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AIM : To Perform a batch meshing on the given models with given element criteria with assigning the non linearity material property which is steel. Using Radioss user profile for assigning the material properties. OBJECTIVES : 1) Create a new element criteria file…
Muhammed khader Hussain J
updated on 23 Dec 2020
AIM :
To Perform a batch meshing on the given models with given element criteria with assigning the non linearity material property which is steel. Using Radioss user profile for assigning the material properties.
OBJECTIVES :
1) Create a new element criteria file as per given in the challenge.
2) Perform batch meshing on a given Hood as well as Fender model with given element criteria.
3) Assigning the material and properties to the component.
CAD MODEL IMAGE :
I) HOOD MODEL :
1) Open the Hypermesh software and set the user profile which is RADIOSS. Click the "Import solver deck" option from where tool bar section, then select the "Import geometry" option with followingly choose the file type which is "STEP" because given Hood model is "Step" format. Click the folder option, then choose approprite file which are we gonna perform and finally click the "Import" option to showing the model from graphical Window.
2) Before going to perform batch meshing, make sure delete the solid parts.
3) After deleting the solid part from the hood components, a surface will looks like below image.
Hood Components :
A hood model contains five components which are Latch reinforcement, Two Hinge reinforcement, Inner and Outer part.
i) Inner part :
ii) Outer Part :
iii) Hinge Reinforcement Part :
iv) Latch Reinforcement Part :
II) FENDER :
1) Open the Hypermesh software and set the user profile which is RADIOSS. Click the "Import solver deck" option from where tool bar section, then select the "Import geometry" option with followingly choose the file type which is "IGES" because given Fender model has "iges" format. Click the folder option, then choose appropriate file which are gonna perform and finally click the "Import" option to showing the model from graphical Window.
2) Before going to perform batch meshing, make sure delete the solid parts.
3) After deleting the solid part from fender component, it will looks like below image.
PROCEDURE FOR ATTAINING THE OBJECTIVES :
i) Creating a new element criteria file :
1) Click the "Perferences" option from where menu bar, open the "Criteria Editor setting" and put the appropriate values as per given in the challenge.
2) We don't concern the Jacobian and Chordal deviation criteria, so we manually uncheck that.
3) We have to create new file and saving that particular for using batch meshing.
ii) Perform Batch Meshing :
1) Basically meshing means, we have to discretize the entire model into infinitesimal control volume. This process is called Discritization, that framework is called Meshing.
2) A Batch Meshing means, hypermesh will automatically do geometry cleanup, extract the mid surfaces and meshing also as per given element criteria.
3) We have to perform batch meshing on a each components.
Batch Meshing for Hood Model :
Before going to perform batch meshing, make sure create the duplicate components, because parent component will automatically deleted after perform batch meshing operation.
Inner Component :
Unselect the all components except inner part, click the "Auto Mesh" panel under the "Geometry" main menu panel. We have to choose the batch mesh/QI optimize option, browse the parameter & Criteria file and then import the appropriate file. Select the component surfaces which are gonna perform batch meshing.
It will automatically set the element size which is 5. Click the mesh option, it takes around few minutes to complete the geometry cleanup, extract mid surface and then creating a elements on a surface as per given criteria.
Hypermesh will automatically extract the mid surface by using "Surf offset" extraction method. A parent component is deleted after completion of batch meshing, so by using duplicate parent component for checking the extracted mid surface whether good or bad.
A Extracted midsurface is good and it's capturing properly throughout the component.
Batch meshing will automatically generating the mesh on a surface after completion of automatic geometry cleanup and extracting mid surface. It creates us the mesh elements entire component as per given element criterias.
After done the batch meshing operation, elements are not satisfying our condition. It has created some more trias on it, some few rotational quads are invloved and some opposite trias are also invloved.
This model type mesh is consider, if time has very least.
In this case, elements are almost satisfied the given element criteria except some few elements.
Outer Component :
Unselect the all components except outer part, click the "Auto Mesh" panel under the "Geometry" main menu panel. We have to choose the batch mesh/QI optimize option, browse the parameter & Criteria file and then import the appropriate file. Select the component surfaces which are gonna perform batch meshing.
It will automatically set the element size which is 5. Click the mesh option, it around took few minutes to complete the geometry cleanup, extract mid surface and then creating a elements on a surface as per given element criteria.
First of all, hypermesh automatically cleanup the parent geometry, then it will extract the midsurface and again once cleanuping the midsurface.
After hypermesh extract middle surface, it will looks like below image. In this case, Extracted mid surface is pretty good.
But when we perform batch meshing, element will fails due to improper cleanuping the geometry. At where hemming portion, it was missed to supress some feature edges.
A Batch meshing is successfully creates mesh elements on a outer component surface as per given element criteria. It should be done automatically after completion of extract midsurface.
A batch meshing has allows to more trias, because it was taken very least time to mesh throughout the entire surface.
A more number of elements are failing due to minimum element length criteria. Because, geometry cleanup wasn't properly done at where hemming portion. Inorder to capture the proper mesh flow around the failing hemming portion, we need cleanuping by manually then only it should be perfect.
