Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Haz model

A model to compute and simulate the Heat Affected Zones produced by welds has been developed, being able to compute the mechanical properties of these metallurgically hetereogeneous regions. It is possible to estimate hardness, yield strength, ultimate tensile strength as well as the toughness at the different regions from a very detailed microstructural description.

It is closely connected to other results of the project able to compute thermal profiles, microstructes, etc.

On the fracture model, a “weakest link” hypothesis is used. It is assumed that the “active zone” of the piece or specimen under load (its plastic zone) can be divided in a number of volume elements, so that the failure of one of them causes macroscopic failure of the piece.

Each volume element is characterized by its stress state, depending on the macroscopic loading state and by its (probably path dependent) plastic state. Then the fracture probability is obtained from the integral extended to the whole “active volume”, within the plastic region. Now, it is in the deduction of F where the necessary succession of microcrack nucleation at a particle, propagation through the particle/matrix boundary and further propagation through the first encountered grain boundary must be included.

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CEIT - Centro de Estudios e Investigaciones Técnicas de Gipuzkoa
Paseo de Manuel Lardizábal, 15
20018 San Sebastián
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