The previous paper studied the effect of the internal stress distribution in specimen thickness on CTOD. The critical CTOD tends to decrease in consequence of the internal stress distribution in specimen thickness in case that secondary stress is tension mode toward the crack. In estimating the critical CTOD to brittle fracture in structural component with large residual stress distribution, it is important to take account of that secondary stress effect. This paper presents the effect of weld residual stress on critical CTOD to brittle fracture at lower shelf temperature of standard fracture toughness test. Using single edge notched bend (SENB) and single edge notched tension (SENT) specimens with/without residual stress, the fracture toughness tests have been conducted at -60 °C. The effect of weld residual stress on critical CTOD to brittle fracture depends on critical CTOD level. The critical CTOD with residual stress is calculated by the superposition of δ or stress intensity factor based on Dugdale model. Moreover, the δ on secondary stress derived from residual stress field scarcely affects constraint loss correction because the stress field from residual stress falls within the small scale yield condition.
The effect of weld residual stress on critical CTOD to brittle fracture at lower shelf temperature
Einfluss von Schweißnahtrestspannungen auf die kritische CTOD zu Sprödbruch bei Tieflagentemperatur
2013
7 Seiten, 15 Bilder, 1 Tabelle, 7 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Schweißnaht , Restspannung (mechanisch) , COD (Crack Opening Displacement) , Rissspitze , Sprödbruchverhalten , Spannungsverteilung (mechanisch) , kritischer Wert , Sekundärspannung , Bruchzähigkeit , Spannungsintensitätsfaktor , Bruchmechanik , Weibull-Verteilung , Stahlblech , Blechdicke , Unterpulverschweißen , Finite-Elemente-Analyse , Bruchflächenaussehen
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