Study of fracture resistance of a weldment with a propagating crack

Characterizations of material constraint effect for creep crack in center weldment under biaxial loading

“…The critical challenge on quantifying the stress field of crack tip in those welded components is that the crack tip field can be influenced by many factors such as material mismatch (Kumar et al 2014), weldment geometry (Zhou et al 2014), residual stress (Ren et al 2009) and loading state, e.g., biaxial loading (Wang 2012;Shlyannikov et al 2011;Shlyannikov et al 2014;Wang et al 2014). Those factors can lead to the variations of microstructure (Kulkarni et al 2020), stress level (Han et al 2015), fracture toughness (Hemer et al 2020) as well as crack growth rate (Krishnan et al 2018;Alves et al 2020;Velu 2018) for the weldment, among which fracture toughness is an crucial fracture parameter to be determined as it can affect the border of failure assessment diagram which has been widely used as the evaluation tool by the industrial field (Dai et al 2020a). Note that the fracture toughness is always related to the so-called ''constraint effect.…”