PSI - Issue 14

Filin V.Yu. et al. / Procedia Structural Integrity 14 (2019) 758–773 Author name / Structural Integrity Procedia 00 (2018) 000–000

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a b Figure 6 – FEM calculated constraint ahead a crack tip (with coordinates 0, 0). ( a ) mid-thickness, ( b ) quarter thickness

Figure 7 – J-integral for welded specimens notched at fusion line. ( a ) FCAW, low heat input, ( b ) SAW, high heat input. Horizontal line corresponds to a “standard” applicability criterion with SENB specimens. Constraint effect is defined as a difference of actual strain ratio σ 1 /σ i in the zone of fracture for a certain case from the same in SSY conditions, when the stress-strain state at the crack tip is determined by a single parameter ( K Ic or J c ). The maximum constraint takes place in the crack plane at the distance from the crack tip x = 2 J /σ Y = 2 m 