A large strain gradient-enhanced ductile damage model: finite element formulation, experiment and parameter identification

Sprave, Leon; Menzel, Andreas

doi:10.1007/s00707-020-02786-5

Cited by 26 publications

(26 citation statements)

References 62 publications

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“…In the remaining references, the higher order stresses are decomposed into reversible and dissipative contributions. Enhancements of damage models for simulation of crack initiation and propagation have been proposed recently based on the micromorphic approach, see [89][90][91][92]. The micromorphic approach can also be useful to ease numerical implementation of phase field models as demonstrated recently for twinning plasticity in [93].…”

Section: Discussionmentioning

confidence: 99%

Toward robust scalar-based gradient plasticity modeling and simulation at finite deformations

Abatour¹,

Forest²,

Ammar³

et al. 2022

Acta Mech

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Strain gradient plasticity has been the subject of extensive research in the past forty years in order to model size effects in metal plasticity, on the one hand, and provide finite width shear bands in the simulation of localization phenomena, on the other hand. However, the use of the emerging models is still limited to academic applications and has not yet been adopted by industry practitioners. The present paper systematically reviews the pros and the cons of gradient plasticity at finite strains based on gradient of scalar plastic variables, in particular gradient of the cumulative plastic strain. It proposes benchmark tests addressing both size effect modeling and plastic strain localization simulation. It includes new analytical solutions for validation of FE implementation. It focuses on the micromorphic approach to gradient plasticity, as a convenient method for implementation in FE codes. New features of the analysis include the comparison of three distinct formulations of rate-independent gradient plasticity at finite deformations, based on the multiplicative decomposition of the deformation gradient and on quadratic potentials with respect to gradient terms. The performance of micromorphic and Lagrange-multiplier based strain gradient plasticity models is evaluated for various monotonic and cyclic loading conditions including confined plasticity in simple glide and tension, bending and torsion at large deformations. Limitations are pointed out in the case of bending and torsion, which can be overcome for instance by the use of the gradient of equivalent plastic strain model.

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Section: Discussionmentioning

confidence: 99%

Toward robust scalar-based gradient plasticity modeling and simulation at finite deformations

Abatour¹,

Forest²,

Ammar³

et al. 2022

Acta Mech

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“…At first, plastic anisotropy will not be considered such that the application of finite plasticity based on a multiplicative split of the total deformation is straightforward. The implementation is based on [13] , where the approach has already been extended to incorporate gradient-damage. The flexibility of a user material is necessary especially for our later extension to incorporate the inherent material softening of ductile damage and its physically motivated regularization by gradient-enhancement.…”

Section: Materials Modelmentioning

confidence: 99%

Numerical analysis of failure modeling in clinching process chain simulation

Bielak

2023

Materials Research Proceedings

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Abstract. The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation.

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“…Unfortunately, in commercial software it is difficult to implement such strategy even with the use of user-subroutines. Another solution is represented by models adopting the definition of gradient-like formulation of the internal variables [132][133][134]. Alternatively, a common and easy solution is to set a value of the critical damage D c small enough (0.2~0.3) to avoid localization.…”

Section: Models Comparison and Computational Aspectsmentioning

confidence: 99%

Ductile fracture modeling of metallic materials: a short review

Fincato

Tsutsumi

2021

Frattura Ed Integrità Strutturale

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Since the end of the last century a lot of research on ductile damaging and fracture process has been carried out. The interest and the attention on the topic are due to several aspects. The margin to reduce the costs of production or maintenance can be still improved by a better knowledge of the ductile failure, leading to the necessity to overcome traditional approaches. New materials or technologies introduced in the industrial market require new strategies and approaches to model the metal behavior. In particular, the increase of the computational power together with the use of finite elements (FE), extended finite elements (X-FE), discrete elements (DE) methods need the formulation of constitutive models capable of describing accurately the physical phenomenon of the damaging process. Therefore, the recent development of novel constitutive models and damage criteria. This work offers an overview on the current state of the art in non-linear deformation and damaging process reviewing the main constitutive models and their numerical applications.

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A large strain gradient-enhanced ductile damage model: finite element formulation, experiment and parameter identification

Cited by 26 publications

References 62 publications

Toward robust scalar-based gradient plasticity modeling and simulation at finite deformations

Toward robust scalar-based gradient plasticity modeling and simulation at finite deformations

Numerical analysis of failure modeling in clinching process chain simulation

Ductile fracture modeling of metallic materials: a short review

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