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Houston, We Have Contact! - Managing Contacts in SOLIDWORKS Simulation

Vince Farrell

By Paolo Olmos

Managing contacts is something that comes up constantly when working on customer projects in SOLIDWORKS Simulation. I recently had a project that involved a large and complex assembly with numerous contacts to be defined. There were three things I was concerned about when trying to plan, setup, and review contacts in the analysis:

  • Where contact will have to be defined manually between faces and components
  • What type of contact is used and which faces/components were selected
  • To make sure that a no penetration contact was defined between the correct components

There were three tools and plots in SOLIDWORKS and SOLIDWORKS Simulation that I used to visualize and check the contacts in my analysis: Interference Detection, Contact Visualization Plot, and Contact Pressure Plots. Let’s take a brief look at how each of these work.

Interference Detection

In SOLIDWORKS Simulation, the global component contact will automatically apply the specified contact condition to all faces that are initially touching. To help see which faces will be used, there is a tool within SOLIDWORKS called Interference Detection. To use it, start by going to Tools > Interference Detection. This is where you can enable the option to “Treat coincidence as interference”.

contact

Under the results section, there will be a list of all the initially touching faces. Clicking on a result will highlight the touching faces in red as in the screenshot below. Don’t forget to enable the options to “Show ignored interferences” and “Include multibody part interferences”.

contact

The Interference Detection Results Show Coincident Faces Highlighted in Red

Bonus Tip: This tool is also one of the four tools I use before running my analysis. As the name suggest, interference between components can be found by not enabling the “Treat coincidence as interference” option. Removing interferences will help prevent problems when trying to mesh and solve an analysis.

Contact Visualization Plot

Starting with SOLIDWORKS Simulation 2014, visualization plots can be created to help visualize the type of contact and the faces/components that are used. To create a contact visualization plot, right-click the Connections folder in the Simulation tree and choose “Contact Visualization Plot”.

contacts

After clicking Calculate, the results section will show all the contacts that have been defined along with, whether it is a global contact or contact set and the type of contact. Selecting an item in the results will use a particular color, based on the type of contact that is defined, to highlight the face in the graphics area. Below is a table of the types of contact and associated colors that are used:  

Contact Type Color Rendering

Bonded

Red

No Penetration

Purple

Allow Penetration (Free Contact)

Green

Shrink Fit

Orange

Virtual Wall

Yellow

Thermal Contact Resistance

Purple

Insulated

Green

Contact Visualization Results Highlight Contacting Faces Based On Type

Contact Pressure Plots

In SOLIDWORKS Simulation, a useful plot to help see if there is a no penetration contact defined between components is a contact pressure plot. Contact pressure is the result of two bodies coming into contact during an analysis with a no penetration contact defined between them. To create a contact pressure plot, define a Stress Plot by right-clicking the Results folder from the Simulation tree.

contacts

The plot that is generated can either be a vector plot that shows contact pressure between all components or a color plot that shows contact pressure between selected components. Starting with SOLIDWORKS Simulation 2014, contact pressure plots can also be created in a 2D simplification analysis.

Contacts

Contact Pressure Result Shown As A Vector Plot Between Faces With No Penetration Contact

Hopefully these tools can help you setup contacts more quickly and efficiently. To learn more about these features and tools, I encourage you to look at the SOLIDWORKS and SOLIDWORKS Simulation Help. Also, if you have your own tips and tricks for handling contact in an analysis, please share them in the comments section below.

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