A novel calibration procedure of Johnson-Cook damage model parameters for simulation of scratch abrasion

Numerical simulation of scratch abrasion requires the use of a material damage model to simulate material degradation and removal. From our previous research, the stress state during scratch was found to show negative values of stress triaxiality and Lode angle parameter. However, models are “classi...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Wear 2023-09, Vol.528-529, p.204977, Article 204977
Hauptverfasser: Rajaraman, Dhanraj, Hertelé, Stijn, Fauconnier, Dieter
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Numerical simulation of scratch abrasion requires the use of a material damage model to simulate material degradation and removal. From our previous research, the stress state during scratch was found to show negative values of stress triaxiality and Lode angle parameter. However, models are “classically” calibrated using experiments with positive triaxiality and Lode angle parameter. In this work, a novel “scratch-based” calibration procedure is developed to acquire Johnson-Cook (JC) damage model parameters, using experimental scratch tests showing negative stress triaxiality and Lode angle parameter. An optimization procedure is used to obtain the parameters by minimizing the error between the experimental and numerical wear rates. Fracture loci obtained from both calibration procedures vary significantly, thus estimating different material losses. This highlights the importance of the calibration process of the damage model. The validity of the exponential Johnson-Cook fracture locus is questioned since it cannot account for accurate predictions under the entire range of stress triaxiality values covered in the paper. Hence, it may not be feasible for any calibration approach to obtain a single set of JC model parameters to accurately estimate the material loss for different cases of abrasion. •Damage implementation did not alter the stress state at the surface of scratch abrasion.•Calibration of Johnson-Cook damage model parameters for scratch abrasion simulation.•The validity of exponential fracture locus is questioned for scratch abrasion.•Exponential fracture locus cannot account for the range of triaxiality values.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2023.204977