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INFLUENCE OF LOADING RATE ON THE STRENGTH AND DEFORMATIONS OF SHEET METAL STRUCTURES TAKING THE VEHICLE AS AN EXAMPLE

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

Some time ago the theory was held that a safe car must necessarily be heavy. In the last few years this idea has changed as the result of world-wide safety research work. Heavily armoured cars do not give the best possible protection for all road users. Safety requirements must be considered in several different areas: frequency of accidents, occupant protection and the protection of other road users. If too much emphasis is placed on one area, this results in disadvantages in other areas. An extremely heavy vehicle gives a high degree of occupant protection, but also presents special dangers to any lighter, weaker vehicle with which it may collide. Light vehicles tend to be involved in fewer traffic accidents. From this we may conclude one primary safety requirement: vehicles must be both light and safe. The need for light construction in present circumstances is further demonstrated by the following undisputed advantages: light construction reduces fuel consumption and thus the consumption of oil reserves; it reduces total emission levels; it involves the use of less material and thus reduces raw material consumption. The power to weight ratio is also improved. The task of the automobile engineer is therefore to construct light vehicles which have the same service life as a heavy vehicle and also offer a high degree of occupant protection. Brief loading peaks occur frequently during normal road operation and the loading of body components in collisions results in high rates of deformation, so it is essential that the automobile designer is thoroughly familiar with the effects of the rate of load application on the rigidity and deformation characteristics of sheet metal structures. The paper explains the yield stress and ultimate stress characteristics of sheet metal and shows how these characteristics are influenced by temperature, rate of load application and multiaxial stress state. The paper discusses the influence of the rate of load application for different types of loading and illustrates in particular how the most desirable kinds of deformation (folding) can be achieved on body parts which are subjected to compressive loads in order to ensure maximum energy absorption under the loadings which are likely to arise in a collision. /Author/TRRL/

  • Corporate Authors:

    International Federation of Auto Techniques Engs

    3 Avenue du President Wilson
    F 75116 Paris,   France 
  • Authors:
    • Wimmer, A
  • Publication Date: 0

Language

  • German

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00165661
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Mar 14 1978 12:00AM