A physically based model for dynamic failure in ductile metals

Campagne, L.; Daridon, Loïc; Ahzi, Saı̈d

doi:10.1016/j.mechmat.2004.06.006

Cited by 27 publications

(10 citation statements)

References 19 publications

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“…Therefore the void coalescence process can be neglected. In the present work, we briefly address the constitutive equations for damage criterion since the details can be found in [2]. The material porosity f is determined from the total relative void volume V T and given by:…”

Section: Nucleation and Growth Modelmentioning

confidence: 99%

“…The damage evolution in ductile metals begins after a threshold strain [11,12] associated in our case to threshold porosityf t . The effective porosity f * is defined by the following relation [2]:…”

Section: Nucleation and Growth Modelmentioning

confidence: 99%

“…This leads to the development of several engineering models using modern numerical methods to predict failure of different materials at different loading rates and temperatures. A review of these dynamic failure criteria and their extension to include temperature and pressure effects is given in the work of Hanim and Ahzi [1] and Campagne et al [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A physically-based and fully coupled model of elasto-plasticity and damage for dynamic failure in ductile metals

Oussouaddi¹,

Campagne²,

Daridon

et al. 2006

J. Phys. IV France

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Section: Nucleation and Growth Modelmentioning

confidence: 99%

Section: Nucleation and Growth Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A physically-based and fully coupled model of elasto-plasticity and damage for dynamic failure in ductile metals

Oussouaddi¹,

Campagne²,

Daridon

et al. 2006

J. Phys. IV France

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“…Additionally, this type of modeling is suitable for description of so called strain rate and temper ature history effects (structure dependent) (Klepaczko, 1975;Klepaczko and Rezaig, 1996;Tanimura and Duffy, 1986). Moreover it has to be remarked that this type of constitutive description is required to understand dynamic failure mechanics which are often dislocation controlled (Campagne et al, 2005). The relationship between struc tural evolution and failure mechanisms has been recently explored in relevant publications by Rittel and co workers (Dolinski et al, 2010;Rittel et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

Rodríguez-Martínez

Rodríguez-Millán

Rusinek

et al. 2011

Mechanics of Materials

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a b s t r a c tIn this work a dislocation based constitutive description for modeling the thermo visco plastic behavior of FCC metals has been developed. The constitutive description, which is founded on the concepts of thermal activation analysis and dislocation dynamics, assumes the plastic flow additively decomposed into internal stress and effective stress. The internal stress represents the applied stress required for the transmission of plastic flow between the polycrystal grains and it is defined by the Hall Petch relationship. The effective stress formulation, which is the main innovative feature of this work, represents the thermally activated deformation behavior. This is defined taking into account the interrelationship between strain rate and temperature, and gathers structural evolution dependence. This structural evolution is described as a function of dislocations density, which acts as internal state variable in the material deformation behavior. A systematic procedure for identifica tion of the material parameters is developed and the model is applied to define the behav ior of annealed OFHC copper. The analytical predictions of the constitutive description are compared with the experimental data reported by Nemat Nasser and Li (Nemat Nasser, S., Li, Y., (1998). Flow stress of FCC polycrystals with application to OFHC Copper. Acta Mater. 46, 565 577). Good correlation between experiments and analytical predictions is found within wide ranges of strain rate and temperature.

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“…of β typically ranges from 80 to 100% [Campagne et al 2005;Guo et al 2005] -in other words, between 80% or 100% of the plastic work is supposed to be converted into heat. However many experimental investigations have shown that the proportion of plastic work dissipated as heat is strongly dependent on temperature, strain and strain rate.…”

Section: Introductionmentioning

confidence: 99%

Inelastic heat fraction evaluation for engineering problems involving dynamic plastic localization phenomena

Longère

Dragon²

2009

J. Mech. Mater. Struct.

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The evaluation of the temperature produced during adiabatic dissipative processes for a large class of engineering materials (metals and some polymers) remains a major subject of interest, notably in the fields of high-speed machining and impact dynamics. The hypothesis consisting in considering the proportion of plastic work dissipated as heat (quantified by the inelastic heat fraction β) as independent on the loading path is now recognized as highly simplistic. Experimental investigations have shown indeed the dependence of the inelastic heat fraction on strain, strain rate and the temperature itself. The theoretical studies available nowadays are not entirely conclusive on various features regarding the history dependence and the evolution of β. The present work attempts to provide a systematic approach to the temperature rise and the inelastic heat fraction evolution for a general loading within the framework of thermoelastic/viscoplastic standard modelling including a number of quantitative variants regarding strain hardening/thermal softening and thermomechanical coupling description. The theoretical results thus obtained are confronted with experimental data from the literature. An analysis of the effects of various model simplifications on the evaluation of temperature growth with regard to conditions for dynamic plastic localization occurrence is also carried out. It is shown that the value of critical shear strain at localization incipience is strongly dependent on the level of simplification admitted.

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A physically based model for dynamic failure in ductile metals

Cited by 27 publications

References 19 publications

A physically-based and fully coupled model of elasto-plasticity and damage for dynamic failure in ductile metals

A physically-based and fully coupled model of elasto-plasticity and damage for dynamic failure in ductile metals

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

Inelastic heat fraction evaluation for engineering problems involving dynamic plastic localization phenomena

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