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Notches in fibrous materials: micro-mechanisms of deformation and damage

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conference contribution
posted on 01.12.2017, 11:14 by Emrah Sozumert, Farukh Farukh, Baris Sabuncuoglu, Emrah DemirciEmrah Demirci, Memis Acar, Behnam Pourdeyhimi, Vadim SilberschmidtVadim Silberschmidt
Fibrous networks are ubiquitous structures for many natural materials, such as bones and bacterial cellulose, and artificial ones (e.g. polymer-based nonwovens). Mechanical behaviour of these networks are of interest to researchers since it deviates significantly from that of traditional materials treated usually within the framework of continuum mechanics. The main reason for this difference is a discontinuous character of networks with randomly distributed fibres (that can be also curved) resulting in complex scenarios of fibre-to-fibre interactions in the process of their deformation. This also affects a character of load transfer, characterised by spatial non-uniformity and localisation. A discontinuous nature of fibrous networks results in their non-trivial failure character and, more specifically, evolution of failure caused by notches. In order to investigate these mechanisms, various notches are introduced both into real-life specimens used in experimentation and discontinuous finite-element (FE) models specially developed (Farukh et al., 2014a; Hou et al., 2009, 2011a; Sabuncuoglu et al, 2013) to mimic the microstructure of fibrous networks. The specimens were tested under tensile loading in one of the principal directions, with FE-based simulations emulating this regime. The effect of notch shape on damage mechanisms, effective material toughness and damage patterns was investigated using the obtained experimental and numerical methods. The developed discontinuous model with direct introduction of microstructural features of fibrous networks allowed assessment of strain distribution over selected paths in them in order to obtain strain profiles in the vicinity of notch tips. Additionally, evolution of damage calculated in advanced numerical simulations demonstrated a good agreement with images from experiments.

Funding

Nonwoven Institute at North Carolina State University, Raleigh, USA, and the EU Framework Programme for Research and Innovation: Horizon 2020 (MSCA RISE-2014 grant No 644175 MATRIXASSAY).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM) Procedia Structural Integrity

Volume

6

Pages

168 - 173 (6)

Citation

SOZUMERT, E. ... et al, 2017. Notches in fibrous materials: micro-mechanisms of deformation and damage. Procedia Structural Integrity, 6, pp. 168-173.

Publisher

Elsevier © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This paper was published in the journal Procedia Structural Integrity and is also available at https://doi.org/10.1016/j.prostr.2017.11.026. This paper was presented at the XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures. Fundamentals of Static and Dynamic Fracture", MCM 2017, St. Petersburg, Russia, 25th-27th September 2017.

ISSN

2452-3216

Language

en

Location

St. Petersburg, Russia