Project

Finite Element Analysis of buckling phenomena in the cyclone separator stand Using SOLIDWORKS

AAshutosh Kumar23 Jun 2020

Objective:

Analysis of buckling phenomena in the cyclone separator stand. With stiffener and Without stiffener.

comparison of both result.

Introduction:

Here I have one model of the cyclone separator. In which I will analyze the buckling of stand by applying a constant load of 150 KN at the top surface of a stand.

Model of cyclone separator,

Here I am taking material Alloy steel.

the body is treated as solid. The load applied on the top surface of the stand and bottom of the stand is fixed.

Material Properties:

Name:	Alloy Steel
Model type:	Linear Elastic Isotropic
Default failure criterion:	Max von Mises Stress
Yield strength:	6.20422e+08 N/m^2
Tensile strength:	7.23826e+08 N/m^2
Mass density:	7700 kg/m^3
Elastic modulus:	2.1e+11 N/m^2
Poisson's ratio:	0.28

Procedure:

Case 1:

First of all, we have to exclude the cyclone separator from the body and take the stand only in the analysis.

First, we have to analysis only stand without stiffener. Apply the boundary condition to the stand, create the mesh and start the analysis.

Volumetric Properties

Mass:204.99 kg

Volume:0.0266221 m^3

Density:7700 kg/m^3

Weight:2008.91 N

Study Information :

Study Name	Buckling 1
Analysis type	Buckling
Mesh type	Solid Mesh
Number of modes	1
Solver type	FFEPlus

The figure of the Mesh and boundary in the stand without stiffener.

Mesh Information:

Mesh type	Solid Mesh
Mesher Used:	Standard mesh
Automatic Transition:	Off
Include Mesh Auto Loops:	Off
Jacobian points	4 Points
Element Size	24.6807 mm
Tolerance	1.23403 mm
Mesh Quality Plot	High

Total Nodes	37110
Total Elements	18114
Maximum Aspect Ratio	7.3386

Study Result:

With true scale.

Name	Type	Min	Max
Amplitude	AMPRES: Resultant Amplitude Plot for Mode Shape: 1(Load Factor = 9.36692)	0.00000 Node: 1762	0.00346 Node: 716

Name

Type

Min

Max

Amplitude

AMPRES: Resultant Amplitude Plot for Mode Shape: 1(Load Factor = 9.36692)

0.00000

Node: 1762

0.00346

Node: 716

Buckling factor Of safety = 9.3669

Case 2:

Here I added the additional stiffener in the stand which supports the prevents the buckling as well as bending.

Here first I run the basic simulation In which I put the stiffener at the 1000mm from the top of the stand.

The total height of the legs of the stand is 2000mm.

start the simulation define the boundary condition, material and Create the mesh. Then run the simulation.

Study Information :

Study name	Buckling 1
Analysis type	Buckling
Mesh type	Solid Mesh
Number of modes	1
Solver type	FFEPlus

The Figure of the cyclone separator base with mesh and boundary condition.

Volumetric Properties

Mass:255.522 kg

Volume:0.0331846 m^3

Density:7700 kg/m^3

Weight:2504.11 N

Mesh Information :

Mesh type	Solid Mesh
Mesher Used:	Standard mesh
Automatic Transition:	Off
Include Mesh Auto Loops:	Off
Jacobian points	4 Points
Element Size	26.4073 mm
Tolerance	1.32036 mm
Mesh Quality Plot	High

Total Nodes	39594
Total Elements	19549
Maximum Aspect Ratio	10.17

Study Result :

Name	Type	Min	Max
Amplitude2	AMPRES: Resultant Amplitude Plot for Mode Shape: 1(Load Factor = 25.7397)	0.00000 Node: 2354	0.00333 Node: 1456

Name

Type

Min

Max

Amplitude2

AMPRES: Resultant Amplitude Plot for Mode Shape: 1(Load Factor = 25.7397)

0.00000

Node: 2354

0.00333

Node: 1456

Buckling FActor of safety = 25.74

Here to find out the best suitable height for the stiffener I perform the Design study In with I sat the different parameters which taken in the consideration while performing the simulation.

Case 3:

image: of design study result

Design study setup:

design variables:

Name	Type	Value	Units
offset distance of stiffener	Range with Step	Min:250 Max:1750 Step:250	mm
height of stiffener	Range with Step	Min:25 Max:100 Step:25	mm

here I also take the height of stiffener in the consideration.

