期刊
ACTA MATERIALIA
卷 66, 期 -, 页码 326-339出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.11.020
关键词
Elastic constants; Mechanical properties; Porosity; X-ray tomography; Fibre networks
资金
- European Research Council [240446]
- Engineering and Physical Sciences Research Council [EP/C011112/1] Funding Source: researchfish
- European Research Council (ERC) [240446] Funding Source: European Research Council (ERC)
In the present paper, highly porous fibre networks made of 316L fibres, with different fibre volume fractions, are characterized in terms of network architecture, elastic constants and fracture energies. Elastic constants are measured using quasi-static mechanical and modal vibration testing, yielding local and globally averaged properties, respectively. Differences between quasi-static and dynamic elastic constants are attributed to through-thickness shear effects. Regardless of the method employed, networks show signs of material inhomogeneity at high fibre densities, in agreement with X-ray nanotomography results. Strong auxetic (or negative Poisson's ratio) behaviour is observed in the through-thickness direction, which is attributed to fibre kinking induced during processing. Measured fracture energies are compared with model predictions incorporating information about in-plane fibre orientation distribution, fibre volume fraction and single fibre work of fracture. Experimental values are broadly consistent with model predictions, based on the assumption that this energy is primarily associated with plastic deformation of individual fibres within a process zone of the same order as the inter-joint spacing. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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