PSI - Issue 52

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 52 (2024) 382–390

Fracture, Damage and Structural Health Monitoring ‘‡ ’”‘„Ž‡• ‘ˆ ”‡Ž‹ƒ„‹Ž‹–› ‘ˆ •–”— –—”ƒŽ Š‡ƒŽ–Š ‘‹–‘”‹‰ Vitalijs Pavelko* Institute of Aeronautics, Riga Technical University, 6A Kipsalas Street LV-1048, Riga, Latvia

© 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 Professor Ferri Aliabadi Abstract Analysis of stress state and strength of piezoelectrical transducer (PET) in-built to structural component which loaded by static or cyclic load is done. All results and conclusions are applicable for thin PET of rectangular shape. The data of the fatigue test of reinforced Al-alloy panel and FEA results were used. The general statistical estimation of fatigue test data was made. The high probability of PET destruction at the cyclic load of typical level is shown for considered conditions. The detailed FEA of in-built PET stress state is performed, and in this base the development of brittle PET destruction at monotonically increasing load was predicted as equi-fragmental crushing (EFC) and its properties were described. The EFC process was adapted to PET destruction at cyclic load and used for construction of likelihood estimation (LHE) of the fatigue strength of PET. Using LHE model, the estimation of parameters of the normal distribution of the fatigue strength was obtained. The general comparison of in-built PET strength and PET at pure tension is given. © 2023 Vitalijs Pavelko. 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 Professor Ferri Aliabadi Keywords: Structural health monitoring; piezoelectric transducer; fatigue strength; stress state;parameters likalihood estimation; 1. Introduction The problem of the reliability of the sensitive components of the health structural monitoring (SHM) system is of the utmost importance. For monitoring systems based on the ultrasonic method this problem is especially relevant for piezoelectric transducers. It is known that these elements are built into the structure and in operation are subjected to the same external influences as the host structure. First, it is a dynamic load, which can cause damage or complete

* Vitalijs Pavelko. Tel.: +37167089333 fax: +37167089333. E-mail address: vitalijs.pavelko@rtu.lv

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 Professor Ferri Aliabadi

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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.038