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This report deals with the strain rate sensitivity of tensile and toughness properties for modern structural steels. For the tensile properties, general trends have been drawn, displaying a reduced sensitivity for the new steels. For toughness, instrumented tests have shown a lower strain rate sensitivity of the modern steels, but technical limitations have not allowed testing of all the steels directly.

Starting from the idea that a same phenomenon of thermal activation affects simultaneously the variations of the yield point and the shifts of transition temperatures, another approach has been developed from the 'tensile' model proposed by Dahl. Parameters of the empirical formulas have been integrated in this model that gives new trend lines for the toughness behaviours of steel families. These trend lines appear more realistic than the former ones and agree better with the experimental data.

Finally, the results show that the Barsom-Rolfe's correction was rather satisfactory for mild steels and very high-strength steels, while the case of medium-strength steels with high toughness had to be revised, for a drift of about 20 degrees Celsius.

The parallelism which exists between the variations of the lower yield point as a function of the strain rate and those of the toughness transition temperature following the same strain rate constitutes in our view a very interesting approach, even if it has been investigated only on a small number of steels. But one cannot claim, at the present time, that this is generally applicable to all steels. However, this technique gives an alternative when the direct testing presents some difficulties, as was the case in this work.

Additional information

Authors: HAEYER R.D, CRM Rue E Solvay, Liege, (BE)
Bibliographic Reference: EUR 19329 EN (2000), 90pp, Euro: 13.00
Availability: Available from European Commission, DG XII Communication Unit rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Tel: +32-2-2950001 Fax:+32-2-2958220 email:
ISBN: ISBN 92-828-9001-5
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