PSI - Issue 54

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 54 (2024) 475–481

© 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 responsibility of the scientific committee of the ICSI 2023 organizers Abstract One of the important tenors for gaining efficiency in the present-day engineering is to intensify the use of advanced high performance structural materials. Typical examples for such highly efficient materials are multilayered inhomogeneous systems. Components of load-carrying engineering structures made of multilayered inhomogeneous materials, however, tend to develop delamination during use. Therefore, their safe operation and lifetime are severely limited by delamination fracture. Besides, it is of frequent occurrence engineering structures to be under mobile external loading. This theoretical paper describes a delamination analysis of a multilayered inhomogeneous load-carrying beam structure under an external force that movies at a constant velocity along the upper surface of the structure. When determining the strain energy release rate, the beam is treated by using a non-linear viscoelastic model under time-dependent stress. Since the layers are inhomogeneous, the model parameters are smooth functions of the beam longitudinal coordinate. The J -integral method is used to examine the strain energy release rate solution. The ascendency of the mobile loading parameters over the strain energy release rate is inquired into. The modus presented in this paper allowed us to examine the dependence of delamination on the continuous variation of the parameters of the model along the length of the layers. © 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 responsibility of the scientific committee of the ICSI 2023 organizers Keywords: Moving loading; Delamination; Multilayered beam; Viscoelastic structure; Inhomogeneous material International Conference on Structural Integrity 2023 (ICSI 2023) Delamination of multilayered viscoelastic inhomogeneous beams under moving loading Victor Rizov* Department of Technical Mechanics, University of Architecture, Civil Engineering and Geodesy, 1 Chr. Smirnensky blvd., 1046 – Sofia, Bulgaria

1. Introduction Many engineering structures and facilities are made from multilayered materials. As known, these materials

* Corresponding author. Tel.: + (359-2) 963 52 45 / 664; fax: + (359-2) 86 56 863 E-mail address: v_rizov_fhe@uacg.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 responsibility of the scientific committee of the ICSI 2023 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 responsibility of the scientific committee of the ICSI 2023 organizers 10.1016/j.prostr.2024.01.109