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2010
Joe Galliera

Material tests

Posted by Joe Galliera Employee Mar 8, 2010
Last week, I had a healthy conversation with a customer and VAR AE regarding testing methods to determine the mechanical properties for different material models used in SolidWorks Simulation.  The customer had an Instron machine for doing testing, although many customers would not have this testing equipment readily available to them.  Even if you do not have to perform these tests yourself, it may be important to understand how they are done.

I found a few websites that can help out in understanding the different tests that are done for material characterizations:

From Axel Physical  Testing services site: http://www.axelproducts.com/ The links under the heading "Testing Services" are really good.  Also you can download PDFs with more details of testing different materials from the links below the heading "Technical Downloads" (or from http://www.axelproducts.com/pages/downloads.html#p1).

Datapoint Labs offers various TestPaks specifically for SolidWorks Simulation material models at: http://www.datapointlabs.com/ShowDetails.asp?CAEPackId=40&MfrId=31

The previously mentioned customer conversation was specifically about defining Mooney-Rivlin constants for hyperelastic materials. In the Knowledge Base on the Customer Portal, there is an  article number that provides details about how to calculate the Mooney-Rivlin constants with the SolidWorks Simulation Nonlinear bundle and also gives an example problem.  The Solution ID number is S-034890.

Copyright © 2010 Dassault Systèmes  SolidWorks Corp. All rights reserved.
Do not distribute or reproduce without  the written consent of Dassault Systèmes SolidWorks Corp.

If you always wanted to know how to enter special  symbols, like 5.0±0.1 or or  176°F or µm, it's really very easy.  You have  to hold in the Alt key and use the number keypad to type in digits that  correspond to the special ASCII codes.  You can use this link as a reference: [HTML format] http://bit.ly/diuZcF , or [PDF] http://bit.ly/aPGo4q

 

Copyright © 2010 Dassault Systèmes SolidWorks Corp. All rights  reserved.
Do not distribute or reproduce without the written consent of  Dassault Systèmes SolidWorks Corp.

Ever wish that you could easily read numbers off a plot, well there is a freeware solution out there for just this reason: Plot Digitizer.  I really like the  Zoom feature so that I can easily pinpoint my selections!

Download the  program from: http://www.usouthal.edu/physics/software/plotdigitizer.htm.   No need to install, it comes as an executable and includes a help file, info on  how it works and a sample JPEG image of a plot to try it out.  First, calibrate  by selecting any 3 points (manually typing in the plot location for each point),  and then click on the data points using the zoom preview to get it right on the  spot, and automatically it creates a nice spreadsheet of all your points which  you can save out to many formats including Excel.  Remember that  SolidWorks Simulation can read in a text file for material properties  and load time curves, so this can be very handy for those purposes.

Here are the features from the website:

Plot Digitizer: Plot Digitizer is a useful program for extracting  data from a linear, semi-log, or log-log plot.
Using an optical scanner, create a Bitmap or JPEG  image of the plot  and open the image file in Plot Digitizer.  Then, after calibration, you can  extract the data values by merely clicking on the data points.

Features
    * A zoom window aides you in clicking on precisely  the point you are interested in.
    * Automatically corrects for the  rotation of the image you're analyzing as well as the non-orthogonality of the  axes.
    * Any 3 non-collinear points can be used for calibration.  (Calibration points do not need to be on the axes.)
    * Save your progress  at any time in a "project" file.
    * Label the calibration points you have  selected. (Labels can be toggled on and off.)
    * Label the points you're  digitizing on the calibrated image. (Labels can be toggled on and off.)
    *  Export the calibrated image (showing the point labels) to a bmp or jpeg  file.
    * Export data to an ASCII, an MS Excel or an MS Word  file

Copyright © 2010 Dassault Systèmes SolidWorks Corp. All rights  reserved.
Do not distribute or reproduce without the written consent of  Dassault Systèmes SolidWorks Corp.