Week 6-Meshing of Hood Challenge

AIM : GEREATING MID SURFACE AND GEOMETRY CLEANUP OF GIVEN COMPONENT

PROCEDURE : By given component , we have to extract the midsurface and geometry cleanup

• Firstly import of model
• Then , go to option of midsurface(automidsurface-autoexcation option-skin offset selected) and then exact the mid surface

Geometry cleanup :

• View midsurface and correct errors using the midsurface edits options such like of Geometry :(Quik Edit)
• Importing the geometry component
• Generating midsurface
• Simplifying geometry
• Refining topology to achieve a quality mesh

THE GIVEN COMPONENT OF GEOMERTY :

• GIVEN MODEL BEFORE GEOMERTY :
• INNER EXACT BOBY :

• OUTER EXACT BODY :
  
• HINGE REINFORCEMENT EXACT BODY 1 :

• HINGE REINFORCEMENT EXACT BODY 2

• LATCH REINFORCEMENT EXACT BODY :

• MID SURFACE OF EACH COMPONENT AFTER GENERATING MID SURFACES WITH AUTO MID SURFACE AND GEOMETRY CLEAN UP :
• THE MID SURFACE OF INNER EXTRACT BODY

• THE MID SURFACE OF OUTER EXACT BODY :

• THE MID SURFACE OF HINGE REINFORCEMENT EXACT BODY 1 :

• THE MID SURFACE OF HINGE REINFORCEMENT EXACT BOBY 2 :

• THE MID SURFACE OF LATCH REINFORCEMENT EXACT BODY :
  

• GENERATING MESH EACH COMPONENT :
• But given of the dimensional value in question :

• BY given of above values to meshing the components
• After completing of mid surface exact ,then we go from the mesh the component
• 2D-automesh optionselested-then we go from while surf/elements option of doing the mesh
• shortcut key f12 (mesh)
• And selected of mesh type options
• MESH COMPONENT OF INNER EXCAT BODY
  

• MESH COMPONENT OF OUTER EXACT BODY

• MESH COMPONENT OF HINGE REINFORCEMENT EXACT BODY 1

• MESH COMPONENT OF HINGE REINFORCEMENT EXACT BODY 2

• MESH COMPONENT OF LATCH REINFORCEMENT EXACT BODY

• THE MODEL SHOULD PASS ALL GEOMETRY ELEMENT QUALITY BY GIVEN OF ALL DIMENSIONAL VALUES
• BY the given of parameters values in hyper mesh
• Then go with above of display screen option- preference selected-criteria file setting option
• The option shows the failure of elements in the spot of doing the mesh
• 

• While another option of better of optimization elements (QUALITY INDEX)
• select geometry 2D-quality index
• There are several option are held

• After completing of mesh flow then go further nodes conductive of each nodes to nodes
• If further failer of nodes conductive ,selected of option to reduces the problem
• 2D-replace option selected
• And completely the mesh model then go with nodes equivalence or not , find edges
• shortcut key f3 from replace the nodes
• shift +f3, shows of finds edges
• 

• shift +f3, shows of finds edges

• THe below of image showing find edges and replacing them nodes conductive

THICKNESS ASSIGN :

A property card is created to assign the thickness of the material

IMPORTANCE :

• WARPAGE :

Warpage is the deformation thatr occurs when there is uneven shrinkage in the different parts of the molded component.warpage occurs when there are variations of internal stresses in the material.warped part may not be functional or visually acceptable

• ROTATIONAL :

> Rotational quards are the elements that are avoided in the analysis like crash,drop and impact where the flow of energy

>This why the rotating quad elements are avoided in the model as they distract or divert the flow of the energy in the model

>when the energy flow is distracted with the rotating quards than the actual physics of the problem(energy flow) is being modeled wrongly and as a results,the simulational is aslo not accurted.

• TOPOLOGY :
• Topology repairs consist of correcting connectivity errors between adjacent surfaces
• Possible error include unconnected adjacent surface,duplicted surface ,missing surface
• The goal of topology repairs is restored surface data to a perfectly clean representation of the part

• TOLERANCE :
• The tolerance is the difference between the maximum limit of size and the minimum limit of size
• ELEMENT QUALITY : The element options is shows the failure elements , while doing the mesh

• SKWENESS ;
• Skweness is the angular measure of element quality with respect to angles ideal element type. it is one of primary qualities measure of FE mesh.
• Skweness determine how to close ideal (equliateral or equi-angular)
• ASPECT RATIO :
• Aspect ratio is measure of a mesh elements derivations from having all sides of equally length
• A high aspect ratio occurs with long ,thin elements
• TO REDUCES THE MAX AND MIN QUAD ANGLE :
• By using the triangle formule are
• The less than 90 degree triangle is known as “ACUTE TRIANGLE”
• The more than 90 degree triangle is known as “OBUSTE TRIANGLE”

• FEATURED LINES : Any line which helps or directly involves defining a feature is said to be a feature line . a line that is represented for a plane change is a well called a feature line
• CONSTRUCTION LINE : any line which does not involve indefining the feature is said to be construction line

WHY IS GEOMETRY CLEAN UP : The geometry cleanup option allows you to 'cleanup' the model geometry by marking vertices which are very close to each other into a single vertex according to a definable spacing excitation

• SPLIT:

In case of such an indefinitely nodes shape we can use of help split option of dividing the line in between element node

Splint element in hypermesh:

From the edit element, we can use the split tool, to split edges/quads, combine trias and swap edges ,

Edit element split tool keyboard short cuts and mouse control

To do this press Button

Split element or edge Left-click

Combine elements Shift+left click

Swap element edge Ctrl+left-click

Exit tool ESC or right-click

BEFORE SPILT AFTER SPLIT

• TRIA ELEMENT :

A tria element is stiffer than quad elements .Because, A tria element will always in a plane because it take minimum of 3 nodes to specify the plane. A quad element can wrap if required depending on the applied force.

Triangular finite elements are stiffer in bendending problems because they have constant strain across the elements, this simply makes it impossible for an FE solver to calculate the bending response properly ,unless a lot of tria elements are used

• When comes to tria elements ,there are few thumb rules to be followed
• No tria elements should be opposite to each other
• No tria elements should be connected back to back
• No tria elements should be on the edges of the geometry
• No tria elements should be near on the holes
• No tria elements should be on the feature and the fillet
• Finally, there should be less concentration
• UNDERSTOOD LOGIC OF THIS WEEK CHALLENGE :
• How to exact the mid surface and geometry clean up
• how to do proper mesh flow
• Nodes to nodes conductive with out failures
• while doing of mesh without failures of elements such like , warpage, minimum size, maximum size,guard angle, skew
• Find out of edges
• understand of features lines and construction lines differences between them

• CONCLUSION:
• Finally, we generated midsurface and geometry clean up
• And indivusal each component is done of mesh
• Finally we checked element quality of given values of models with out failures of geometry