Anisotropic ductile failure in titanium alloy at quasi-static and high strain rates

Mir, Arash; Barton, D.C.; Andrews, T.; Church, P.

doi:10.1051/jp4:20030754

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At high rates of loading, the plain (unnotched) specimens indicated the same degree of anisotropy of fracture strain as for the quasi-static tests. The mean failure strains in the two directions of loading were somewhat higher than the corresponding quasi-static values, a trend that has also been observed for other materials, e.g., titanium alloy (Mir et al, 2003). However the titanium differed from the FMS in that no distinct second phase inclusions were apparent in its microstructure and therefore the fracture anisotropy is more difficult to interpret.…”

Section: Discussionmentioning

confidence: 65%

Anisotropic ductile failure in free machining steel at quasi-static and high strain rates

et al. 2005

Self Cite

View full text Add to dashboard Cite

Leaded Free Machining Steel (FMS) specimens were tested in tension at quasi-static and high strain rates in both the longitudinal and transverse directions with respect to the axis of the bar material. For the quasi-static tests, a high degree of anisotropy of fracture behaviour was observed for both plain (unnotched) and notched specimens. However the difference in fracture strains for longitudinal and transverse directions was significantly reduced for the high stress triaxiality conditions produced by the sharper notches. Plain specimens tested at dynamic strain rates (10 3 s −1 ) failed at somewhat higher strains than those tested quasi-statically. For the notched specimens tested dynamically, there was a transition to a brittle mode of failure and there was no statistically significant anisotropy in the very low strains to failure recorded. These experimental results were linked to numerical predictions of the local stress, strain and strain rate conditions in the specimens carried out using a modified Armstrong-Zerilli constitutive model for the FMS. Changes in the percentage area and aspect ratio of the lead inclusions which act as sites for void growth under ductile failure conditions were measured for both longitudinal and transverse directions of loading. It was found that the apparent area of inclusions increases with degree of deformation due to void growth but that the aspect ratio decreases due to the inclusions/voids becoming more spherical. This effect was greater for loading in the transverse direction indicating that voids grow more readily from inclusions when the latter are aligned perpendicular to the direction of loading.

show abstract

Section: Discussionmentioning

confidence: 65%