Abstract: Various structural features can be formed in the blank prior to welding opposing walls of a blank together to form a tubular member and/or can be formed simultaneously with forming a wall of the tubular wall. Transverse collapse initiating features can be formed by expanding the material of the wall. These features can be located in a corner portion that connects two side wall portions of the tubular member together and/or in a side wall portion thereof. In cases where both are provided, the side wall and corner collapse initiating features can be aligned with each other. Another portion of the wall material can be free of strain hardening and/or material thinning. A blank for the tubular member can be formed from sub-blanks welded together, can have non-parallel opposing side edges, and/or can have different thickness and/or different material portions.