Carbon foam characterization: sandwich flexure, tensile and shear response

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Title: Carbon foam characterization: sandwich flexure, tensile and shear response
Author: Sarzynski, Melanie Diane
Abstract: The focus of this research is characterizing a new material system composed of carbon and graphite foams , which has potential in a wide variety of applications encompassing aerospace , military , offshore , power production and other commercial industries . The benefits of this new material include low cost , light weight , fire -resistance , good energy absorption , and thermal insulation or conduction as desired . The objective of this research is to explore the bulk material properties and failure modes of the carbon foam through experimental and computational analysis in order to provide a better understanding and assessment of the material for successful design in future applications . Experiments are conducted according to ASTM standards to determine the mechanical properties and failure modes of the carbon foam . Sandwich beams composed of open cell carbon foam cores and carbon -epoxy laminate face sheets are tested in the flexure condition using a four point setup . The primary failure mode is shear cracks developing in the carbon foam core at a critical axial strain value of 2 ,262 ? ? . In addition to flexure , the carbon foam is loaded under tensile and shear loads to determine the respective material moduli . Computational analysis is undertaken to further investigate the carbon foam's failure modes and material characteristics in the sandwich beam configuration . Initial estimates are found using classical laminated plate theory and a linear finite element model . Poor results were obtained due to violation of assumptions used in both cases . Thus , an additional computational analysis incorporating three dimensional strain -displacement relationships into the finite element analysis is used . Also , a failure behavior pattern for the carbon foam core is included to simulate the unique failure progression of the carbon foam on a microstructure level . Results indicate that displacements , strains and stresses from the flexure experiments are closely predicted by this two parameter progressive damage model . The final computational model consisted of a bond line (interface ) study to determine the source of the damage initiation , and it is concluded that damage initiates in the carbon foam , not at the bond line .
URI: http : / /hdl .handle .net /1969 .1 /55
Date: 2004-09-30

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Carbon foam characterization: sandwich flexure, tensile and shear response. Available electronically from http : / /hdl .handle .net /1969 .1 /55 .

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