Posts Tagged ‘Tips and Tricks’

Material Models for Simulation Premium

Friday, March 20th, 2015

What Material Model should be used for a specific

Non-Linear Study?

A commonly asked question is what material model should be used for a specific Non-Linear Study?  The answer is divided into three parts.

1. What is the material in the design(Steel, Rubber, Plastic, etc.)?

2. What is happening to the material(remain elastic, plastically deform etc.)?

3. What material property data is available for the material?

Material Choice in Design

Lets discuss material choice first.  Typically metals are characterized as a linear material and act as such.  Linear materials are simplified to behave predictably under specific loading criteria.  For Linear materials the Elastic Modulus, Poisons Ratio, and Yield Strength are all assumed to be constants.  Rubber, Plastics and Composites are accepted as Non-Linear materials and immediately require more than fixed material values.  As a rule of thumb the fore mentioned grouping holds true as long as the loading conditions dictate as such.

What is Happening to the Material?

What happens to the material under load?  What happens to the material during loading is as much a factor as the original material choice when specifying a material model.  Metals typically operate with a portion of the stress strain curve known as the elastic region.  The elastic region is typically from zero stress/strain to the yield point.  The slope of this line is the Elastic Modulus. When a load is applied and then removed the geometry will return to a zero state of stress and strain.  However what happens when the model moves beyond yield.  The once Linear Material is now Non-Linear and requires a defined Stress Strain Curve.  The Stress Strain Curve dictates how the material behaves under load beyond yield. Plastics, Rubbers, and composites are already Non-Linear and require a Stress Strain curve for their definition as the linear region of their curves either does not exist or is very small.

Stress Strain

The information assumed about the material helps determine what material model can be utilized within simulation.  For some materials a simple stress strain curve is not enough and one or more of the simple tension, bi-axial tension and shear test curves is required.

 What material property data is available for the material?

SOLIDWORKS Simulation Premium contains several different material mathematical models to choose from, and covers a wide range of options to best suite the analysis being ran. Please consult the Simulation technical reference guide and help file for more information on the models and their uses.

Simulation Material Choices

A general list of materials models and its use is below.

Elastic Models: Geometry Returns To It’s Original Position After Loading

Linear Elastic Isotropic –        Linear Material with properties the same in all directions x,y,and z

Linear Elastic Orthotropic-   Linear Material with properties different in the x,y, and z directions

Non-Linear Elastic-                Non-Linear Material with elastic properties (require a stress/strain curve)

Elasto- Plastic Models: Geometry Can Plasticity Deform When Loaded and Unloaded

Plasticity von Mises-              Studies von Mises Stress values, Goes Beyond Yield

Plasticity Tresca-                    Uses Shear Criteria and more conservative than von Mises formalization

Plasticty Drucker Prager-      Approximates Granular soil

Hyper Elastic Elastomers: Large Capacity To Take Strain With Relatively Low Stress Require a combination of the three curves mentioned above.

Mooney-Rivlin(M-R)-            In-compressible Strain up to 150% derived from 3 curves

Ogden(OHE)-                          In-compressible Strain up to 500-600%

Blatz-Ko-                                   Compressible Poisson’s Ratio is assumed to be 0.25

Simulation Premium also offers a Nitinol Model and a Viscoelastic for specific applications.

The above is meant to be a general guide as to what material model to choose for specific applications.  Three main factors are involved when choosing a material model, the material itself, loading conditions/application, and the material properties.

Click Here to learn more about SOLIDWORKS Simulation Premium. 

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

SOLIDWORKS Model-Based Definition (MBD) Has Been Released

Monday, March 9th, 2015

With SOLIDWORKS 2015 SP2, MBD was released at the same time.  Well what is MBD?  It is an integrated drawingless manufacturing solution.  Instead of creating a typical 2D drawing, all of the needed information is placed on the 3D model.  This helps reduce errors, increases production efficiency, and support industry standards.

You might wonder how this increases production efficiency.  It will make your process more efficient because there is not a need for 2D drawing files.  All of the information is already on the 3D file so why not use it?  The point of a 2D drawing file was to communicate to manufacturing on what the final item should look like.  This has been the main delivery.  A majority of the time it took to create the 2D drawing is now saved.

