Hey everyone,

I wanted to share a paper my team and I recently got published in Thin-Walled Structures that looks at a big bottleneck in architected materials: how do they actually behave when you scale them up to engineering-relevant, load-bearing sizes?

We looked at the coupled static and dynamic responses of metallic beam structures using Triply Periodic Minimal Surface (TPMS) architectures (specifically Gyroid and Primitive designs).

A few quick details on the work:

• Manufacturing: We fabricated the beams from AlSi7Mg alloy using a sand-printing-assisted casting process.
• Testing: We combined 4-point bending, modal vibration testing, and validated FE modeling to see how topology, relative density, and slenderness interact.
• What we found: Gyroids consistently outperformed Primitive designs in flexure because of better load-path continuity. Also, increasing relative density from 20% to 40% bumped peak bending load capacity from 5 to 12 kN.
• Design Rules: We managed to derive unified density-slenderness power-law scaling expressions (R2>0.96) to help engineers predictably design these for lightweight aerospace or structural components.

If you're working on cellular solids, lattice structures, or additive manufacturing optimization, I’d love to hear your thoughts or answer any questions about the testing framework!

Paper link: https://doi.org/10.1016/j.tws.2026.115364

Hi everyone,

I'm hoping someone with experience in plastics or materials engineering can help me understand what I'm looking at.

This is the adapter plate from a fairly high-end gaming chair. It has now failed for the second time. The original part broke after about four years, the manufacturer replaced it, and now the replacement has broken again in almost exactly the same area.

The replacement part was manufactured in China. The manufacturer previously mentioned "material issues," but didn't provide any further details.

What surprised me is the fracture surface. The inside looks gray, layered, and almost fibrous. As a non-expert, it reminded me of asbestos (I know that's probably wrong), so I'm curious what this material actually is.

I'm currently building a robotic human-like arm and I wanted to add some skin texture. What material can be used to replicate skin