Studying the Localized Shear Fracture Mechanism in Alloys under Dynamic Loading

被引:1
作者
Sokovikov, M. A. [1 ]
Chudinov, V. V. [1 ]
Oborin, V. A. [1 ]
Uvarov, S. V. [1 ]
Naimark, O. B. [1 ]
机构
[1] Russian Acad Sci, Inst Continuous Media Mech, Ural Branch, Perm 614013, Russia
基金
俄罗斯基础研究基金会;
关键词
plastic shear localization; dynamic loading; numerical simulation; defect structure evolution; study of the surface relief of deformed specimens;
D O I
10.1134/S0021894420070147
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Experiments on the dynamic loading of specimens from AMg6 alloy were conducted on a split Hopkinson-Kolsky bar and with target perforation. The thermodynamics of the deformation process was studied in situ by recording temperature fields using a CEDIP Silver 450M high-speed infrared camera in order to reveal the characteristic stages of strain localization. The temperature measurements in the localization zones do not confirm the traditional concept of the strain localization mechanism caused by thermoplastic instability. Dynamic tests of specimens made of Steel 3, AMg6, and D16 alloys of a special shape designed to study the localization of plastic deformation on a split Hopkinson-Kolsky bar were conducted using the StrainMaster noninvasive strain measurement system. The displacements and strain fields in these specimens are constructed. A comparison of the experimentally measured temperature and strain fields with the results of numerical simulation with allowance for the mesodefect accumulation kinetics in the material gives a satisfactory agreement within similar to 20%. In the specimens after the experiments, the surface relief was analyzed using a NewView-5010 optical surface profiler with subsequent processing of the 3D strain relief data and calculation of the scale invariant (Hurst index) and the spatial scale of the region on which the correlated behavior of mesodefects is observed. The data of the experiments and analysis of the surface relief of deformed specimens, as well as the data of numerical simulation taking the mesodefects accumulation kinetics in the material into account, suggest that one of the plastic strain localization mechanisms under high-speed loading is caused by jump-wise processes in the defect structure of materials.
引用
收藏
页码:1182 / 1193
页数:12
相关论文
共 41 条
[1]  
[Anonymous], 2003, Phys. Mesomech., DOI DOI 10.1134/S1029959917010076
[2]   A dislocation-based constitutive model for viscoplastic deformation of fcc metals at very high strain rates [J].
Austin, Ryan A. ;
McDowell, David L. .
INTERNATIONAL JOURNAL OF PLASTICITY, 2011, 27 (01) :1-24
[3]   THERMO-PLASTIC INSTABILITY IN SIMPLE SHEAR [J].
BAI, YL .
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1982, 30 (04) :195-207
[4]   Effect of viscoplastic relations on the instability strain, shear band initiation strain, the strain corresponding to the minimum shear band spacing, and the band width in a thermoviscoplastic material [J].
Batra, RC ;
Chen, L .
INTERNATIONAL JOURNAL OF PLASTICITY, 2001, 17 (11) :1465-1489
[5]   Numerical Simulation and Experimental Study of Plastic Strain Localization under the Dynamic Loading of Specimens in Conditions Close to a Pure Shear [J].
Bilalov, D. A. ;
Sokovikov, M. A. ;
Chudinov, V. V. ;
Oborin, V. A. ;
Bayandin, Yu. V. ;
Terekhina, A. I. ;
Naimark, O. B. .
JOURNAL OF APPLIED MECHANICS AND TECHNICAL PHYSICS, 2018, 59 (07) :1179-1188
[6]  
Bilalov D. A., 2018, Computational Continuum Mechanics, V11, P323, DOI 10.7242/1999-6691/2018.11.3.24
[7]  
[Билалов Д.А. Bilalov D.A.], 2017, [Деформация и разрушение материалов, Deformatsiya i razrushenie materialov], P43
[8]   Scaling properties of cracks [J].
Bouchaud, E .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1997, 9 (21) :4319-4344
[9]   An experimental and numerical study of the localization behavior of tantalum and stainless steel [J].
Bronkhorst, CA ;
Cerreta, EK ;
Xue, Q ;
Maudlin, PJ ;
Mason, TA ;
Gray, GT .
INTERNATIONAL JOURNAL OF PLASTICITY, 2006, 22 (07) :1304-1335
[10]   The influence of microstructure on the mechanical response of copper in shear [J].
Cerreta, E. K. ;
Frank, I. J. ;
Gray, G. T., III ;
Trujillo, C. P. ;
Korzekwa, D. A. ;
Dougherty, L. M. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2009, 501 (1-2) :207-219