PSI - Issue 77

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect International Conference on Structural Integrity The effect of gradient determination on the accuracy and performance of gradient-based fatigue damage parameters applied to scanned weld joint topologies Georg Veile a* , Daniel Klöss a , Julius Lotz b , Stefan Weihe a,b Abstract Scanning the topology of weld geometries has the potential to improve the performance and accuracy of fatigue life assessment. However, in previous studies it has been shown that gradient based fatigue damage parameters (FDP) can be very sensitive to small notch radii. In this case, some FDP (FFS and RM) overestimated the fatigue life, leading to non-conservative results. In this paper the influence of gradient determination on the fatigue life prediction is examined. The local shear and strain gradients were reevaluated with different approaches. Evaluating the gradients with an increased Δx lead to improved accuracy and a reductio n in non-conservatism. However, this approach also effected initially better performing FDP such as FDP FGF . Increasing Δx from 0.05 to 0.20 mm led to a decrease of approx. 50% in Sd. at all FDP. Gradient determination is not the sole causative for increased scatter in fatigue life prediction using scanned weld joint topologies. This indicates that the gradients may also not be the key to reduce scatter. International Conference on Structural Integrity The effect of gradient determination on the accuracy and performance of gradient-based fatigue damage parameters applied to scanned weld joint topologies Georg Veile a* , Daniel Klöss a , Julius Lotz b , Stefan Weihe a,b a MPA – University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany b IMWF – University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany Abstract Scanning the topology of weld geometries has the potential to improve the performance and accuracy of fatigue life assessment. However, in previous studies it has been shown that gradient based fatigue damage parameters (FDP) can be very sensitive to small notch radii. In this case, some FDP (FFS and RM) overestimated the fatigue life, leading to non-conservative results. In this paper the influence of gradient determination on the fatigue life prediction is examined. The local shear and strain gradients were reevaluated with different approaches. Evaluating the gradients with an increased Δx lead to improved accuracy and a reductio n in non-conservatism. However, this approach also effected initially better performing FDP such as FDP FGF . Increasing Δx from 0.05 to 0.20 mm led to a decrease of approx. 50% in Sd. at all FDP. Gradient determination is not the sole causative for increased scatter in fatigue life prediction using scanned weld joint topologies. This indicates that the gradients may also not be the key to reduce scatter. Procedia Structural Integrity 77 (2026) 348–356 © 2026 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 ICSI organizers © 2026 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) a MPA – University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany b IMWF – University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany

* Corresponding author. Tel.: +49 (0) 711-685-62657. E-mail address: georg.veile@mpa.uni-stuttgart.de © 2026 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 ICSI organizers

2452-3216 © 2026 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 ICSI organizers

* Corresponding author. Tel.: +49 (0) 711-685-62657. E-mail address: georg.veile@mpa.uni-stuttgart.de

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