Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Computer Methods in Materials Science

1 2009

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: cohesive interface

Sortuj według:

Ogranicz wyniki do:

Failure modeling of friction stir welded joints in tensile tests

Borino G., Fratini L., Parrinello F., Burgarella A.

Computer Methods in Materials Science

2009

Vol. 9, No. 1

37-42

The paper concerns with the mechanical modeling and the finite element simulation of the fracture failure in mode I of linear joints of aluminum friction stir weldings. The problem is analyzed employing a bulk finite strain-hardening plasticity model able to characterize the spatial diffuse plastic strains that initially develop in the neighboring extended zones of the welding line. Moreover, the decohesion process is described by a zero thickness interface model which is spatially inserted along the line of the welding. The interface is basically an elastic - cohesive fracture model which is rooted on the concept of Interface Damage Mechanics (IDM) and is able to properly describes a progressive elastic degradation of the internal ligaments of the friction stir welding up to local decohesion and eventually at the welding failure. The damage constitutive model of the zero thickness interface is derived following a thermodynamically consistent formulation in which the surface properties are derived projecting along a fictitious surface elastic and inelastic material properties and deformation mechanisms. Bulk and interface constitutive parameters identification problem is also addressed. To this aim laboratory direct traction experimental tests have been carried out on FSW butt joints and their results have been analyzed either, for local aspects related to the material properties and failure, or for the overall structural behavior of the specimens. Finally the finite element implementation of the bulk and interface models is discussed and the related numerical results are analyzed in details.

Artykuł dotyczy mechanicznego modelowania i symi metodą elementów skończonych powstawania pęknięć w połączeniach spawanych aluminium uzyskanych metodą zgrzewania tarciowego z mieszaniem materiału zgrzeiny. Problem zostałprzeanalizowany za pomocą modelu odkształceń skończonych, który określa przestrzenną propagację odkształceń plastycznych zapoczątkowaną w sąsiedztwie wydłużonych stref linii spawu. Ponadto, w symulacji uwzględniono model rozwarstwiania materiału wzdłuż linii spawu.