PSI - Issue 33

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

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

Procedia Structural Integrity 33 (2021) 126–137

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract For an efficient use of adhesive joints, reliable prediction techniques should be made available to the designer. Simulation is usually accomplished by the Finite Element Method (FEM). However, in adhesive joints, the adhesive thickness is much smaller than that of the adherends, thus requiring a refined mesh to produce good results. Linked to this, the adhesive has to withstand high strains, causing mesh distortion and making difficult to attain solution. In these cases, meshless methods can be a good alternative, although these are not sufficiently validated yet. This work aims to implement the von Mises (vM) and Exponent Drucker-Prager (EDP) criteria into a user-built meshless method software based on the Radial Point Interpolation Method (RPIM), for the strength prediction of adhesively-bonded single-lap joints (SLJ). Validation with experiments is undertaken for a medium-ductile adhesive (Araldite ® 2015) with varying overlap lengths ( L O ). Stress and strain distributions were plotted in the adhesive layer, and the failure load ( P m ) was assessed by continuum mechanics failure criteria. The meshless method showed to be promising in predicting the behavior of bonded joints, although limitations were found by using continuum mechanics criteria. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Meshless methods; Plasticity; Adhesive joints; Structural adhesive; Numerical methods. 1. Introduction Due to their characteristics, adhesive joints have shown significant growth in the industry. The possibility of joining different types of materials, low weight, high strength, rapid production, and more uniform stress IGF26 - 26th International Conference on Fracture and Structural Integrity Meshless approach to material plasticity in adhesive joints R.F.P. Resende a , B.F.P. Resende a , I.J. Sánchez-Arce b , D.C. Gonçalves b , L.D.C. Ramalho b , R.D.S.G. Campilho a,b *, J. Belinha a a Instituto Superior de Engenharia do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal b INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal Abstract For an efficient use of adhesive joints, reliable prediction techniques should be made available to the designer. Simulation is usually accomplish d by t Finite Element M thod (FEM). Howev r, in adhesive joints, the dhesive thickness is much smaller than that of the adherends, thus r quiring a refined mesh to pr duc good results. L ked to this, th adhesive has to withstand high strains, causing mesh disto tion a d mak g difficult to attain s lution. In these cases, meshl ss m thods can be a goo alternative, although th e are no sufficiently vali ated ye . This work a ms to impl ment the von Mises (vM) d Exponent Drucker-Prager (EDP) crite ia in o a us r-built meshless met od s ftware based on the Radial Point Interpol tion Method (RPIM), for the strength pr d ction of adh sively-bonded ingl -lap join s (SLJ). Validation with experiments is undertaken for a medium-duc il adhesive (Araldite ® 2015) with varying over ap lengths ( L O ). Stress and stra n distributio s were plotted in the adhesive layer, an the failu e load ( P m ) was assessed by continuum mechanics failure crite ia. The meshle s method showed to be promising in predicting th behavior of bonded joints, although limitations were found by using continuum ec anics crit ria. © 2021 The Authors. Publis d by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statem nt: Peer-revi w under responsibility of th scientifi committee of the IGF ExCo K ywords: Meshless methods; Plasticity; Adhesive joi ts; Structural adhesive; Numerical meth ds. 1. Introduction Due to their characteristics, adhesive joints have shown significant growth in the industry. The possibility of joining different types of material , low weight, high strength, rapid production, and more uniform stress IGF26 - 26th International Conference on Fracture and Structural Integrity Meshless approach to material plasticity in adhesive joints R.F.P. Resende a , B.F.P. Resende a , I.J. Sánchez-Arce b , D.C. Gonçalves b , L.D.C. Ramalho b , R.D.S.G. Campilho a,b *, J. Belinha a a Instituto Superior de Engenharia do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal b INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal

* Corresponding author. Tel.: 351939526892; fax: +351228321159. E-mail address: raulcampilho@gmail.com * Corresponding author. Tel.: 351939526892; fax: +351228321159. E-mail address: raulcampilho@gmail.com

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-revi w under responsibility of the scientifi committee of the IGF ExCo

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.017