PSI - Issue 34

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 34 (2021) 154–159

© 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 Esiam organisers Abstract The threshold range of the stress intensity factor for long cracks, ΔK th,LC , is a material property of paramount importance in several fracture mechanics-based models to estimate the mechanical thresholds of materials and components affected by short cracks or defects. However, the experimental determination of ΔK th,LC is expensive in terms of time and costs, and the estimating model proposed in the literature often requires material parameters that are not readily available in the design phase or provides quite large approximations. Recently, the authors calibrated an empirical bi-parametric model for evaluating ΔK th,LC for load ratios equal to -1, 0 and 0.5 which is applicable to several wrought as well as additively manufactured alloys. where the only parameters involved are the Vickers hardness (HV) and a properly defined microstructural length l . The model was calibrated using data found in the literature and proved to be effective for estimations of the ΔK th,LC within an error band of ±20% of a quite wide range of wrought and additively manufactured metals. © 2020 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 Esiam organisers Keywords: Threshold stress intensity factor; Long Crack; Vickers hardness; Microstructural length; Additive Manufacturing data found This is a The second European Conference on the Structural Integrity of Additively Manufactured Materials An engineering approach to estimate fatigue thresholds of wrought and additively manufactured defective metallic materials D. Rigon and G. Meneghetti* University of Padova, Department of Industrial Engineering, via Venezia 1 – 35131 Padova, Italy

Nomenclature l

material-dependent microstructural length parameter

R

load ratio (R= σ min /σ max )

* Corresponding author. Tel.: +39-049-8276751; fax: +39-049-8276785. E-mail address: giovanni.meneghetti@unipd.it

2452-3216 © 2020 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 Esiam organisers

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 Esiam organisers 10.1016/j.prostr.2021.12.022