2D-3D

So you might be thinking that I still need to have dimensions and add notes so that will take a bunch of time.  All the time I am saving from the 2D drawing is being placed on the 3D model.  That’s not the case and leads me into the reduction of errors.  SOLIDWORKS MBD uses a tool that has been in SOLIDWORKS since 2008; DimXpert.  DimXpert is extremely powerful in creating PMI.  It has the ability to automatically create the manufacturing dimensions with tolerance on the 3D model.

dimxpert

But the reduction of errors comes with the ability to check all the faces for a dimension and tolerance by changing the face color.

SOLIDWORKS MBD’s main job is to organize all of the PMI data.  It does this by creating custom views to represent specific dimensions.  With 2D drawings you have multiple views with specific dimensions.  You do the same process with MBD by creating custom 3D views.  The helps deliver the intended information to production with less confusion.

3dviews

How is the information delivered to production?  You have 2 options which are industry standards.  You can save the information to eDrawings or a 3D PDF.  The 3D PDF is fully customizable to match your requirements.

MBD 3DPDF

I feel MBD is a great way to save time, reduce errors, and communicate easier with manufacturing.  If you would like more information or would like to see a demo, please contact 3DVision @ 1-800-745-3136 or click here.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Available Tables in SOLIDWORKS Drawings

Friday, February 13th, 2015

I get asked about the different tables in SOLIDWORKS drawings.  I’ll go over some of these as a high level overview.  This will cover BOM, Hole Table, Revision Tables, Weldment Cut List Tables, General Table, Weld Table, Bend Table, and Punch Tables.

Closed Table Rendered in SOLIDWORKS Drawings
BOM

The Bill of Materials is a list of the components and the quantities of each needed to manufacture the end product.  This can be customized a lot to be able to show different properties, different fonts, etc.

Bill Of Materials in SOLIDWORKS Drawing

Bill Of Materials

Once you would get it looking like you want, you would want to save it out as a template so you can easily get back to same style.  If you Right Mouse Click on the table you will get the option to save it.  You can then specify it as a Template and place it with your other ones.  The next time you start a BOM, you will want to choose the one you just saved out and the columns and font will be the same.
Save as template in SOLIDWORKS Drawing
When you RMC, you will notice you can save the BOM as an excel file.  Now with it in excel, you can import it to an ERP/MRP system.

Hole Table

This is used to automatically generate hole information in a tabular format.  The table will show the location and hole size from a specified origin.

Hole Table in SOLIDWORKS Drawing

Hole Table

You also have the ability to customize it with a specific font and size.  You can also add tolerances for the locations and the hole sizes.

Revision Tables

This type of table is used to represent the latest revision of the drawing.  You can see the description of the change, the date it occurred, who did it, and the revision symbol in the drawing.

REVISION TABLE in SOLIDWORKS Drawing

REVISION TABLE

The revision table can also update the Revision Block in your title block.

Weldment Cut List Tables

A cut list is similar to a BOM.  This is used with the weldment function to represent the cut lengths for structural shapes.

CUT LIST in SOLIDWORKS Drawing

Weldment Cutlist

The cut list can again be customized like the BOM to show what is important for final manufacturing.  It has the same ability to be saved as a template and excel file.  This is only active when you have a part file that is a weldment.

General Table

This would be used when you need to type in data in the cells rather than having the software automatically generate the data.  You have the same ability as other tables.  You can split, merge, sort, save, etc this table just like the other types.

Weld Table

The weld table is a summary of weld specifications.  It will represent weld quantity, size, symbol, length, and other custom bead properties.

WELD TABLE SOLIDWORKS Drawing

Weld Table

The table will get the data from the drawing view.  If you add the weld beads to the model, it will automatically fill the table out.  If you are only placing the weld symbols on the drawing views, there is an option in the property manager to include drawing annotations.

Bend Table

BEND TABLE

Bend Table in SOLIDWORKS Drawing

Bend tables are used with Sheet Metal parts.  In place of having many callout for each bend, you can represent these in a table.  It will specify the bend direction, the angle that it needs to bend to, and the radius of the bend.

