George Laird's blog

How to Become a Journeyman Simulation Engineer

It is an inside joke among simulation engineers about how long does it take to be considered a “journeyman” simulation engineer.  The answer is about five years since it takes that long for your mistakes to catch up with you!  It is a brutal profession since everyone is human but the price of failure is especially high when your FEA results are used to build prototypes that cost hundreds of thousands of dollars.  Which leads to another saying: “What is the difference between a design engineer and a simulation engineer?  A design engineer gets a second chance.”  Thus, we were pleased to hear from our client that their composite container passed mobility testing with flying colors.  Not only did it pass, the group doing the testing at Aberdeen said that it was the first time that such container had passed all tests at 100% from drop test, rail impact, heavy lift to land transport.  If you would like to read about more about our FEA work on this container, please take a look at 026_Jensen, Broad-Spectrum Stress and Vibration Analysis of Large Composite Container.pdf.

Mobility Testing of Large Composite Container - FEA Consulting Services - Composite Simulation Engineering

12th European LS-DYNA Conference, Koblenz, Germany

The LS-DYNA Conference in Koblenz, Germany was the usual blend of great presentations and even greater social events.  The location was beautiful and the Conference was especially well-organized by DYNAmore, Germany (co-sponsored with LSTC, Livermore, CA).  Predictive with ENHU, China hosted a morning run event with T-shirts to whoever could show up at 6:45 am.  Besides the run, we had our “booth” to support the LS-DYNA North American Team and on the technology side, we presented two papers: Impact Analysis of Polymeric Additive Manufactured Lattice Structures and Transient Dynamic Implicit Analysis for Durability Testing of Bus Seats.

Predictive Engineering LS-DYNA Nonlinear FEA Consulting Services - Koblenz 2019

Impact Analysis of Additive Manufactured Lattice Structures | LS-DYNA

We are pleased to announced a year-long contract award from the US Army Natick Soldier Systems Center (NSSC) to continue the investigation of additive manufactured materials for improved blunt force protection in helmet systems.  Our role is to work with Natick’s engineering team to simulate the impact behavior of additive manufactured 3D lattice systems.  In prior work  (see our Case Study: Impact Analysis of Additive Manufactured Lattice Structures) we discovered that getting the material characterization correct was not easy.  In this new work, we’ll revisit that whole process and look into manufacturing variability of the additive materials from bulk samples down to thin noodle-like structures that are necessary to for the 3D lattice structures of the foam replacement pads.

FEA Impact Analysis of Additive Manufactured 3D Lattice Structures for Improved Blunt Force Protection


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