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.

References

References
1.
Cheng
,
Y. T.
, and
Cheng
,
C. M.
,
2004
, “
Scaling, Dimensional Analysis, and Indentation Measurements
,”
Mater. Sci. Eng.
,
R44
, pp.
91
149
.10.1016/j.mser.2004.05.001
2.
Gouldstone
,
A.
,
Chollacoop
,
N.
,
Dao
,
M.
,
Li
,
J.
,
Minor
,
A. M.
, and
Shen
,
Y.-L.
,
2007
, “
Indentation Across Size Scales and Disciplines: Recent Developments in Experimentation and Modeling
,”
Acta Mater.
,
55
, pp.
4015
4039
.10.1016/j.actamat.2006.08.044
3.
Ogasawara
,
N.
,
Chen
,
X.
, and
Chiba
,
N.
,
2006
, “
Limit Analysis-Based Approach to Determine the Material Plastic Properties With Conical Indentation
,”
J. Mater. Res.
,
21
, pp.
947
957
.10.1557/jmr.2006.0108
4.
Doerner
,
M. F.
, and
Nix
,
W. D.
,
1986
, “
A Method for Interpreting the Data From Depth-Sensing Indentation Instruments
,”
J. Mater. Res.
,
1
, pp.
601
609
.10.1557/JMR.1986.0601
5.
Harsono
,
E.
,
Swaddiwudhipong
,
S.
,
Li
,
Z. S.
, and
Shen
,
L.
,
2011
, “
Numerical and Experimental Indentation Tests Considering Size Effects
,”
Int. J. Solids Structures
,
48
, pp.
972
978
.10.1016/j.ijsolstr.2010.12.002
6.
Yamada
,
H.
,
Shimizu
,
Y.
,
Ogasawara
,
N.
, and
Chen
,
X.
,
2012
, “
Effect of Strain Rate on Load-Displacement Relations by Instrumented Sharp Indentation
,”
J. Jpn. Soc. Exp. Mech.
,
12
, pp.
88
93
.
7.
Cowper
,
G. R.
, and
Symonds
,
P. S.
,
1958
, “
Strain Hardening and Strain Rate Effects in the Impact Loading of Cantilever Beams
,”
Applied Mathematics Report
,
Brown University
,
Providence, RI
, pp.
1
46
.
8.
Ogasawara
,
N.
,
Kuramochi
,
C.
,
Makiguchi
,
W.
, and
Chiba
,
N.
,
2003
, “
Influence of Affected Layer for Micro-Indentation Tests
,”
Trans. JSME A
,
69
, pp.
805
811
.10.1299/kikaia.69.805
9.
Kolsky
,
H.
,
1949
, “
An Investigation of the Mechanical Properties of Materials at Very High Rates of Loading
,”
Proc. Phys. Soc. B
,
62
, pp.
676
700
.10.1088/0370-1301/62/11/302
10.
Hopkinson
,
B.
,
1914
, “
A Method of Measuring the Pressure in the Deformation of High Explosives by the Impact of Bullets
,”
Philos. Trans. R. Soc., London, Ser. A,
213
, pp.
437
452
.10.1098/rsta.1914.0010
11.
Ogawa
,
K.
,
2001
, “
Impact Tensile Characteristics of 6061-T6 Aluminum Alloy
,”
J. Jpn. Inst. Light Metals
,
51
, pp.
175
181
.10.2464/jilm.51.175
12.
Ogawa
,
K.
,
2001
, “
Impact Tensile Strength of 6061-O Aluminum Alloy
,”
J. Jpn. Inst. Light Metals
,
52
, pp.
131
135
.10.2464/jilm.52.131
13.
Ogawa
,
K.
,
Kobayashi
,
H.
,
Sugiyama
,
F.
, and
Horikawa
,
K.
,
2005
, “
Prediction of Mechanical Behaviour of Low Carbon Steel at High Strain Rate Using Thermal Activation Theory and Static Data
,”
JSME Int. J. A.
,
48
, pp.
228
233
.10.1299/jsmea.48.228
14.
Johnson
,
W.
,
1972
,
Impact Strength of Materials
,
Edward Arnold
,
London
.
15.
Holt
,
D. L.
,
Babcock
,
S. G.
,
Green
,
S. J.
, and
Maiden
,
C. J.
,
1967
, “
The Strain-Rate Dependence of the Flow Stress in Some Aluminum Alloys
,”
Trans. ASM
,
60
, pp.
152
159
.
16.
Goodall
,
R.
, and
Clyne
,
T. W.
,
2006
, “
A Critical Appraisal of the Extraction of Creep Parameters From Nanoindentation Data Obtained at Room Temperature
,”
Acta Mater.
,
54
, pp.
5489
5499
.10.1016/j.actamat.2006.07.020
17.
Sakaue
,
K.
,
Okazaki
,
S.
, and
Ogawa
,
T.
,
2009
, “
Evaluation of Viscoelastic Characteristics by Indentation Technique and Application of Time-Temperature Superposition Principle
,”
Trans. JSME A
,
75
, pp.
1045
1050
.
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