PSI - Issue 83

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 83 (2026) 105–114

© 2026 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 ESIAM26 organizers Keywords: Stepwise functionally graded beam; delamination; moving component; non-linear viscoelastic behavior Abstract The present paper deals with a theoretical study of delamination in moving stepwise functionally graded beams. In particular, a beam structural component performing translational motion is considered. The movement is according to a given law. The acceleration and inertia loads on the beam are determined. The beam studied here is stepwise functionally graded, i.e. the beam has a discontinuous structure of distinct layers with sharp changes in properties. This beam is treated as a multilayered structure. One of the weaknesses of such beams is the risk of delamination fracture. Therefore, our attention is focused on delamination. The beam is assumed to be partially delaminated. Furthermore, the beam has non-linear viscoelastic behavior under the inertia load. A viscoelastic model with one dashpot and two springs (one of the springs has non-linear behavior) is applied for treating the beam. The integral J is used for studding delamination. The strain energy release rate (SERR) is derived for control of the J integral solution. A detailed analysis of the effects of the parameters of the moving beam component on the delamination is performed. The fourth European Conference on the Structural Integrity of Additively Manufactured Materials (ESIAM26) Delamination in moving stepwise functionally graded viscoelastic beams Victor Rizov* Department of Technical Mechanics, University of Architecture, Civil Engineering and Geodesy, 1 Chr. Smirnensky blvd., 1046 – Sofia, Bulgaria

1. Introduction Additive manufacturing offers broad opportunities in the production of functionally graded components of

* Corresponding author. Tel.: + (359-2) 963 52 45/664; fax: +(359-2) 865 68 63. E-mail address: v_rizov_fhe@uacg.bg

2452-3216 © 2026 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 ESIAM26 organizers 10.1016/j.prostr.2026.07.013