Effects of Temperature and Strain Rate on the Ductility of an API X65 Grade Steel

In the last few decades, great effort has been spent on advanced material testing and development of damage models intended to estimate ductility fracture ductile metals. While most studies focused static are applied at room temperatures only, in this paper, multiaxial tests have executed investigate effects dynamic action temperature mechanical behavior an API X65 steel. To end, a Split Hopkinson Bar (SHB) facility for tests, uniaxial machine equipped with high-temperature furnace, were used. Numerical simulations experiments setup calibration validation purposes. Based experimental results, Johnson–Cook Zerilli–Armstrong plasticity first tuned, resulting good experimental–numerical match. Secondly, triaxiality Lode angle dependent proposed by Bai–Wierzbicki Coppola–Cortese also calibrated. The comparison surfaces predicted under different loading conditions showed, as expected, overall significant increase temperature; appreciable was observed strain rate, range low moderate triaxialities.