Journal ArticleDOI
The dynamic effect of necking in Hopkinson bar tension tests
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TLDR
In this article, the effects of the necking on the strain rate and on the related material response are investigated, and it is also checked whether or not a material-independent function previously developed for correcting the post-necking true curves in quasi static tests, can also be used for correcting stress-strain curves from Hopkinson bar testing and transforming them into equivalent stress vs. equivalent strain curves at a given strain rate.About:
This article is published in Mechanics of Materials.The article was published on 2013-03-01. It has received 45 citations till now. The article focuses on the topics: Necking & Split-Hopkinson pressure bar.read more
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A method to investigate strain rate effects on necking and fracture behaviors of advanced high-strength steels using digital imaging strain analysis
TL;DR: In this paper, a strain analysis system is applied to quasi-static and dynamic tensile tests to measure the strain propagation with a digital camera or a high-speed video camera, and the effect of strain rate on the stress-strain relations and strain localization behavior is investigated for steel sheets with tensile strengths ranging from 270 MPa to 1470 MPa.
Journal ArticleDOI
Experimental issues in tensile Hopkinson bar testing and a model of dynamic hardening
TL;DR: In this article, the error levels achievable in the dynamic characterization of ductile metals via Hopkinson bar tensile tests, ran according to the classical strain-gauge-based experimental procedure and to the enhanced high-speed camera-assisted procedure, are evaluated.
Journal ArticleDOI
Analysis and modelling of tensile and torsional behaviour at different strain rates of Ti6Al4V alloy additive manufactured by electron beam melting (EBM)
TL;DR: In this paper, the tensile behavior of a Ti6Al4V alloy produced by Electron Beam Melting is investigated at static and dynamic rates together with the torsion response at static rates, in order to evaluate the effects of the strain rate and the Lode stress-state parameter on the elastoplastic response and the fracture initiation.
Journal ArticleDOI
Identification of Constitutive Model Parameters for Nimonic 80A Superalloy
TL;DR: In this paper, the material constitutive models of Nimonic 80A superalloy have been evaluated at room temperature at high strain rates (370 −954 −s−1) using the Split-Hopkinson pressure bar.
Journal ArticleDOI
The deterministic nature of the fracture location in the dynamic tensile testing of steel sheets
TL;DR: In this paper, the authors investigated the key mechanisms which determine the fracture location in the dynamic tensile testing of steel sheets for that purpose and conducted experiments and finite element simulations Experiments have been performed using samples with six different gauge lengths, ranging from 20mm to 140mm, that have been tested within a wide spectrum of loading velocities.
References
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Journal ArticleDOI
Microtubule nucleation by γ-tubulin complexes
TL;DR: The first crystallographic analysis of a non-γ-tubulin γTuRC component has resulted in a new appreciation of the relationships among all γ TuRC proteins, leading to a refined model of their organization and function.
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Determination of temperature rise during high strain rate deformation
R. Kapoor,Sia Nemat-Nasser +1 more
TL;DR: In this article, the energy converted to heat during high strain rate plastic deformation is measured directly using an infra-red method for Ta−2.5% W alloy and, indirectly, using UCSD's recovery Hopkinson bar technique for the same alloy, as well as for commercially pure Ti, 1018 steel, 6061 Al and OFHC Cu.
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A computational model of viscoplasticity and ductile damage for impact and penetration
TL;DR: A coupled constitutive model of viscoplasticity and ductile damage for penetration and impact related problems has been formulated and implemented in the explicit finite element code LS-DYNA.
Uniaxial True Stress-Strain after Necking
Yun Ling,Amp Incorporated +1 more
TL;DR: In this paper, a weighted average method for determining uniaxial, true tensile stress vs. strain relation after necking is presented for strip shaped samples for various alloys.