Ductile fracture behaviour under Mode I loading using Rousellier Ductile Damage Theory

The aim of this study is to investigate the ductile fracture behaviour unde r Mode I loading using SA533B pressure vessel steel. Experiments consist of the Round Notch Bar Test (RNB), Single Edge Crack Bending Test (SECB), and V-Notch Bar Test (VNB). Results from the RNB test were used to tune the da mage modelling constant. The other tests were performed to acquire the J-re sistance curves and to confirm the damage constants. Microstructural observ ation includes the measurement of crack profile to obtain the roughness par ameter. Finally, simulation using Rousellier Ductile Damage Theory (RDDT) w as carried out with 4-node quadrilateral element (L-c=0.25 mm). For the cra ck advance, the failed element removal technique was adopted with a beta cr iterion. In conclusion, the predicted simulation using RDDT showed a good a greement with the experimental results. A trial using a roughness parameter was made for a new evaluation of J-resistance curve, which is more conserv ative than the conventional one.