Material hardness at strain rates beyond 10⁶ s^–1 via high velocity microparticle impact indentation

Journal Article · Fri Nov 01 00:00:00 EDT 2019 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2019.10.032· OSTI ID:1658601

Hassani, Mostafa ^[1]; Veysset, David ^[2]; Nelson, Keith A. ^[2]; Schuh, Christopher A. ^[2]

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1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Cornell Univ., Ithaca, NY (United States); Massachusetts Institute of Technology
2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Despite advances in mechanical testing at small scales and testing at high strain rates, studies of mechanical behavior of materials remain largely qualitative in the regimes where these two conditions overlap. In this work, we present an approach based on microparticle impact indentation to determine material hardness at micron scales and at high strain rates. We employ laser ablation to impact ceramic alumina microparticles (as indenter) onto two model materials, namely copper and iron. We use real time measurements of impact and rebound velocities together with post- impact measurements of indentation volume to determine material hardness at strain rates beyond 10⁶ s^–1.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: National Science Foundation (NSF); US Army Research Laboratory (USARL); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
• Grant/Contract Number: SC0018091
• OSTI ID: 1658601
• Alternate ID(s): OSTI ID: 1574053
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Vol. 177; ISSN 1359-6462
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Hardness
High Strain Rate
Impact
Indentation