How to conduct analysis on fracture with friction?

Peter Andreas Timotius_21003

I intended to see the displacement of the pink and yellow component.

I intended to apply loading condition like this: the downward (or compressive) loading is represented by RBE3 elements that are connected to all nodes on the upper flat surface. The bottom flat surface is constrained in all 6 DOF.

I want to assume that between the outer and inner cylinder are glued like one body but with different material properties (so I want the light blue and darker blue to be glued, as well as yellow and pink to be glued). I also want to assume that there are friction between the blue-yellow and light blue-pink components, with the friction coefficient of 0.3.

Therefore, I would like to ask, what kind of analysis that I can apply? Besides, how can I define which contact to which components?

I've heard that frictional contact analysis is always nonlinear analysis. But I am sorry I am still not used to know which control cards or contact-related functions in Hyperworks and Hypermesh.

In this model as well, the meshes on the interfaces across all different models are well connected. Would that affect in choosing the analysis? I've seen other solver used node-to-surface or surface-to-surface approximation as part of its contact analysis formula, as their examples show that there are gaps between two contacting parts.

Rishabh Awasthi_20948

Hello 

You can try using the the Auto Contacts tool to determine contact interfaces automatically between your components. This tool will create contact groups with main and secondary contact surfaces defined automatically.  If you wish to introduce friction at the contact interface then I would suggest to first create PCONT property (Model -< Contacts -> Properties). Once the property is created you can add to contact group definition by selecting Property Option as Property Id and select the property created. 

Documentation for auto contact tool  :

https://help.altair.com/hwdesktop/hwx/topics/pre_processing/model_build_and_assembly/auto_contact_create_t.htm?zoom_highlight=contacts

Demos for creating contacts : 

1. https://www.youtube.com/watch?v=F4jkqtIa-w0&amp;ab_channel=AltairHow-To\

2. https://www.youtube.com/watch?v=twqZr2bN02I&amp;ab_channel=AltairHow-To

You can also create contact surfaces manually (Model -> Contacts -> Surfaces )

If there are gaps in between your contact surfaces the Adjust option or SRCHDIS may help. Also if you expect to have large relative motion between contact surfaces then TRACK : FINITE or CONSLI can help as well. These contact option are defined under contact groups.

Does inner and and outer cylinders have matching nodes as well ?