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

SCRIPTA MATERIALIA

卷:177

Article

Hassani, Mostafa^1,2  Veysset, David³  Nelson, Keith A.^3,4  Schuh, Christopher A.¹ 

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA

[3] MIT, Inst Soldier Nanotechnol, Cambridge, MA 02139 USA

[4] MIT, Dept Chem, Cambridge, MA 02139 USA

关键词: Hardness;    Impact;    Indentation;    High strain rate;   

DOI  :  10.1016/j.scriptamat.2019.10.032

来源: Elsevier

【 摘 要 】

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. Here, 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 micropartides (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 10(6) s(-1). (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free