User manual of the MechCalc BS 7910 fracture assessment calculator: what it can and cannot calculate, the inputs of the eight cards, calculation steps 1 to 11, how to read the verdict and the two reserve factors, and the limits.
The finale of the four problems on the A533B-1 welded plate: same temperature and regime as Problem 3 (HLAW) β β30 β, high load ratio β but with post-weld heat treatment (PWHT). This article works through HLHT to show the double dividend of PWHT β it both relaxes the residual field (K_I^S 46β5) and restores toughness by an order of magnitude (K_mat 62β321) β and how this drives K_r down from 3.94 to 0.60; plus a thought-provoking twist: even with smaller residuals and higher toughness, HLHT fails at a slightly lower load than HLAW.
A walkthrough of the two K_mat estimation routes in BS 7910:2019 Annex J β the lower-shelf equation and the Master Curve β with full derivations, the T_K confidence margin explained, and three worked verification examples.