PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 17 (2019) 51–57

ICSI 2019 The 3rd International Conference on Structural Integrity Incremental finite element delamination model for fibre pull-out ICSI 2019 The 3rd International Conference on Structural Integrity Incremental finite element delamination model for fibre pull-out

tests of elastomer-matrix composites Siegfried Frankl*, Martin Pletz, Clara Schuecker Department of Polymer Engineering and Science, Otto Gloeckel-Str. 2, 8700 Leoben, Austria tests of elastomer-matrix composites Siegfried Frankl*, Martin Pletz, Clara Schuecker Department of Polymer Engineering and Science, Otto Gloeckel-Str. 2, 8700 Leoben, Austria

Abstract A finite element model is introduced to predict the delamination behaviour of a fibre pull-out test of an elastomer matrix composite in an incremental approach. A displacement load is monotonically increased and stable crack growth is predicted. The finite element model uses energy differences of models with two different crack lengths to compute the energy release rate of the delamination crack. Parametric studies have been performed to determine the necessary element size and crack size increments, and investigate the effect of friction. Abstract A finite element model is introduced to predict the delamination behaviour of a fibre pull-out t st of an elastomer matrix composite in an incremental approach. A displacement load is notonically increased and stable crack growth is predicted. The finite element model uses energy differences of models with two differ nt crack lengths to compute the en rgy r lease rate of the dela i ation crack. Parametric studies have been performed to determine the necessary element size and crack size increments, and investigate the effect of friction.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: delaminations; fracture mechanics; elastomers; pull-out test; finite element method Keywords: delaminations; fracture mechanics; elastomers; pull-out test; finite element method

1. Introduction 1. Introduction

Fibre-reinforced rubber materials are used in various applications such as soft robotics, tires, conveyor belts and hydraulic hoses. While the fibres provide high strength and stiffness in fibre directions, the rubber can allow for high flexibility in other directions. Compared to classical carbon-fibre reinforced polymer laminates, the stiffness difference between fibre and matrix is considerably higher for rubber-based composites. This puts high demands on the fibre-matrix interface, as described for conveyor belts by Fedorko et al. (2014) and for hydraulic hoses by Fedorko et al. (2015). Fibre-reinforced rubber materials are used in various applications such as soft robotics, tires, conveyor belts and hydraulic hoses. While the fibres provide high strength and stiffness in fibre directions, the rubber can allow for high flexibility in other directions. Compared to classical carbon-fibre reinforced polymer laminates, the stiffness difference between fibre and matrix is considerably higher for rubber-based composites. This puts high demands on the fibre-matrix interface, as described for conveyor belts by Fedorko et al. (2014) and for hydraulic hoses by Fedorko et al. (2015).

* Corresponding author. Tel.: +43-3842-402-2505. E-mail address: siegfried.frankl@unileoben.ac.at * Correspon ing author. Tel.: +43-3842-402-2505. E-mail address: siegfried.frankl@unileoben.ac.at

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.008