Week 4- Challenge
Objective : To create midsurface, generate mesh of mixed type element, creating 1D elements as per given instructions.
CAD model Image:
Procedure:
1) Import IGES file
File – Import – geometry – parallel bracket.igs – import
As we have to generate mid surface of two brackets. We don’t require lines.
This lines can give problem while generating mesh or while solving problems. So deleting the extra lines from geometry.
2) Deleting extra lines.
Delete – Lines – select – delete.
3) Generating Midsurface of top and bottom brackets:
Geometry – mid surface – auto mesh – closed solid – extract
4) Removing extra surface which we don’t require.
Right click on parallel bracket body 1 – delete
Same for parallel barcket body 0
5) Creating Washer split over a surface
Geometry – quick edit – washer split – lines – offset value as 5
6) Asociate mid surface to different component.
Right click on component – create - name it as Bracket top
Same procedure for bracket bottom.
Tools – organize – collector – surfs as bracket top - move
7) Generate mesh using mixed type element and element size as 10
2D – automesh – element size – 10 – mesh
To create good mesh over a surface we have to increase or decrease the element density at fillets also create equal
number of nodes at washer surface to get good quad element.
Increasing node density at edges to capture whole surface.
8) Connecting all nodes by using rbe2 or rbe3 elements as per given instructions
9) Creating cross sections as per given data.
A) 1D – Hyperbeam - standard Section – hypermesh - box
B) 1D – Hyperbeam - standard Section – hypermesh – I section.
C) 1D – Hyperbeam - standard Section – Optistruct – CROSS Section.
10) Create components for rod, bar, beam, spring and mass elements.
Right click component – create – name
11) Create material for selected items.
Material – MAT 1 - define E, G , Nu and density.
12) Create properties for given rod , bar, beam , spring and mass
Enter element types as following
Rod – PROD, Bar – PBAR, Beam – PBEAM, spring – HM_ELAS, Mass - PMASS.
13) Alocate cross sections for individual properties
A) Rod – cross section – box
B) Bar – cross section – I Section
C) Beam – cross section – cross section
14) Associate properties to its respective components
Component – properties – rod
15) Generate rod, bar and beam element between two brackets.
a) 1D – rod – PROD – create
b) 1D – bar –PBAR – create
c) 1D – beam - PBEAM – create
d,e) 1D – mass – PMASS – create
Results: Sucessfully generated 1D elements between two brackets.
Final model