrected using Goodman formula, according to S-N Curve and
The fatigue life N that node occurs for maximum stress is calculated using Msc.fatigue softwares in Miner linear cumulative damage lawsi
It is 32756.
(3) stress response and the fatigue life of driving cycle sliding plate are calculated
Apply dynamic pressure load when driving cycle to sliding plate in finite element analysis software ANSYS, such as Fig. 5 institutes
Show, sliding plate upper surface is applied in a manner of table load, applying displacement constraint to the node region that tank body is connected with vehicle frame is
all；Solution option is set, carries out Strength co-mputation, obtains maximum stress using general preprocessor POST1 after the completion and save
Point, usage time course processor POST26 obtain maximum stress and node stress value dynamic response curve occur；To node stress-
Time graph carries out rain-flow counting, corrects mean stress using Goodman formula, is linearly tired out according to S-N Curve and Miner
The fatigue life N that node occurs for maximum stress is calculated using Msc.fatigue softwares in product defect theoryjIt is 48173.
(4) total fatigue life of sliding plate is calculated
According to Miner linear cumulative damage laws, total fatigue life N=19498 of sliding plate is obtained using formula (1), and
It is converted into lg (N)=4.29.
(5) the sliding plate tired longevity of several groups different material density, different sliding plates inclination angle, different mileages travelled is calculated
Life
It is repeated in step (2), step (3), step (4), it is respectively 700kg/m to obtain material density3、1800kg/m3、
4200kg/m3, sliding plate inclination angle is respectively 43 °, 44 °, 45 °, the mileage travelled difference between suction operating mode and discharge operating mode
For the sliding plate fatigue life lg (N) under the conditions of 50km, 100km, 150km, the results are shown in Table 1：
Sliding plate fatigue under the conditions of several groups difference sliding plate inclination angle, mileage travelled obtained by the calculating of 1 present invention of table
Service life numerical tabular；
(6) quadratic polynomial Calculation of Fatigue Life model is established
Using several groups different material density, the difference of the sliding plate that Design-Expert software combination steps (5) obtain
Sliding plate inclination angle, different mileage travelled sliding plate fatigue life lg (N) carry out quadratic polynomial the Fitting Calculation, the height of foundation
The quadratic polynomial Calculation of Fatigue Life model of the sliding plate of precision is：
The material density of sliding plate, sliding plate inclination angle, mileage travelled are substituted into above-mentioned fatigue life model, carry out lubricating substance
Plate Calculation of Fatigue Life, result of calculation is as shown in table 2, as can be seen from Table 2, the result of calculation that service life computation model is calculated
Relative error is 0.49%~4.39%, meets the computational accuracy requirement of project analysis 5%, therefore, can utilize secondary multinomial
Formula fatigue life model calculates the fatigue life of sliding plate.
The contrast table of the quadratic polynomial computation model calculated value and fatigue life value of the sliding plate of 2 present invention of table
Claims (9)
1. a kind of fatigue life calculation method of material suction vehicle sliding plate, it is characterised in that：
(1) finite element model of material suction vehicle sliding plate is established；
(2) calculate suction operating mode, discharge operating mode sliding plate fatigue life；
(3) fatigue life of driving cycle sliding plate is calculated；
(4) step (2) and step (3) is combined to calculate total fatigue life of sliding plate；
(5) step (2), step (3), step (4) are repeated, the sliding plate fatigue life under different parameters is calculated；
(6) on the basis of step (5), structure sliding plate Calculation of Fatigue Life model is to carry out the calculating of fatigue life.
2. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (1), the finite element model method for establishing material suction vehicle sliding plate is as follows：Initially set up lubricating substance slab geomitry mould
Type builds finite element model on this basis.
3. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (1), when establishing the finite element model of material suction vehicle sliding plate, mesh generation is carried out to geometrical model.
4. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 3, it is characterised in that：It is several
What model meshes division includes carrying out tessellated mesh division to sliding plate and tank body junction.
5. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (2), the calculating suction operating mode, the fatigue life method of discharge operating mode sliding plate are as follows：Material is applied to sliding plate
The fatigue life that node occurs for maximum stress is calculated in the load and constraint of suction vehicle suction operating mode and discharge operating mode.
6. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (3), the fatigue life method for calculating driving cycle sliding plate is as follows：Suction vehicle object when driving is applied to sliding plate
The fatigue life that node occurs for the maximum stress corresponding to driving cycle is calculated in the dynamic impact forces of material.
7. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (4), the total fatigue life method for calculating sliding plate is as follows：
Wherein, total damage when α is failure, NiIt is that node occurs for material suction vehicle suction operating mode and discharge operating mode maximum stress
Fatigue life, NjIt is the fatigue life of the maximum stress generation node corresponding to driving cycle.
8. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (5), the different parameters include：Material density, sliding plate inclination angle, mileage travelled.
9. a kind of fatigue life calculation method of material suction vehicle sliding plate according to claim 1, it is characterised in that：
In step (6), the structure sliding plate quadratic polynomial Calculation of Fatigue Life model is as follows：
Wherein, x1For material density, unit kg/m3, x2For sliding plate inclination angle, unit is ° x3For mileage travelled, unit is
Km, a1~a9For fitting coefficient.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109598079A (en) * | 2018-12-12 | 2019-04-09 | 中国北方发动机研究所(天津) | A kind of cylinder head subregion Fatigue Life Prediction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109598079A (en) * | 2018-12-12 | 2019-04-09 | 中国北方发动机研究所(天津) | A kind of cylinder head subregion Fatigue Life Prediction method |
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Application publication date: 20180918 Assignee: Jiangsu jihongte Special Automobile Manufacturing Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2023980047356 Denomination of invention: A fatigue life calculation method for the sliding plate of a material suction and discharge vehicle Granted publication date: 20221014 License type: Common License Record date: 20231118 |