Jun Sun

TL;DR: In this article, the micro-mechanisms of void coalescence at different stress triaxiality levels were investigated employing axisymmetrical smooth and notched tension specimens of spheroidized 37Mn5 steel.

TL;DR: In this article, a new elastic-plastic fracture parameter, J VC = J IC · f(σ m / \ gs), is proposed and proven to be a materials constant independent of the types of specimens geometries.

TL;DR: For three-point-bend specimens with different crack-depth in 50D steel, the principal reasons leading to the losing of J-dominance and the crackdepth dependence of Ji, were discovered by FEM calculations and experiments as discussed by the authors.

TL;DR: In this article, the validity of J- dominance in crack tip regions of different specimen geometries has also been analyzed, and it is found that the mutual relation between the constraint intensity-stress triaxiality in a crack tip field of real specimens and that of HRR field, is a decisive factor for that whether J dominance is valid or not.

TL;DR: In this article, the critical values of J- integral at initiation were independent of specimen geometries and crack depths and can be considered as the material constants, while the stress-strain fields in the crack tips of various specimens with different crack depths were in better agreement with the HRR solution in the plane stress case.