Response and Crushing of Cellular Solids Under Uniaxial and Multiaxial Loadings
Abstract
The compressive response of many cellular materials is characterized by a sharp initial rise to a load maximum followed by an extended load plateau which terminates by a second sharp rise in load. This behavior was illustrated using aluminum and polymeric honeycombs under in-plane loads. It was shown that these characteristics are associated with inelastic buckling and a localization process in which only a narrow zone of cells experiences collapse at any given time. The collapse spreads in a steady-state fashion until all the material is affected. Models of several levels were developed and used to establish the mechanical properties of interest including the elastic modulus, the "yield" stress and the energy absorption capacity under both uniaxial and multiaxial loading conditions. The project continued with a similar investigation of open cell aluminum and polymeric foams. The mechanical response of such foams has the same general characteristics as those seen in honeycombs. The modeling of this behavior again requires proper representation of the cellular microstructure and appropriate modeling of the base material. The work on foams continues beyond d the termination of this project.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 21, 2004
- Accession Number
- ADA423997
Entities
People
- S. Kyriakides
Organizations
- University of Texas at Austin