# How to create transverse cracked in a composite material using ANSYS or ABAQUES ?

Actually my research area is fault diagnosis of beams. So I want test the modal analysis of cracked composite beam. So, how can I create crack over composite beams?

Question

Actually my research area is fault diagnosis of beams. So I want test the modal analysis of cracked composite beam. So, how can I create crack over composite beams?

- Dear Ranjan

Try using XFEM in abaqus, it is very useful for crack analysis and discontinuous problems

best regards - Hi Ranjan

I think I have done the similar problem like what you have stated. Herewith I've attached ppt which contains exercise problem done for isotropic material but concept same for composite also.Try it out..... - You need to partition the face of the model first and draw a line at the center of the plate. Usually crack is modeled as a seam, if crack surfaces in the unloaded state lie next to one another with no gap. The mesh should has a seam along the crack with duplicate nodes, which allow the crack to open when loaded.
- Dear Bo Liu

give me any problem how to solve... - Cohesive zone modelling approach in Abaqus or Ansys can be used to model crack initiation and propagation. You will need normal and shear strengths for the crack initiation and fracture toughness values in Mode I and II for crack propagation. The crack path should be pre-defined and then meshed with cohesive zone elements either in 3D or 2D formulation such COH3D8 or COH2D4 depending on your modelling approach. You can find further details in the Help and Tutorials of Abaqus regrading cohesive zone elements..
- Thank you Himayat

I will try in Ansys....

If any doubt arises , then I will ask again.. - You should try Ansys cohesive zone model for crack propagation. THere are 2 ways.The first one is to create a solid mesh and put cohesive elements (inter) between the elements with zero thickness. This can be used when you already know where the crack is going to propagate. The second one is to create a mesh with solid elements and then with the emodif convert them to cohesive elements.This can be used in the case you don't know where the crack is going to propagate. Hope it works in your case. Watch out about the exponential or bi-linear behavior of the c.elements

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