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Abstract Dynamic and quasi-static compression experiments are conducted on a high-density porous titanium with in situ X-ray imaging to characterize its deformation dynamics. The porous titanium exhibits higher strain-rate sensitivity… Click to show full abstract
Abstract Dynamic and quasi-static compression experiments are conducted on a high-density porous titanium with in situ X-ray imaging to characterize its deformation dynamics. The porous titanium exhibits higher strain-rate sensitivity than full-density titanium. Strain field mapping indicates that compaction bands are narrower and denser under dynamic loading, leading to a more homogeneous strain distribution and thus a higher flow stress. The mean Poisson’s ratio for dynamic loading is 15% lower than that for quasi-static loading at the same bulk strain, as a result of local inertial confinement which also contributes to the rate hardening of porous titanium.
Journal Title: Materials Letters
Year Published: 2019
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