Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
Steel and Composite Structures Volume 47, Number 2, April25 2023 , pages 289-296 DOI: https://doi.org/10.12989/scs.2023.47.2.289 |
|
|
Failure analysis of tubes under multiaxial proportional and non-proportional loading paths |
||
Mohammad Hossein Iji and Ali Nayebi
|
||
Abstract | ||
The failure of a thin-walled tube was studied in this paper based on three failure models. Both proportional and nonproportional loading paths were applied. Proportional loading consisted of combined tension-torsion. Cyclic non-proportional loading was also applied. It was a circular out-of-phase axial-shear stress loading path. The third loading path was a combination of a constant internal pressure and a bending moment. The failure models under study were equivalent plastic strain, modified Mohr-Coulomb (Bai-Wierzbicki) and Tearing parameter models. The elasto-plastic analysis was conducted using J2 criterion and nonlinear kinematic hardening. The return mapping algorithm was employed to numerically solve the plastic flow relations. The effects of the hydrostatic stress on the plastic flow and the stress triaxiality parameter on the failure were discussed. Each failure model under study was utilized to predict failure. The failure loads obtained from each model were compared with each other. The equivalent plastic strain model was independent from the stress triaxiality parameter, and it predicted the highest failure load in the bending problem. The modified Mohr-Coulomb failure model predicted the lowest failure load for the range of the stress triaxiality parameter and Lode's angle. | ||
Key Words | ||
bending; ductile failure models; kinematic hardening; non-proportional loading; thin-walled tube; Torsion | ||
Address | ||
Mohammad Hossein Iji and Ali Nayebi:Mechanical Engineering School, Shiraz University, Shiraz, Iran | ||