CDM modeling of ductile failure in ferritic steels: Assessment of the geometry transferability of model parameters

Bonora, Nicola; Ruggiero, Andrew; Esposito, Luca; Gentile, Domenico

doi:10.1016/j.ijplas.2006.03.013

Cited by 97 publications

(39 citation statements)

References 46 publications

(49 reference statements)

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“…The model, which results in a non linear damage accumulation with active plastic strain, requires the knowledge of four damage parameters, all having a physical meaning: the damage threshold strain, " th , at which damage processes initiates; the theoretical failure strain under constant uniaxial state of stress conditions, " f , at which ductile failure would occur; the critical damage, D cr , at which failure occurs; and the damage exponent, ↵, that controls the shape of damage evolution with plastic strain. The parameters can be easily identified with uniaxial tensile tests on smooth and round notched specimen geometries [13,14]. The values for the annealed OFHC 99.98% Cu are given in Table 1.…”

Section: Constitutive Materials Modelmentioning

confidence: 99%

Deformation and failure of OFHC copper under high strain rate shear compression

Ruggiero¹,

Testa²,

Bonora³

et al. 2017

AIP Conference Proceedings

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Abstract. Hat-shaped specimen geometries were developed to generate high strain, high-strain-rates deformation under prescribed conditions. These geometries o↵er also the possibility to investigate the occurrence of ductile rupture under low or negative stress triaxiality, where most failure models fail. In this work, three tophat geometries were designed, by means of extensive numerical simulation, to obtain desired stress triaxiality values within the shear region that develops across the ligament. Material failure was simulated using the Continuum Damage Model (CDM) formulation with a unilateral condition for damage accumulation and validated by comparing with quasi-static and high strain rate compression tests results on OFHC copper. Preliminary results seem to indicate that ductile tearing initiates at the specimen corner location where positive stress triaxiality occurs because of local rotation and eventually propagates along the ligament.

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Section: Constitutive Materials Modelmentioning

confidence: 99%

Deformation and failure of OFHC copper under high strain rate shear compression

Ruggiero¹,

Testa²,

Bonora³

et al. 2017

AIP Conference Proceedings

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“…소위 GTN ( (Lemaitre, 1985;Bonora et al, 2006;Choung, 2009b). (Bao and Wierzbicki, 2004;Bao, 2005;Choung et al, 2012;Choung and Nam, 2013;Choung et al, 2014a;Choung et al, 2014b).…”

Section: 서 론mentioning

confidence: 99%

Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies

Chong¹,

Park²,

Kim³

2015

Journal of Ocean Engineering and Technology

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ABSTRACT:The stress triaxiality and lode angle are known to be most dominant fracture parameters in ductile materials. This paper proposes a three-dimensional failure strain surface for a ductile steel, called a low-temperature high-tensile steel (EH36), using average stress triaxiality and average normalized lode parameter, along with briefly introducing their theoretical background. It is an extension of previous works by Choung et al. (2011;2014a;2014b) and Choung and Nam (2013)

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“…This model is derived in the framework of continuum damage mechanics and was verified for different classes of metals and alloys [17]. In this model, damage affects only the elastic stiffness while damage effects flow stress are taken into account in the definition of the material flow curve, leading to a non-softening formulation, which has the advantage to avoid mesh dependency of the solution.…”

Section: Ductile Tearing Analysismentioning

confidence: 99%

“…The model requires only four material parameters to be determined: th  the threshold strain at which damage processes initiates; f  the failure strain under constant uniaxial constant stress triaxiality; cr D , the critical damage at rupture and the shape factor  . These parameters are characteristic of the material and do not depend on the geometry [17]. The damage rate is given by the following expression,…”

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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CDM modeling of ductile failure in ferritic steels: Assessment of the geometry transferability of model parameters

Cited by 97 publications

References 46 publications

Deformation and failure of OFHC copper under high strain rate shear compression

Deformation and failure of OFHC copper under high strain rate shear compression

Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies

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

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