In-situ digital image correlation for fracture analysis of oxides formed on zirconium alloys

Peridynamic simulations of the tetragonal to monoclinic phase transformation in zirconium dioxide

“…with very few or no grain boundaries and defects in the surrounding oxide. This is more comparable with the fracture strains and stresses obtained applying DIC to thin oxide layers on ZIRLO TM with smaller grains and defects (Platt et al, 2016), rather than those defined for manufactured stabilised zirconia containing larger grains and defects (Eichler et al, 2007(Eichler et al, , 2004Noguchi and Fujita, 1989). …”

“…This study tested four critical fracture strains defined as 0.00711, 0.00553, 0.00395 and 0.00237, which gives fracture stresses of 1.8 GPa, 1.4 GPa, 1 GPa and 600 MPa. These values are based on the fracture stresses and strains defined for manufactured stabilised zirconia (Eichler et al, 2007(Eichler et al, , 2004Noguchi and Fujita, 1989), and values obtained for zirconia formed as an oxide layer on ZIRLO TM (Platt et al, 2016). After a truss element has reached S 0 , and failed, the elastic modulus of the truss becomes negligible (E = 1 x 10 -6 MPa).…”

A High Resolution Digital Image Correlation Study under Multiaxial Loading

“…The implementation in an SEM allows performing in-situ deformation studies while undertaking high-resolution digital image correlation (HRDIC). The latter provides full-field displacement maps at high magnification upon deformation and has been successfully employed for studying deformation mechanisms, strain partitioning and crack propagation under uniaxial loading tests using dogbone-shaped samples [19][20][21][22][23][24][25][26][27]. A flat cruciform geometry has been used in combination with HRDIC to investigate the martensitic transformation of superelastic NiTi in [11], where it was seen that the flat geometry can be used for performing uniaxial and strain path changes, but it does not allow reaching high plastic strains at the center of the sample under equibiaxial loading.…”

Unraveling different influences of the fraction of the tetragonal phase in oxide films on the corrosion resistance of Zr alloys from the phase transition mechanism

“…Since the micro-cracks usually accompany the t-m transition, how the tensile stress produced by a phase transition with the total expansion of volume from the t to m phase attracts much attention. [69][70][71][72] Using the finite element (FE) method, Plat et al 69 demonstrated that shear tensile stress can be produced in such a transition by supposing that the expansion in the lattice volume from the t-m phase is microscopic isotropy. They also studied the formation of micro-cracks in oxide films by using the FE method.…”