## General Mechanical

#### Create surface body for generating arbitrary crack

• Divya Giri
Subscriber

Hello and good evening!

I need to generate a 3D crack into a bamboo model with an arbitrary crack method. But I couldn't figure out how to create a surface body into the existing model to define an arbitrary crack.

I would appreciate it if someone could help me.

Regards,

Divya Giri

Ansys Employee

Hi Divya,
In ANSYS Mechanical, there are three options for modeling a crack.You can choose among a semi-elliptical, arbitrary, or pre-meshed crack depending on your needs.
A Suface Body created in Geometry Modelling Application is used to represent Arbitrary Crack. The exterior edges of the Surface Body define the crack front and the Sruface itself represents the discontinuous crack plane. Create a Surface in CAD that will be a Construction Geometry in Mechanical. The crack will be the intersection between the body geometry and the construction geometry. Once in Mechanical, select the behavior of the surface as a Construction body.

For more information about defining Arbitrary Crack, pleaser refer to the following Ansys Help Document:
Defining an Arbitrary Crack (ansys.com)

Regards,

• Divya Giri
Subscriber

Hi Vinayak,

Thank you for explaining that. I need to generate a 3D crack( with some length, depth, and thickness) into a model and simulate the model to compression and buckling in the presence of that crack. So, I assume the arbitrary crack method would help me get that.

I also went through the Ansys help document but it hasn't mentioned how can I create another surface body. Could you please elaborate more on what you said 'Create a Surface in CAD that will be a Construction Geometry in Mechanical'? That would be really helpful.

Thank you in advance.

Best Regards,

Divya Giri

Ansys Employee

The surface ie crack geometry can be planar or non-planar. You can create this surface in one of the upstream CAD applications such as Discovery or SpaceClaim.

For more information on how to create Surface Bodies, please refer to the following link:
Surface Bodies (ansys.com)

Thanks,
Vinayak

• Divya Giri
Subscriber

Hi Vinayak,

It definitely did. Thank you so much :)

Best Regards,

Divya