Community Research and Development Information Service - CORDIS


Final report on Contract No 7210-PR/052, 1 July 1997 to 31 December 2000.

The data on sheet steel in the various design codes currently used in the automotive industry is based on tensile deformation under quasi-static loading conditions. Consequently, the information used ignores the strain-rate hardening benefits of certain steel grades which offer other benefits in terms of crash performance of automotive structures. Such information has been developed in this project, which is aimed at exploring the influences of both strain-rate effects and temperature on the mechanical properties of various grades and strength levels of sheet steel.

Dynamic tensile tests on mild steel, high-strength and polyphase steels indicated that mild steel grades were the most strain-rate sensitive of those studied. The closest correlation between tensile results and the impact performance of structures was noted with the energy absorbed to 10% elongation. The greatest strain-rate sensitivity with mild steel was attributed to the fact that bands of dislocations were noted at low strain-rates, whereas at higher strain-rates a greater density of dislocation was obtained. With high-strength steels a high dislocation density was noted independent of strain-rate. With high-strength steels failures were noted between the different phases present at high strain-rates.

Additional studies have included the development of mathematical predictions for the effects of temperature on mechanical properties, the development of design guidelines for 3-point and cantilever loading of structures, and an assessment of the effects of strain-rate on both formability and dent resistance.

Additional information

Authors: JONES T B, Corus UK Ltd, Port Talbot (GB);GUTH A, IFW Dresden (DE);SCHAEL I, University of Aachen (DE);GEOFFROY J-L, Sollac, Florange (FR);RIZZO L, CSM, Rome (IT)
Bibliographic Reference: EUR 20325 EN (2002), pp.209. Euro: 31.00
Availability: EUR-OP reference: KI-NA-20325-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3659-X
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