How do you design load paths in a vehicle body structure for crash performance?

Load path design involves creating multiple continuous structural members that channel crash energy from impact point to reinforced nodes where energy is distributed and absorbed. For frontal crashes, primary paths run through front rails to rockers and floor; secondary paths through upper rails and A-pillars. Design principles include maintaining path continuity without sudden section changes, using branching to distribute loads, avoiding load path convergence that creates stress concentrations, and including trigger mechanisms for controlled collapse initiation. Analysis uses CAE simulation to verify energy flow and optimize member sizing.