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) 572–580

© 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 Commercial finite element software LS-Dyna® is used to perform the process simulation in 2D, followed by mapping to 3D with constant amplitude loading to investigate local stresses and strains within the contact region. The Local Strain Approach with damage parameter P SWT is applied to estimate the fatigue lives of the clinched joint variants. Fatigue life estimations obtained from simulation results are compared to those from experiments. © 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: Local Strain Approach; fatigue; crack initiation; clinched joint; aluminum alloy i l i it l t t i t t i l ti i , l i t it t t lit l i t i ti t l l t t i it i t t t i . l t i it t i li t ti t t ti li t li j i t i t . ti li ti ti t i i l ti lt t t i t . © 2 1 h Auth . bli b .V. This is n pen a ce ti le u th Y - D li nse ht p :/ cre ti c m s. /li / / . i i ilit t i ti i it t ti i i : l tr i r ; f ti ; r i iti ti ; li j i t; l i l FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Estimation of fatigue life for clinched joints with the Local Strain Approach Boris Spak a *, Maximilian Schlicht b , Karina Nowak b , Markus Kästner a , Pascal Froitzheim b , Wilko Flügge b , Melanie Fiedler a a Chair of Computational and Experimental Solid Mechanics, Technical University Dresden, 01069 Dresden, Germany b Fraunhofer Institute for Large Structures in Production Engineering IGP Abstract Widely used in automotive and aerospace industry, clinched joints are subject to failure due to neck fracture and disjoining if exposed to high static loads. For cyclic loading cases, the formation of eyebrow cracks can be observed. The main objective of ongoing research is the application of the Local Strain Approach to clinched joints joining extruded aluminum wrought alloy sheets, thus being able to predict crack initiation location and fatigue life. Complex geometrical features of a clinched joint and lacking of nondestructive methods to track local stresses and strains require a combined approach utilizing numerical and experimental techniques. Material characterization for an aluminum wrought alloy EN AW 6060T66 is accomplished by common uniaxial tension tests to determine flow curves and cyclic properties by strain controlled constant amplitude tests, respectively. a i f t ti l i t l li i , i l i it , , b f I tit t f t t i ti i i I i l i t ti i t , li j i t j t t il t t i j i i i t i t ti l . li l i , t ti . i j ti i i t li ti t l t i t li j i t j i i t l i t l t , i l t i t i iti ti l ti ti li . l t i l t li j i t l i t ti t t t l l t t i i i tili i i l i t l i . t i l t i ti l i t l i li i i l t i t t t t i l li ti t i t l t t lit t t , ti l . t t

* Boris Spak. Tel.: +49 351 463-37996; fax: +49 351 463-37969. E-mail address: boris.spak@gmx.de ri . l.: - ; f : - . - il : ri . .

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 - t r . li I . . i i rti l r t - - li ( t :/ r ti . r /li / - - / . ) r-r i r r i ilit f t i tifi it 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.2022.03.058