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The paper concerns processes of high-speed compaction of nanosized powders. The
processes of uniform and uniaxial compaction have been simulated by the granular dynamics
method. Nanoparticles interaction, in addition to known contact laws, includes dispersive
attraction, formation of a strong interparticle bonding as well as the forces caused by viscous
stresses in the contact region. For different densification rates, the densification curves
(pressure vs. density) have been calculated. Relaxation of the stresses after the compression
stage has been analyzed. The densification curves analysis allows us to suggest the
dependence of compaction pressure as a function of strain rate in the form of ρ ∝ ν1/8. The
rate dependence obtained has been applied for interpretation of experimental data concerning
high-speed processes of magnetic pulsed compaction of nanopowders.
Keywords: nanosized powders, granular dynamics method, high-speed compaction |
full paper (pdf, 1040 Kb)