A nonlinear CDM model for ductile failure

Bonora, Nicola

doi:10.1016/s0013-7944(97)00074-x

Cited by 357 publications

(200 citation statements)

References 23 publications

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“…The effective porosity f * is defined such that damage initiates at a threshold porosity f t , and that failure occurs when d reaches a critical value d c corresponding to the critical porosity f c . 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: 91%

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: 91%

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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“…uctile crack initiation and propagation analysis in CCB was performed using Bonora's damage model [16]. This model is derived in the framework of continuum damage mechanics and was verified for different classes of metals and alloys [17].…”

Section: Ductile Tearing Analysismentioning

confidence: 99%

Use of Circumferentially Cracked Bar sample for CTOD fracture toughness determination in the upper shelf regime

Gentile

Persechino

Bonora

et al. 2014

Frattura Ed Integrità Strutturale

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ABSTRACT. In this work, the use of circumferentially cracked bar (CCB) sample to determine material fracture toughness in the upper shelf regime for carbon steels has been investigated. Since high fracture toughness materials are known to exhibit extensive crack tip blunting before ductile crack initiation, accurate specimen design is required to provide realistic fracture toughness measurement. Here, a CCB was designed to have similar loss of constraint as for SENT sample. Continuum damage mechanics was used to predict the occurrence of ductile crack initiation and propagation. Finite element analysis was performed to predict specimen response and to compare computed J-integral crack driving force with measured CTOD. Finally, experimental tests were performed on X65 carbon steel and the measured critical CTOD was compared with available fracture data obtained with SENT.

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“…Under quasi-static loading, stress triaxiality is determined by the geometry while under dynamic loading, stress triaxiality depends on the interaction of stress waves. In the CDM model proposed by Bonora [6], ductile damage accumulates with the active plastic strain that is the total equivalent plastic strain accumulated under positive (tensile) state of stress. Damage effects, such as the reduction of the elastic stiffness, are temporarily restored under compressive state of stress.…”

Section: Damage Assessmentmentioning

confidence: 99%

“…the active plastic strain p, exceeds the corresponding p th value. Once damage initiation condition is satisfied, damage accumulation with plastic strain would occurs accordingly to the kinetic law of evolution [6]. Under the assumption of constant stress triaxiality deformation process the failure locus can be determined as given in Eq.…”

Section: Damage Assessmentmentioning

confidence: 99%

Ductile damage evolution in high purity copper taylor impact test

Bonora¹,

Ruggiero²,

Iannitti³

et al. 2012

AIP Conference Proceedings

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Abstract.Recently, the continuum damage mechanics model proposed by Bonora (Eng. Fract. Mech. 58, 1997) has been updated to account for stress triaxiality effect on model parameters, (Bonora et al., AIP Conf. Proc. 1195, 2009. This model enhancement allows to predict ductile damage initiation under varying stress states (uniaxial stress, uniaxial strain, and complex load paths) and dynamic loading conditions. In this work, the model has been used to investigate ductile damage developments in Taylor anvil and symmetric Taylor impact (rod-on-rod) configuration. Although the two configurations are equivalent for right scaled impact velocities, experimental evidences show that when ductile damage occurs in rod-on-rod not necessarily also develops in Taylor anvil impact. It has been found that, in the two impact configurations, the stress triaxiality builds up differently with plastic strain leading to different conditions for ductile damage initiation. Taylor impact tests have been designed and performed with the gas-gun facility at the University of Cassino. Damage investigation results obtained on recovered samples have been compared with rod-on-rod data reported in the literature and used to validate the proposed model predictions.

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A nonlinear CDM model for ductile failure

Cited by 357 publications

References 23 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

Use of Circumferentially Cracked Bar sample for CTOD fracture toughness determination in the upper shelf regime

Ductile damage evolution in high purity copper taylor impact test

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