How do you develop and validate a crash simulation model for reliable predictions?

Crash model development involves: Building accurate geometry from CAD with proper mesh quality (5-10mm elements for deforming regions), material characterization using high-strain-rate test data, joint modeling reflecting actual behavior (spotwelds, adhesives, mechanical fasteners), mass distribution matching physical prototype, and barrier/dummy modeling per protocols. Validation uses component tests (crush tubes, joints), subsystem tests (front structure), and full vehicle crash. Correlation targets include deformation modes, acceleration pulses (typically <10% error), intrusion measurements, and dummy injuries. Model updates address discrepancies, with documented predictive capability limits.