PSI - Issue 83

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ScienceDirect

Procedia Structural Integrity 83 (2026) 85–94

© 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: Moving functionally graded beam structure; longitudinal fracture; creep; SERR – time curve Abstract The purpose of this paper is to develop a theoretical analysis of longitudinal fracture in a moving functionally graded beam structure under conditions of creep. Analyzing fracture in moving functionally graded beams is important since functionally graded materials are frequently used for manufacturing components of various mechanisms and devices performing different kinds of motion. The beam considered here rotates around a vertical axis. The axis itself moves vertically. The beam hosts a longitudinal crack. The strain energy release rate (SERR) is derived with considering the non-linear creep in the beam under inertia loads. The parameters of creep equation used in the analysis change continuously along the thickness since the beam is functionally graded in the thickness direction. The SERR is verified by the method of J integral. A detailed evaluation of the effects of acceleration of the beam structure on the SERR is carried-out. The influence of various parameters on the SERR - time curve is studied. 1. Introduction Additive manufacturing technologies are emerging as a powerful tool for dramatically accelerating progress in many industries (Reichardt et al. (2020), Yan Li et al. (2020)). These technologies are also of strategic importance The fourth European Conference on the Structural Integrity of Additively Manufactured Materials (ESIAM26) Analysis of longitudinal fracture in moving functionally graded beam structure under creep conditions Victor Rizov* Department of Technical Mechanics, University of Architecture, Civil Engineering and Geodesy, 1 Chr. Smirnensky blvd., 1046 – Sofia, Bulgaria

* 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.2026.07.011