Ductile Patch B-Pillar Structure for Controlled Lateral Impact Deformation

The patent applies local quality by creating a ductility gradient within the B-pillar structure. A higher-ductility patch is strategically positioned only in the controlled intrusion zone where shock absorption is needed, while the rest of the B-pillar maintains high-strength material properties. This localized application of different material properties allows the structure to absorb impact energy in specific regions without compromising overall structural integrity.

The patent employs composite materials by combining two different steel grades with distinct ductility characteristics. The high-strength steel provides structural integrity and load-bearing capacity, while the higher-ductility steel patch provides controlled deformation and energy absorption. This composite approach creates a multi-functional B-pillar that simultaneously achieves strength and controlled ductility in different regions.

The patent merges the reinforcement function directly into the B-pillar structure by integrating the higher-ductility patch as an inherent component during the forming process. Instead of adding separate reinforcing members that would increase weight and complexity, the ductile patch is welded to the blank before forming, creating a unified structure where the patch and blank together form the load-bearing B-pillar. This integration eliminates the need for additional discrete reinforcement elements.

The patent applies preliminary action by pre-welding the higher-ductility patch to the blank before the forming process. This preliminary preparation ensures that the ductile reinforcement is already in place to prevent breakage during subsequent forming operations and to provide structural integrity before the component is installed in the vehicle, avoiding the need for post-assembly reinforcement additions.