PSI - Issue 24

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 24 (2019) 3–10

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers Finite element (FE) models were created to replicate the quasi - static punch test using the LS-DYNA solver and exploiting a material damage model that allows the reproduction of all the different types of failure occurring during the tests (fibre failure, matrix failure, delamination). The focus is placed on the capability of the model to mimic the experimental damage in order to have a reliable virtual tool able to provide, with high accuracy, the penetration mechanisms and the trend of the absorbed energy during the different phases of penetration. The comparison between experimental data and numerical results is discussed. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers Abstract The paper investigates the penetration mechanics f thick-section composites. For this purpose, a series of quasi-static p netration tests on Kevlar 29 (plane wave) / poxy panels with a ominal thick ess of 6.5 mm (14 layers) wer designed and conducted. The experiments were performed at different support spans using a blunt geometry for the punch. During the tests, the punch displacements and the applied force on the punch were measured. Finite element (FE) models were created t replicate the quasi - static punch test using the LS-DYNA solver a d exploiting a material damage model that allows the reproduction of all the different types of failure occurring during the tests (fibre failure, matrix failure, delamination). The focus is placed n the capability of the model to mimic the experimental damage i order to have a reliable virtual tool able to provide, with high accuracy, the penetratio mechanisms and the trend of the absorbed energy during the different phases of penetration. The comparison between experimental data and numerical results is discussed. © 2019 The Authors. Published by Elsevier B.V. This is an ope access article under t CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers AIAS 2019 International Conference on Stress Analysis Experimental testing and Numerical modelling of a Kevlar woven – epoxy matrix composite subjected to a punch test Franco Concli a , Alvaro Gonzalez-Jimenez b *, Andrea Manes b , Marco Giglio b a Free University of Bolzano/Bozen, piazza Università 1, Bolzano 39100, Italy b Politecnico di Milano, Dipartimento di Meccanica, via La Masa 1, Milano 20155, Italy Abstract The paper investigates the penetration mechanics of thick-section composites. For this purpose, a series of quasi-static penetration tests on Kevlar 29 (plane wave) /epoxy panels with a nominal thickness of 6.5 mm (14 layers) were designed and conducted. The experiments were performed at different support spans using a blunt geometry for the punch. During the tests, the punch displacements and the applied force on the punch were measured. AIAS 2019 International Conference on Stress Analysis Experimental testing and Numerical modelling of a Kevlar woven – epoxy matrix composite subjected to a punch test Franco Concli a , Alvaro Gonzalez-Jimenez b *, Andrea Manes b , Marco Giglio b a Free University of Bolzano/Bozen, piazz Università 1, Bolzano 39100, Italy b Politecnico di Milano, Dipartimento di Meccanica, via La Masa 1, Milano 20155, Italy

Keywords: low velocity; CFRP; numerical; LS-DYNA Keywords: low velocity; CFRP; numerical; LS-DYNA

* Corresponding author. Tel.: +39 02.2399.8668; fax: +39-02 2399 8263. E-mail address: alvaro.gonzalez@polimi.it * Corresponding uthor. Te .: +39 02.2399.8668; fax: +39-02 2399 8263. E-mail address: alvaro.gonzalez@polimi.it

1. Introduction Whether in the military or in the civil field, composites materials are widely used thanks to both their low density in comparison with traditional materials and their relatively good damage tolerance. Particularly, in the case 1. Introduction Whether in the milit ry or in the civil fiel , composites materials are widely used th nks to both their low density in comparison with traditional materials and their relatively good damage tolerance. Particularly, in the case

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the AIAS2019 organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers 10.1016/j.prostr.2020.02.001