Modelling of thermo-viscoplastic behaviour of DH-36 and Weldox 460-E structural steels at wide ranges of strain rates and temperatures, comparison of constitutive relations for impact problems

Abstract

a b s t r a c tIn this paper, the thermo viscoplastic behaviour of DH 36 and Weldox 460 E steels is ana lyzed at wide ranges of strain rates and temperatures. These materials are commonly used for naval applications. Thus, they may be subjected to a wide range of exploitation temper atures and at the same time to high strain rates due to accidental impact or explosion. The thermo viscoplastic behaviour of these materials has been modeled by application of RK , and 77 K to about 1000 K). Especially for high strain rate level, the predictions of RK model are notably more precise than those predic tions obtained using PB and JC models. This proof converts RK model in suitable for mod eling impact problems. Finally, numerical simulations of perforation process of DH 36 and Weldox 460 E steel plates impacted by conical non deformable projectiles have been car ried out using RK and JC models. Numerical results using FE simulations have revealed sub stantial influence of the constitutive relation concerning the ballistic limit, residual velocity and failure time predictions for the same initial and boundary conditions.

A thermo-viscoplastic constitutive model for FCC metals with application to OFHC copper

“…The constancy of the strain hardening exponents n i in the formulation is contrary to observations frequently made and reported for metals in many publications, for example [28,29,51]. This fact may raise considerable relevance, especially in dynamic events suscep tible for plastic instabilities [18,28,56].…”

Effect of projectile nose shape on ballistic resistance of interstitial-free steel sheets

“…Subsequently a straightforward method was proposed by Rusinek and Klepaczko [1,23] for the model calibration. It allows defining the model parameters step by step.…”

“…Contrary to other constitutive descriptions, the procedure does not involve a global fitting. It must be noticed that the constants are defined using physical assumptions [1,23].…”

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

“…Over the last decades, the theoretical treatment of the constitutive behavior of metals has raised the interest of the most relevant researchers in the framework of contin uum mechanics (Austin and McDowell, 2011;Campbell, 1973;Campbell and Ferguson, 1970;Conrad, 1961;Klepaczko, 1975;Klepaczko et al, 2009;Molinari and Ravichandran, 2005;Seeger, 1957;Zaera et al, 2002;Zerilli and Armstrong, 1987). The pioneer works of Taylor (1938) and Orowan (1948) among others established the defor mation behavior of metals in terms of theory of disloca tions.…”