A gradient-extended two-surface damage-plasticity model for large deformations

Brepols, Tim; Wulfinghoff, Stephan; Reese, Stefanie

doi:10.1016/j.ijplas.2019.11.014

Cited by 63 publications

(30 citation statements)

References 159 publications

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“…Furthermore, it would be worthwhile to examine the influence of potential finite element mesh dependencies, which might occur when using conventional, 'local' continuum damage models. A suitable approach for this was presented by Brepols et al [5] for small strains and has only recently been extended to finite deformations by Brepols et al [6]. The authors used a gradient-extension in order to obtain a non-local version of the model.…”

Section: Resultsmentioning

confidence: 99%

Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber

Barfusz

Hötte

Reese

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Rocket engine nozzle structures typically fail after a few engine cycles due to the extreme thermomechanical loading near the nozzle throat. In order to obtain an accurate lifetime prediction and to increase the lifetime, a detailed understanding of the thermomechanical behavior and the acting loads is indispensable. The first part is devoted to a thermally coupled simulation (conjugate heat transfer) of a fatigue experiment. The simulation contains a thermal FEM model of the fatigue specimen structure, RANS simulations of nine cooling channel flows and a Flamelet-based RANS simulation of the hot gas flow. A pseudo-transient, implicit Dirichlet–Neumann scheme is utilized for the partitioned coupling. A comparison with the experiment shows a good agreement between the nodal temperatures and their corresponding thermocouple measurements. The second part consists of the lifetime prediction of the fatigue experiment utilizing a sequentially coupled thermomechanical analysis scheme. First, a transient thermal analysis is carried out to obtain the temperature field within the fatigue specimen. Afterwards, the computed temperature serves as input for a series of quasi-static mechanical analyses, in which a viscoplastic damage model is utilized. The evolution and progression of the damage variable within the regions of interest are thoroughly discussed. A comparison between simulation and experiment shows that the results are in good agreement. The crucial failure mode (doghouse effect) is captured very well.

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Section: Resultsmentioning

confidence: 99%

Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber

Barfusz

Hötte

Reese

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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“…Inserting the discretisation (15) into the weak forms (11) and (12) allows us to separate the nodal values from the test functions, and, together with the definitions of the internal and external forces…”

Section: Discretisationmentioning

confidence: 99%

“…Therefore, plasticity can evolve even in highly damaged material states. The recently published model [11], which includes kinematic hardening, follows a conceptually similar multi-surface approach as established as this work proceeds. Analogous to the effective stress, a novel effective damage driving force is proposed.…”

Section: Introductionmentioning

confidence: 99%

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

Sprave

Menzel

2020

Acta Mech

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A gradient-enhanced ductile damage model at finite strains is presented, and its parameters are identified so as to match the behaviour of DP800. Within the micromorphic framework, a multi-surface model coupling isotropic Lemaitre-type damage to von Mises plasticity with nonlinear isotropic hardening is developed. In analogy to the effective stress entering the yield criterion, an effective damage driving force—increasing with increasing plastic strains—entering the damage dissipation potential is proposed. After an outline of the basic model properties, the setup of the (micro)tensile experiment is discussed and the importance of including unloading for a parameter identification with a material model including damage is emphasised. Optimal parameters, based on an objective function including measured forces and the displacement field obtained from digital image correlation, are identified. The response of the proposed model is compared to a tensile experiment of a specimen with a different geometry as a first approach to validate the identified parameters.

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“…Choosing damage itself for the gradient-extension is of course not a unique choice, however, the very good experience of our research group following this approach for different kinds of inelastic and anisotropic material effects (see e.g. [3,4]) motivates this choice.…”

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confidence: 99%

A novel gradient-extended anisotropic two-surface damage-plasticity model for finite deformations

Holthusen¹,

Brepols²,

Reese³

et al. 2021

16th Edition of the Inernational Conference on Computational Plasticity

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Modelling as well as simulation of materials behaving both brittle and/or ductile in connection with anisotropic damage is still a challenging task, especially in the case of finite deformations. This has already been intensively discussed in our recently published work of Reese et al. [1], which, however, uses a different kinematic approach than the one that will be presented here. In addition to the formulation of a constitutive law, a mesh-independent formulation in the presence of large deformations is essential from a computational point of view. Therefore, in the presented work, both a thermodynamically consistent elasto-damage-plasticity material formulation and its gradientextension -based on the invariants of the damage tensor -are discussed, which can be understood as a micromorphic extension following Forest [2]. Thus, although a second order damage tensor is used, only three additional (micromorphic) fields are required to account for the nonlocal nature of damage. Choosing damage itself for the gradient-extension is of course not a unique choice, however, the very good experience of our research group following this approach for different kinds of inelastic and anisotropic material effects (see e.g. [3,4]) motivates this choice.

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A gradient-extended two-surface damage-plasticity model for large deformations

Cited by 63 publications

References 159 publications

Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber

Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber

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

A novel gradient-extended anisotropic two-surface damage-plasticity model for finite deformations

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