Thesis (Ph. D.)--Lehigh University, 2005. / Includes vita. Includes bibliographical references.

Metallic foams have become widely available and have unique properties that make them attractive for use in a variety of engineering applications. Due to their complex structure, the behavior of foams under complex loading conditions is a subject of continued research. Digital volume correlation is a technique wherein full-field strains in three dimensions can be measured from high resolution x-ray CT image data. This technique was employed to measured strains in two commercially available aluminum foams, one each of open and closed-cell morphology, under two complex loading scenarios: rigid spherical indention, and uniaxial compression of a sample with a central hole. In addition to comparing the behavior of the two foams, results are also compared to strain fields analytically predicted by a third-party constitutive model implemented in finite element analysis. Under indention loading, the two examined foams showed a distinct difference in deformation and strain field, however the foams behaved similarly under uniaxial compression of rectangular samples with central holes. The constitutive model was found to be unsuitable for modeling the experimentally measured foams. / Graduation date: 2004

No description available.

Thesis (M.S.)--California Polytechnic State University, 2009. / Title from PDF title page; viewed on June 5, 2009. "May 2009." "In partial fulfillment of the requirements for the degree of Master of Science in Aerospace Engineering." "Presented to the Aerospace Engineering Department, California Polytechnic State University, San Luis Obispo." Major professor: Jin Tso, Ph.D. Includes bibliographical references (p. 124-125). Also available on microfiche.

Thesis (Master)--İzmir Institute of Technology, İzmir, 2005 / Keywords: Foam metal, mechanical properties. Includes bibliographical references (leaves. 48).

Thesis (Ph.D.) -- Australian National University, 2008. / CD Rom contains Appendix - movie files in .mpg format produced using the Aramis optical strain measurement system during this project.

Metal foams are lightweight structures and have large use in many components acting as impact energy absorbers. They have exceptional mechanical, thermal and acoustic properties. The design or selection of foam for packaging is done on the basis of impact loads to be sustained or energy to be absorbed. For transportation of nuclear material, metal foams can be used as a packaging material. It may be noted that apart from other qualification requirements, a package containing nuclear material, has to be certified for drop test. Foam can serve the purpose by providing proper cushioning. Metal foams are still under development and need to be accurately characterized in terms of their mechanical properties as well as cell morphology. The aim of this work is to develop, characterize and model foam using experiments and analysis. Aluminum foam has been developed by powder metallurgy technique and the effect of addition of varying amounts of Mg and Alumina on the strength and energy absorption has been studied. Foams of varying densities have also been developed. The reason for going for higher density is to obtain higher plateau stress. If a package is designed with lower density foam, it may become very bulky and even impractical. The characterization part of the work includes study of porosity distribution, cell wall structure, microscopy, SEM images, etc. Mechanical testing (uniaxial compression) was performed on foam samples to get load deflection curve of foams. Area under a given curve i.e. energy absorbed per unit volume has been compared for various compositions and densities. The analysis part of the work presents effect of specimen size on bulk properties of foam. 2D honeycomb and 3D cases have been discussed. To model the porosities, spherical cavities have been assumed. Uniaxial compression cases with different combinations of porosities have been analyzed. The properties like Young’s modulus, plateau stress, Poisson’s ratio, tangent modulus, etc. have been evaluated. The effect of variation in yield strength and tangent modulus of base material on foam has been studied. It appears that if the model is based on uniform porosity distribution, it may lead to lower bound values of physical properties and give conservative result. Although some of these trends have been observed in published literature, the current numerical study has generated additional information and insight.

No description available.

Thesis (Ph.D.)--Auburn University, 2005. / Abstract. Vita. Includes bibliographic references (ℓ. 134-138)

Thesis (Master)--İzmir Institute of Technology, İzmir, 2005. / Keywords:crushing, aluminum foam, foam filling, energy absorber, composite tubes. Includes bibliographical references (leaves. 93-96).