Stress state characterization of ductile materials during scratch abrasion

Stress state characterization of ductile materials during scratch abrasion

Abrasive wear limits the lifetime of many machine components. Most empirical models relate the abrasive wear resistance to material hardness. In reality, however, other material properties are also influencing as scratch abrasion damage follows from a highly complex stress trajectory upon scratching...

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Bibliographic Details
Published in:Wear Vol. 476; p. 203712
Main Authors: Rajaraman, Dhanraj, Keim, Vincent, Pondicherry, Kannaki, Nonn, Aida, Hertelé, Stijn, Fauconnier, Dieter
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-07-2021
Elsevier Science Ltd
Subjects:
Abrasion
Abrasive wear
Damage assessment
Empirical analysis
Finite element analysis
Finite element method
Indentation
Lode angle
Material properties
Scratch abrasion
Scratching
Service life assessment
Stress state
Stress triaxiality
Wear resistance
Stress state
Finite element analysis
Lode angle
Scratch abrasion
Stress triaxiality
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Summary:Abrasive wear limits the lifetime of many machine components. Most empirical models relate the abrasive wear resistance to material hardness. In reality, however, other material properties are also influencing as scratch abrasion damage follows from a highly complex stress trajectory upon scratching. Numerical (finite element) simulation of scratch abrasion requires the use of a material damage model, which translates this stress trajectory into material degradation and removal. Most damage models include the first two stress invariants. However, fully incorporating the complex stress trajectories that occur during scratch abrasion may require damage models with dependence of the third deviatoric parameter (Lode angle). This paper serves as an a-priori study to evaluate the stress states that may occur during scratch abrasion. Three mechanisms (ploughing, wedging, cutting) are considered. Hereto, the results of an extensive parametric study using elastic-plastic finite element simulations of a scratch indentation process are discussed. Complex, non-proportional variations in stress state values are observed to occur during scratch abrasion. Distinct stress state trajectories are identified for the three abovementioned mechanisms. These variations are critically discussed to motivate a selection of suitable damage models for rigorous finite element analysis of the wear processes associated with scratch abrasion. •Stress state investigation associated with abrasion; ploughing, wedging & cutting.•Abrasion imposes non-proportional stress triaxiality and Lode angle.•Damage is predicted at stress triaxiality levels lower than −0.33.•3D nature of stress state causes Lode angle parameter to differ from zero.•Requirements for suitable continuum damage model for abrasion are presented.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2021.203712