Experimental and modeling investigation of the failure resistance of Advanced High Strength Steels spot welds

2011 ◽  
Vol 78 (10) ◽  
pp. 2259-2272 ◽  
Author(s):  
S. Dancette ◽  
D. Fabrègue ◽  
V. Massardier ◽  
J. Merlin ◽  
T. Dupuy ◽  
...  
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Failure Resistance ◽  
Advanced High Strength Steels

scholarly journals Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Metals ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 111 ◽  
Author(s):  
Thibaut Huin ◽  
Sylvain Dancette ◽  
Damien Fabrègue ◽  
Thomas Dupuy
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Advanced High Strength Steels

scholarly journals Spot Weld Strength Determination Using the Wedge Test: In Situ Observations and Coupled Simulations

2010 ◽  
Vol 24-25 ◽  
pp. 299-304 ◽  
Author(s):  
Rémi Lacroix ◽  
Joël Monatte ◽  
Arnaud Lens ◽  
Guillaume Kermouche ◽  
J.M. Bergheau ◽  
...  
Keyword(s):  
Energy Analysis ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Weld ◽  
Weld Strength ◽  
Spot Welds ◽  
Local Loading ◽  
Advanced High Strength Steels ◽  
Strength Determination

This paper describes an innovative way to characterize the strength of spot welds. A wedge test has been developed to generate interfacial failures in weldments and observe in-situ the crack propagation. An energy analysis quantifies the spot weld crack resistance. Finite Element calculations investigate the stresses and strains along the crack front. A comparison of the local loading state with experimentally observed crack fronts provides the necessary data for a failure criterion in spot weld fusion zones. The method is applied to spot welds of Advanced High Strength steels.

Investigations on the Mechanical Behavior of Advanced High Strength Steels Resistance Spot Welds in Cross Tension and Tensile Shear

2010 ◽  
Vol 89-91 ◽  
pp. 130-135 ◽  
Author(s):  
Sylvain Dancette ◽  
Véronique Massardier-Jourdan ◽  
Jacques Merlin ◽  
Damien Fabrègue ◽  
Thomas Dupuy
Keyword(s):  
Three Dimensional ◽  
High Strength Steels ◽  
Complex Loading ◽  
High Strength ◽  
Weld Strength ◽  
Tensile Shear ◽  
Spot Welds ◽  
Advanced High Strength Steels ◽  
Cross Tension ◽  
Failure Types

Advanced High Strength Steels (AHSS) are key materials in the conception of car body structures, permitting to reduce their weight while increasing their behavior in crash conditions. Nevertheless, the weldability of AHSS presents some particular aspects, in that complex failure types involving partial or full interfacial failure can be encountered more often than with conventional mild steels during destructive testing, despite high spot weld strength levels. This paper aims at characterizing the behavior of different AHSS spot welds under two quasi-static loading conditions, tensile shear and cross tension, often used in the automotive industry for the determination of their weldability. Interrupted cross tension and tensile shear tests were performed and spot welds failure was investigated with optical micrographs, SEM fractography and 3D-tomography in order to follow the three-dimensional crack paths due to the complex loading modes. A limited number of failure zones and damage mechanisms could be distinguished for all steel grades investigated. Moreover, numerical simulation of the tests was used to better understand the stress state in the weld and the influence of geometrical features such as weld size on the occurrence of the different failure types.

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