Advanced computation tools, like the Finite Element (F.E.) codes have been developed and are nowadays extensively adopted in the car industry at the design stage for the structural calculation and prediction of collision effects; similar numerical computations are adopted for the prediction of collision against road safety barriers. For a more reliable application of these codes however, there is a need for studies concerning the basic physical knowledge of the response of the car and road safety structures to impact loadings. The aim of the present paper is to show that long, slender Hopkinson bar systems are the proper equipment for the generation, application and correct measurement of impact loading pulses of programmed intensity, duration and rise time, needed for testing of car and road safety structures against crash. The correctness of the measurement is physically founded on the ability of the Hopkinson bar equipment to guide and propagate without distortion, absorption and superposition, both the loading and the response pulses. In fact the Hopkinson bar equipment realizes the conditions of undistorted uniaxial propagation of elastic stress pulses which is actually well described by the theory also.
Large Hopkinson bar experiments for the validation of numerical crash computations for car and road safety structures
Umfangreiche Hopkinson Stab Untersuchungen zur Validation numerischer Aufprallberechnungen bei Automobilen und Straßensicherheitsbauten
1993
8 Seiten, 6 Bilder, 7 Quellen
Conference paper
English
Finite-Elemente-Methode , Automobil , Straßenverkehr , Aufprall , Sicherheitseinrichtung , Aufprallversuch , Automobilindustrie , Bauweise , Konstruktionsdaten , Zusammenstoß , physikalische Eigenschaft , Stoßlast , Gitterstab , Kraftmessung , Impuls , Torsion , elastische Eigenschaft , mechanische Spannung
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