Problem 3 — HLAW: into the high load-ratio regime, where plasticity dilutes residual stress (A533B as-welded, −30 ℃)
This is the third of four problems on the welded A533B-1 plate. The first two both sat in the low load-ratio brittle-fracture regime and compared residual stress; this one shifts the battlefield — to the high load-ratio, large-plasticity regime. For the shared background and method behind all four problems, see the overview post [[bs7910-a533b-residual-stress-fad|Where does residual stress push the assessment point?]]. What this problem asks HLAW = High-$L_r$ + as-Welded: as-welded condition, assessment temperature raised to −30 ℃, load increased into the high load-ratio regime. The warmer temperature lifts the fracture toughness somewhat off the lower shelf ($K_{mat}=62\ \mathrm{MPa\cdot m^{0.5}}$), while the load is raised to a failure load of 5.10 MN. The residual stress stays the as-welded value ($K_I^S=46$). ...