Strain Correlation at Different Structural Levels for Dynamically Loaded Hollow Copper Cylinders

Bondar, M. P.; Nesterenko, V. F.

doi:10.1051/jp4:1991321

Cited by 6 publications

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“…The experimental procedures were originally developed for metals but were modified for granular and brittle materials. 12,[20][21][22][23][24] This method consists of two explosive events: the first event to fracture the ceramic and the second event to deform the fragmented ceramic.…”

Section: B High-strain-rate Experimentsmentioning

confidence: 99%

High-strain-rate deformation and comminution of silicon carbide

Shih

Nesterenko

Meyers

1998

Journal of Applied Physics

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Articles you may be interested inOn electronic structure of polymer-derived amorphous silicon carbide ceramics Appl. Phys. Lett. Material strength and inelastic deformation of silicon carbide under shock wave compressionGranular flow of comminuted ceramics governs the resistance for penetration of ceramic armor under impact. To understand the mechanism of the granular flow, silicon carbide was subjected to high-strain, high-strain-rate deformation by radial symmetric collapse of a thick-walled cylinder by explosive. The deformation, under compressive stresses, was carried out in two stages: the first stage prefractured the ceramic, while a large deformation was accomplished in the second stage. The total tangential strain (Ϫ0.23) was accommodated by both homogeneous deformation (Ϫ0.10) and shear localization (Ϫ0.13). Three microstructures, produced by different processing methods, were investigated. The microstructural differences affected the microcrack propagation: either intergranular or transgranular fracture was observed, depending on the processing conditions. Nevertheless, the spacing between shear bands and the shear displacement within the shear bands were not significantly affected by the microstructure. Within the shear bands, the phenomenon of comminution occurred, and the thickness of the shear bands increased gradually with the shear strain. A bimodal distribution of fragments developed inside the shear bands. The comminution proceeded through the incorporation of fragments from the shear-band interfaces and the erosion of fragments inside the shear band. Outside the shear bands, an additional comminution mechanism was identified: localized bending generated comminution fronts, which transformed the fractured material into the comminuted material. The observed features of high-strain-rate deformation of comminuted SiC can be used for validation of computer models for penetration process.

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Section: B High-strain-rate Experimentsmentioning

confidence: 99%

High-strain-rate deformation and comminution of silicon carbide

Shih

Nesterenko

Meyers

1998

Journal of Applied Physics

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“…In a recent paper, an experimental technique, called the 'thick-walled cylinder (TWC) method', has been used by Nesterenko et al [1] and Bondar and Nesterenko [2] to study strain localization at high strain rates. The strain rate in the TWC method can be much higher than the strain rate that can be achieved by conventional methods, such as the Hopkinson bar technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental observation and computational simulation of dynamic void collapse in single crystal cooper

Nemat‐Nasser

Okinaka

Nesterenko

1998

Materials Science and Engineering: A

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Hollow circular cylinders of single crystal copper are subjected to externally applied explosive loads that cause the collapse of the cylinder. Then numerical simulations are performed to understand the deformation process that leads to localized deformation and tensile cracking, observed in partially collapsed cylinders of fcc single crystals. The results of experiments and numerical simulations are in good agreement.

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“…The collapsing thick-walled cylinder technique was shown to produce controlled and repeatable helical shear band patterns, which allowed to investigate -for the first time-the collective behavior and spacing of shear bands at strain rates of ≈ 10 4 s −1 . Experiments performed with Copper, AISI 304L, pure Titanium, Ti6Al4V and Tantalum specimens provided indications of the actual sensitivity of these materials to shear banding, and revealed that the critical strain leading to shear bands formation and the average separation between shear bands varies from material to material (Bondar and Nesterenko, 1991;Nesterenko and Bondar, 1994;Nesterenko et al, 1995Nesterenko et al, , 1997Nesterenko et al, , 1998Xue et al, 2002Xue et al, , 2004. Similar conclusions were obtained from the recent experiments performed by Yang et al (2011), Yang andJiang (2016) and Yang et al (2017) with different tempers of Ti-1300 titanium alloy and ZK60 magnesium alloy, which showed that the distribution, width, and spacing of the adiabatic shear bands varies with the heat treatment applied to the specimen before testing.…”

Section: Introductionmentioning

confidence: 99%

New insights into the role of porous microstructure on adiabatic shear localization

Vishnu¹,

Marvi-Mashhadi²,

Nieto-Fuentes³

et al. 2021

Preprint

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This paper provides new insights into the role of porous microstructure on adiabatic shear localization. For that purpose, we have performed 3D finite element calculations of electro-magnetically collapsing thick-walled cylinders. The geometry and dimensions of the cylindrical specimens are taken from the experiments of Lovinger et al. (2015), and the loading and boundary conditions from the 2D simulations performed by Lovinger et al. (2018). The mechanical behavior of the material is modeled as elastic-plastic, with yielding described by the von Mises criterion, an associated flow rule and isotropic hardening/softening, being the flow stress dependent on strain, strain rate and temperature. Moreover, plastic deformation is considered to be the only source of heat, and the analysis accounts for the thermal conductivity of the material. The distinctive feature of this work is that we have followed the methodology developed by Marvi-Mashhadi et al. (2021) to incorporate into the finite element calculations the actual porous microstructure of 4 different additively manufactured materials --aluminium alloy AlSi10Mg, stainless steel 316L, titanium alloy Ti6Al4V and Inconel 718-- for which the initial void volume fraction varies between 0.001% and 2%, and the pores size ranges from ≈ 6 µm to ≈ 110 µm. The numerical simulations have been performed using the Coupled Eulerian-Lagrangian approach available in ABAQUS/Explicit (2016) which allows to capture the shape evolution, coalescence and collapse of the voids at large strains. To the authors' knowledge, this paper contains the first finite element simulations with explicit representation of the material porosity which demonstrate that voids promote dynamic shear localization, acting as preferential sites for the nucleation of the shear bands, speeding up their development, and tailoring their direction of propagation. In addition, the numerical calculations bring out that for a given void volume fraction more shear bands are nucleated as the number of voids increases, while the shear bands are incepted earlier and develop faster as the size of the pores increases.

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Strain Correlation at Different Structural Levels for Dynamically Loaded Hollow Copper Cylinders

Cited by 6 publications

References 0 publications

High-strain-rate deformation and comminution of silicon carbide

High-strain-rate deformation and comminution of silicon carbide

Experimental observation and computational simulation of dynamic void collapse in single crystal cooper

New insights into the role of porous microstructure on adiabatic shear localization

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