Steel vs Aluminium Swap Comparator
Same part, different metal: weight, stiffness and deflection ratios.
Drop-in aluminium is 1/3 the weight but 1/3 the stiffness. Allowed to thicken (t³ in bending), aluminium still saves ~50% — why aircraft skins, not engine blocks, drove the Al revolution.
Formula
Steel vs Aluminium Swap Comparator is a free steel vs aluminum for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Steel vs Aluminium Swap Comparator
Same part, different metal: weight, stiffness and deflection ratios. The calculation implements same shape: 0.34× weight, 2.9× deflection; equal bending stiffness (t³ scaling): ~0.49× weight (Ashby substitution analysis). Drop-in aluminium is 1/3 the weight but 1/3 the stiffness. Allowed to thicken (t³ in bending), aluminium still saves ~50% — why aircraft skins, not engine blocks, drove the Al revolution.
How to use Steel vs Aluminium Swap Comparator
- 1Enter Current steel part weight in kg.
- 2Read Same-geometry aluminium weight, Deflection increase, Equal-stiffness Al weight instantly — no submit button needed.
- 3Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Steel vs Aluminium Swap Comparator?
- ✓Implements the standard formula — same shape: 0.34× weight, 2.9× deflection; equal bending stiffness (t³ scaling): ~0.49× weight
- ✓Reference cited on-page: Ashby substitution analysis
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Steel vs Aluminium Swap Comparator use?+
It computes same shape: 0.34× weight, 2.9× deflection; equal bending stiffness (t³ scaling): ~0.49× weight, per Ashby substitution analysis. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Drop-in aluminium is 1/3 the weight but 1/3 the stiffness. Allowed to thicken (t³ in bending), aluminium still saves ~50% — why aircraft skins, not engine blocks, drove the Al revolution.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Steel vs Aluminium Swap Comparator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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