Reduction of Area Calculator
The other ductility number — area shrink at the fracture neck.
RA resists gauge-length games and spots hydrogen embrittlement that elongation misses — embrittled steel keeps its %El but its RA collapses. Inspectors' favourite tell-tale.
Formula
Reduction of Area Calculator is a free reduction of area 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 Reduction of Area Calculator
The other ductility number — area shrink at the fracture neck. The calculation implements %RA = (A₀ − A_f)/A₀ = 1 − (d_f/d₀)² (ASTM E8). RA resists gauge-length games and spots hydrogen embrittlement that elongation misses — embrittled steel keeps its %El but its RA collapses. Inspectors' favourite tell-tale.
How to use Reduction of Area Calculator
- 1Enter Original diameter in mm.
- 2Enter Diameter at fracture in mm.
- 3Read Reduction of area instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Reduction of Area Calculator?
- ✓Implements the standard formula — %RA = (A₀ − A_f)/A₀ = 1 − (d_f/d₀)²
- ✓Reference cited on-page: ASTM E8
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Reduction of Area Calculator use?+
It computes %RA = (A₀ − A_f)/A₀ = 1 − (d_f/d₀)², per ASTM E8. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
RA resists gauge-length games and spots hydrogen embrittlement that elongation misses — embrittled steel keeps its %El but its RA collapses. Inspectors' favourite tell-tale.
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 Reduction of Area Calculator 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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