Punch Table

PUNCH TABLE

Punch Table in SOLIDWORKS Drawings

Punch tables are also used with Sheet Metal parts.  This is very similar to hole tables but in place of holes, it is used with form features.  The table will represent the location of the punch on the flat pattern, the punch ID, the quantity, and the angle between the X-axis and the tool.

Thank You

This was just a high level overview of SOLIDWORKS tables.  If you have any specific questions about them, don’t hesitate to contact us.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Rotating Mesh Region SOLIDWORKS FLOW SIMULATION

Friday, January 30th, 2015

The SOLIDWORKS Flow Simulation team has added powerful new functionality to their arsenal,  Rotating Mesh Regions.  Rotating mesh regions or “sliding mesh regions” allow the user to rotate geometry in the model and drive the fluid of the system.  If you are designing any device that utilizes, impellers, propellers, or other rotational apparatus Flow Simulation can provide results such as flow rate, pressure drop, velocity, and many more, all based on the rotation of the geometry.  A transient or time based study is required to use the Rotating Mesh Region.

Application of Rotating Mesh

Application of Rotating Mesh

 

Rotating Mesh Region

Rotating Mesh Region

 

If you have SOLIDWORKS Flow Simulation 2015 already loaded you can find the rotating mesh region under the rotation type “Local regions(s) (Sliding mesh).  Utilize the rotating region boundary condition as usual in the Flow Simulation Design Tree.

Analysis Settings

Analysis Settings

 

For a look at the Rotating Mesh Region please see the following link.

 

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

2015 Flow Simulation Compare Tool Improvements

Monday, November 24th, 2014

Every new release of Flow Simulation adds more functionality, faster solution times, and customer requested enhancements.  One of the 2015 enhancements is the Study Compare Tool overhaul.  In 2014 a user could compare any active plot and goals between projects in the same model.  This is very useful functionality when comparing between different design options under the same flow conditions.  Only being able to compare active plots lead to some drawbacks and some fumbling for what you actually wanted to see.  The goal plots gave the engineer only a table view of the reported values.  Great for a quick numerical comparison, but this left the user manipulating the data in Excel to get nice visual graphs.

 

This is where 2015 Flow Simulation Compare Tool comes in.  2015 Compare improvements allow the user to directly compare all the generated plots in the project, not just the active one.  If they do not want all the plots they can pick and choose which ones they want to see though a check box interface.  The comparison does not end there, we now can compare XY plots, Tabular Data, and other enhanced chart options.  New to the goal plot is a series of enhanced display options allowing the user to display the goal plot data in bar chart, scatter plot, and over/under displays.

Compare Interface

 

 

Pressure Chart

Bar Chart

 

To access the Flow Simulation Compare Tool, go to Tools>Flow Simulation>Results>Compare, or choose the compare Icon on the Flow Command manager.

Compare Results

Compare Results

 

2015 Flow Simulation Compare Tool enhancements, improve the direct outputs from Flow Simulation,  greatly decrease the time to get to the important data, give the engineer better knowledge of the Project results.  Flow Simulation in 2015 is helping make the user, Better, Faster, and Smarter.

Globe Valve Flow

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

Duplicate SolidWorks Plastics Project

Tuesday, June 24th, 2014

SolidWorks Simulation allows a user to ‘Duplicate’ a study, and SolidWorks Flow Simulation allows a user to ‘Clone’ a project.  Why not SolidWorks Plastics?  SolidWorks plastics is an injection molding software that allows a user to understand the manufacturability of a plastic part.  Because this is a fully integrated SolidWorks Simulation product different Projects are related to configurations in the part.  To re-use the setup from project to project please follow the instructions in the link below.

Duplicate Plastics Project

This functionality allows a user to quickly duplicate a project to change different parameters and re-run.  If you are currently using SolidWorks Plastics this information will speed up your work flow and Simulation setup times.

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

Multiple Flow Result Plots in E-Drawings for 2014

Tuesday, April 22nd, 2014

New for 2014, The ability to save multiple result plots in one E-Drawings file.  Previously the result plots needed to be saved in individual E-Drawings files. This caused more files to be generated and shared than need be.

To generate multiple result file plots in one E-Drawings file follow this procedure.

