PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2019) 000 – 000 il l li i i

.

.

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 42 (2022) 1591–1599

23 European Conference on Fracture - ECF23 Ranges of Influence of the Stress Invariants and Hardening:

Monotonic and Cyclic Applications Lucas Mangas Araújo a and Lucival Malcher b a ival b

,

,

,

,

.

. . .

a Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK, email:lucas.mangasaraujo@jesus.ox.ac.uk b Department of Mechanical Engineering, University of Brasilia, 70910-900 Brasilia, DF, Brazil, email: malcher@unb.br , , , , , .

© 2022 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 23 European Conference on Fracture – ECF23 Abstract The objective the present work is to evaluate the effects of the stress invariants 1 and 3 on the mechanical behavior of metallic materials. In this regard, the Ductile Fracture (monotonic) and Ultra-Low (ULCF) fatigue behavior of SAE 1045 steel was analyzed supported by the experimental information furnished by Bai [1]. Furthermore, a Gao-based model [3] with mixed (isotropic and kinematic) hardening was proposed to capture 1 and 3 influences. The numerical simulations conducted assuming von Mises behavior did not describe properly the mechanical response from Ductile Fracture and ULCF data, which demonstrated the SAE 1045 steel dependence on 1 and 3 . After the calibration of Gao’s, and parameters, the numeric responses provided better agreement with respect to experiments. Interestingly, and were affected by the hardening type considered. (E.N, F.C., L., & J.A., 2014) © 2020 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 23 European Conference on Fracture - ECF23 Keywords: Stress Invariants, Ductile Fracture, Fatigue 1. Introduction Ductile fracture and Fatigue are major topics in engineering as they are fundamental for the design of several components and structures. To properly predict the mechanical behavior of materials, one needs to use an adequate constitutive model. For Ductile Fracture and Fatigue (especially the ultra-low and low cycle regimes), one is particularly interested in modeling the elastoplastic behavior of metallic materials. The most well-known formulations are the ones based on von Mises yield criterion [4], also called 2 -based approaches. These techniques are widely employed by engineers and researchers to predict the elastoplastic response of engineering alloys near to fracture and to obtain stress amplitudes, which are vital for fatigue life assessments. The present work aims to show 1 3 mation furnished by Bai [1]. Furthermo s is an open , ,

.

. .

2452-3216 © 2020 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 23 European Conference on Fracture - ECF23 . .

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.201