Strain rate effects on reinforcing steels in tension

Cadoni, Ezio; Forni, Daniele

doi:10.1051/epjconf/20159401004

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…Not only does this value strongly influence the DIF curve, but it is also needed to use the model in the future. When it is not included, such as in Cadoni and Forni (2015), it renders the reported c value unusable for future modeling.…”

Section: Methodsmentioning

confidence: 99%

Influence of elevated strain rate on the mechanical properties of hollow structural sections

Ritchie

Gow²,

Packer

et al. 2017

International Journal of Protective Structures

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As protective design engineering becomes more prevalent, cold-formed steel hollow structural sections are often desired design components. As such, it is necessary to understand the behavior of hollow structural sections subject to air-blast loading, including the material response under elevated strain rates. Dynamic tensile tests have hence been performed on subsize tensile coupons taken from the flats and corners of cold-formed rectangular hollow section members. Dynamic yield stresses were obtained at strain rates from 0.1 to 18 s −1 , which encompasses and exceeds the range recorded during far-field blast arena testing. The dynamic increase factor was calculated for each data point and synthesized with previous cold-formed rectangular hollow section tests at even higher strain rates (100-1000 s −1). The data set was used to determine Cowper-Symonds and Johnson-Cook parameters. The resulting material models can now be used to determine the strength increase of cold-formed rectangular hollow sections subject to a wide range of impulsive, elevated strain rate loads.

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Section: Methodsmentioning

confidence: 99%

Influence of elevated strain rate on the mechanical properties of hollow structural sections

Ritchie

Gow²,

Packer

et al. 2017

International Journal of Protective Structures

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“…The UHPC studied in this first application was the matrix of a commercial UHPFRC product [7]. It was a cementitious composite obtained mixing cement, water, quartz sand, micro-silica, and super plasticizers.…”

Section: Methodsmentioning

confidence: 99%

First application of the 3D-MHB on dynamic compressive behavior of UHPC

Cadoni

Dotta

Forni

et al. 2015

EPJ Web of Conferences

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Abstract. In order to study the dynamic behaviour of material in confined conditions a new machine was conceived and called 3D-Modified Hopkinson Bar (3D-MHB). It is a Modified Hopkinson Bar apparatus designed to apply dynamic loading in materials having a tri-axial stress state. It consists of a pulse generator system (with pre-tensioned bar and brittle joint), 1 input bar, and 5 output bars. The first results obtained on Ultra High Performance Concrete in compression with three different mono-axial compression states are presented. The results show how the pre-stress states minimize the boundary condition and a more uniform response is obtained.

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“…Для снижения импульсных и вибрационных нагрузок в конструкциях применяют пористые элементы в виде гранулированных слоев, проволочных решеток, экранов, сеток, перфорированных перегородок [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. В частности, для защиты силовых корпусов взрывных камер от осколочного повреждения в настоящее время применяются многослойные металлические сетки тканого плетения [20,21].…”

Section: Introductionunclassified

Numerical modeling of nonlinear dynamic and static compression of the metal mesh

Kochetkov

Modin

Leont’ev

et al. 2019

PNRPU Mechanics Bulletin

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Simulation of elastoplastic compression of a symmetric fragment of a bundle of woven steel grids was carried out. The simulation was carried out under static and dynamic loading modes in ANSYS and ANSYS LS-DYNA computing systems. A porous mesh package is formed by overlaying the layers on top of each other while maintaining the directions of wires. Such a packet has a quasiperiodic structure; therefore, a certain symmetric fragment can be distinguished. The compression was carried out by a pair of absolutely rigid plates moving symmetrically towards each other. In the calculations, a multilinear plasticity model with isotropic hardening was used. The diagram of static deformation of the material was used which was obtained experimentally. The calculations were carried out according to the algorithm of a perfect symmetric contact of bodies without friction and with friction. The dynamic loading of a fragment of the mesh packet was carried out at a constant speed. The characteristics of the pulse and the loading rate correspond to those observed in previous experimental studies. The dynamic strain diagram was assumed to be similar to a static one with an increased yield strength. Calculations showed that in all loading modes there is a high level of internal stresses, and complex inhomogeneous stress-strain state. We investigated two factors that could cause differences in the behavior of the curves of deformation of a porous medium - the finite length of the acting pulse and the differences in the dynamic and static compression diagrams of the initial mesh material. The main influence on the dynamic behavior of a fragment of a porous packet of a steel mesh is exerted by the dynamic properties of the wire material. The strain curves of the porous fragment qualitatively change in accordance with the behavior observed in static and dynamic experiments. The final duration of the loading pulse and the friction between the wires for this type of mesh do not have a significant effect. The numerical dependences of the relative area of the normal and lateral through sections of the symmetric fragment of the grid packet on the compression deformation are obtained.

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Strain rate effects on reinforcing steels in tension

Cited by 23 publications

References 14 publications

Influence of elevated strain rate on the mechanical properties of hollow structural sections

Influence of elevated strain rate on the mechanical properties of hollow structural sections

First application of the 3D-MHB on dynamic compressive behavior of UHPC

Numerical modeling of nonlinear dynamic and static compression of the metal mesh

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