In Tips & Tricks Series

Understanding Abaqus Standard Negative Eigenvalue Messages

Negative eigenvalue messages are generated during the solution process when the system matrix is being decomposed. The messages can be issued for a variety of reasons, some associated with the physics of the model and others associated with numerical issues. An example of the message that is issued is: ***WARNING: THE SYSTEM MATRIX HAS 16 NEGATIVE EIGENVALUES. IN AN EIGENVALUE EXTRACTION STEP THE NUMBER OF NEGATIVE EIGENVALUES IS THIS MAY BE USED TO CHECK THAT EIGENVALUES HAVE NOT BEEN MISSED. NOTE:...

In Tips & Tricks Series

Troubleshooting Abaqus/Explicit analyses that use contact pairs

This blog explains the different errors encountered while using Abaqus/Explicit and the ways to debug and troubleshoot them. Tracking Difficulties Reason: By default, Abaqus/Explicit uses a fast, local tracking algorithm to track the penetration of a slave node into the master surface; at a frequency of every 100 increments (the user can change this default), Abaqus/Explicit performs a global search. If penetration by a slave node goes undetected for a period of time (in between the global...

In Tips & Tricks Series

Common Errors and Warnings in Contact and Convergence

While running the analysis on a model with contacts, a major problem arises i.e. convergence. It is not just because of single reason, that it can be resolved in an easy way.  When you come across such problems in different types of analysis, job will terminate by showing an error message or a set of warnings in the analysis. That means the solution is unable to converge. There are different reasons for why an ABAQUS analysis fails in obtaining the convergence.  The main key area we need to look...

In Design #Tips & Tricks Series

Performance settings in CATIA V5

There are many ways to manage the performance of CATIA V5 & accuracy of models. To improve performance & increase productivity, we need to configure the settings properly. Some of these options are discussed in detail in this document. These will immensely benefit CATIA users. Undo Stack Undo ➞ Stack size ➞ change from 10 to 5 Stack Size defines the maximum number of commands which can be undone for each document. Lower the value better the performance. More the stack value,...

In Design #Tips & Tricks Series

Using Publications in CATIA V5

With the help of Publications in CATIA V5, one can make different geometrical features available for use in the specification tree. One can publish a plane, a sketch or a parameter which is not readily visible in the specification tree. In assembly workbench, during Contextual Design, Publication option becomes very useful. In CATIA V5, go to Tools ↦ Publication The Publication command is used to: Publish a geometrical element Edit the default name of the published element ...

In Tips & Tricks Series

Common CATIA V5 Shortcuts & Customization

For any CAD software, Model manipulation options are very important to improve the productivity & for ease of use. This article will introduce you to all these options below. Model Manipulation with Mouse Function Options using your Mouse Pan Hold Middle Mouse B Zoom Hold Middle Mouse B + Click Right B or Hold Middle Mouse B + Click Left B Rotate Hold Middle Mouse B + Hold Right B or Hold Middle Mouse B + Hold Left B Model Manipulation with Keyboard Function Option...

In Cloud #Tips & Tricks Series

Ways to Avoid “Click Ok to Terminate” Error in CATIA V5

This is a default runtime exception message which appears when CATIA terminates abruptly. This message can be changed by changing the text file content of file in installation directory: installation directory\win_b64\resources\msgcatalog\CATAfrErrorCatcher.CATNls There can be several reasons that trigger CATIA crash or ‘Click Ok to Terminate’ error. Below are some of the reasons of this error and the tips & ways on how to avoid this error. Loading too much data (Memory Errors) : Whenever...