Cadoni, Ezio and Forni, Daniele
(2019)
Mechanical behaviour of a very-high strength steel (S960QL) under extreme conditions of high strain rates and elevated temperatures.
Abstract
The lack of full stress-strain data sets under the coupled effect of high strain rates and elevated temperatures is one of the main concerns in a multi-hazard (blast and fire) approach of very-high strength steel (VHSS) structures. The main research challenge is represented by the assessment of the strain rate behaviour in tension and in a wide range of temperatures of a very-high strength steel (S960QL). For this purpose a split Hopkinson tensile bar equipped with a water-cooled induction heating system is used for the mechanical characterisation at high strain rates (250 s−1, 500 s−1 and 950 s−1) and in a wide range of temperatures (20 ∘C, 400 ∘C, 550 ∘C, 700 ∘C and 900 ∘C). A special focus on the influence of the relative sample position in thickness such as core and peripheral material was examined. A comparison between reduction factors of main mechanical properties, in both dynamic and quasi-static conditions, is presented.In addition, some predictive equations were developed to define the dynamic strength decrease with increasing temperatures. Finally, the constitutive parameters of the Johnson-Cook strength model for both core and peripheral materials were reported.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Subjects: | Engineering > Civil engineering Engineering > Civil engineering > Structural engineering |
| Department/unit: | Dipartimento ambiente costruzioni e design > Laboratorio Dynamat |
| Depositing User: | Ezio Cadoni |
| Date Deposited: | 16 Sep 2019 05:19 |
| Last Modified: | 16 Sep 2019 05:19 |
| URI: | http://repository.supsi.ch/id/eprint/11001 |
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