Tag Archives: APDL.

How to do load combination in ANSYS–Method 2

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In the previous post, load combinations using APDL commands are shown. In this post, load combination using multiple analysis systems in the Workbench project page.

With this method, both the analysis systems share the “Model” which includes Engineering Data, Geometry and Mesh. Only boundary conditions(fixed support and force) and post processing are recreated.

In the first analysis system, Vertical Load and Standard Gravity Acceleration Load is applied.

In the second analysis system, along with the vertical load and gravity, 5% force and 10% acceleration is applied in other two directions. The following video shows this method 2.



Look for the upcoming video where the ANSYS load case files are used to post-process the results.

How to do Load Combination in ANSYS—Method1

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This post is about how to combine the loads, create load cases in ANSYS. Almost all professional projects will have load cases and load combinations. Although it varies from industry to industry, load combination is common. I am going to use the following terms very often. The best way I remember them are:

Load Step: a particular step in which you apply a load and have results loaded on to the database file(db file) after you solve.

Load Case: a results file which is a combination of one or more load steps results.

In general, you can define a load step anyway you want only during the pre-processing. Whereas you can define the load case file during post-processing.

In the following video, I am taking the previous example of cantilever I-beam to apply loads and combine them.

The loads I applied on the I-beam are :

Load Step 1: Apply a load of 1000N in X direction

Load Step 2: Apply a load of 1000N in Y direction

Load Step 3: Apply a load of 1000N in Z direction

Load Step 4: Apply an acceleration of 9.81m/sec^2 in Z direction

Load Step 5: Apply an acceleration of 9.81m/sec^2 in Y direction

Load Step 6: Apply an acceleration of 9.81m/sec^2 in X direction

The desired load combination is:

Load Combination 1: Load Step 3 + Load Step 4 –which is vertical load plus vertical acceleration due to gravity

Load Combination 2: Load Step 3 + Load Step 4+ 5% of Load Step 1+ 5% of Load Step 2+10% of Load Step 5+10% of Load Step 6     — which is vertical load+ vertical acceleration+ 5% in lateral directions and 10% acceleration in lateral direction.


The steps involved for load combination:

Step 1: Create Load Steps and Solve

Step 2: Convert Load Steps to Load Cases

Step 3: Use commands “LCOPER” and “LCFACT” to combine the load cases

Step 4: Create additional load steps by using “RAPPND”. Yes, you can convert the load cases to load steps so that you can view the view the results in Workbench via Mechanical. If you only create load cases, then you are limited to use classic ANSYS. In the video, I change the the step number to see the results on the fly!! Very useful command.

Step 5: Create seperate load case results file by using “LCWRITE”. This is useful for classic ANSYS users, as they can load the db file and results file(LCFILE command) and view the results / extract results.


This is a lot of information for first time user. It takes time to get the terminology and methods. Hope the following video makes things clear!!



Multiple Ways to change Material Properties in ANSYS

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Hello All,

In this post, I am going to show couple of methods to change the material. In ANSYS, material properties like Young’s Modulus, Poisson’s Ratio for a particular material are available under Engineering Data. You can add these materials to the project.  I used the same example project from the structural analysis of a plate.

In the following video, I have shown the following:

  • How to add material to the project
  • How to duplicate a material and edit the material properties
  • How to change material properties inside Mechanical using APDL commands. This method is useful especially if you are lazy enough to go back to workbench project page, add material or duplicate material to edit the material and then update the project to get the material added to the model. Using this method, you can avoid all that and directly edit the material property on the fly. Should be used only for quick checking. Otherwise you may forget the command snippet and wonder about the results.


–Thanks for reading my post!

–Vamshi Goli