A Lode-dependent enhanced Lemaitre model for ductile fracture prediction at low stress triaxiality

Cao, Trong-Son; Gachet, Jean-Marie; Montmitonnet, Pierre; Bouchard, Pierre‐Olivier

doi:10.1016/j.engfracmech.2014.03.021

Cited by 131 publications

(55 citation statements)

References 45 publications

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“…Recently, Lou et al (2014) showed that this value is far from universal and they proposed a relation between the cutoff value of stress triaxiality and a Lode variable L (L = (2 2 − 1 − 3 )/( 1 − 3 )). In a parallel submitted paper (Cao et al, 2015), the influence of the changeable cutoff value (−1/3 or −2/3 as proposed by Xue, 2007) on damage prediction with the Bai & Wierzbicki (Bai and Wierzbicki, 2008), Lemaitre and the LEL (Cao et al, 2014b) models was investigated. The results showed that this choice has a negligible effect on the wire drawing process, but a strong influence on damage distribution is observed for the wire flat rolling process.…”

Section: The Lemaitre Damage Modelmentioning

confidence: 99%

Comparison of reduction ability between multi-stage cold drawing and rolling of stainless steel wire – Experimental and numerical investigations of damage

Cao

Vachey²,

Montmitonnet

et al. 2015

Journal of Materials Processing Technology

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Section: The Lemaitre Damage Modelmentioning

confidence: 99%

Comparison of reduction ability between multi-stage cold drawing and rolling of stainless steel wire – Experimental and numerical investigations of damage

Cao

Vachey²,

Montmitonnet

et al. 2015

Journal of Materials Processing Technology

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“…Bai and Wierzbicki, 2008;Cao et al, 2015a,b, modified MohrCoulomb (Bai andWierzbicki, 2010;Dunand and Mohr, 2011;Cao et al, 2013)) and coupled models (e.g. Xue model -Xue, 2007;Cao, 2014; Lode-dependent enhanced Lemaitre model - Cao et al, 2014a). However, due to their phenomenological grounds, their application outside the identification domain needs special attention.…”

Section: Introductionmentioning

confidence: 96%

A model for ductile damage prediction at low stress triaxialities incorporating void shape change and void rotation

Cao

Mazière

Danas

et al. 2015

International Journal of Solids and Structures

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International audienceDuctile fracture at the high triaxiality regime is well-known to be controlled by void nucleation, growth and coalescence. However, under low stress triaxiality conditions and general three dimensional finite deformations, damage is still poorly predicted due to the complex loading state and microstructural changes under such a condition. Experimental results have revealed not only void growth, but also important void shape change and void rotation under shear-dominated loading. The ability of ductile damage models to predict both void growth with shape change and void rotation is thus crucial for complex loading applications. In the present study, a Gurson-like nonlinear homogenization-based model (namely GVAR) is proposed and compared with the constitutive models for elasto-plastic porous materials developed in Kailasam and Ponte Castañeda (1998) (VAR model) and Danas and Aravas (2012) (MVAR model). The proposed model is based on ad hoc modifications of the VAR model, to give sufficiently accurate results for void growth at both low and high stress triaxialities and keeping the functional form of the original Gurson model. The VAR and MVAR models were based on rigorous linear comparison composite (LCC) homogenization methods, which can describe the evolution of microstructure of porous materials, represented by the void volume fraction, the aspect ratios and the orientations of general ellipsoidal voids. The proposed GVAR model thus inherits these characteristics and provides a sufficiently accurate void growth formulation (and simple at the same time). In addition, the loading direction is not necessary aligned with the ellipsoidal void axes. These models are implemented in an object-oriented finite element (FE) code. The identification of model parameters and the assessment of the proposed model are then carried out via 3D periodic unit-cell computations subjected to different stress states. Comparative results show that the present model predicts relatively accurately the evolution of void volume fraction, void aspect ratios and void rotation for different initial void shapes, void volume fractions and under different stress triaxiality levels. A qualitative application to a tensile test on a notched round bar shows the efficiency of the model to predict microstructure evolution (i.e. voids volume, shape and orientation) in a real-scale model simulation. This model with few parameters to be identified is thus promising to predict damage under complex loading paths and ready to be applied to complex FE simulations

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“…It is worth mentioning that the coupled damage model considered in this work only takes into account the value of stress triaxiality to characterize the stress state, despite of the clear difference of stress conditions between the tests used for the material characterization (tensile test) and the final application (blanking). This indicates that the use of the Lode parameter is of great importance in the development of advanced damage models, specially in the case of sheardominated failure as suggested in recent works [9,17,19,24]. …”

Section: Numerical Predictions In Blankingmentioning

confidence: 86%

Numerical prediction of ductile failure in the blanking process by means of uncoupled and coupled phenomenological damage models

Canales

Ponthot

2016

MATEC Web Conf.

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Abstract. Fracture prediction in blanking has gained great attention due to increasing requirements of high-quality products. In this work, the predictive capabilities of different uncoupled and coupled damage models, recently implemented in a fully implicit homemade FE code, for blanking process are compared. Some advanced models considered here include damage sensitivity to both triaxiality and Lode angle in their formulation. The material characterization is based on the history of internal variables during loading, where different mechanical tests are considered. Finally, numerical and experimental results are compared for a wide range of different geometries of blanking.

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A Lode-dependent enhanced Lemaitre model for ductile fracture prediction at low stress triaxiality

Cited by 131 publications

References 45 publications

Comparison of reduction ability between multi-stage cold drawing and rolling of stainless steel wire – Experimental and numerical investigations of damage

Comparison of reduction ability between multi-stage cold drawing and rolling of stainless steel wire – Experimental and numerical investigations of damage

A model for ductile damage prediction at low stress triaxialities incorporating void shape change and void rotation

Numerical prediction of ductile failure in the blanking process by means of uncoupled and coupled phenomenological damage models

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