Metal Foams: A Design Guide

48 Metal Foams: A Design Guide
Electrical properties
The only electrical property of interest is the resistivity, R. This scales with
relative density approximately as
� � r
R ³ Rs
⊲4.5⊳
with r D 1.6 1.85.
s
4.3 Foam property charts
Figures 4.6–4.11 are examples of material property charts. They give an
overview of the properties of metal foams, allow scaling relations to be
deduced and enable selection through the use of material indices (Chapter 5).
All the charts in this Guide were constructed using the CES (1999) software
and database.
Young's modulus (GPa)
100
10
1
0.1
Youngs modulus
vs. Density
Alulight (1)
Alulight (0.95)
Manual1.CMS; MFA 21-11-97; MetFoam DB
Alulight (0.751)
Alulight (0.646)
Alulight (0.32)
Alulight (0.55)
Alulight (0.5)
Fraunhofer (1.1)
Fraunhofer (0.8)
E
ρ
E 1/2
Cymat (0.155)
ρ
Duocel (0.162)
0.01
0.1 0.2 0.4
Density (Mg/m3 ρ
Hydro (0.143)
Hydro (0.196)
)
E 1/3
Alporas (0.21)
Hydro (0.18)
Hydro (0.15)
Alporas (0.245)
Cymat (0.355)
INCO (0.345)
Cymat (0.546)
INCO (0.285)
Hydro (0.406)
Duocel (0.198)
Duocel (0.19)
Duocel (R) (0.254)
Hydro (0.42)
Fraunhofer (0.7)
0.6 0.8 1
Figure 4.6 Young’s modulus plotted against density for currently available
metal foams. Output from CES3.1 with the MetFoam ’97 database
Stiffness and density
Figure 4.6 shows Young’s modulus, E, plotted against density for available
metal foams. For clarity, only some of the data have been identified. The
numbers in parentheses are the foam density in Mg/m 3 . The broken lines