Modeling of deformation and failure behavior of dissimilar resistance spot welded joints under shear,axial and combined loading conditions
This paper presents the modeling of deformation and failure behavior of dissimilar resistance spot welded joints (RSW) between hot-stamped ultra-high strength (22MnB5) and microalloyed (HC340LAD) steels.To determine the deformation and failure behavior of the different material zones of the weld,tensile and shear specimens,which were cut from the base metals,the weld nugget and heat treated sheets were tested and modeled using the Gologanu-Leblond model coupled with the fracture criteria of Thomason and Embury.The joints were modeled using detailed 3-dimensional finite element models taking into account the different weld zones,i.e.base metal (BM),heat affected zones (HAZ) and weld metal (WM),their dimensions and their mechanical properties.Simulations of the spot welded joints behavior under shear,axial and combined axial and shear loading were carried out and compared to experimental results such as force vs.displacement curves,load bearing capacities,fracture mode and fracture locations.Maximum loads and force vs.displacement curves from experiments and simulations showed good agreements for all loading situations examined.Despite of its superior strength compared to the microalloyed steel,pull-out fracture of the joints took place in the coarse grain HAZ of the hot-stamped ultra-high strength steel in experiments and simulations.
Resistance spot welding Mechanical properties Combined loading Failure criterion Ultra-high strength steel
Sebastian Burget Silke Sommer
Crash-Safety,Damage Mechanics,Fraunhofer-Institute for Mechanics of Materials IWM,79108 Freiburg,Germany
国际会议
北京
英文
1-12
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）