THE EFFECT OF THE RATE OF LOAD APPLICATION ON THE MECHANICAL RESISTANCE AND DEFORMATION CHARACTERISTICS OF SHEET METAL STRUCTURES FOR MOTOR VEHICLES

EINFLUSS DER BELASTUNGSGESCHWINDIGKEIT AUF DAS FESTIGKEITS- UND VERFORMUNGSVERHALTEN VON BLECHKONSTRUKTIONEN AM BEISPIEL VON KRAFTFAHRZEUGEN

The large number of fatal accidents throughout the world imposes a moral obligation on every automobile manufacturer to take steps of improving the accident prevention (for example handling characteristics and braking stability) and also the crashworthiness (i.e. the protection afforded to occupants in a collision) of their vehicles. The accident prevention can be considerably improved by the use of an extremely lightweight construction. The structural components of a vehicle are subjected to a high deformation rate in a road accident, and therefore the knowledge of the mechanical properties of body components at high rates of load application is necessary when designing a structure which is to be capable of converting an optimum amount of energy. The amount of energy which can be absorbed up to the point of fracture is important when designing crush zones. Brittlemess, even if it only occurs locally, considerably reduces the amount of energy which can be converted and so ductile behaviour under high rate of loading is desirable. The transition from ductile fracture to brittle fracture is determined by 3 factors: temperature, three-dimensional stress state and strain rate. Automobile body parts which are subjected to compressive loads, such as side members have to be determined according to the laws of elastic stability. If the critical buckling load is reached and if the proportion of wall thickness to width of a rectangular member is correct, it deforms in deforms in regular folds, thus making the best use of the material available. The paper describes the reasons of this regular folding the the transition from folding to buckling and irregular crumpling.

  • Corporate Authors:

    Franckhlsche Verlagshandlung

    Pfizerstrasse 5, Postfach 640
    7000 Stuttgart 1,   Germany 
  • Authors:
    • Wimmer, A
  • Publication Date: 1975-10

Media Info

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Filing Info

  • Accession Number: 00131965
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Files: TRIS
  • Created Date: Jun 5 1976 12:00AM