Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures

Johnson, Gordon R.; Cook, William H.

doi:10.1016/0013-7944(85)90052-9

Cited by 5,165 publications

(2,145 citation statements)

References 8 publications

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“…To determine the deviatoric part of the stress tensor in Eq. (26), the purely empirical Johnson-Cook model by Johnson and Cook (1985) is used, which is numerically robust and therefore widely used for thermal elastic-plastic modeling, where the calculation of σ d is illustrated in Leroch et al (2016). The relation for the flow stress σ f is given as…”

Section: Materials Modelmentioning

confidence: 99%

“…In combination with visco-plastic constitutive material models, such as the one by Johnson and Cook (1985), this approach has been extensively used with the increasing availability of commercial FEM codes and computational power. However, as an alternative to both FEM and conventional meshless particle methods, a different approach is taken here, combining grid and particle behavior, the so-called Material Point Method (MPM).…”

Section: Introductionmentioning

confidence: 99%

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Development and validation of a meshless 3D material point method for simulating the micro-milling process

Leroch¹,

Eder²,

Ganzenmüller³

et al. 2018

Preprint

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A meshless Generalized Interpolation Material Point Method for simulating the micro-milling process was developed. This method has several advantages over well-established approaches (such as finite elements) when it comes to large plastic strains and deformations, since it inherently does not suffer from tensile instability problems. The feasibility of the developed material point model for simulating micro-milling is verified against finite element simulations and experimental data. The model is able to successfully predict experimentally measured cutting forces and determine chip temperatures in agreement with conventional finite element simulations. After having verified the approach, the model was applied to perform extensive numerical 3D simulations of the micro-milling process. The goal is to evaluate the response of the micromilling cutting forces as function of the hardening behavior of the micro-milled material. The meshless 3D simulations reveal a dependency of tool force slopes (with respect to the uncut chip thickness) on the hardening parameters. Based on these findings, a new approach is outlined to determine hardening parameters directly from two micro-milling experiments with distinct, sufficiently large uncut chip thicknesses.

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Section: Materials Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and validation of a meshless 3D material point method for simulating the micro-milling process

Leroch¹,

Eder²,

Ganzenmüller³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…However, common damage concepts [7] are only applicable to monotone loading scenarios. Hence, the EFFECTIVE DAMAGE CONCEPT [8] by OHATA and TOYODA which is applicable in case of ultra-low-cycle fatigue (ULCF) during earthquakes is highly relevant.…”

Section: Damage Mechanics Approachmentioning

confidence: 99%

Prediction of Ductile Damage in Case of Seismic Action Using Innovative Damage Mechanics

Schaffrath¹,

Hoffmeister²,

Bartsch³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…In order to estimate the stress and strain for a deposited particle and substrate, a Johnson-Cook (J-C) simulation (Ref [25][26][27] was performed. The J-C model is an empirically based representation of the flow stress defined as: where r is the flow stress, e p is the equivalent plastic strain, _ e p is the equivalent plastic strain-rate, T is the temperature, _ e p0 is the reference plastic strain-rate, T M is the melting temperature, T R is the reference temperature, n is the strainhardening exponent, and A, B, C, and m are constants.…”

Section: Fem Simulation For Deformation Behaviormentioning

confidence: 99%

Critical Deposition Condition of CoNiCrAlY Cold Spray Based on Particle Deformation Behavior

Ichikawa

Ogawa

2016

J Therm Spray Tech

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Previous research has demonstrated deposition of MCrAlY coating via the cold spray process; however, the deposition mechanism of cold spraying has not been clearly explained-only empirically described by impact velocity. The purpose of this study was to elucidate the critical deposit condition. Microscale experimental measurements of individual particle deposit dimensions were incorporated with numerical simulation to investigate particle deformation behavior. Dimensional parameters were determined from scanning electron microscopy analysis of focused ion beam-fabricated cross sections of deposited particles to describe the deposition threshold. From Johnson-Cook finite element method simulation results, there is a direct correlation between the dimensional parameters and the impact velocity. Therefore, the critical velocity can describe the deposition threshold. Moreover, the maximum equivalent plastic strain is also strongly dependent on the impact velocity. Thus, the threshold condition required for particle deposition can instead be represented by the equivalent plastic strain of the particle and substrate. For particle-substrate combinations of similar materials, the substrate is more difficult to deform. Thus, this study establishes that the dominant factor of particle deposition in the cold spray process is the maximum equivalent plastic strain of the substrate, which occurs during impact and deformation.

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Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures

Cited by 5,165 publications

References 8 publications

Development and validation of a meshless 3D material point method for simulating the micro-milling process

Development and validation of a meshless 3D material point method for simulating the micro-milling process

Prediction of Ductile Damage in Case of Seismic Action Using Innovative Damage Mechanics

Critical Deposition Condition of CoNiCrAlY Cold Spray Based on Particle Deformation Behavior

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