Metal Foams: A Design Guide

In this chapter we summarize reliable methods for characterizing metallic foams in uniaxial compression, uniaxial tension, shear and multiaxial stress states, under conditions of creep and fatigue, and during indentation

MF Ashby

2002

Scholarcy highlights

  • Metal foams are a new, as yet imperfectly characterized, class of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties
  • A material is selected for a given component because its property profile matches that demanded by the application
  • A property profile is a statement of the characteristics required of a material if it is to perform well in a given application
  • It identifies simple property limits which are dictated by constraints imposed by the design: requirements for electrical insulation or conduction impose limits on resistivity; requirements of operating temperature or environment impose limits on allowable service temperature or on corrosion and oxidation resistance
  • Assembling these, we find the foam which will just protect the packaged object from a deceleration aŁ is that with a plateau stress
  • Greasing the faces of the specimen in contact with the loading platens reduces frictional effects and can give an apparent compressive strength that is up to 25% higher than that of a dry specimen
  • Examples of the use of metfoams for thermal management can be found in the case studies of Sections 16.4, 16.5, 16.6 and 16.8
  • The equation is evaluated in Table 16.3 for two extreme values of1 for a set of materials including cast irons, steels, aluminum alloys, titanium, beryllium and three metal foams

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