Ductile fracture of Mg–3Al–1Zn alloy under dynamic loads
The evaluation of the physical and mechanical properties of materials at high strain rates plays a key role in improving the accuracy of predicting the stress-strain state of structures operating under extreme conditions. This paper presents the results of a comprehensive experimental and numerical study of the mechanical response of thin-sheet rolled products of Mg-3Al-1Zn alloy (MA2-1) to dynamic punching and uniaxial tension. Magnesium alloy samples were exposed to uniaxial tension at rates ranging from 0.1 to 1000 s-1 and punching with a semispherical indenter at velocities of 10, 5, 1, and 0.1 m/s. A numerical simulation of the experimental conditions was carried out to estimate the resistance to high-speed plastic deformation under uniaxial and biaxial tension and to determine the stress distribution in the Mg-3Al-1Zn alloy plate under the specified loading conditions. To describe the deformation, damage, and fracture of Mg-3Al-1Zn alloy, the computational model was based on the model of the mechanical behavior of the alloy with a hexagonal close-packed (HCP) crystal lattice and the model of damage initiation and growth. The simulation results confirmed that the fracture of the magnesium alloy was ductile under high-speed biaxial tension. It was found that cracks were formed during biaxial tension under conditions of punching by a hemispherical indenter at velocities from 10 to 0.1 m/s at lower values of equivalent plastic strains than during uniaxial tension at similar strain rates. The crack shapes and plate deflections obtained in the calculations of dynamic punching of the Mg-3Al-1Zn alloy plates using the model of damaged HCP materials were consistent with those observed in the experiments.
Keywords
dynamic punching test,
uniaxial tension,
magnesium alloys,
high strain rates,
stress triaxialityAuthors
| Skripnyak Vladimir V. | Tomsk State University | skrp2012@yandex.ru |
| Skripnyak Nataliya V. | Tomsk State University | natali.skrp@mail.ru |
| Zagorodkin Oleg N. | Tomsk State University | still035@gmail.com |
| Skripnyak Vladimir A. | Tomsk State University | skrp2006@yandex.ru |
Всего: 4
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