Constraints:

Sensor name	Condition	Bounds	Units	Study Name
Buckling Factor of Safety1	is greater than	Min:25.000000		Buckling 1
Dimension1	is greater than	Min:25	mm	-

Goals:

Name	Goal	Properties	Weight	Study name
Buckling Factor of Safety2	Maximize	Buckling Factor of Safety	5	Buckling 1
Dimension2	Minimize	Dimension	5	-

Study Results:

Component name	Units	Current	Initial	Optimal	Scenario1	Scenario2
offset distance of stiffener	mm	1750	1750	1000	250	500
height of stiffener	mm	75	75	75	25	25
Buckling Factor of Safety1		10.983912	10.983912	25.739744	10.435192	11.320395
Dimension1	mm	75	75	75	25	25
Buckling Factor of Safety2		10.983912	10.983912	25.739744	10.435192	11.320395
Dimension2	mm	75	75	75	25	25

Component name	Units	Scenario3	Scenario4	Scenario5	Scenario6	Scenario7
offset distance of stiffener	mm	750	1000	1250	1500	1750
height of stiffener	mm	25	25	25	25	25
Buckling Factor of Safety1		12.069222	12.149834	11.446318	10.476789	9.698215
Dimension1	mm	25	25	25	25	25
Buckling Factor of Safety2		12.069222	12.149834	11.446318	10.476789	9.698215
Dimension2	mm	25	25	25	25	25

Component name	Units	Scenario8	Scenario9	Scenario10	Scenario11	Scenario12
offset distance of stiffener	mm	250	500	750	1000	1250
height of stiffener	mm	50	50	50	50	50
Buckling Factor of Safety1		12.348249	15.545098	19.637335	20.427256	16.416945
Dimension1	mm	50	50	50	50	50
Buckling Factor of Safety2		12.348249	15.545098	19.637335	20.427256	16.416945
Dimension2	mm	50	50	50	50	50

Component name	Units	Scenario13	Scenario14	Scenario15	Scenario16	Scenario17
offset distance of stiffener	mm	1500	1750	250	500	750
height of stiffener	mm	50	50	75	75	75
Buckling Factor of Safety1		12.914187	10.495317	13.593645	17.977613	24.580116
Dimension1	mm	50	50	75	75	75
Buckling Factor of Safety2		12.914187	10.495317	13.593645	17.977613	24.580116
Dimension2	mm	50	50	75	75	75

Component name	Units	Scenario18	Scenario19	Scenario20	Scenario21	Scenario22
offset distance of stiffener	mm	1000	1250	1500	1750	250
height of stiffener	mm	75	75	75	75	100
Buckling Factor of Safety1		25.739744	18.782549	14.072061	10.983912	14.410861
Dimension1	mm	75	75	75	75	100
Buckling Factor of Safety2		25.739744	18.782549	14.072061	10.983912	14.410861
Dimension2	mm	75	75	75	75	100

Component name	Units	Scenario23	Scenario24	Scenario25	Scenario26	Scenario27
offset distance of stiffener	mm	500	750	1000	1250	1500
height of stiffener	mm	100	100	100	100	100
Buckling Factor of Safety1		19.467524	27.592541	28.075993	19.745516	14.559345
Dimension1	mm	100	100	100	100	100
Buckling Factor of Safety2		19.467524	27.592541	28.075993	19.745516	14.559345
Dimension2	mm	100	100	100	100	100

Component name	Units	Scenario28
offset distance of stiffener	mm	1750
height of stiffener	mm	100
Buckling Factor of Safety1		11.215091
Dimension1	mm	100
Buckling Factor of Safety2		11.215091
Dimension2	mm	100

Result:

Case no.	Name	Buckling factor of safety
1	Without stiffener	9.3669
2	With stiffener at 1000 mm height(obtain by basic study)	25.74
3	With stiffener at 1000mm height (obtain by design study)	25.74

Conclusion :

When I added the stiffener into the base its buckling factor of safety is increases from 9.3669 to 25.74, that shows us that if we apply the 25 times more force then it will fail under the operation. ultimately we can say that stiffener is providing the additional strength to the base. and by doing the design study I found the optimistic location for the stiffener it should at the 1000 mm from the top.

I attach .rar file which contains the all SolidWorks study model and photographs.

Finite Element Analysis of buckling phenomena in the cyclone separator stand Using SOLIDWORKS

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