Research Papers

Effect of High Strain Rate on Indentation in Pure Aluminum

[+] Author and Article Information
Hiroyuki Yamada

e-mail: ymda@nda.ac.jp

Nagahisa Ogasawara

e-mail: oga@nda.ac.jp

Yoko Shimizu

Graduate Student
e-mail: em50015@nda.ac.jp
School of Systems Engineering,
National Defense Academy,
1-10-20 Hashirimizu,
Yokosuka Kanagawa, 239-8686, Japan

Keitaro Horikawa

Associate Professor
e-mail: horikawa@me.es.osaka-u.ac.jp

Hidetoshi Kobayashi

e-mail: hkoba@me.es.osaka-u.ac.jp
Graduate School of Engineering Science,
Osaka University,
1-3 Machikaneyama Toyonaka Osaka, 560-8531,

Xi Chen

International Center for Applied Mechanics,
SV Lab, School of Aerospace,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: xi.chen@mail.xjtu.edu.cn

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 17, 2012; final manuscript received October 4, 2012; published online March 25, 2013. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 135(2), 021010 (Mar 25, 2013) (5 pages) Paper No: MATS-12-1147; doi: 10.1115/1.4023778 History: Received June 17, 2012; Revised October 04, 2012

The indentation properties of pure aluminum (99.9%, 3N aluminum) and high purity aluminum (99.999%, 5N aluminum) with respect to the strain rate dependence of strength are experimentally investigated in order to clarify the effect of strain rate on the micro-indentation test. A micro-indentation test using a Berkovich indenter was performed at loading rates of 0.7, 7, and 70 mN/s. In all of the specimens, the indenter was loaded to a maximum value of 1200 mN, and then was maintained for 30 s. In the 3N specimen, the dependence of the loading rate on the load was slight at loading rates of 0.7 and 7 mN/s, whereas the load at the loading rate of 70 mN/s was higher than the loads at loading rates of 0.7 and 7 mN/s. On the other hand, the load for the 5N specimen increased with the increasing loading rate. Thus, the effect of the loading rate on the load-displacement curve for the 3N and 5N specimens was similar to the strain rate dependence of strength for theses metals. In addition, the micro-indentation test was demonstrated to be strongly affected by high strain rate at a loading rate of 70 mN/s.

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Fig. 1

Load-displacement curves obtained through a micro-indentation test and FEM analysis (static and dynamic) for pure copper at a loading rate of 70 mN/s

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Fig. 2

Setup of the SHPB compression test (unit: mm)

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Fig. 3

Configuration of the Berkovich indenter

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Fig. 4

True stress-strain curves for 3N and 5N aluminum in the QS test and the impact test

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Fig. 5

Load-displacement curves for 3N and 5N aluminum in the indentation test

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Fig. 6

Loading curvature-displacement relationship for 3N and 5N aluminum in the indentation test

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Fig. 7

Relationship between displacement during holding time at maximum load and loading rate for 3N and 5N aluminum in the indentation test

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Fig. 8

Effect of strain rate on true stress at each true strain in 3N and 5N aluminum




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