Dynamic behavior and failure of the base and heat affected materials of a HSS fillet welded joint

Julien Carrier (1, 2) , Eric Markiewicz (1) , Grégory Haugou (1) , David Lebaillif (2) , Nicolas Leconte (1) , Hakim Naceur (1)

1 LAMIH - Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201
2 NEXTER Systems

Welded joints, due to their manufacturing process, are commonly weakened areas. This study analyses the dynamic behavior of the Base Metal (BM) and the Heat-Affected Zone (HAZ) materials of a HSS (High Strength Steel) fillet welded joint. First, a specific approach is developed to generate the HAZ material using a thermal treatment. Hardness and grain size are used to validate the replicated HAZ. This approach appears efficient and repeatable. Secondly, the true stress-strain quasi-static and dynamic behaviors up to failure of the BM and the HAZ are determined. This characterization is performed thanks to video tracking procedure and Bridgman-LeRoy correction. The comparison between these two materials shows that the thermal field of the welding process increases the HAZ yield stress and hardening while decreasing the strain at failure. It appears that the base metal is not rate sensitive from quasi-static up to 1350 s-1. On the contrary, the heat affected material appears to be rate sensitive but by softening. This unexpected dynamic material softening requires further analyses

Domaines: Mécanique [physics.med-ph]

Julien Carrier, Eric Markiewicz, Grégory Haugou, David Lebaillif, Nicolas Leconte, et al.. Dynamic behavior and failure of the base and heat affected materials of a HSS fillet welded joint. DYMAT 2015 - 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, Sep 2015, Lugano, Switzerland. pp.05011, ⟨10.1051/epjconf/20159405011⟩. ⟨hal-03433914⟩