TY - JOUR
T1 - Mechanical characterization of aerogel materials with digital image correlation
AU - Haj-Ali, Rami
AU - Eliasi, Rami
AU - Fourman, Victor
AU - Tzur, Chen
AU - Bar, Galit
AU - Grossman, Eitan
AU - Verker, Ronen
AU - Gvishi, Raz
AU - Gouzman, Irina
AU - Eliaz, Noam
N1 - Publisher Copyright:
© 2015 Elsevier Inc. All rights reserved.
PY - 2016/5/15
Y1 - 2016/5/15
N2 - Silica aerogels are ultralow density materials with nano-sized skeleton network of pores. Their high brittle nature presents a major challenge for mechanical testing and a need exists for novel testing methods. Two new mechanical setups and testing techniques are proposed for measuring the aerogel elastic mechanical properties. Both techniques employ full-field Digital Image Correlation (DIC) for surface deformation measurements. The first setup uses disk compression experiment, known as diametral compression test (Brazilian disk). However, the elastic properties of the material cannot be obtained directly. Instead, an inverse mechanics computational scheme, using both a finite element (FE) model and analytical solution, is proposed. The second direct testing setup is uniaxial compression of rectangular-shaped blocks. The Young's modulus and Poisson's ratio are extracted directly from the experimental stress-strain curves. Our results of tested samples show the relation between the density and the Young's modulus to coincide with previously published trends. The direct and iterative inverse-mechanics solution methods agree well with each other. The Poisson's ratio is found to be independent of the material apparent density. Comparisons between the two methods and recommendations for expanding the disk testing approach to fracture toughness are discussed.
AB - Silica aerogels are ultralow density materials with nano-sized skeleton network of pores. Their high brittle nature presents a major challenge for mechanical testing and a need exists for novel testing methods. Two new mechanical setups and testing techniques are proposed for measuring the aerogel elastic mechanical properties. Both techniques employ full-field Digital Image Correlation (DIC) for surface deformation measurements. The first setup uses disk compression experiment, known as diametral compression test (Brazilian disk). However, the elastic properties of the material cannot be obtained directly. Instead, an inverse mechanics computational scheme, using both a finite element (FE) model and analytical solution, is proposed. The second direct testing setup is uniaxial compression of rectangular-shaped blocks. The Young's modulus and Poisson's ratio are extracted directly from the experimental stress-strain curves. Our results of tested samples show the relation between the density and the Young's modulus to coincide with previously published trends. The direct and iterative inverse-mechanics solution methods agree well with each other. The Poisson's ratio is found to be independent of the material apparent density. Comparisons between the two methods and recommendations for expanding the disk testing approach to fracture toughness are discussed.
KW - Digital image correlation
KW - Disk compression
KW - Inverse mechanics
KW - Mechanical properties
KW - Silica aerogels
UR - http://www.scopus.com/inward/record.url?scp=84953775870&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2015.12.035
DO - 10.1016/j.micromeso.2015.12.035
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AN - SCOPUS:84953775870
SN - 1387-1811
VL - 226
SP - 44
EP - 52
JO - Zeolites
JF - Zeolites
ER -