## Archive for December, 2016

### SOLIDWORKS 2017 Grouping Components in the Feature Tree

Thursday, December 22nd, 2016

### What is a Singularity?

A singularity is a function’s divergence into infinity. Simulation occasionally produces stress (or heat flux) singularities.

How do they occur? Mathematically, the solver uses matrices to represent the elastic field (displacements of the elements). When a highly localized load is applied, the gradients of the displacement vectors begin to diverge, causing the roots of the matrices to go to infinity. For a simplified explanation, see the stress equation below. Stress goes to infinity due to force applied in a very small area.

### Where do Singularities occur?

Singularities are usually seen at points, edges, or reentrant corners. Reentrant corners are interior corners, with angles pointing into the part. The high stress concentrations are usually seen near 90 degree corners, but can potentially occur for any angle less than 180 degrees.

### Why don’t they occur in real life?

Think of the common case of singularities created on interior corners. In software, that corner is perfectly sharp. In real life, there will always be a slight bend.  Also, the part may deform slightly, or “slip”, and allow the faces of the corner to slide against each other. The slight bend and additional friction allow for a converging stress.
“Adjust your legend’s color settings to grey out above the material’s yield point. This prevents singularities from overshadowing other important stress results!” – Joe Engineer, Know It All, GoEngineer

### 2016 Holiday Gift Guide for the Nerd You Love, Even if it’s Yourself.

Thursday, December 8th, 2016

It’s hard to shop for a gadget-y, tech-savvy person, but here’s a good gift guide for the nerd you love. In my family, I’m the nerd I love.

If you feel the urge to send me any of these items below, the address is 2033 Chennault Dr., Carrollton, TX 75006.

1.     Anoto’s Livescribe Smartpen, \$119.99

I write lists. On paper. With a pen.  Writing helps me remember, while typing with my thumbs on an itty bitty screen does not.  Then I struggle to coexist between a paper and paperless world. But Livescribe solves that. It’s a Smartpen that houses an infrared camera, ARM processor, Bluetooth Smart chipset, flash memory and lithium ion battery all work together to bring your notes to life on your tablet or smartphone. Android and iOS friendly.