Surface in Fatigue/Wear Loadings and Damage Developments

Dear Colleagues,

The surface of metallic materials and/or multi-materials play an important role in the life of industrial components and/or systems, especially when they are subject to cyclic transient thermal and mechanical loadings. These solicitations damage the materials through the various mechanisms that are generally in interaction and through coupling with thermo-chemical reactions (oxidation/corrosion). Moreover, the surfaces of the components that are in relative movement with other bodies are damaged by even the more complex interactions between fatigue/wear/oxidation (and/or corrosion). The behaviour of the sub-surfaces is singular. On one hand, dislocations can leave the material by escaping out the free surface and forming extrusions/intrusions or roughening the surface. On the other hand, thermo-chemical reactions with oxygen when coupling with thermo-mechanical straining/stressing can alter the local mechanical properties and resistances. Sub-surfaces present another particularity, because the mechanical behaviour becomes very much crystallographic dependant (for example, grain orientation or morphological texturing). Under tribo-logical loadings, sub-surfaces self-accommodate to a high plastic shearing that can alter their microstructural features. As pre-existing defects, the micro-porosities and/or shrinkage, inherent of additive manufacturing, can drastically reduce the crack initiation life of the material and system resistances when they are well placed at/or near the free surfaces. Transient temperature gradients and thermo-chemical reactions transform the sub-surfaces to “composites-like” multi-layer materials with thermo-mechanical properties that should self-accommodate. Such evolutions need to be better evaluated and investigated. The constitutive laws based on crystallographic plasticity and multi-scale approaches require more emphasis, and should model the local behaviour of sub-surfaces and the localisation of plastic deformations.

Prof. Dr. Farhad Rezai-Aria
Guest Editor

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• fatigue
• wear
• metallic materials
• oxidation
• ALM
• behaviour constitutive laws
• life and damage modeling