Metal Foams: A Design Guide

162 Metal Foams: A Design Guide
Stress (MPa)
16
14
12
10
8
6
4
2
0
0
Dynamic 3609 /s
Quasi−static
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Strain
Figure 11.11 Stress–strain curves for Alulight foam with a relative density
of 0.18 at two strain rates: 3.6 ð 10 3 /s and 3.6 ð 10 C3 /s (Deshpande and
Fleck, 2000)
MPa
σ/(ρ/ρ s ) 1.5
10
90
−6 10−4 10−2 Velocity m/s
80
70
60
50
40
30
Strain rate/s
10 0 10 2
20
10
0
10−4 10−2 100 102 104 Alulight
ERG
Figure 11.12 The plateau stress corrected for relative density, plotted
against strain rate. It is essentially independent of strain rate up to
3.6 ð 10 C3 /s (Deshpande and Fleck, 2000)