A geometry cleanup and meshing timing are very less, so that this kind of error happening.
iii) Hinge Components :
Unselect the all components except two hinge parts, click the "Auto Mesh" panel under the "Geometry" main menu panel. We have to choose the batch mesh/QI optimize option, browse the parameter & Criteria file and then import the appropriate file. Select the component surfaces which are gonna perform batch meshing.
It will automatically set the element size which is 5. Click the mesh option, it takes around few minutes to complete the geometry cleanup, extract mid surface and then creating a elements on a surface as per given criteria.
Hypermesh will automatically extract the midsurface after completion of automatic geometry cleanup on it. After creating the mid surface, it will looks like below snap.
Subsequently, batch meshing will generating the meshing elements as per given element criteria on it after completion of mid surface extraction.
But, batch meshing allows some trias element, it will not desirable. But, it acceptable.
It creates a elements within the given element criteria range. So, that element couldn't be failing due to any one of the element criteria parameters.
iv) Latch Component :
Unselect the all components except Latch reinforcement part, click the "Auto Mesh" panel under the "Geometry" main menu panel. We have to choose the batch mesh/QI optimize option, browse the parameter & Criteria file and then import the appropriate file. Select the component surfaces which are gonna perform batch meshing.
It will automatically set the element size which is 5. Click the mesh option, it took few minutes to complete the geometry cleanup, extract mid surface and then creating a elements on a surface as per given criteria.
A Hypermesh was automatically generate the mid surface for latch reinforcement component after click the mesh option.
Extracted midsurface has good, it used surf offset option to capturing the entire component and also automatically perform geometry cleanup on the entire middle surface.
After completion of mid surface creation by batch meshing, subsequently gonna perform automatic meshing operation on it by hypermesh itself as per given element criteria.
A automated mesh elements are satisfied the all element quality parameters except one minimum angle tria. A elements are generated as per given element quality criteria.
Batch Meshing for Fender Model :
Duplicate the parent component for performing the batch meshing, because after completion of batch meshing operation then a parent component will automatically deleted.
Go to the "Auto Mesh" option under which "Geometry" main menu panel, select the "Batchmesh/QI Optimize" and importing the files which are Parameter and Criteria file as well. Select the component surfaces which are gonna perform batch meshing and then finally, click the mesh option for which perform batch meshing operation.
After click the mesh option, first it starts to cleanup the parent component, followingly generate the mid surface from which parent component, again perform cleanup operation on a middle surface and finally generate the mesh elements on a surface as per given element quality criteria.
Hyper mesh has created the middle surface by using surf offset method, after generating the middle surface then parent component will be deleted automatically.
Subsequently, a batch meshing will perform meshing operation on it after completion of middle surface creation as per given element criteria. In this case, lot's of trias are involved to the mesh, it's not desirable. Because, batch meshing operation had held within the less time only.
Also, some of the elements are not satisfying in the given element criteria.
iii) Assigning the Material and Properties :
After perform batch meshing operation on a component, we have to assigning the material and properties as well.
Creating a Material Card :
A material card is same for both Hood model & Fender model as well. We have create a non linear material property for steel.
First of all, we need to create a new material collector by Right click on the mouse from where tab menu bar. After creating an new material card, we have to provide the mechanical properties to that steel material such as Density, Young Modulus, Poission's Ratio, Yield Stress, Hardening Parameter, Hardening exponent and then Maximum Stress.
Assigning to Hood Model :
Creating and assigning a Properties to Inner and Outer Component :
Creating a new two property card from where right click on a tab menu bar and then name it as depends on thickness of the component. Provide the parameters as per default radioss user profile.
Select the mid surface component which are inner and outer part, right click on a component and select the assign option. Then, Select the appropriate Property and material as well which depends on thickness of the component. In this case, component thickness is 0.75 mm thoughout the entire component.
After assigning the material and property to the component. For thickness checking purpose, we have change the "2D Tranditional element representation to 2D Detailed element representation".
A Element thickness is assigned throughout the entire component itself is proper.
Creating and Assigning a Properties to Latch and Hinges Component :
Creating the second property card which is "Property_1.20" because thickness of the parent component which is 1.20 mm and followingly keep the main parameter as per radioss user profile.
Select the mid surface component of two hinge and latch part, right click on a component and select the assign option. Then, Select the appropriate Property and material as well which depends on thickness of the component. In this case, component thickness is 1.20 mm throughout the entire component.
After assigning the material and property card to the component. For thickness checking purpose, we have change the "2D Tranditional element representation to 2D Detailed element representation".
A Element thickness is assign thoughtout the entire component itself is proper.
Assigning to Fender Model :
Creating and assigning the Properties to component :
Creating a new property card from where right click on a tab menu bar and then name it as "Property_0.75" because cross sectional thickness is 0.75 mm. Provide the main parameters as per radioss user profile.
Select the fender midsurface component, followingly right click on it and then select the assign option. Choose the appropriate property card & material card and then apply on it. A property card which is "Property_0.75" and Material card which is Steel.
After assigning the material and property card to the component. For thickness checking purpose, we have change the "2D Tranditional element representation to 2D Detailed element representation".
A Element thickness is assign thoughtout the entire component itself is proper.
FINAL MODEL IMAGE :
Successfully performed batch meshing operation and then assigned the material & property card as well to the given models.
Hood Model :
Fender Model :
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