https://mechcalc.net/blog/en/tags/kta/ Recent content in KTA on MechCalc how-to Guide https://mechcalc.net/blog/og-default.png https://mechcalc.net/blog/og-default.png Hugo en Sat, 21 Feb 2026 12:00:00 +0100 https://mechcalc.net/blog/en/posts/08-fatigue-crack-growth/ Sat, 21 Feb 2026 12:00:00 +0100 https://mechcalc.net/blog/en/posts/08-fatigue-crack-growth/ <blockquote> <p>🧮 <strong>Go straight to the calculator</strong>: to skip the derivation and use the online tool with a built-in verification flow, open the <a href="https://mechcalc.net/blog/calculators">fatigue crack growth calculator</a> from the large category cards on the calculators home page.</p> </blockquote> <h2 id="1-where-fatigue-crack-growth-sits-in-an-lbb-analysis">1. Where fatigue crack growth sits in an LBB analysis</h2> <p>At the core of a Leak-Before-Break (LBB) argument: you must show that, over the service life, the time for an initial non-penetrating surface flaw to grow by <strong>subcritical crack growth</strong> through the wall and cause a leak — and the time from leak to growth to the critical fracture size — is long enough for the monitoring system to detect it and act.</p>