PSI - Issue 66

Miloslav Kepka Jr. et al. / Procedia Structural Integrity 66 (2024) 135–141 Miloslav Kepka Jr. et al / Structural Integrity Procedia 00 (2025) 000 – 000

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dĞƐƚ ƐĂŵƉůĞƐ ǁŝƚŚ ƌĞƉĂŝƌ ǁĞůĚƐ dŽƚĂů ŽĨ ϲ ƐĂŵƉůĞƐ ǁŝƚŚ ĚŝŵĞŶƐŝŽŶƐ ŽĨ ϳϬϬ dž ϭϬϬ dž ϴϬ ŵŵ &ĂƚŝŐƵĞ ƚĞƐƚ ǁŝƚŚ ϰͲƉŽŝŶƚ ďĞŶĚŝŶŐ͖ ^ƚƌĞƐƐ ƌĂŶŐĞ ϭϯϬ DWĂ ;Z с Ϭ͘ ϭͿ WĂƌĞŶƚ ŵĂƚĞƌŝĂů͗ ^ϯϱϱE> ƐƚƌƵĐƚƵƌĂů ƐƚĞĞů ƌĂĐŬƐ ĨƌŽŵ ƉƌĞǀŝŽƵƐ ůŽĂĚŝŶŐ ǁĞƌĞ ŐƌŽƵŶĚ ĚŽǁŶ ĂŶĚ ǁĞůĚĞĚ͘ dŚĞ ,&D/ ŵĞƚŚŽĚ ǁĂƐ ĂƉƉůŝĞĚ ƚŽ ϯ ƐĂŵƉůĞƐ ŽĨ ϲ͘

ƐǁĞůĚĞĚ

,&D/

ϰϯϯϭϱϯ

ϭϬ ϬϬϬ ϬϬϬ ;ƌƵŶ ŽƵƚͿ

ϭϴϬϲϰϳϮ ϭϬ ϬϬϬ ϬϬϬ ;ƌƵŶ ŽƵƚͿ ϭϬ ϬϬϬ ϬϬϬ ;ƌƵŶ ŽƵƚͿ ϭϬ ϬϬϬ ϬϬϬ ;ƌƵŶ ŽƵƚͿ

Fig. 7. Photos of the weld repair process and fatigue test results.

A key finding from this pilot verification was that the fatigue life of repair welds can be significantly extended by applying HFMI. That is why subsequent internal research was devoted to this issue in more detail. 4. Internal Research in the Regional Technological Institute Work [4] was focused on the research of repair welds on a bent T-specimen with fillet welds. The set-up of the experimental program and its results provide the information shown in Fig. 8 and 9.

dĞƐƚŝŶŐ ŽĨ ƌĞƉĂŝƌ ǁĞůĚƐ ŽŶ Ă dͲƐƉĞĐŝŵĞŶ ǁŝƚŚ ĨŝůůĞƚ ǁĞůĚƐ WĂƌĞŶƚ ŵĂƚĞƌŝĂů͗ ^ϰϲϬD ƐƚƌƵĐƚƵƌĂů ƐƚĞĞů

ϭϮ ƐĂŵƉůĞƐ ŽĨ ƚŚŝĐŬŶĞƐƐ ϭϱ ŵŵ ^ƉŽƚ ǁĞůĚŝŶŐ – ZŽŽƚ ůĂLJĞƌ – ŽǀĞƌ ůĂLJĞƌ – ^ĂŵƉůĞ ĐƵƚƚŝŶŐ

• ŽŶƐƚĂŶƚ ůŽĂĚ ƌĂŶŐĞ ∆F ĐŽŶƚƌŽůůĞĚ ďLJ ƚŚĞ ĂƉƉůŝĞĚ ĨŽƌĐĞ & • ^ƚƌĞƐƐ ƌĂƚŝŽ ≐ Ϭ͘ ϭϳ͕ ϭϬ,nj • ,ŽƚͲƐƉŽƚ ƐƚƌĞƐƐ ĞǀĂůƵĂƚŝŽŶ • ƌŝƚĞƌŝŽŶ͗

ŵĂĐƌŽ ĐƌĂĐŬ ŝŶ ƚŚĞ ǁĞůĚ ƚŽĞ͕ ŝĚĞŶƚŝĨŝĞĚ ďLJ ůŽƐƐ ŽĨ ƐƚŝĨĨŶĞƐƐ ;ĚĞĨŽƌŵĂƚŝŽŶ ŽĨ ƚŚĞ ƐĂŵƉůĞͿ

Fig. 8. The process of producing test samples and loading them until the formation of fatigue macro-cracks.