The effect of toughness on the failure of high and very high strength structural steels in the elasto-plastic and fully plastic range

Project Information

Grant agreement ID: 7210-KE-120

Project closed

Start date 1 July 1987

End date 30 June 1990

Funded under

• Medium-term guidelines (ECSC) "technical steel research", 1986-1990

Total cost

€ 585 500,00

EU contribution

€ 351 300,00

Coordinated by

Rheinisch-Westfälische Technische Hochschule Aachen (RWTH)
Germany

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Publications

Other (1)

Investigations into the influence of the toughness on the failure behaviour of high strength steels in the elastic-plastic and fully plastic range on the basis of wide plate tests

Author(s): LIESSEM A (Institut für Eisenhüttenkunde, Rheinisch-Westfälische Technische Hochschule, Aachen (DE)), DAHL W (Institut für Eisenhüttenkunde, Rheinisch-Westfälische Technische Hochschule, Aachen (DE))
Published in: EUR 13954 DE (1992) 149 pp., FS, ECU 13.75 (euroabstract 30/1114), 1992, Page(s) 149, ISBN 92-826-3689-5

Exploitable results

The failure behaviour of high strength steels

Within this research project 9 steels of varying strength and toughness have been investigated by different test procedures in order to examine differences in the failure behaviour of high strength steels. A major topic was the investigation concerning the influence of temperature on the deformation and failure behaviour of wide plates in the elastic plastic range and fully plastic range. It was shown that, with increasing strength, stable crack extension appears below the plastic collapse load. In addition, the influence of the amount of elastic energy which is available for the occurrence of fracture was investigated. It became clear that with decreasing stiffness the values of fracture strain declined visibly. Furthermore, safety concepts of fracture were examined with regard to their applicability to high strength steels. The statements about safety extend from gross estimations by the crack tip opening displacement (CTOD) design curve approach to exact predictions using finite element (FE) calculations.