Experimental characterisation and modelling of mechanical behaviour of microcapsules

authors	Aniskevich, A; Kulakov, V; Bulderberga, O; Knotek, P; Tedim, J; Maia, F; Leisis, V; Zeleniakiene, D
nationality	International
journal	JOURNAL OF MATERIALS SCIENCE
keywords	DAMAGE; COMPOSITE; MICROCRACKS; STRENGTH
abstract	Results of experimental characterisation and modelling of mechanical behaviour of microcapsules for self-sensing polymer composites are presented. Melamine-formaldehyde microcapsules were selected for this purpose. The average diameter, size distribution, and shell thickness of microcapsules were evaluated from scanning electron microscopy images. Compressive properties of the shell material were evaluated in several ways. AFM measurements allowed estimating stiffness and strength of a single microcapsule. In parallel, modelling of the mechanical behaviour of a single microcapsule was performed. Buckling of a thin-walled spherical shell under external pressure was considered and closed-form solution in a linear statement was obtained. The results of analytical calculations were compared with FEM modelling. Two demonstrator thin-shells with the radius of centimetre scale, hollow and filled with water, were tested in compression between two rigid plates. The results of their numerical analysis obtained by FEM models developed are in good agreement with experimental results.
publisher	SPRINGER
issn	0022-2461
isbn	1573-4803
year published	2020
volume	55
issue	27
beginning page	13457
ending page	13471
digital object identifier (doi)	10.1007/s10853-020-04925-8
web of science category	Materials Science, Multidisciplinary
subject category	Materials Science
unique article identifier	WOS:000541330200002