PSI - Issue 38

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000–000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ScienceDirect il l li t . i i t.

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ScienceDirect

Procedia Structural Integrity 38 (2022) 60–69

© 2021 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 Fatigue Design 2021 Organizers The properties of a specimen vary depending on the building direction and the building parameters. Furthermore, due to the manufacturing process, the parts show especially high surface roughness, isolated defects at overall low porosity and significant macroscopic residual stresses in the unprocessed state. As it is not always possible to alter these features, it seems advisable to incorporate them in a fatigue model for SLM specimens, especially as these are the decisive features regarding fatigue strength. Estimation of the fatigue limit is carried out via the defect stress gradient (DSG) approach and a Weibull distribution. Both approaches are capable to include the aforementioned features and are therefore used and compared for the fatigue strength calculations of 316L produced via SLM. © 2021 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 Fatigue Design 2021 Organizers Keywords: "Additive manufacturing; selective laser melting; fatigue; defect stress gradient; Weibull distribution" t il i i ti t il i t . t , t t t i , t t i ll i , i l t t t ll l it i i i t macroscopic residual stresses in the unprocessed state. As it is not always possible to alter these features, it seems advisable to i t t i ti l i , i ll t t i i t i ti t t . ti ti t ti li it i i t i t t t i t i ll i t i ti . t l t i l t ti t t t ti t t l l ti i . t . li . . i i ti l t li tt :// ti . /li / / . i i ilit t i ti i itt t ti i i : iti f t ri ; l ti l r lti ; f ti ; f t tr r i t; i ll i tri ti FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Comparison of different approaches to model fatigue for additively manufactured specimens considering production-related characteristics Michaela Zeißig a, *, Frank Jablonski b a Bremen Institute for Mechanical Engineering (bime), University of Bremen, Am Biologischen Garten 2, 28359 Bremen, Germany b University of Applied Sciences Bremen, Faculty 5, Neustadtswall 30, 28199 Bremen, Germany Abstract Additive manufacturing processes such as selective laser melting (SLM) gain more and more importance and are already applied in various industries ranging e.g. from aerospace to automotive. However, in order to further spread their distribution among the common manufacturing technologies, reliable material data is required. While static material data for various materials is available in literature, fatigue data is comparably scarce. ufact Michaela Zeißig a, *, Frank Jablonski a I tit t f i l i i ( i ), i it f , i l i t , , b i it f li i , lt , t t ll , , iti t i l ti l lti i i t l li i i i t i i . . t t ti . , i t t t i i t i ti t t i t l i , li l t i l t i i . il t ti t i l t i t i l i il l i lit t , ti t i l . ti i i

* Corresponding author. Tel.: +49-421-218-64685 E-mail address: mzeissig@uni-bremen.de i t r. l.: - - - - il : i i i- r . rr

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2452-3216 © 2021 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 Fatigue Design 2021 Organizers i i rti l r t - - li ( tt :// r ti . r /li / - - / . ) r-r i r r i ilit f t i tifi itt f t ti i r i r

2452-3216 © 2021 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 Fatigue Design 2021 Organizers 10.1016/j.prostr.2022.03.007