https://mechcalc.net/blog/en/tags/plastic-collapse/ Recent content in Plastic Collapse 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 10:30:00 +0200 https://mechcalc.net/blog/en/posts/bs7910-annex-p-ref-stress-tutorial/ Thu, 02 Jul 2026 10:30:00 +0200 https://mechcalc.net/blog/en/posts/bs7910-annex-p-ref-stress-tutorial/ A guide to BS 7910:2019 Annex P: it explains the physical meaning of the reference stress σ_ref and the reference-stress method, the equivalence of σ_ref and the limit load P_L, how it gives the FAD horizontal axis L_r, the general framework and net-section degradation, the plastic cut-off L_r,max and flow stress, and the calculation steps — with original diagrams and a live worked example. https://mechcalc.net/blog/en/posts/bs7910-a533b-hlaw-fad-walkthrough/ Wed, 24 Jun 2026 12:00:00 +0800 https://mechcalc.net/blog/en/posts/bs7910-a533b-hlaw-fad-walkthrough/ Third of four problems on the welded A533B-1 plate: the HLAW specimen — as-welded, warmed to −30 ℃, with the load raised into the high load-ratio (large-plasticity) regime. We run it in mechCalc's BS 7910 Clause 7 fracture assessment calculator to see how the assessment calls plastic collapse once L_r=1.80 exceeds the cut-off value L_r,max, and why the relative weight of residual stress is diluted by plasticity at high L_r so that fracture toughness becomes the governing factor.