PSI - Issue 23

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

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ScienceDirect

Procedia Structural Integrity 23 (2019) 293–298

© 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 scientific committee of the ICMSMF organizers © 201 9 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 scientific committee of the IC MSMF organizers. Plastic pip produc rs ar forc d by various i itiativ s to incr ase the content of recycled material in their pro ucts. The performance of the recycled m terial is worse than the perform nce of the virgin material. Tha is why plastic pipe made ntirely of r cycled material re now allowed fo non-pressur ap lications only. It would be heoretically possib e to use the recycl d mat rial in pressure applications a part of multilay r p pes. In this ontribution, lifetimes of both multilay r and single-layer pipes containing rec cled m terial ar est mated to see, if the pr ence o recy led material layer in the pipe wall r duces the life ime significantly. Several possible design are c sidered. Test da a from cra ked round bar (CRB) tests o the recycled m terial r use as an input for the lifetime estimation. The lifetime estimation is carried out using FEM modelling of different loading cases and integration of the power law that describes the crack growth rate. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Design of plastic pipes considering content of recycled material Jan Poduška a,b *, Pavol Dlhý b,c , Pavel Hutař b , Andreas Frank d , Jaroslav Kučera e , Jiří Sadílek e , Luboš Náhlík f a Institute of Solid Mechanics, Mechatronics and Biomechanics, FME BUT, Technická 2896/2, 61669 Brno, Czech Republic b Institute of Physics of Materials, AS CR, Žižkova 22, 61662 Brno, C zech Republic c CEITEC BUT, Purkyňova 123, 62100 Brno, Czech Republic d Polymer Competence Center Leoben, Roseggerstrasse 12, A-8700 Leoben, Austria e Polymer Institute Brno, Tkalcovská 36/2, 60200 Brno, Czech Republic f CEITEC IPM, Žižkova 22, 61662 Brno, Cze ch Republic 9th International Conference on Materials Structure and Micromechanics of Fracture Design of plastic pipes considering content of recycled material Jan Poduška a,b *, Pavol Dlhý b,c , Pavel Hutař b , Andreas Frank d , Jaroslav Kučera e , Jiří Sadílek e , Luboš Náhlík f a Institute of Solid Mechanics, Mec atronics and Biomechanics, FME BUT, Technická 2896/2, 61669 Brno, Czech Republic b Institute of Physics of Materials, AS CR, Žižkova 22, 61662 Brno, C ze h Republic c CEITEC BUT, Purkyňova 123, 62100 Brno, Czech Republic d Polymer Competence Center Leoben, Roseggerstrasse 12, A-8700 Leoben, Austria e Polymer Institute Brno, T alcovská 3 / , 60200 Brno, Czech Republic f CEITEC IPM, Žižkova 22, 61662 Brno, Cze ch Republic Abstract Abstract Plastic pipe producers are forced by various initiatives to increase the content of recycled material in their products. The performance of the recycled material is worse than the performance of the virgin material. That is why plastic pipes made entirely of recycled material are now allowed for non-pressure applications only. It would be theoretically possible to use the recycled material in pressure applications as a part of multilayer pipes. In this contribution, lifetimes of both multilayer and single-layer pipes containing recycled materials are estimated to see, if the presence of recycled material layer in the pipe wall reduces the lifetime significantly. Several possible designs are considered. Test data from cracked round bar (CRB) tests on the recycled material are used as an input for the lifetime estimation. The lifetime estimation is carried out using FEM modelling of different loading cases and integration of the power law that describes the crack growth rate.

Keywords: multilayer plastic pipe; slow crack growth; recycled plastic; crack growth simulation; lifetime calculation Keywords: multilayer plastic pipe; slow crack growth; recycled plastic; crack growth simulation; lifetime calculation

* Corresponding author. Tel.: +420 532 290 347 E-mail address: poduska@ipm.cz * Correspon ing author. Tel.: +420 532 290 347 E-mail address: poduska@ipm.cz

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 scientific committee of the IC MSMF 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://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF 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 scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.102