Actually, new materials (high strength steel, aluminium) and new joining methods (spot weld-bonding, clinching, toxing, riveting) get an increasing importance in body engineering due to the demands of weight and cost reduction in automotive industry. At the same time manufacturers and customers demands on passive safety are growing. Thin-walled columns are basic components in the concept and design of automotive body structures. Their crashworthiness behaviour is of fundamental importance in the safety design of the whole vehicle because their plastic collapse is the mechanism that is used to dissipate the kinetic energy of the vehicle in case of an accident. The mechanism of plastic collapse should be reliable and its evolution during the crash regular so that the desired quantity of absorbed energy, a low load unifority and the required level of deformation load can be achieved without larger danger for the vehivcle passengers. For predicting the characteristic values of automotive front structures energy absorption, e.g. weight specific energy absorption, load uniformity and structural effectiveness, the buckling of thin-walled columns, representing body front side members, were investigated in an experimental study. Actually used geometries for front side members like closed-hat, double-U and octagonal columns made by conventional steel, high strength steel and light alloys were joined with different joining methods e.g. spot-welding, press joining and structural adhesive. The design parameters of the specimen (t/a-ratio, flange width, joining width, material thickness, etc.) were varied in a wide range. Axial and non-axial quasistatic tests and even dynamic tests with different collision speeds were carried out.
Predicting the crashwortiness of vehicle structures made by lightweight design materials and innovative joining methods
Vorhersage der Verformungsfähigkeit von Fahrzeugkonstruktionen durch Leichtbaumaterialien und innovative Verbindungsmethoden
1995
24 Seiten, 23 Bilder, 3 Tabellen
Conference paper
English
Verformung , Automobilindustrie , Karosserie , Rahmen (Fahrzeug) , Aufprallversuch , Nietverbindung , Pressverbindung , Punktschweißen , Säule (Apparateteil) , Fahrzeugsicherheit , Zusammenstoß , Energieaufnahme , Metallkleben , kinetische Energie , hochfester Stahl , Leichtmetalle , Leichtbauweise , Verformungsfähigkeit
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