PSI - Issue 14

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 14 (2019) 891–899

2nd International Conference on Structural Integrity and Exhibition 2018 Fracture Toughness and Strength of the Interface of an Intrinsic Hybrid Laminate Robert Brandt a *, Arne Busch a a University of Siegen, Am Eichenhang 50, 57076 Siegen, Germany 2nd International Conference on Structural Integrity and Exhibition 2018 Fracture Toughness and Strength of the Interface of an Intrinsic Hybrid Laminate Robert Brandt a *, Arne Busch a a University of Siegen, Am Eichenhang 50, 57076 Siegen, Germany Unidirectional glass fiber reinforced plastic (U-GFRP) represents itself as an excellent lightweight structural material due to its high tensile strength and its low density . A major drawback, however, is the relative weakness of the matrix under more complex, multi-axial loading conditions. Therefore, a local hybridization of U-GFRP seems to be an adequate measure to enhance the robustness of the material. First, the material testing program sets the focus on the investigation of the strength of the interface between U-GFRP and the additional constituent steel. Hence, the energy release rate , the static shear strength as well as the cyclic shear strength of the considered interface have been determined at room temperature RT and at an elevated temperature of Additionally, aged specimens have been statically tested as well. The results show up that primers, such as silane, are leading to a good adhesion between the constituents. Furthermore, a fiber bridging effect is apparent which leads to an increase of the energy release rate with the growth of the length of the crack. A power law is well suited to describe this strengthening and its exponent serves as a further measure to describe the strength of the interface. Generally, ageing of the material and straining at an elevated temperature harm the performance of the intrinsic hybrid material. © 2018 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/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Unidirect onal glass fiber reinforced plast c (U-GFRP) represents itself as an excellent l ght ight tructural aterial ue to its high t nsile strength and its low de sity . A major drawback, however, is the relativ weakness of the matrix under more complex, multi-axial loading conditions. Therefore, a local hybridization of U-GFRP seems to be an adequate measure to e hance th robustness of the materi l. First, the ma erial testing program s ts the focus on the investigation of the strength of the interf ce between U-GFRP and the additi nal constituent steel. Hence, the en rgy r lease rate , the static shear strength s w ll as th cyclic shear strength of the considered interface hav been determin t room temperat re RT and at an elevated temperature of Additionally, aged sp cim s have been statically tested as well. The results show u tha primers, such as s lan , are leading to a good adhesion between the consti u nts. Furthermore, fiber bridging effect is apparent whi h l ads to an incr ase of the en rgy release rate with the growth of the length of the c ack. A pow r law is well suited to describe this strengthening and its exponent serves as a further measure to describe the st ength of the in f ce. Generally, ageing of the material and straining at an elevated temperature harm the performance of the intrinsic hybrid material. © 2018 The Authors. Published by Elsevier B.V. This is an open access article und r the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2019 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/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Abstract Abstract

Keywords: Hybrid Laminates; Double-Cantilever-Beam; Shear Strength, Interface, Joining Keywords: Hybrid Laminates; Double-Cantilever-Beam; Shear Strength, Interface, Joining

* Corresponding author. Tel.: +49 271 740 4397 E-mail address: Robert.brandt@uni-siegen.de * Correspon ing author. Tel.: +49 271 740 4397 E-mail address: Robert.brandt@uni-siegen.de

2452-3216 © 2018 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/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

2452-3216  2019 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/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.07.068