Worked Example

This is the second worked example in the [[FITNET|FITNET]] FAD example collection (§13.2.6, SSTP10). Its focus differs from the [[bs7910-a533b-residual-stress-fad|first A533B example]]: this time it is a welded stainless-steel wide plate with a through-thickness crack, assessed for ductile tearing (the crack grows stably as the load rises) on the FAD. We follow the [[bs7910-a533b-residual-kis-annexm|usual routine]] — run it in mechCalc’s BS 7910 Clause 7 fracture assessment calculator, read the chart, and cross-check point by point against the FITNET literature. ...

In the FAD assessment of the [[bs7910-a533b-residual-stress-fad|four A533B welded-plate problems]], the residual stress intensity factor for the as-welded case, $K_I^S \approx 46\ \mathrm{MPa\cdot m^{0.5}}$, has always been entered directly: FITNET obtained it by integrating the measured residual stress profile, and we simply fed that ready-made number into the vertical coordinate $K_r$. A natural follow-up question: how does that 46 actually emerge from a residual stress curve, and can mechCalc compute it on its own? ...

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 ($K_I^S=46$). ...

This is the first of four problems on the A533B-1 welded plate. The shared background, common method, and residual-stress profile for all four are set out in the overview post: For the overview and method, see [[bs7910-a533b-residual-stress-fad|Where does residual stress push the assessment point? — A FAD recomputation of the A533B-1 large welded-plate fracture tests]]. This post focuses on one specimen and walks it through the calculator from input to reading the chart. ...

When you run a fitness-for-service (FFS) assessment on a welded pressure component, welding residual stress is almost always one of the hurdles you cannot step around. It is a textbook secondary stress (a self-balancing field): it plays no part in static equilibrium, yet it genuinely raises the driving force at the crack tip. The question engineers have asked for years is this: on the Failure Assessment Diagram (FAD), where does residual stress actually push the assessment point — and how much can post-weld heat treatment (PWHT) pull it back? ...

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Full worked example: tapped-thread joint (ESV) This article is a counterpart to the DSV example (article 8) . It highlights the differences unique to ESV: $w = 2$, $E_M = E_{BI}$, the cone-angle formula Eq. 42, and the R11 engagement-depth check. Engineering problem statement A bolt is screwed from the top into a cast-iron housing (grey cast iron GJL-250), fixing a steel cover plate. ...

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Full worked example: through-bolt joint (DSV) This article ties all the theory of the previous 7 articles into one complete calculation chain. Using a concrete engineering case, we go through every step of R0–R13. Engineering problem statement A steel flange joint using a single bolt to fix a cover plate. The design requirements are: ...