Bi-Material Interface Opening Strain Energy/Displacement

  • Last Post 09 April 2019
chmaricle posted this 07 December 2018

Hello, I'm attempting to simulate a steel pressure vessel with a notched defect and composite wrap repair. See the picture below.

I've meshed the assembly in using hex elements with shared topology between the parts. See the mesh below.

I'm trying to get the opening strain energy between the two materials at the notch interface. Basically, I'd like to see if there's a way to simulate the repair separating from the pressure vessel at this notched area. See below.

Right now, since the mesh has shared topology, I suspect there's only one node where the meshes of the two parts meet, which means they won't separate at all and will strain together no matter how much load is put in. Any thoughts on how to best simulate this problem are much appreciated!


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apwang posted this 15 December 2018

Hi Craig,


You are right that since shared topology, they share same nodes. There's no interface between the two geometry.

To simulation the separation of the two part, you might consider contact debonding.

Please have a look of this ANSYS video

Hope this could be helpful for you.






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chmaricle posted this 03 April 2019

Thank you for the help, April. I'm having some trouble with selecting the interfacing surfaces to make a bonded contact connection. I'm trying to make the contact between the touching surfaces on parts named "Repair_Notched" and "Substrate_Notched". Neither the "Contact" nor "Targets" will allow me to select and apply the surfaces. What would prevent me from being able to select these surfaces? I tried to make a .wbpz file to share but it's 1GB, which I figured was too large.

peteroznewman posted this 03 April 2019

The limit for attachments is 120 MB. Try RMB on Mesh and Clear Generated Data, then save the Project, then make the Archive. Is it smaller?

ANSYS employees, such as April, are not permitted to download attachments and open models. Other members like me can do that, so I will take a look if you succeed in making a smaller archive.  Some people reply with a link to their Google drive, which is what Gmail automatically does for attachments that are too large.

Make sure to mention which version of ANSYS you are using when you reply.

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chmaricle posted this 09 April 2019

Thank you for the help. I saved a copy, cleared out the mesh, and made a new archive and it's 300 kb. I've attached the file. I am using Workbench 17.2.

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