George Laird's blog

Predictive Engineering Opens New Office in Munich Germany

Predictive Engineering announces the opening of its new office in Munich, Germany. Situated in central Europe, Munich offers the ability to quickly communicate with continent-based clients within the same time zone. An advantage for Predictive and its sister company Applied CAx is that Munich is also the headquarters for Siemens, a worldwide provider of engineering equipments, systems and PLM Software. If your work brings you to Munich, please lets us know and we can arrange a meeting. 

Mit freundlichen Grüßen
George Laird, PhD, PE
Munich, Germany


Siemens PLM Software Munich GermanyMunich Germany - Predictive Engineering's New Office

Doing a bit of Research on Brazing of Ceramics to Metals

I was doing a bit of online research on the FEA modeling of the brazing process. We have a client making high-tech ceramic to metal fixtures. The ceramic is joined to the metal substrate via a brazing process. Upon cooling to room temperature and depending upon the geometry and material selection, residual stresses can develop to the point of causing failure of the components. It is tricky and we have embarked on a modeling project to quantify the mechanical response of these fixtures. Well, back to the story line. During this search I stumbled across this old paper that I had co-authored with a client. The paper is titled "CFD Analysis of Automatic Test Equipment." It was a trek down memory lane to see these old CFD models and realize that we have been doing CFD consulting services for more than 20+ years. It was some sweet work on large test equipment that was cooled using both water and air loops. The paper shows how we used CFD global (machine) to local modeling (board-level) to arrive at accurately predicting chip junction temperatures. Looking back, yes the models were crude and the graphics a bit funky but what can we say - it was 2002 and it worked!

If you would like to read the paper, go ahead and click here

LS-DYNA: Observations on Material Modeling

This is the 4th in a series of informal articles about one engineer’s usage of LS-DYNA to solve a variety of non-crash simulation problems. The first was on LS-DYNA: Observations on Implicit Analysis, the second was on LS-DYNA: Observations on Composite Modeling, and the third was LS-DYNA: Observations on Explicit Meshing.

As a former metallurgist whose specialty was structure-property relationships, I have a keen appreciation for how materials deform under load. At the federal lab where I worked, we had a lot of mechanical test equipment where I could break, crush and impact all sorts of things. This experience grounded me in my appreciation of how difficult it is to simulate the mechanical response of materials using some sort of X-Y plot of stress versus strain.


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