Numerical and Experimental Study on Steel Members Retrofitted by Directed Energy Deposition

verfasst von

Hamid Dahaghin, Hessam Moshayedi, Niels Pichler, Lingzhen Li, Maryam Mohri, Chenglei Diao, Masoud Motavalli, Seyed Mehdi Zahrai, Elyas Ghafoori

Abstract

Wire and arc additive manufacturing (WAAM) is a versatile technology with applications ranging from manufacturing to the strengthening and repair of aging components. This paper investigates the effectiveness of strengthening techniques using WAAM through both numerical simulations and experimental observations. A thermo-mechanical analysis is employed to predict the temperature and stress fields in repaired specimens. The results show that original cracks in the plate are arrested due to compressive residual stresses generated at the crack tip due to the WAAM process, as well as the increased stiffness around the cracked region. However, new cracks initiate at the edge of the plate/WAAM-material interface which corresponds to the high-stress state in the region. This issue is mitigated significantly by machining the WAAM sample into a pyramid shape, resulting in infinite life for the strengthened plate under fatigue loading. Fractography analysis aids in better understanding the mechanism of sample failure. In conclusion, the results underscore the potential of WAAM repair, offering a hopeful outlook for the future of steel structure maintenance by presenting it as a promising method for mitigating fatigue-induced damage in steel structures.

Organisationseinheit(en)

Institut für Stahlbau

Externe Organisation(en)

University of Tehran
Eidgenössische Materialprüfungs- und Forschungsanstalt (EMPA)
ETH Zürich
Hong Kong Polytechnic University
WAAM3D Limited

Typ

Konferenzaufsatz in Fachzeitschrift

Journal

Procedia Structural Integrity

Band

64

Seiten

1192-1199

Anzahl der Seiten

8

ISSN

2452-3216

Publikationsdatum

2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Tief- und Ingenieurbau, Allgemeine Materialwissenschaften, Werkstoffmechanik, Maschinenbau

Ziele für nachhaltige Entwicklung

SDG 3 – Gute Gesundheit und Wohlergehen

Elektronische Version(en)

https://doi.org/10.1016/j.prostr.2024.09.166 (Zugang: Offen)