The indentation process of pressing a Rockwell diamond indenter into inelastic material has been studied to provide a means for the analysis, simulation and prediction of Rockwell hardness tests. The geometrical characteristics of the spheroconical-shaped Rockwell indenter are discussed and fit to a general function in a self-similar way. The complicated moving boundary problem in Rockwell hard...

Microstructure characterization of 316L deformed at high strain rates using EBSD. Access to the published version may require subscription. a b s t r a c t a r t i c l e i n f o Specimens from split Hopkinson pressure bar experiments, at strain rates between ~1000–9000 s −1 at room temperature and 500 °C, have been studied using electron backscatter diffraction. No significant differences in th...

Non-equilibrium molecular dynamics simulations have been used to investigate strain-rate dependence of plasticity and phase transition in [001]-oriented single-crystal iron under ramp compression. Here, is governed by deformation twinning, which kinetics tightly correlated with the loading rate. Over investigated range strain rates, a hardening-like effect found shift onset structural bcc-to-hc...

Finite element analysis, of regular Kelvin foam models with all the material in uniform-thickness faces, was used to predict the compressive impact response of low-density closed-cell polyethylene and polystyrene foams. Cell air compression was analysed, treating cells as surface-based fluid cavities. For a typical 1 mm cell size and 50 s impact strain rate, the elastic buckling of cell faces, ...

Dynamic pore collapse in porous materials is studied by analyzing the finite deformation of an elastic/viscoplastic spherical shell under impulsive pressure loading. Effects of dynamic loading rate, pore size, initial porosity, strain-rate sensitivity, strain hardening, thermal softening, and mass density of the matrix material on the pore collapse process are examined and results are compared ...

We use Bai’s conservation equation for cracks, and Rice and Tracey’s equation for the growth of a spherical void in an infinite medium to derive an evolution equation for damage in an anisotropic material. It is then used to delineate the instability strain in a thin anisotropic sheet deformed in a plane stress state of deformation, and obeying Hill’s yield criterion. Assuming that strainand st...

Very high strain hardening coefficients (=G/23) are observed for aluminum-alloyed face-centered cubic Hadfield steel single crystals under tensile loading. Alloying with aluminum suppressed deformation twinning in two of the three crystallographic orientations studied, and transmission electron microscopy results revealed the existence of dense dislocation walls (sheets) along crystallographic ...

In order to explore the evolution of physical and mechanical properties acoustic emission (AE) characteristics aluminum foam under fatigue quasi-static compression from a microscopic point view, AE monitoring technology was used analyze deformation, hardening, energy absorption open-cell at different rates (2, 10 50 mm/min) loading tests with peak stress ratios k (k = maximum stress/yield stres...