mesh for fracture mechanics problems

[d3s]

I need to mesh a simple plate for a fracture mechanic problems ,i see other quote about quadrilaterals in circle with this attachment
http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20061219/fb752c4d/attachment.png; how can i contruct something like
this ,like a radial mesh in the bottom of the example?

[escolano]

Sorry, your image link is not available.

You can mesh for example a circle with ‘structured centered’ pattern (triangles only), or divide the surface in five surfaces of 4 sides that could be meshed structured, or could mesh with unstructured elements