In web technology, it is a common practice to build applications that “share nothing”. For example, if a web application is running on a web server, and you need move the application to another machine, it is extremely simple to do this if the app does not use data on the machine its running on.…

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Came across this nice document that talks about the strains and stress computations used in many nonlinear finite element codes. If you know the author of ths material, please do let me know. You can also find the entire set of materials here

I posted a detailed document on the TIEBREAK contacts. Here are a few things that I noticed after the I wrote the article. 1. Scale down the penalty stiffness down to 0.1 if you see instability. 2. It is important to have the two surface to be “just in contact” and not “too far” or…

In an earlier post, we saw how *CASE keywords can help us perform sequential and sequential+dependent simulations. But here I want to talk a little more about the LSCASEDRIVER program itself. LSCASEDRIVER is a simple yet powerful utility that is sometimes built into the LS-DYNA executable, but it can also be used in a standalone…

There are several sense switch controls that are available to interactively request LS-DYNA respond to certain pre-defined calls. The well documented sense-switch controls for Explicit calculations are listed below. General Sense-Switches Type Response —- ———————————————————— sw1 a restart file is written and ls-dyna terminates sw2 LS-DYNA responds with time and cycle numbers sw3 a restart…

Encryption has been around for several years but it finally comes to LS-DYNA in the form of GPG encryption which can be used at no additional cost to encrypt LS-DYNA input files to protect important proprietary data such as material definitions. Any portion of the input file can also be encrypted in multilple blocks of…

There are several methods available to interactively termination an running LS-DYNA job. They are briefly discussed here. 1. Sense Switch ‘SW1’ This command is typed by first typing ‘Control-C’ followed by ‘SW1’. This causes LS-DYNA to terminate gracefully by writing all the information from memory to the file system. 2. Creating a file ‘D3KIL’ in…

LS-DYNA is a general-purpose simulation software. This is a good thing for analysts since it provides tremendous flexibility in simulating a wide range of events. The downside to this is the fact that every simulation requires ‘best practices’ to ensure it meets the quality and accuracy requirements of th event that is being simulated. Additionally,…