PSI - Issue 47

Ezio Cadoni et al. / Procedia Structural Integrity 47 (2023) 268–273

273

6

Author name / Structural Integrity Procedia 00 (2023) 000–000

a)

b)

Fig. 6. Failure surfaces @20 ◦ C (a) and 1100°C (b).

were used to modify the triaxial stress state in the cross-sections in order to examine the triaxiality e ff ects. As the strain rate increases, tensile strength, modulus of toughness, and area reduction increase, as well. In the case of the examined Tungsten alloy, it was found that tensile properties such as ultimate tensile strength, fracture strength, and nominal total elongation significantly depend on the test temperature and decrease with increasing temperature. Stress triaxiality significantly a ff ects failure strain. The combined e ff ects of stress triaxiality, strain-rate sensitivity and tem perature on this alloy were investigated and failure surfaces were obtained including the experimental test data and the extrapolated data. The failure surface has been interpolated by means of the Johnson Cook damage constitutive model.

Acknowledgements

The authors would like to express their sincere gratitude to Dr. A. Koch and Dr. R. Lorenzo for fruitful discussions and Federal Department of Defence, Civil Protection and Sport —armasuisse Science and Technology — of the Swiss Confederation for supporting the experiments.

References

Cadoni, E., Dotta, M., Forni, D., Tesio, N., 2015. High strain rate behaviour in tension of steel B500A reinforcing bar, Materials and Structures 48(6), 1803-1813. Cadoni, E., Forni, D., 2015. Strain rate e ff ects on reinforcing steels in tension, EPJ WoC 94, 01004. Cadoni, E., Forni, D., 2019. Austenitic Stainless Steel Under Extreme Combined Conditions of Loading and Temperature, Journal of Dynamic Behavior of Materials 5(3), 230-240. Cadoni, E., Briccola, D., Dotta, M. and Forni, D. 2022, Combined e ff ect of elevated temperature and high strain rates on S690QL high strength steel, J. Constructional Steel Research 199, 107519. Cadoni, E., Dotta, M. and Forni, D. 2020, High strain-rate behaviour of a Tungsten alloy, Procedia Structural Integrity 28, 964 - 970. Cadoni, E., Dotta, M. and Forni, D. 2021, E ff ects of elevated temperature on a tungsten alloy at high strain-rate, EPJ WoC 250, 05004. Cadoni, E. and Forni, D. 2019, Mechanical behaviour of a very-high strength steel (S960QL) under extreme conditions of high strain rates and elevated temperatures, Fire Safety Journal, 102869. Cadoni, E. and Forni, D. 2021, Mechanical behaviour of B500A rebars: e ff ect of elevated temperature and high strain-rate, Fire Safety Journal, 103321. Bridgman, P.W. 1964, Studies in Large Plastic Flow and Fracture: With Special Emphasis on the E ff ects of Hydrostatic Pressure; Harvard University Press: Cambridge, MA, USA.