A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
New Model for Ductile Fracture of Metal Alloys. II: Reverse Loading
AbstractDuctile fracture of metals resulting from large amplitude inelastic reverse straining has been the predominant reason for the failure of structural components under extreme loadings. This kind of fracture, characterized by only a few reverse cycles with large precrack plastic strain, is often termed ultra-low cycle fatigue (ULCF). Ductile failure of metals has recently been recognized to be a function of stress triaxiality and Lode angle parameter. In this paper, a new fracture model with full consideration of stress triaxiality and Lode angle parameter as well as the cutoff regions is proposed from the extension of its equivalence for monotonic loading in the parallel paper. The underlying mechanism and determination of the cutoff region boundary is well-defined and discussed. Additionally, the effect of load excursion on shifting the boundary of the cutoff region and the subsequent damage evolution is assessed. The nonlinearity of damage evolution is also studied and well-characterized. The developed criterion is evaluated against data extracted from a series of multistress states cyclic experimental results, and excellent correlations between the proposed model and experimental results are achieved. Comparison between the proposed model and other existing models is made, and favorable results are shown for the proposed model. The presented model can be used for predicting the potential for ULCF failure in alloys.
New Model for Ductile Fracture of Metal Alloys. II: Reverse Loading
AbstractDuctile fracture of metals resulting from large amplitude inelastic reverse straining has been the predominant reason for the failure of structural components under extreme loadings. This kind of fracture, characterized by only a few reverse cycles with large precrack plastic strain, is often termed ultra-low cycle fatigue (ULCF). Ductile failure of metals has recently been recognized to be a function of stress triaxiality and Lode angle parameter. In this paper, a new fracture model with full consideration of stress triaxiality and Lode angle parameter as well as the cutoff regions is proposed from the extension of its equivalence for monotonic loading in the parallel paper. The underlying mechanism and determination of the cutoff region boundary is well-defined and discussed. Additionally, the effect of load excursion on shifting the boundary of the cutoff region and the subsequent damage evolution is assessed. The nonlinearity of damage evolution is also studied and well-characterized. The developed criterion is evaluated against data extracted from a series of multistress states cyclic experimental results, and excellent correlations between the proposed model and experimental results are achieved. Comparison between the proposed model and other existing models is made, and favorable results are shown for the proposed model. The presented model can be used for predicting the potential for ULCF failure in alloys.
New Model for Ductile Fracture of Metal Alloys. II: Reverse Loading
Mahmoud, Hussam (author) / Wen, Huajie
2016
Article (Journal)
English
New model for ductile fracture of metal alloys. II: reverse loading
| Online Contents | 2016
New Model for Ductile Fracture of Metal Alloys. I: Monotonic Loading
| Online Contents | 2016
New model for ductile fracture of metal alloys. I: monotonic loading
| Online Contents | 2016