A Revised Form for the Johnson–cook Strength Model

Rule, William K.; Jones, Suzi

doi:10.1016/s0734-743x(97)00081-x

Cited by 131 publications

(62 citation statements)

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“…In such cases, the improve its impact at high strain rates by substituting it with a simple power law. Rule and Jones [12] modified this term to better describe the rapid increase of the stress around 10 3 s − 1 in the case of copper and aluminum samples. Finally, a quadratic formulation was added to this term by Woo Jong Kang [13] to enhance the strain rate sensitivity effect for various sheet steels.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting

Harzallah

Pottier

Senatore

et al. 2017

International Journal of Mechanical Sciences

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a b s t r a c tThe chip formation mechanism of the Ti-6Al-4V remains a challenging problem in the machining process as well as its modeling and simulation. Starting from experimental observation on the titanium alloys Ti-6Al-4V machining shows that the ductile fracture in the chip formation is dominated by the shear phenomenon under high strain rate and temperature, the present work develops a new coupled behavior and damage model for better representation and understanding of the chip formation process. The behavior and damage of Ti-6Al-4V have been studied via hat-shaped specimen under temperature up to 900 °C and strain rate up to 1000 s − 1 . An inverse identification method based on Finite Element (FE) is established in order to determine the constitutive law's parameters. The prediction of the segmented chip was analyzed through 3D finite element orthogonal cutting model which was validated by an in-situ and post-mortem orthogonal cutting machining observations. Finally, a particular attention is focused on the chip formation genesis which is described by three steps: Growth, Germination and Extraction.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting

Harzallah

Pottier

Senatore

et al. 2017

International Journal of Mechanical Sciences

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“…We have repeated spallation simulations using either of the three dynamic strength models: SteinbergGuinan (SG) [5], Zerilli-Armstrong (ZA) [6], Revised Johnson-Cook (RJC) [7]. Figure 4 shows the experimental and computed free-surface velocity profiles of the spalled element in a Cu target, for the parameters of the experiment labelled B-62 [4].…”

Section: Comparison Of Strength Modelsmentioning

confidence: 99%

Simulation of impact/explosive driven spallation in metals: comparative study of damage and dynamic strength models

Ikkurthi

Chaturvedi

2012

J. Phys.: Conf. Ser.

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Abstract. Spallation refers to fracture occurring in materials due to tensile loading. This paper presents an overview of our extensive one-and two-dimensional simulations done to study spallation in impact/explosive loaded Copper or Mild Steel targets, using an ArbitraryLagrangian-Eulerian hydrocode. Three methods of computing the spall strength and spall thickness have been employed. The computed spall parameters have been compared with Russian spall experiments. In impact loaded targets, due to a square shock wave, only one scab has been observed. In the case of explosive loading, as the rarefaction associated with the incoming shock wave is triangular, there occur many high-tension regions leading to the formation of multiple scabs (typically 2-3 scabs). Effect of flier velocity and target temperature on spallation has been studied. These trends match with experiments. Edge effects due to finite diameter of the target attenuate the incoming shock wave by lateral release, resulting in more marked damage near the axis than on the periphery. Four damage models and three dynamic strength models have been examined to determine the best-suited model for spallation studies. It is found that the Void Growth (VG) damage model and Zerilli-Armstrong strength model yield spall parameters close to experiments.

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“…For the tubes, we use the Johnson-Cook material model that is already provided by the LS-DYNA, using material parameters that have been experimentally established by Rule and Jones [1998] for 7075 aluminum. In this model the flow stress τ is expressed as…”

Section: Materials Modelsmentioning

confidence: 99%

Experimental and computational evaluation of compressive response of single and hex-arrayed aluminum tubes

Nemat‐Nasser

Amini

Choi

et al. 2007

JOMMS

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We report experiments and simulations of the dynamic and quasistatic compressive response of single and hex-arrayed thick aluminum tubes. The investigation aims to further characterize how tube-based sandwich structures absorb energy. First, we study by compression tests the quasistatic buckling of single tubes of 7075 aluminum, an alloy showing sufficient ductility and plasticity to make it potentially a good choice for energy absorbing devices. The experiments show geometry-dependent buckling modes. The corresponding finite element numerical simulations correlate well and will help estimate the maximum load level, and the buckling and postbuckling responses. Second, we study the dynamic buckling of sandwiched, hex-arrayed 3003 aluminum tubes. The simulations and experimental results correlate well and show a remarkable increase in energy absorbing capacity, which is caused by the postbuckling interaction of neighboring tubes. They also show that, as the tube spacing is decreased, the overall energy absorbed increases significantly. We also simulate how varying tube length and thickness affect the buckling of the array under dynamic loading.

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A Revised Form for the Johnson–cook Strength Model

Cited by 131 publications

References 0 publications

Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting

Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting

Simulation of impact/explosive driven spallation in metals: comparative study of damage and dynamic strength models

Experimental and computational evaluation of compressive response of single and hex-arrayed aluminum tubes

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