PSI - Issue 22

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

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 22 (2019) 10–16

© 2019 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 the First International Symposium on Risk and Safety of Complex Structures and Components organizers © 2019 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 the First International Symposium on Risk and Safety of Complex Structures and Components organizers Ab tr ct This paper addr ss s the fa gue beh v r of AISI 18Ni300 samples manufactured b s lective lase m lting under both constant a variable-amplitude loading. The fa igue campaig encompasses a series of low-cycle strain-controlle fatigu ests performed under fully-reversed con itions at vari us strain amplitud s, and a series of high-cyc e stress-contr lled fatigu test performed under pulsating conditions at various str ss ranges onsiderin both con tant- and variable-amp itude lo ding spectra. Fatigue life predictions are performed on the basis of the SWT parameter along with the Miner’s law. This approach has demonstrated to be sufficiently reliable to predict the lifetime expectancy n maraging st el samples produced by selective laser melting. © 2019 The Authors. Publ shed by Elsev er B.V.This is an open access article u er the CC BY-NC-ND li ense (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organ zers First International Symposium on Risk and Safety of Complex Structures and Components Fatigue behaviour of maraging steel samples produced by SLM under constant and variable amplitude loading R. Branco a *, J. Silva a , J. Martins Ferreira a , J.D. Costa a , C. Capela a,b , F. Berto c L. Santos a , F.V. Antunes a a CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Coimbra, 3030-788 Coimbra, Portugal b Department of Mechanical Engineering, ESTG, Polytechnic Institute of Leiria, Morro do Lena - Alto Vieiro, Leiria, 2411-901 Leiria, Portugal c Department of Mechanical and Industrial Engineering, NTNU, 7491 Trondheim, Norway Abstract This paper addresses the fatigue behaviour of AISI 18Ni300 samples manufactured by selective laser melting under both constant- and variable-amplitude loading. The fatigue campaign encompasses a series of low-cycle strain-controlled fatigue tests performed under fully-reversed conditions at various strain amplitudes, and a series of high-cycle stress-controlled fatigue tests performed under pulsating conditions at various stress ranges considering both constant- and variable-amplitude loading spectra. Fatigue life predictions are performed on the basis of the SWT parameter along with the Miner’s law. This approach has demonstrated to be sufficiently reliable to predict the lifetime expectancy in maraging steel samples produced by selective laser melting. First International Symposium on Risk and Safety of Complex Structures and Components Fatigue behaviour of maraging steel sa ples produced by SLM under constant and variable amplitude loading R. Branco a *, J. Silva a , J. Martins Ferreira a , J.D. Costa a , C. Capela a,b , F. Berto c L. Santos a , F.V. Antunes a a CEMMPRE, Departme t of Mechanical Engineering, Univ rsity of Coimbra, Coimbra, 3030-788 Coimbra, Portugal b Department of Mechanical Engineering, ESTG, Polytech ic Institute of Leiria, Mor do Lena - Alto Vieiro, Leiria, 2411-901 Leiria, Portugal c Department of Mechanical and Industrial Engineering, NTNU, 7491 Trondheim, Norway Keywords: AISI 18Ni300; maraging steel; selective laser melting; variable-amplitude loadig, fatigue life prediction

Keywords: AISI 18Ni300; maraging steel; selective laser melting; variable-amplitude loadig, fatigue life prediction

* Corresponding author. Tel.: +351-239-790-700; fax: +351-239-403-407. E-mail address: ricardo.branco@dem.uc.pt

2452-3216 © 2019 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 statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 2452 3216 © 2019 The Autho s. Published by Elsevier B.V.This is an open acc ss rticle under the CC BY-NC-ND license (http://c ativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers * Corresponding author. Tel.: +351-239-790-700; fax: +351-239-403-407. E mail address: ricardo.branco@dem.uc.pt

2452-3216 © 2019 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 the First International Symposium on Risk and Safety of Complex Structures and Components organizers 10.1016/j.prostr.2020.01.002