Ductile tearing simulation of STS410 pipe fracture test under load-controlled large-amplitude cyclic loading: Part I—Effect of load ratio

• Published in: Engineering fracture mechanics 2020-03, Vol.226, p.106869, Article 106869
• Main Authors: Hwang, Jin-Ha, Youn, Gyo-Geun, Kim, Hune-Tae, Kim, Yun-Jae, Miura, Naoki
• Format: Article
• Language: English
• Subjects: Amplitudes; Computer simulation; Cyclic hardening model effect; Cyclic loads; Damage assessment; Ductile fracture; Ductile fracture simulation; Fracture testing; Hardening; Large-amplitude cyclic loading; Load ratio effect; Pipe tests; Tensile tests; Through-wall cracked pipe
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2020.106869

•Ductile tearing simulation under cyclic loading is compared with of STS410 pipe test.•Cracked pipe test is performed under large-amplitude load-controlled cyclic loading.•Cyclic loading consists of three different load ratios with the same maximum load.•FE simulation using a multi-axial fracture strain energy damage model is performed.•The damage model is determined from tensile test and one monotonic loading pipe test.•The effect of the cyclic hardening model on cyclic loading simulation is discussed. Ductile fracture of circumferential through-wall cracked pipe under large-amplitude load-controlled cyclic loading with three different load ratios was simulated using a fracture strain energy damage model. Damage model parameters were determined from a tensile test and a pipe test under monotonic loading. Comparison of simulated and experimental data reveals that the simulation results depend on the cyclic hardening model. Further investigation confirmed that selection of an appropriate cyclic hardening model is more important under load-controlled cyclic loading then under displacement-controlled one.