How to add contact interaction in ABAQUS.

When we deal with multi-parts analysis, interaction between parts’ surfaces can greatly affect the simulation results. This example here I use is a shell model of a spring arc and two boards, when we pull the upper board upwards, the spring and board will touch each other and participate the stress distribute condition on the spring arc.

This is a compare of with & without contact interaction between board and spring. We can see not only distribution, the stress amplitude is changing.

This is an easy problem to notice since the spring are penetrating all through the board, and it’s actually also easy to deal with it, Just add an interaction between two parts, surface to surface contact is enough for my example, however you may choose the contact which fit your condition.

The surface to surface tools will let you choose the master surface (by angle is good to use if the surfaces is flat), then choose a contact surface for the master surface.

Then do the same with slave surface, make sure this pair of surface have the right contact surface.

In this problem we don’t need any adjustment on initial surface distance, however if you are calculating a orb touch another orb, it’s nice to “adjust only to remove overclosure”.

Contact interaction property is necessary for the process, but it’s easy for general material, in this problem, we could use default sets, which is “frictionless” and “hard contact” for tangential and normal behavior. If shell elements are used, you should set the geometric properties here to add thickness between master and slave part since the ABAQUS will not automatically use your thickness property in this section.

“you can specify an out-of-plane surface thickness for two-dimensional models or a cross-sectional area for every node on a node-based surface. Enter this value in the Out-of-plane surface thickness or cross-sectional area (Standard) field.If you are performing an Explicit analysis, you can specify the thickness of an interfacial layer between the two interacting surfaces. using Thickness of interfacial layer (Explicit), and enter the thickness.” — Said the ABAQUS help file.

After click the OK button, a simple interaction is set for more reasonable and accurate calculation. Enjoy.

 

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