Hi Everyone,
Rules Based Mesher (RBM) has the option to “ignore internal cracks” in the geometry tab of the editor box. The criteria to decide if a hole is a crack depends on two factors, Normalized Shape Factor (F) and Hole Surface Test compared to Mesh Size (S).
1. F < 0.18, where F= 4*Pi*(Surface area of crack)/(Perimeter of crack^2) -> The hole is treated as a crack
2. If F > 0.18, an additional test for S is performed
S < 0.005*(Mesh size^2) -> hole is treated as a crack.
For example, for a given crack size, RBM ignores the crack for a mesh size of 2mm, as shown in the table below.
|
Mesh Size |
Crack length |
Crack width |
F |
Result |
S |
Final result |
|
2 |
0.3 |
0.1 |
2.356194 |
not crack |
0.02 |
Not crack |
|
3 |
0.3 |
0.1 |
2.356194 |
not crack |
0.045 |
crack |
Thanks,
Preeti
