Volex Labs / Calculations / Weld and detail fatigue design to Eurocode 3.

Weld and detail fatigue design to Eurocode 3.

Enter the detail category and the stress range spectrum, and Volex Anvil evaluates fatigue to EC3-1-9: the reference detail category ΔσC, the design fatigue strength ΔσRd on the relevant S-N curve, and the cumulative damage by Palmgren-Miner for a variable-amplitude spectrum.

Detail categories follow EC3-1-9 Tables 8.1-8.10, cross-checked against the IIW recommendations, so the classification of each weld or bolt detail is the standard one used in practice.

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What Volex Anvil checks

Detail category ΔσC — EC3-1-9 Tables 8.1-8.10
Design fatigue strength ΔσRd — EC3-1-9 §7.1
S-N curve with constant-amplitude limit — EC3-1-9 §7
Damage-equivalent stress range — EC3-1-9 §6
Cumulative damage (Palmgren-Miner) — EC3-1-9 §A

Validated against the published example

Welded detail fatigue strength — EC3-1-9 detail category EN 1993-1-9 §7.1; Hobbacher IIW Recommendations 2nd Ed

Quantity	Published	Volex Anvil	Error
Detail category ΔσC	80 MPa	80 MPa	0.00%
Design fatigue strength ΔσRd	69.57 MPa	69.57 MPa	0.00%

This case is one of 359 published checks the platform passes — the full table, with every source and every error, is public at volexlabs.com/verification.

Frequently asked

Which detail categories are included?

The full EC3-1-9 set (Tables 8.1-8.10) — plain material, welded attachments, butt and fillet welds, bolted connections and hollow-section joints.

Constant or variable amplitude?

Both — constant-amplitude checks use the endurance limit; variable-amplitude spectra are assessed by cumulative Palmgren-Miner damage.

Is it validated?

The detail category and design fatigue strength are checked against EC3-1-9 and the IIW recommendations — within 0.00%.

Free to use?

Yes — 10 calculations a month free; Pro (£29/month) adds unlimited runs and PDF calc sheets.

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