What Even Is FEA?
FEA gets mentioned a lot in product development conversations, usually without much explanation. Someone says ‘we should run an FEA on that bracket’ and everyone nods, but the honest truth is that plenty of people nodding aren’t entirely sure what it means or when it’s actually necessary.
So here’s the plain English version: what FEA is, what it isn’t, and more usefully, how to tell whether your product genuinely needs it.
FEA in one sentence
Finite Element Analysis is a way of testing how a part will behave under real-world stress, load, pressure, vibration and heat, using a computer model before you build anything physical.
The software breaks a 3D model into thousands of tiny connected elements (that’s the ‘finite element’ part), applies the forces you specify, and calculates how each element responds. Stack all those calculations together and you get a full picture of how the whole part behaves — where it flexes, where it’s overbuilt, and critically, where it’s likely to fail.
What it replaces
Before tools like this existed, the only way to know if a bracket would hold was to build one, load it until it bent or snapped, and adjust from there. That’s slow, expensive, and only tells you about the exact sample you tested — not the next hundred you’ll manufacture.
FEA doesn’t remove physical testing entirely, and it shouldn’t. But it lets you catch the obvious problems, as well as a fair few non-obvious ones, while the part still only exists in CAD. That’s the whole value proposition: moving failure discovery from the expensive end of the process to the cheap end.
Sheet metal — One area where FEA earns its keep
Sheet metal structures are a particularly good candidate for FEA, for a reason that isn’t always obvious. Thin formed metal behaves in ways that are genuinely hard to predict by intuition alone. A bend radius, a cut-out, a mounting hole placed slightly too close to an edge, each of these changes how stress moves through the part and not always in the direction you’d guess.
Get it wrong and the failure mode is rarely dramatic. It’s a bracket that develops a stress crack after eighteen months in the field. A panel that flexes slightly more than expected and eventually fatigues at a weld point. A mounting bracket that’s technically fine under a single static load but fails after ten thousand cycles of vibration. These are exactly the failures FEA is built to catch before they exist.
The humble bracket — a good case study in itself
Load bearing brackets are one of the clearest examples of why FEA matters, precisely because they look so simple. A bracket is just a bent piece of metal with holes in it, easy to dismiss as something that doesn’t need much analysis. In practice, brackets are where a surprising amount of structural failure actually happens, because they sit at the exact point where load transfers from one part of an assembly into another.
The questions that matter for a bracket are rarely about whether it can hold a static load once — most can. They’re about what happens after thousands of load cycles, whether the bend radius creates a stress concentration right where a mounting hole sits, whether the material thickness chosen is doing useful work or simply adding cost and weight out of caution. FEA answers all three before a single bracket is cut, which is exactly why it’s one of the most common and most valuable applications we run it for.
Examples from our own work
We don’t treat FEA as a box-ticking exercise — it directly shapes decisions on the projects we run it on. Two examples from sheet metal products we’ve delivered show how that plays out in practice.
The RMG Pedestal, an industrial sign-in kiosk we designed for Royal Mail Group, is an all-metal structure engineered specifically for lean assembly and deployment in robust environments — the interlocking geometry itself provides alignment and retention, reducing the number of fixings needed. That approach only works if the structural geometry is genuinely doing the job intended. FEA was used throughout development to confirm that the load-bearing panels and mounting points could handle daily use across a large depot estate, without over-specifying material thickness that would have added unnecessary cost and weight when produced at scale.
Sentinel, our automated cradle lock design for mobile computers, presented a different structural challenge: a steel clamp mechanism that needs to survive repeated mechanical cycling, while resisting forced entry. Getting the wall thickness and clamp geometry right mattered enormously — too thin and the mechanism fatigues over time; too thick and the product becomes needlessly heavy and expensive to manufacture at volume. FEA let us validate the design against realistic load cycles before committing to tooling, rather than finding out through field failures.
“The most expensive place to discover a structural problem is in the field. FEA moves that discovery back to the CAD stage, where it costs almost nothing to fix.”
So does your product need it?
Not every part needs FEA. A simple bracket with generous safety margins and low consequence of failure often doesn’t justify the time. The questions worth asking are: Does this part carry meaningful structural load? Will it experience repeated cycling, vibration, or impact over its service life? Is failure expensive, dangerous, or reputationally damaging if it happens in the field? Are you about to commit to tooling, where a design change afterwards is costly?
If the answer to two or more of those is yes, FEA is very likely worth doing. If you’re unsure, that uncertainty is itself usually a good enough reason to run the analysis — it’s a small cost relative to what a field failure or an unplanned tooling revision would cost.
FEA isn’t about mistrust in a design. It’s about knowing, with actual evidence, that a part will do what it’s meant to do — before you’ve spent money finding out the hard way.
MAKE provides FEA structural analysis as a standalone service or as part of a full design programme — including sheet metal, injection moulded, and fabricated assemblies. Get in touch to discuss your project.