[ANSYS Meshing] Unable to refine mesh around an elliptical crack

halfprof · March 22, 2017, 01:48

Hi there,

This is my first topic and i really want to give thanks to this forum.

I am using Ansys v15 to simulate an external axial elliptical crack in a pipe submitted to internal pressure. The crack is inserted using the fracture meshing "elliptical crack" available in ansys.

As it can be seen from the pictures, the meshing is just fine before inserting the crack. After inserting the crack, the meshing is overwritten and it becomes coarsed around the crack front.

Mesh information: Advanced meshing on Proximity fixed.

I got a warning message that says that the mesh is coarse around the crack so I need to resize it.

Can someone help me with this ?

josejjpc · September 8, 2018, 09:46

hello Halfprof, do you finalize your model? I am doing the same estudy and when the results it is solved I receive a error mensager "A fracture result is specified by time instead of by set. If the time lies between two result sets, no interpolation is performed. Instead, there are two possibilities: (1) if there are no mesh changes, the lower set applies; (2) if there are mesh changes, the closest set applies"

I receive the value 1157,2Mpa.mm^(0,5), but in my calculation should be close to 1608,92 according Abaqus or 1726,55 according API standard.

someone could help me?

semi eliptical external crack dimension (longitudinal direction):
63,2mm major radius
15,8mm minor radius
pipe external radius: 1158,8mm
pipe internal radius: 1139,8mm
pipe lenght: 800mm
Internal pressure: 3.5Mpa

March 22, 2017, 01:48	Unable to refine mesh around an elliptical crack	#1
halfprof New Member Mighouar Join Date: Mar 2017 Posts: 1 Rep Power: 0	Hi there, This is my first topic and i really want to give thanks to this forum. I am using Ansys v15 to simulate an external axial elliptical crack in a pipe submitted to internal pressure. The crack is inserted using the fracture meshing "elliptical crack" available in ansys. As it can be seen from the pictures, the meshing is just fine before inserting the crack. After inserting the crack, the meshing is overwritten and it becomes coarsed around the crack front. Mesh information: Advanced meshing on Proximity fixed. I got a warning message that says that the mesh is coarse around the crack so I need to resize it. Can someone help me with this ?

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September 8, 2018, 09:46		#2
josejjpc New Member José Rodrigues Pereira Corrêa Join Date: Nov 2017 Posts: 4 Rep Power: 8	hello Halfprof, do you finalize your model? I am doing the same estudy and when the results it is solved I receive a error mensager "A fracture result is specified by time instead of by set. If the time lies between two result sets, no interpolation is performed. Instead, there are two possibilities: (1) if there are no mesh changes, the lower set applies; (2) if there are mesh changes, the closest set applies" I receive the value 1157,2Mpa.mm^(0,5), but in my calculation should be close to 1608,92 according Abaqus or 1726,55 according API standard. someone could help me? semi eliptical external crack dimension (longitudinal direction): 63,2mm major radius 15,8mm minor radius pipe external radius: 1158,8mm pipe internal radius: 1139,8mm pipe lenght: 800mm Internal pressure: 3.5Mpa