A ductile fracture analysis using a local damage model

Benseddiq, Noureddine; Imad, A.

doi:10.1016/j.ijpvp.2007.09.003

Cited by 115 publications

(58 citation statements)

References 30 publications

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“…Moreover, fc is not only a material parameter, but depends on several factors as f0 or stress triaxiality. For instance, fc increases if f0 increases [40]. Our results show that for DCI, fc is also dependent on temperature when a critical value is reached.…”

Section: Void Growth Damage Model With Temperature For Monotonous Tenmentioning

confidence: 61%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used OPEN ACCESSMetals 2015, 5 2352 as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K.

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Section: Void Growth Damage Model With Temperature For Monotonous Tenmentioning

confidence: 61%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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“…(8) as a function of plastic strain is obtained from the uniaxial tension test data provided by the experimental group. The initial GTN model parameters of steels are based on refs (Bauvineau et al 1996;Decamp et al 1997;Siegmund et al 1998;Schmitt et al 1997;Skallerud and Zhang 1997;Benseddiq and Imad 2008). q 1 = 1.5, q 2 = 1, E N = 0.3, S N = 0.1, f 0 ≈ 0 and f F ≈ 0.2 are the standard material parameters for steel.…”

Section: Calibration Of Materials Model and Failure Parametersmentioning

confidence: 99%

The Sandia Fracture Challenge: blind round robin predictions of ductile tearing

et al. 2014

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Existing and emerging methods in computational mechanics are rarely validated against problems with an unknown outcome. For this reason, Sandia National Laboratories, in partnership with US National Science Foundation and Naval Surface Warfare Center Carderock Division, launched a computational challenge in mid-summer, 2012. Researchers and engineers were invited to predict crack initiation and propagation in a simple but novel geometry fabricated from a common off-the-shelf commercial engineering alloy. The goal of this international Sandia Fracture Challenge was to benchmark the capabilities for the prediction of deformation and damage evolution associated with ductile tearing in structural metals, including physics models, computational methods, and numerical implementations currently available in the computational fracture community. Thirteen teams participated, reporting blind predictions for the outcome of the Challenge. The simulations and experiments were performed independently and kept confidential. The methElectronic supplementary material The online version of this article (doi:10.1007/s10704-013-9904-6) contains supplementary material, which is available to authorized users.Sandia National Laboratories, Albuquerque, NM, USA e-mail: blboyce@sandia.gov ods for fracture prediction taken by the thirteen teams ranged from very simple engineering calculations to complicated multiscale simulations. The wide variation in modeling results showed a striking lack of consistency across research groups in addressing problems of ductile fracture. While some methods were more successful than others, it is clear that the problem of ductile fracture prediction continues to be challenging. Specific areas of deficiency have been identified through this effort. Also, the effort has underscored the need for additional blind prediction-based assessments.

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“…A numerical algorithm based on Cockcroft-Latham criterion (Choi et al 2010) and Gurson-TvergaardNeedleman damage model (Tang et al 2011) was applied to study the damage evolution in the cold extrusion and the multi-pass wire drawing process respectively. The damage criteria are classified into coupled approaches which incorporate damage accumulation into the constitutive equations (Tvergaard 1990;La Rosa et al 2001;Benseddiq and Imad 2008;Xue et al 2010) and uncoupled categories which neglect the effects of damage on the yield surface of materials (Ayada et al 1984;Alberti et al 1993;Wierzbicki et al 2005). This latter approach has been widely adopted due to its simple formulation and ease of calibration.…”

Section: Introductionmentioning

confidence: 99%

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

2012

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The objective of the present work is to predict the formation of chevron crack in copper wire drawing process. The first part of this paper is to determine the chevron crack formation initiated by a central burst inside the wire material using experimental tests. These results are compared with results from a series of numerical simulations using the CockcroftLatham fracture criterion. The second part of this work concerns the determination of a curve that divides the chevron and safe zones for a better wire drawing process. The conditions of central burst defects formation along the wire axis depend on drawing parameters and friction coefficient between the die and the wire. The friction coefficient is defined as a linear function of temperature rise which is measured close to the wiredie interface. The obtained results show that the friction A. Haddi (B) Laboratoire Génie Civil et géo-Environnement (LGCgE), coefficient depending on temperature rise during wire drawing has an impact on the damage of copper wire.

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A ductile fracture analysis using a local damage model

Cited by 115 publications

References 30 publications

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

The Sandia Fracture Challenge: blind round robin predictions of ductile tearing

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

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