Multiscale modeling of ductile failure in metallic alloys

作者：Pardoen Thomas^*; Scheyvaerts Florence; Simar Aude; Tekoglu Cihan; Onck Patrick R

来源：Comptes Rendus Physique, 2010, 11(3-4): 326-345.

DOI：10.1016/j.crhy.2010.07.012

• Ductile fracture
• Multiscale modelling
• Ductility
• Fracture toughness
• Damage
• Voids

Micromechanical models for ductile failure have been developed in the 1970s and 1980s essentially to address cracking in structural applications and complement the fracture mechanics approach. Later, this approach has become attractive for physical metallurgists interested by the prediction of failure during forming operations and as a guide for the design of more ductile and/or high-toughness microstructures. Nowadays, a realistic treatment of damage evolution in complex metallic microstructures is becoming feasible when sufficiently sophisticated constitutive laws are used within the context of a multilevel modelling strategy. The current understanding and the state of the art models for the nucleation, growth and coalescence of voids are reviewed with a focus on the underlying physics. Considerations are made about the introduction of the different length scales associated with the microstructure and damage process. Two applications of the methodology are then described to illustrate the potential of the current models. The first application concerns the competition between intergranular and transgranular ductile fracture in aluminum alloys involving soft precipitate free zones along the grain boundaries. The second application concerns the modeling of ductile failure in friction stir welded joints, a problem which also involves soft and hard zones, albeit at a larger scale.

• 出版日期2010-5