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Deformacao e absorcao de energia em materiais celulares

By Maria de Fatima Reis Vaz

Abstract

Cellular materials have unique properties which makes them widely used. However only recently have been developed studies concerning cellular materials. These works relate the mechanical behavior with structure. The high energy absorption capacity of cellular solids makes attractive to applications such as packaging. Energy absorption is related to the deformation of cellular solids. The deformation of cellular materials under compression is not uniform, i.e., localization occurs. Many subjects concerning deformation and energy absorption are not well understood. The aim of this thesis is to clarify some aspects related to phenomena and modelling of deformation. Deformation under compression and indentation are studied and simulated. The first part of this thesis (chapter 1) is an introduction to cellular materials concerning deformation and energy absorption. The chapter 2 is devoted to indentation of cellular materials. The experimental work is described. The effects of the radius and geometry of the indenture and rate effects were studied. The mechanisms of indentation are discussed. In chapter 3 an analysis of the behavior under compression was carried out. The experimental work clarifies some aspects concerning localization of deformation. In chapter 4 a model is proposed to simulate compression of cellular solids under constant rate. Model includes localization effects. The way variables such as imposed velocity, dissipative conditions and the characteristics of the model affect the result is studiedAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Topics: 11F - Metallurgy, metallography, 12C - Applied mathematics, CELLULAR MATERIALS, ENERGY ABSORPTION, INDENTATION, COMPRESSION UNDER QUASI STATIC CONDITIONS, MODELLING, LOCALIZATION OF DEFORMATION
Year: 1994
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Provided by: OpenGrey Repository
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