Crashworthiness is the most important requirement when designing automobiles, because it is directly linked to safety of passengers. Crashworthiness of a car is affected by material, structure, safety device and crash conditions. POSCO conducts researches on dynamic material properties, crashworthiness of automotive parts and crashworthiness of auto-body based on crash simulations.
When an auto-body is deformed by crash accidents, materials of the auto-body are rapidly deformed. Strength of materials generally depends on strain rates. Steel has excellent characteristics for increasement of the strength by strain rates when compared to other materials. POSCO has established the database (DB) for dynamic materials to perform crash simulations and provid dynamic material data to POSCO’s customers.
Crash tests of automotive parts are not carried out often whereas crash tests of a full vehicle are performed in developing a new car. Thus, POSCO has developed its own high speed crash tester to conduct crash tests on high speed compression and bending for automotive parts and simplified specimens. Crashworthiness such as energy absorption and fracture, collapse mode, reaction force, and mean load are evaluated to provide reference data for car design.
The primary purpose of vehicle crash analysis is to propose appropriate steels to POSCO’s customers. POSCO participates in new car development of customers as EVI activities to propose appropriate steels based on the results of crash simulations. Furthermore, new steels developed by POSCO such as AHSS (Advanced High Strength Steel) are applied to automotive parts in order to enhance the lightweight and crashworthiness.