SolidWorks Simulation- Mesh Controls , SolidWorks Simulation- Mesh Controls

SolidWorks Simulation- Shell Symmetry Fixture SolidWorks Simulation- Shell Symmetry Fixture

SolidWorks Simulation- Advanced Restraints , SolidWorks Simulation- Advanced Restraints

SolidWorks Simulation- Easy Results Plot Editing SolidWorks Simulation- Easy Results Plot Editing

SolidWorks Simulation- Flow Simulation Lids Video , SolidWorks Simulation- Flow Simulation Lids Video

SolidWorks Simulation- Automatic Mixed Mesh , SolidWorks Simulation- Automatic Mixed Mesh

SolidWorks SimulationXpress…it’s FREE! Use it!
(there’s a complimentary bonus link at the end)

What can SimulationXpress do?

1. Part analysis
2. Stress analysis
3. Optimization analysis with one variable and criterion
4. Analysis management using Simulation study tree
5. Isotropic materials
6. Uniform pressure and force on faces
7. Fixed restraints on faces
8. Stress contour plot-equivalent (von Mises) stress
9. Deformation plot
10. Factor of safety calculation and plot
11. Generate reports
12. Publish SolidWorks eDrawings of analysis results
13. Animate and save as AVI

Compress it…

Bend it…

Twist it…

Evaluate Factor of Safety…

Optimize it…

You have created a Simulation study of a fairly large assembly.  It has a mixed mesh – Solid elements, also Shell elements, maybe also some Beams.  You are relying on the GLOBAL CONTACT – BONDED to tie together all the mesh bodies of similar type.  You spent maybe 40 minutes, at least, creating the BONDED contact conditions to tie the dissimilar mesh elements together.
 And now when you try to run the study, you get the failure message, “Zero or indefinite stiffness matrix”.
 Ugh.  That means that at least one component is not correctly bonding to a neighbor, and so is free-floating.  But which one?  Since the study won’t run, you can’t display the displacement plot, and see which part(s) are flying off the screen.  How to diagnose this – without wasting the entire morning?  There are two ways I approach solving the problem, and they both use the study Property option, “Use Soft Springs to Stabilize the Model”.
1:  Moving
Sometimes you can simply turn ‘soft springs’ on, and run the study again.  About half the time, I find that the study will now run, (and produce a warning message, that very large displacements were detected).  Tell it to continue running the study anyway, as-is, without turning on the large-displacement flag.  Then, when you plot the Displacement results, you might very well be looking at an empty screen, or you might see that one (or more) parts seem to be missing from the plot.  They are not missing – they simply went flying off the screen.  Set your Displacement scale factor to be wicked small, (think many leading zeros), and then animate the displacement plot – and you’ll see at the start of the animation, which parts are un-tethered, and in which directions they are free to wander.
A cool and easy trick.  Except that, I did say above, I use this trick “about half the time”.  Because the other half of the time, the applied loads might act directly on the under-restrained parts, in the same direction that they are free to move, and then the “Soft Springs” do not supply enough stabilization.  What to do then?
2:  Shaking
The second approach is to Shake the assembly, instead of moving it.  Create a new Modal Study, (this will require the Simulation license to be Simulation Professional or higher).  Set the Modal Study Properties to only ask for the lowest 2 mode-shapes, or maybe 3, but no more.  (this is a diagnosis, not a true study, so you want it to run fast).  Then you copy all your Restraints and Bonded conditions into the new study.
Wait – I did NOT say to re-create all your Restraints and Bonded contacts.  I  said “COPY” them.  This is a “tip within the tip”.  A lot of people I encounter still don’t know you can do this.  If you activate your first, “real” study, you can then select the folder for your Restraints, and DRAG that folder down to the row of tabs at the bottom of your screen, and DROP it into your new Modal study.  Done.  So creating this Modal study to diagnose your problem should take, like, 30 seconds tops.   You do NOT have to copy over your system of loads – just the restraints and bonding, because we are not going to ‘push’ your assembly in any particular direction, we are instead going to vibrate it in-place.
But, you DO still have to turn on the “Soft Springs” option to stabilize the model.
Ok, now you RUN the Modal study.   Because the underlying equations of the Modal study are being solved differently than a Static study, the problem will generally solve O.K. even with under-supported parts.  And, when you activate the plot for the lowest 2 or 3 mode-shapes, each one should show you some rigid-body motion, (and remember, it could also be a rotation!), of the part or parts that are un-tethered.   Animate the model-shape plot, and it will be patently obvious which parts are walking away, and in which directions.
Important caveat: The Modal Analysis method of diagnosing your problem, will NOT allow you to create sliding or intermittent Contact via the “No Penetration” gap elements.  If your problem also has that kind of Contact in it, you need to either ignore that contact for the purpose of diagnosis, (which will too sloppy, and you’ll have to ask for more Mode Shapes –  ignore the responses you know are not ‘real’);   Or, you could replace the Bonded contact, with either an Elastic Support, or a Spring Connector.  With either of these, make the Normal spring stiffness pretty high, but the tangential spring stiffness very low – and you WILL have over-supported the selected faces a little bit.  But again, you’re just looking for which parts want to walk away, not running the ‘real’ study yet, so we can throw a few darts.  And if the problem produces NO rigid-body modes when you’ve replaced the Gap elements with springs, then you know for sure that the Contact conditions are the real problem.
One of these two methods should solve the “Zero or Indefinite Matrix” problem for you, just about all the time.

Shell Edge to Beam Bonding

The bonding of shell edges that belong to surface or sheet metal bodies to beams, commonly used to simulate gusset plates connecting beams, is supported through manual contact set definitions.

Render Shell Thickness

Reaction Forces for Beams

A recent sales promotion has helped many new customers obtain a license of SolidWorks Premium, which includes lots of great Add-in functionality beyond SolidWorks Standard and SolidWorks Professional. Perhaps the most popular is SolidWorks Simulation, which provides full finite element analysis (FEA) capabilities for linear static (“stress/strain”) simulation. Also, those of you on a “floating” Network License may have access to a Simulation license. But many of you might not know how or where to get started with Simulation.
Where are the SolidWorks Tutorials? Where is the Help?
Well, Step 0 is you need to make sure SolidWorks Premium is installed! If it is not, then you won’t be able to do Step 1. If you need help installing (or modifying your current installation), then contact your CAD Administrator, or CAPINC customers on subscription can of course contact our Technical Support staff.
Step 1:  Turn on the “SolidWorks Simulation” Add-in. Launch SolidWorks and navigate to the Tools > Add-Ins… menu:


Check the left-hand box to turn on Simulation in this session. Checking the right-hand box will turn it on in every session from now on, which if you’re using a Network License may anger your coworkers who might want access to the license that you’ll keep grabbing!
Step 2: Open a Part or Assembly file. You will not see any Simulation user interface (icons or toolbars) unless a model file is open. It can be a new empty file, as long as you have one open.

Step 3: Browse the pull-down menus (usually hidden beneath the SolidWorks logo) to Simulation > Help > Tutorials. You could also browse instead to Help > SolidWorks Simulation > Tutorials. As long as the Add-In is on, and a model file is open, you will be able to see both of these menu options.

SolidWorks Simulation- Restraint Preview Icons Video