Estimation Procedure of J-resistance Curves for Through Wall Cracked Steam Generator Tubes

Failure Assessment Diagram in Structural Integrity Analysis of Steam Generator Tubes

“…Besides the few experimental data in literature, the testing techniques reported present some difficulties that must be resolved so then can be reliable, Bergant et al (2012). These techniques should include fracture toughness resistance curves tests for circumferential and longitudinal cracks in actual SGTs, particularly in terms of elastic-plastic fracture mechanics parameters as the J-integral or CTOD.…”

“…It is particularly interesting the difference between the fracture toughness values reported in Bergant et al (2012) and in Samal (2012 and2013). Although both studies were carried on with similar material (i.e., annealed Incoloy 800 with almost equal tube geometry), very dissimilar values of fracture toughness were measured for longitudinal and circumferential cracks.…”

“…Readers interested in more details are requested to consult the original works, Huh et al (2006), Bergant et al (2012) and Samal (2012 and2013).…”

“…Table 2 presents the mechanical properties of the Inconel 600 SGTs, including the lower bound J-integral value for crack growth initiation. 3.2 J-resistance curves for Incoloy 800 SGTs with circumferential cracks, Bergant et al (2012) In a previous work, Bergant et al (2012) presented a non-standardized experimental technique for J-resistance curves estimation. Specimens were fabricated from straight parts of SGTs, with one and two opposite circumferential TWCs, and were tested in pure tension at room temperature.…”

“…FAD assessments for (a) circumferential cracks in a tube loaded in tension and Jq = 717 kJ/m 2(Bergant et al, 2012); (b) longitudinal cracks in a tube under internal pressure and Jq = 250 kJ/m 2Samal, 2012 and2013).…”