  • Show all plots desired to be included in the E-Drawings file
  • Right Mouse Button on the Results Folder and Select Save Image
EDrawings Save Image

E-Drawings Save Image

  • Choose the E-Drawings File Format
EDrawings Pull Down

E-Drawings Pull Down

Once in E-Drawings you can turn on or off the individual plots as needed to convey the content you wish to show.

Multiple Flow Plots E-Drawings

Multiple Flow Plots E-Drawings

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

Weldments and Bill of Materials

Wednesday, March 26th, 2014

There are many different ways to create structural frames.  One method might be creating it as an assembly with many individual parts.  Another method, which is my preferred  way, would be as a single multibody part…as a Weldment.
Weldment Icon
The Weldment way allows for easy design changes, automatic structural member trimming/extensions, and creation of cut lengths.  This however is typically just a portion of the overall design.  There might be many more pieces that go on the frame.  This is when you would add your Weldment design to an assembly.

Now with your Weldment in the assembly and the other components attached, you need a Bill of Materials (BOM).  It’s possibly to show the cut list for all the structural members in an assembly BOM.  You will need to choose a BOM Type of Indented in the PropertyManager.

BOM Property Manager
Once you choose the indented type, the BOM will show as a cut list.  The QTY column shows a total length for the structural member.

BOM Image
If you then choose “Detailed cut list” in the BOM Type, it will break each member out in their own row with a length value.

BOM Image Detailed
Now your assembly BOMs can show all the individual items even in the Weldment.  But what if you are using Enterprise PDM.  Can you see the cut list in EPDM?  Of course you can.  It is under the Bill of Materials tab.  You would need to set-up a Weldment Cut List template in EPDM but that is very simple.

EPDM Cut List
As you can see, the cut list item names can be shown to make finding the correct member easy.  Just like in a drawing, you can choose to see a Weldment BOM.

EPDM Weldment BOM
This will group all the members together giving you a total quantity.  If you select the “Contains” tab, and RMB on a Weldment member, you get some more useful functionality.

EPDM Contains Tab
When you choose “Properties”, you can see the members data card with the length.

EPDM Data Card Weldment
You will need to add the length field to the card and map it to the “BOM Quantity” variable.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Flow Simulation ‘Replicate Condition’

Thursday, March 20th, 2014

New for 2014 a user has the ability to apply a single Boundary Condition to multiple instances of the same part.  This is a great time saving tip.  No more manually adding the same Boundary Condition to instances of the a part.

With your setup you can assign Boundary Conditions such as an “Inlet”, “Outlet”, and “Heat Source” to  “Part1 “(face/volume) for example.

Simply Right Mouse Button the Boundary Condition and select “Copy to Component Instance”.

The Boundary Condition auto populates on all “Part 1s” in the model.

You can deselect the instance(s) you do not want included.

Note: the “Part 1″ needs to be a part in an assembly for the transfer to work.

For the full pdf instructions please see the link below:

Replicate Condition Flow

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

Circuit Works and Flow Simulation Working Together

Tuesday, February 25th, 2014

When you think about it, it makes sense that different parts of our SolidWorks Software work together to make a total package.  Keeping in this tradition now in 2014 Circuit Works and Flow Simulation work together to make your life easier.

2014 Flow simulation now imports the Circuit Works component properties and applies them automatically as boundary conditions in your Flow Simulation setup.  Previously these properties would be input manually.  Now we can import ECAD file PCB or Component Thermal Properties to Flow Simulation.

Circuit Board

Circuit Board

Some of the properties that can be directly utilized from Circuit Works are, Dielectric and Conductor Density, Specific Heat, Conductivity for PCBs, and Conductivity for Volumetric Heat Sources.

Circuit Board Thermal Flow

Circuit Board Thermal Flow

Two Import Options:

Right-click Heat Sources and select Import volume source from model. Select the heat sources to import in Item properties.
Right-click Printed Circuit Boards and select Import Printed Circuit Boards from model. Select the PCBs to import in Item properties.

Import Interface

Import Interface

If you are doing Flow Simulation on Electronics Enclosures check out the new Circuit Works import options.  This new feature is a great time saver.  Manually adding these properties on a typical circuit board (100’s of components) is tedious and time consuming.  Circuit Works integration brings this task down to a few simple clicks.

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

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