A new study from North Carolina State University suggests that composite metal foam (CMF) could provide a major advance in automotive crash protection. Researchers found that replacing conventional front rails with equal-weight CMF structures could substantially improve vehicle crashworthiness.
At a simulated 55 mph frontal impact, CMF rails reduced maximum deceleration by about 38% and the Head Injury Criterion by 45% compared with double-octagonal aluminium rails. Against conventional rectangular steel rails, the reductions reached 84% and 83%, respectively.
CMF consists of hollow metal spheres embedded in a metallic matrix, combining low weight with strong impact-energy absorption. The study also indicates potential applications in electric vehicles, where the material could help protect high-voltage battery packs while resisting heat and fire.
The study is currently based on computer simulations rather than full-scale physical crash testing. Further experimental validation and development will be needed before CMF structures can be considered for production vehicles.
Why It Matters: The findings point towards a safety technology that could improve crash protection without adding weight, potentially enabling lighter and more efficient vehicle structures.
