Experimental study on deformation evolution and fracture behaviors of pure titanium at different stress triaxialities

•The deformation and fracture behaviors of pure titanium are investigated by DIC.•The features of the localized region (LR) are quantitatively identified.•The damage and failure of pure titanium is highly dependent on the stress states. In this study, the deformation and fracture behaviors of pure t...

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Bibliographic Details
Published in:Engineering fracture mechanics 2021-12, Vol.258, p.108127, Article 108127
Main Authors: Zhang, Hao, Li, Xunpeng, Gao, Tao, Song, Haipeng, Huang, Ganyun
Format: Article
Language:English
Subjects:
Axial stress
Coalescing
Deformation
Deformation evolution
Digital image correlation
Digital imaging
Evolution
Fracture behavior
Fracture surfaces
Metal sheets
Necking
Nucleation
Pure Titanium
Strain distribution
Strain localization
Stress triaxiality
Titanium
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Summary:•The deformation and fracture behaviors of pure titanium are investigated by DIC.•The features of the localized region (LR) are quantitatively identified.•The damage and failure of pure titanium is highly dependent on the stress states. In this study, the deformation and fracture behaviors of pure titanium sheet specimens under different stress triaxialities are experimentally investigated. Digital image correlation (DIC) technique is used to determine the strain maps on the surface of the specimens during the deformation and failure process. The experimental results show clearly that the strain localization occurs in different specimens which leads to the formation of the crack in the localized region (LR). The characteristics of the LR are quantitatively identified by the strain distribution along axial and transverse directions, the evolution of effective strain is successfully used to obtain the strains of diffuse necking, local necking and strain at fracture. The fracture features of the specimens with different stress triaxialities are studied by the analysis of fracture surface morphology. The nucleation and growth of micro-voids in pure titanium is significantly dependent on the applied stress conditions. The slip mechanism dominates the failure of shear specimens. For tensile loading conditions, the higher stress triaxiality accelerates the growth and coalescence of micro voids which induce the decrement of fracture strain.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2021.108127