Abstract
Constitutive behaviour of a high-strength nanostructured bainitic steel NANOS-BA® was investigated in the article. A few types of mechanical tests under varying strain rates were carried out to determine the values of constants of Johnson-Cook flow and fracture models for the analysed material. In quasi-static conditions (8×10-3 s-1) the material samples were subjected to uniaxial tension and compression tests. In a high strain rates conditions (2,7×103 s-1) the Taylor impact test was carried out. On the basis of the data obtained from mechanical tests the constitutive model of the NANOS-BA® steel was built. It was then validated to determine the extent and degree of compliance between the numerical and experimental observations. The examples of combined numerical-experimental analyses of protective structures containing investigated material were shown. Small differences between the both types of results testifies that determined constants of Johnson-Cook equation may properly reproduce actual behaviour of the material, and the numerical model allows the preliminary evaluation of the effectiveness of armours containing layers of analysed grade of steel.
Highlights
Designing of effective and light armours consisting of new materials and subsequent evaluation of their protective capability may be very expensive and timeconsuming when it is based only on experimental methods
The aim of the study presented in the article was building of the numerical model of a high-strength bainitic steel designed for armour applications
The primary objective of the work was to develop the accurate and reliable constitutive model of high-strength nanostructured NANOS-BA® steel which could be used to numerical evaluation the effectiveness of armours
Summary
Designing of effective and light armours consisting of new materials and subsequent evaluation of their protective capability may be very expensive and timeconsuming when it is based only on experimental methods (bulletproof tests). Numerical methods are often used in the armour designing process They allow to shorten the time and reduce the costs of the research, especially in the initial stage, where they help to identify the best variants of construction limiting the number of necessary experimental tests. As a result the steel is characterized by a high yield strength Re > 1,3 GPa, tensile strength Rm > 2,0 GPa and hardness HV10 > 640 with a reasonable level of ductility A5 > 12 %. Such combination of properties is desirable in the armour applications. Chemical composition and heat treatment parameters of NANOS-BA® steel were submitted to the Patent Office of the Republic of Poland [1]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
