Modeling spontaneous shear bands evolution in thick-walled cylinders subjected to external High-strain-rate loading

Liu, Mingtao; Guo, Zhaoliang; Fan, Cheng; Tang, Tiegang; Xiao-yan, Wang; Hu, Haibo

doi:10.1016/j.ijsolstr.2016.07.014

Cited by 19 publications

(6 citation statements)

References 62 publications

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“…A possible explanation for these results was sought on the predictions of a linear stability analysis, which brought out that with the increase of the strain rate the dominant necking modes have a strong prevalence over the other growing modes, reducing the scatter in the distribution of neck sizes. Other authors who performed numerical calculations to investigate the influence of material defects on multiple localization and fragmentation problems are Hiroe et al (2008), Zhang and Ravi-Chandar (2010), Liu et al (2013Liu et al ( , 2016 and Cliche and Ravi-Chandar (2018). In these works, as in those mentioned above, material defects are included by allocating a reduced elastic limit to an arbitrary number of material points, or by assuming local variations in the failure strain.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis to determine the role of porosity in dynamic localization and fragmentation: Application to porous microstructures obtained from additively manufactured materials

Marvi-Mashhadi

Vaz-Romero

Sket

et al. 2021

International Journal of Plasticity

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In this paper, we have performed a microstructurally-informed finite element analysis on the effect of porosity on the formation of multiple necks and fragments in ductile thin rings subjected to dynamic expansion. For that purpose, we have characterized by X-ray tomography the porous microstructure of 4 different additively manufactured materials (aluminium alloy AlSi 10 Mg, stainless steel 316L, titanium alloy Ti 6 Al 4 V and Inconel 718L) with initial void volume fractions ranging from ≈ 0.0007% to ≈ 2%, and pore sizes varying between ≈ 6 µm and ≈ 110 µm. Three-dimensional analysis of the tomograms has revealed that the voids generally have nearly spherical shape and quite homogeneous spatial distribution in the bulk of the four materials tested. The pore size distributions quantified from the tomograms have been characterized using a Log-normal statistical function, which has been used in conjunction with a Force Biased Algorithm that replicates the experimentally observed random spatial distribution of the voids, to generate ring expansion finite element models in ABAQUS/Explicit (2016) which include actual porous microstructures representative of the materials tested. We have modeled the materials behavior using von Mises plasticity, and we have carried out finite element calculations for both elastic perfectly-plastic materials, and materials which show strain hardening, strain rate hardening and temperature softening effects. Moreover, we have assumed that fracture occurs when a critical value of effective plastic strain is reached. The finite element calculations have been performed for expansion velocities ranging from 50 m/s to 500 m/s. A key point of this investigation is that we have established individualized correlations between the main features of the porous microstructure (i.e. initial void volume fraction, average void size and maximum void size) and the number of necks and fragments formed in the calculations. In addition, we have brought out the effect of the porous microstrucure and inertia on the distributions of neck and fragment sizes. To the authors' knowledge, this is the first paper ever considering actual porous microstructures to investigate the role of material defects in multiple localization and dynamic fragmentation of ductile metallic materials.

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Section: Introductionmentioning

confidence: 99%

Finite element analysis to determine the role of porosity in dynamic localization and fragmentation: Application to porous microstructures obtained from additively manufactured materials

Marvi-Mashhadi

Vaz-Romero

Sket

et al. 2021

International Journal of Plasticity

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“…ASBs的形成和材料强度演变之间关系的关键点在于剪切局部化的临界条件 [12] . Liu等人 [15] 通过观察厚壁圆筒中多个剪切带组织, 建立了模拟自发剪切带行为的模型, 并通过微观实验观察到常见的剪切带形态特征. Yan等人 [16] 发现铝合金塑性变形的主要机制是压缩时位错形态从位错胞和位错带转变为绝热剪切带中的亚晶粒, 及拉伸时空穴体积分数的增加.…”

Section: 率相关行为该理论已成功地用于描述各种Bcc单晶unclassified

Dynamic mechanical response and a constitutive model of 42CrMo steel that incorporates the effects of high strain rates

Zhu

Zhang

2021

Sci. Sin.-Tech.

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“…This section presents the 3D finite element model developed in ABAQUS/Explicit (2016) to investigate multiple shear banding in thick-walled cylinders subjected to rapid radial collapse. While this problem is customarily simulated using a 2D approach (Areias and Belytschko, 2007;Lovinger et al, 2011;Liu et al, 2016;Wang et al, 2020), in this paper we have developed a 3D version of the numerical model employed by Lovinger et al (2018) -which is based on the experimental setup of Lovinger et al (2015)-in order to consider explicitly the porous microstructure of the specimen. The finite element model consists of three sandwiched cylinders: an inner copper cylinder (inner diameter 3.25 mm, outer diameter 3.5 mm), the specimen of the tested material (inner diameter 3.5 mm, outer diameter 5.0 mm) and an outer copper cylinder (inner diameter 5.0 mm, outer diameter 5.5 mm).…”

Section: Finite Element Modelmentioning

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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Modeling spontaneous shear bands evolution in thick-walled cylinders subjected to external High-strain-rate loading

Cited by 19 publications

References 62 publications

Finite element analysis to determine the role of porosity in dynamic localization and fragmentation: Application to porous microstructures obtained from additively manufactured materials

Finite element analysis to determine the role of porosity in dynamic localization and fragmentation: Application to porous microstructures obtained from additively manufactured materials

Dynamic mechanical response and a constitutive model of 42CrMo steel that incorporates the effects of high strain rates

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

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