https://mechcalc.net/blog/en/tags/annex-m/ Recent content in Annex M on MechCalc how-to Guide https://mechcalc.net/blog/og-default.png https://mechcalc.net/blog/og-default.png Hugo en Thu, 02 Jul 2026 10:00:00 +0200 https://mechcalc.net/blog/en/posts/bs7910-annex-m-ki-tutorial/ Thu, 02 Jul 2026 10:00:00 +0200 https://mechcalc.net/blog/en/posts/bs7910-annex-m-ki-tutorial/ A guide to BS 7910:2019 Annex M: starting from crack-tip stress singularity, it explains the physical meaning of the stress intensity factor K_I, the general Annex M framework and its correction factors, the semi-elliptical surface-crack solution and evaluation points, the weld-toe magnification factor Mk, and the full calculation steps — with original diagrams and a live worked example. https://mechcalc.net/blog/en/posts/bs7910-a533b-residual-kis-annexm/ Thu, 25 Jun 2026 10:00:00 +0800 https://mechcalc.net/blog/en/posts/bs7910-a533b-residual-kis-annexm/ Across the four A533B welded-plate problems, the residual stress intensity factor K_I^S≈46 MPa·m^0.5 has always been entered directly into the FAD — but where does that number actually come from? This post uses the BS 7910 Annex M.4.2 calculator in mechCalc (finite-plate surface flaw, polynomial stress) to integrate the measured welding residual stress polynomial profile into the SIF at the deepest point of the crack, yielding 44.84 MPa·m^0.5 — only 2.5% off the 46 reported by FITNET — and shows how mechCalc reproduces this key intermediate quantity on its own.