Investigation on the plasticity accumulation of Ti-6Al-4V fretting wear by decoupling the effects of wear and surface profile in finite element modelling

• Published in: Tribology international Vol. 113; pp. 448 - 459
• Main Authors: Mohd Tobi, A.L., Sun, W., Shipway, P.H.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2017; Elsevier BV
• Subjects: Accumulation; Contact stresses; Decoupling; Fatigue life; Finite element; Finite element analysis; Finite element method; Fretting wear; Impact analysis; Mathematical models; Plastic deformation; Plastic properties; Plasticity; Scars; Shear stress; Studies; Ti-6Al-4V; Titanium base alloys; Wear; Fretting wear; Ti-6Al-4V; Plasticity; Finite element
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2016.12.009

A finite-element-based wear modelling methodology and a computational device for decoupling wear effects is presented in this study. The decoupling of wear effects facilitates the capture of plasticity accumulation on a particular wear-scarring profile after a specific number of cycles. It was determined that significant plasticity accumulation due to plastic shakedown was predicted in a partial-slip case, while a saturation of plastic deformation was predicted in a gross-sliding case. It was also predicted that a significant amount of plasticity does not meaningfully contribute to the stress and strain range observed in the contact region. It was assumed that plasticity accumulation contributes towards wear of the material and feeds the stress changes, which indirectly affects fatigue life. •Accumulation of plastic strain in fretting without the active interaction of wear model in FE modelling is presented.•The model preserved the state conditions generated by the initial wear modelling.•The subsequent plasticity prediction is based solely on wear scar geometrical effect.•Plasticity accumulation contributes towards wear of the material and feeds the stress changes which affect the fatigue life.•Plasticity accumulation supports the development of W-shape wear scar in gross sliding fretting wear of Ti-6Al-4V.•Plastic strain accumulation at the stick-slip interface generates wear and crack widening in Ti-6Al-4V partial slip fretting.