PSI - Issue 42

Available online at www.sciencedirect.com

ScienceDirect

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 42 (2022) 1467–1474

23 European Conference on Fracture - ECF23

Structural Integrity Problems of Ageing Large-Scale Systems

Tamás Fekete a, *, Éva Feketéné-Szakos b

a Centre for Energy Research, Konkoly-Thege M. str. 29-33., H-1121 Budapest b Budapest University of Technology and Economics, Department of Technical Pedagogy, Magyar Tudósok krt. 2., H-1117 Budapest

Abstract

© 2022 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 23 European Conference on Fracture – ECF23 Ageing of all kinds of systems is commonly observed in nature; it seems inevitable. Most basic models of mechanical engineering were developed in the reversible mechanics framework of the late 19 th century and therefore are not suitable for describing ageing. Dynamic ageing models are much needed to predict the safe operating limits of Large-Scale Engineering Systems reliably. Generalized models for Structural Integrity assessments of such systems are in the focus of research at the Centre for Energy Research in Hungary. In this article, some recent results from the research are summarized. © 2020 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 responsibility of 23 European Conference on Fracture - ECF23 Keywords: Thermodynamics; Fracture Mechanics; Ageing; Catastrophe theory; Structural Integrity of Large-Scale Systems

1. Introduction

It is a general experience that any man-made system is only fit for its intended function for a limited period of time. Large-Scale Systems ( LSS s) –e.g., power- and chemical plants, bridges, etc.– are thus designed for a restricted Service-Lifetime ( SL ). This can be decades, nowadays ranging from 40 to 60 Years of Operation ( YO ). While experience gained over the past decades shows that –under appropriate conditions– the SL of an LSS can be extended up to 1.5 times the Design Service-Lifetime ( DSL ), the rare disasters warn that much more work is needed. Structural Integrity ( SI ) is the scientific-engineering discipline that aims to determine the conditions and the expected duration (the Technically Allowable Lifetime ( TAL )) for which global system stability can be guaranteed.

* Corresponding author. Tel.: +36-1-392-2222/3403; fax: +36-1-395-9293. E-mail address: fekete.tamas@ek-cer.hu

2452-3216 © 2020 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 responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.187