TY  - JOUR
A1  - Giannakopoulos, Antonios E.
A1  - Zisis, Athanasios
A1  - Zervaki, Anna D.
A1  - Dimopoulos, Christos D.
A1  - Platypodis, Efstathios
A1  - Eberwein, Robert
T1  - Effective elastic moduli and failure mechanisms of a random assembly of thin walled glass microbubbles
JF  - International Journal of Solids and Structures
N2  - In this work a methodology is presented to estimate the elastic properties and failure mechanisms of an assembly of random, brittle microbubbles. The approach is based on the mechanics of frictionless micro-contact between hollow spherical shells by employing relations from classical shell theory and verified by two dimensional axisymmetric Finite Elements. The estimated values are in agreement with available experimental values. Moreover, a granular type analytical homogenization model provides an isotropic elastic constitutive law to be used for the macroscopic deformation of an assembly of glass micro-bubbles when it is compressed by external loads. In addition, approximate estimates are also proposed for two important micro-failure mechanisms of such assemblies that relate either to the splitting or to the buckling of a brittle spherical shell, prior its complete crushing. The results are novel and are expected to enhance the application of glass microbubbles directly in acute thermal insulation problems such as liquid hydrogen storage.
KW  - LH2
KW  - Cryogenic Vessels
KW  - Insulation
PY  - 2025
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-634354
DO  - https://doi.org/10.1016/j.ijsolstr.2025.113528
SN  - 0020-7683
VL  - 320
SP  - 1
EP  - 11
PB  - Elsevier BV
CY  - Amsterdam
AN  - OPUS4-63435
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -