INTRODUCTION TO MESHING
INTRODUCTION TO MESHING
What is meshing?Physical SystemF.E. ModelMeshing is the process used to fill the solid model with nodes and elements, ie, to create the FEA model.
Why do we carryout meshing?
Finite Element method reduces degrees of freedom from infinite to finite with the help of discretization , ie meshing ( nodes and element)Types of ELEMENTS
Element type selection
Geometry size & shapeType of analysis Time
a) 1D ElementOne dimension very large compared to others
Element Shape : line
Additional data from user : rest of the dimension ( i.e. area of cross section)
Element type : Rod , Bar , Pipe , beam
Practical application : Long Shaft , beams , pin joint , connection elements 1D elements .. .
Commonly used elements:Link 1Beam 3Beam 188pipe 16b) 2D ELEMENTTwo of the dimensions are large compared to third
Element Shape : Quad , tria
Additional data required : Thickness
Element Type : Thin shell , plate, plane stress, membrane
Practical Application : Sheet metal parts , Plastic components2D elements . . .
Commonly Used Elements :Quad 4 node 42Quad 8 node 82Elastic 4 node 63Elastic 8 node 93
2D elements . . .
c) 3D ELEMENTAll dimensions are comparable
Element Shape : tetra , penta , hex , pyramyd
Additional data required : none
Element Type : solid
Practical Application : casing, engine block, crankshaft etc3D elements . . .Commonly Used Elements :Brick 8 node 85Brick 20 node 95
Types of MeshingFREE MESH
No restrictions in terms of element shapeHas no specified pattern
MAPPED MESH
Element shape restricted Area contains quad and tria onlyVolume mesh contain s hexahedronWill be in specific pattern
How to start MeshingStudy geometrySymmetry check
Accuracy Required/Time allotted
Steps in MeshingSet the element attributesSet mesh controlMeshing the model