This study presents an alternative approach for the absorption of impact energy that uses the internal pressurization of structures in the framework of a crash-adaptive response. Numerical simulations were conducted on axial impact of thin-walled tubular structures with circular cross section that serve as an approximation to a front crash box of a motor vehicle. The main objective of this work consists in studying the effect of internal pressurization of tubular structures in a crashworthiness application, as well as the possibility to obtain a reduction in wall thickness thus improving weight efficiency. A numerical study is presented for an internal pressure of 20 bar and tubular structures of circular section and 1.14 mm thickness. Numerical simulations were performed recurring to LS-DYNA explicit dynamics software while considering for the material a stainless steel alloy that is a material with interest for crashworthiness applications and manufacturing requisites due to its balance between strength, ductility and energy absorption. The results obtained allow concluding that recurring to internal pressurization it is feasible to reduce the wall thickness and have an impact resistance identical to the original while improving overall efficiency.
Numerical simulation of impact behaviour of structures with response adapted to the intensity of shock
Numerische Simulation einer Stoßwirkung von Strukturen mit einer an die Schockintensität angepassten Reaktion
Materialwissenschaft und Werkstofftechnik ; 44 , 10 ; 856-860
2013
5 Seiten, 7 Bilder, 5 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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