The influence of inertial, thermal, and rate-sensitive effects on the void growth at high strain rate in a thermal-viscoplastic solid is investigated by means of a theoretical model proposed in the present paper. Numerical analysis of the model suggests that inertial, thermal, and rate-sensitive effects are three major factors which greatly influence the behavior of the void growth in porous ductile materials in high strain rate case. One and two-dimensional plate-impact tests of mild steel are performed. Microscopic observations of the softly recovered specimens reveal the mechanism of micro-damage. As an application of the theoretical model, the processes of one and two dimensional spallation in mild steel are successfully simulated by a finite-difference Lagrangian dynamic code in which the mathematical model presented in this paper is incorporated.

1.
Beyer, R. T., and Ring, E. M., 1972, Liquid Metals, S. Z. Beer, ed., p. 431.
2.
Carroll
M. M.
,
Kim
K. T.
, and
Nesterenko
V. R.
,
1986
, “
The Effect of Temperature on Viscoplastic Pore Collapse
,”
J. Appl. Phys.
, Vol.
59
, pp.
1962
1967
.
3.
Chhabildas
L. C.
, and
Asay
J. R.
,
1979
, “
Rise-Time Measurements of Shock Transitions in Aluminum, Copper, and Steel
,”
J. Appl. Phys.
, Vol.
50
, pp.
2749
2756
.
4.
Cortes
R.
,
1992
, “
The Growth of Microvoids Under Intense Dynamic Loading
,”
Int. J. Solids Struct.
, Vol.
29
, pp.
1339
1350
.
5.
Curran
D. R.
,
Shockey
D. A.
, and
Seaman
L.
,
1973
, “
Dynamic Fracture Criteria for a Polycarbonate
,”
J. Appl. Phys.
, Vol.
44
, pp.
4025
4038
.
6.
Curry
D. A.
, and
Knott
J. F.
,
1979
, “
Effect of Microstructure on Cleavage Fracture Toughness of Quenched and Tempered Steels
,”
Metall. Sci.
, Vol.
13
, pp.
341
345
.
7.
Grady
D. E.
,
1988
, “
The Spall Strength of Condensed Matter
,”
J. Mech. Phys. Solids
, Vol.
36
, pp.
353
384
.
8.
Gurson
A. L.
,
1977
, “
Continuum Theory of Ductile Rupture by void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
,”
ASME JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY
, Vol.
99
, pp.
2
15
.
9.
Johnson
J. N.
,
1981
, “
Dynamic Fracture and Spallation in Ductile Solids
,”
J. Appl. Phys.
, Vol.
52
, pp.
2812
2825
.
10.
Johnson, W., and Mellor, P. B., 1973, Engineering Plasticity, Van Nostrand Reinhold, London.
11.
Meyers
M. A.
, and
Aimone
C. T.
,
1983
, “
Dynamic Failure (spalling) of Metals
,”
Prog. Mater. Sci.
, Vol.
28
, pp.
1
96
.
12.
Seaman, L., T. W. Barbee, Jr., and Curran, D. R., Stanford Res. Inst. Tech. Report No. AFWL-R-71-156, Dec. 1971 (unpublished).
13.
Taylor
G. J.
, and
Quinney
H.
,
1934
, “
The Latent Energy Remaining in a Metal After Cold Working
,”
Proc. R. Soc. London
, Vol.
143A
, pp.
307
326
.
14.
Tvergaard
V.
, and
Needleman
A.
,
1993
, “
An Analysis of the Brittle-Ductile Transition in Dynamic Crack Growth
,”
Int. J. Fract.
, Vol.
59
, pp.
53
67
.
15.
Wang
Ze-Ping
,
Huang
F. L.
,
Hou
M.
,
Yun
S. R.
, and
Ding
J.
,
1993
, “
Description of Two-Dimensional Spallation in Pure Copper
,”
Int. J. Fract.
, Vol.
60
, pp.
195
208
.
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