Hydrogen Diffusion, Migration Of Dislocations And The Mechanism Of Flakes Formation In Metallic Materials

Abstract:

In metallic materials, even in single crystals, the microstructure is influenced by heterogeneities as inclusions, micro-cracks, grain boundaries and dislocations. The theoretical treatment of such homogeneities in materials deal to a new concept of the driving forces (configurational forces, material forces), developed on the virtual displacements or velocities of the defects. M. E. Gurtin show that the balance of configurational forces is an autonomous law of nature, in contrast to the original worksof Eshelby which say that the constitutive assumptions of the bulk material yields tothe expression of the configurational forces. We deduce the tractional forces developedon the crack tip and we indicate a manner of calculation of configurational forces.

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