Experimental and Numerical Analysis of Aluminium Foams by Nanoindentation and Multi-scale Modeling

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00240651" target="_blank" >RIV/68407700:21110/16:00240651 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

čeština

Original language name

Experimentální a numerická analýza hliníkových pěn pomocí nanoindentace a víceúrovňového modelování

Original language description

This work aims to predict the macroscopic mechanical properties of highly porous material of aluminum foam using detailed knowledge of microstructure, micromechanical properties and a two-level numerical model. The first level deals with the analysis of complicated heterogeneous microstructure and micromechanical properties of a solid phase of two different commercially available foams based on aluminum (Alporas and Aluhab). These materials are characterized by a closed pore system with very thin pore walls and large air pores. Due to the small dimensions of the cell walls and their specific heterogeneous microstructure, which is a result of the manufacturing process, testing on macro-scale is not possible. Therefore the experimental method of nanoindentation was successfully used for characterization of the materials. The second level of the model describes the porous structure of the foam. Cell walls are considered as homogeneous at this level with effective properties from the analysis of measured data on the first level. The work compares the results of several nanoindentation approaches for the assessment of hardness and elastic parameters using both the quasi-static indentation and the dynamic modulus mapping method. The results of quasi-static indentation were performed for two different indenter geometries (Berkovich and spherical tips). The material phase properties were analyzed with grid indentation method based on statistical evaluation of a large number of indentations (statistical deconvolution technique) as well as with isolated indentations by spherical indenter that revealed overall properties of the foam cell wall. Special attention was paid to the volume affected by the indenter and other key parameters influencing reliable evaluation of nanoindentation measurements. The effective elastic properties of the cell wall of both materials were obtained using analytical homogenization schemes (e.g. Mori-Tanaka). A very good agreement was found between t

Czech name

Experimentální a numerická analýza hliníkových pěn pomocí nanoindentace a víceúrovňového modelování

Czech description

This work aims to predict the macroscopic mechanical properties of highly porous material of aluminum foam using detailed knowledge of microstructure, micromechanical properties and a two-level numerical model. The first level deals with the analysis of complicated heterogeneous microstructure and micromechanical properties of a solid phase of two different commercially available foams based on aluminum (Alporas and Aluhab). These materials are characterized by a closed pore system with very thin pore walls and large air pores. Due to the small dimensions of the cell walls and their specific heterogeneous microstructure, which is a result of the manufacturing process, testing on macro-scale is not possible. Therefore the experimental method of nanoindentation was successfully used for characterization of the materials. The second level of the model describes the porous structure of the foam. Cell walls are considered as homogeneous at this level with effective properties from the analysis of measured data on the first level. The work compares the results of several nanoindentation approaches for the assessment of hardness and elastic parameters using both the quasi-static indentation and the dynamic modulus mapping method. The results of quasi-static indentation were performed for two different indenter geometries (Berkovich and spherical tips). The material phase properties were analyzed with grid indentation method based on statistical evaluation of a large number of indentations (statistical deconvolution technique) as well as with isolated indentations by spherical indenter that revealed overall properties of the foam cell wall. Special attention was paid to the volume affected by the indenter and other key parameters influencing reliable evaluation of nanoindentation measurements. The effective elastic properties of the cell wall of both materials were obtained using analytical homogenization schemes (e.g. Mori-Tanaka). A very good agreement was found between t

Type

B - Specialist book

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

ISBN

978-80-01-05903-6

Number of pages

103

Publisher name

CTU Publishing House

Place of publication

Praha

UT code for WoS book

—