Strain rate dependent plasticity and fracture of DP1000 steel under proportional and non-proportional loading
نویسندگان
چکیده
To assess the effect of stress state and strain rate on damage fracture a commercial DP1000 steel with very fine microstructure, an extensive series tests were performed. Using finite element simulations, eight different sample geometries, including dogbone, central hole, shear several notched samples, designed to achieve both proportional non-proportional states using conventional test benches. Tested at quasi-static, intermediate and, dynamic deformation rates, in total 175 Local fields obtained by digital image correlation. A correction procedure was worked out eliminate influence thermal softening. After testing, scanning electron microscopy employed analyse surfaces. Tests fractography allowed draw systematic conclusions response steel. two-stage sensitivity strength is found gradually increasing slope low rates much steeper rise high which further amplified higher triaxiality states. The experimentally derived loci revealed dominant, detrimental impact that most pronounced rates. remarkable, non-monotonic evolution observed: highest values Scanning images surfaces indicate void-assisted ductile fracture, though occurrence brittle features triggered Fracture morphology dimple are heavily dependent state, loading path.
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ژورنال
عنوان ژورنال: European Journal of Mechanics A-solids
سال: 2022
ISSN: ['1873-7285', '0997-7538']
DOI: https://doi.org/10.1016/j.euromechsol.2021.104446