https://mechcalc.net/blog/en/tags/fatigue-assessment/ Recent content in Fatigue Assessment on MechCalc how-to Guide https://mechcalc.net/blog/og-default.png https://mechcalc.net/blog/og-default.png Hugo en Fri, 26 Jun 2026 10:00:00 +0800 https://mechcalc.net/blog/en/posts/bs7910-annex-d-misalignment/ Fri, 26 Jun 2026 10:00:00 +0800 https://mechcalc.net/blog/en/posts/bs7910-annex-d-misalignment/ When two plates or shells to be welded together are 'not aligned' (axial misalignment or angular distortion), the load path of a tensile load is forced to bend, adding a layer of local bending stress σs at the weld. BS 7910:2019 Annex D is a look-up handbook: it gives a formula for each of 10 standardized misalignment configurations (7 butt-joint types + 3 cruciform types), letting you compute σs directly from the geometry, or convert it to a stress magnification factor km to feed into the Annex M stress intensity factor and the Clause 7 fracture assessment. This article gives the physics, then a figure and algorithm for each type.