Hetal’s paper was published at Scripta Materialia! Congratulations!

Hetal D. Patel, Seok-Woo Lee, “Spherical indentation on tungsten single crystal: transition from source-controlled plasticity to bulk plasticity,” Scripta Materialia, 175, 16-19 (2019) [PDF] [web]  – Hetal D. Patel (undergraduate student)

Hetal has worked at the Lee group nearly for her entire undergraduate time, and finally got a publication! She recently started her PhD degree at MSE in UC Berkeley. I wish Hetal a success!

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ABSTRACT

Spherical nanoindentation was performed on tungsten single crystal to investigate the effects of tip radius on the pop-in stress. The results show that the pop-in stress decreases as the tip radius increases. A statistical model with randomly distributed dislocation sources captures experimentally observed source-controlled indentation size effect. The discrepancy between model and experimental data especially for a large tip was corrected by considering the collective activation of multiple dislocation sources. Our results provide a quantitative insight into the understanding of the transition from source-controlled plasticity to bulk plasticity under spherical nanoindentation.