PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 43 (2023) 282–287

© 2023 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 the responsibility of MSMF10 organizers. © 20 23 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 the responsibility of MSMF10 organizers. and minimization of the strain e ergy. Second, the the retical criteri n for delamination in the i terface la er, based on the model ISS, is form lated and the obtaine non-linear equation in respect to debond length is solved numerically, for both solutions, at differ t values of echanical load and ge metry of the tructure layers. It was found that delamination doesn’t app r at fixed WS 2 length of 10 μm , if the loading is up to 5 GPa for Cas 1 and up to 1.175 GP f r Case 2, respectively. With increasing WS 2 length, the delamination occurs at increasingly higher values of the applied external load, for Case 2. For Cas 1 a delamination is not occurs. At fixed applied load, it was found for Case 2, that as the le gth of WS 2 inc eases, the debonding length increases, too. The obtained results could be used for fast prediction of delamination in similar nanostructured devices. © 20 23 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 the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture Theoretical study about influence of geometry and mechanical load on the delamination in tungsten disulfide/poly(methyl methacrylate) nanocomposite structure under axial load Elisaveta Kirilova a, *, Tatyana Petrova a , Natasha Vaklieva-Bancheva a , Rayka Vladova a , Tsviatko Rangelov b , Apostol Apostolov a a Institute of Chemical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl.103, Sofia 1113, Bulgaria b Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl.8, Sofia 1113, Bulgaria Abstract The influence of the geometry and the magnitude of axially applied mechanical load on the delamination in three-layer tungsten disulphide (WS 2 )/SU-8/poly(methyl methacrylate) (PMMA) nanocomposite, is investigated theoretically. First, for considered nanostructures with thinner and thicker PMMA layer two different analytical solutions (Case 1 and Case 2) for the interface shear stress (ISS) in the middle layer of the structure are obtained, based on the application of two-dimensional stress-function method and minimization of the strain energy. Second, the theoretical criterion for delamination in the interface layer, based on the model ISS, is formulated and the obtained non-linear equation in respect to debond length is solved numerically, for both solutions, at different values of mechanical load and geometry of the structure layers. It was found that delamination doesn’t appear at fixed WS 2 length of 10 μm , if the loading is up to 5 GPa for Case 1 and up to 1.175 GPa for Case 2, respectively. With increasing WS 2 length, the delamination occurs at increasingly higher values of the applied external load, for Case 2. For Case 1 a delamination is not occurs. At fixed applied load, it was found for Case 2, that as the length of WS 2 increases, the debonding length increases, too. The obtained results could be used for fast prediction of delamination in similar nanostructured devices. 10th International Conference on Materials Structure and Micromechanics of Fracture Theoretical study about influence of geometry and mechanical load on the delamination in tungsten disulfide/poly(methyl methacrylate) nanocomposite structure under axial load Elisaveta Kirilova a, *, Tatyana Petrova a , Natasha Vaklieva-Bancheva a , Rayka Vladova a , Tsviatko Rangelov b , Apostol Apostolov a a Insti ute of C ical Engineering, Bulgarian Academy of Scien es, Acad. G. Bonchev Str., Bl.103, Sofia 11 3, Bulgaria b Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl.8, Sofia 1113, Bulgaria Abstract The influ nce of the geometry and the magnitud of axially applied echanical load on th delamination in three-layer tungst n disulphide (WS 2 )/SU-8/poly(met yl methacrylate) (PMMA) na ocomposite, is investig t d theoretically. First, for considered nano tructures with thinner and thicker PMMA layer two different analytic l soluti s (Case 1 and Case 2) for the i terface shear stress (ISS) in the middle l yer of the structure are obtained, based the application of two-dimension l stress-function method Keywords: interface shear stress; WS 2 /SU-8/PMMA nanocomposite; applied mechanical load; parametric analysis; interface delamination Keywords: interface shear stress; WS 2 /SU-8/PMMA nanocomposite; applied mechanical load; parametric analysis; interface delamination

* Corresponding author. Tel.: +359-878-89-65-85. E-mail address: e.kirilova@iche.bas.bg * Correspon ing author. Tel.: +359-878-89-65-85. E-mail address: e.kirilova@iche.bas.bg

2452-3216 © 2023 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 the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 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 the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.272