Session Details
MS09-2: Damage Mechanics and Numerical Applications (Ganzes Minisymposium anzeigen)
Wednesday, 11. October 2017; 16:00 - 18:00 Uhr in Raum 7.11
Sitzungsleitung: Katrin Schulz
16:00
Comparative study of finite-element-based fatigue analysis concepts for adhesive joints in wind turbine rotor blades
Pablo Noever Castelos (Leibniz Universität Hannover), Michael Wentingmann (Leibniz Universität Hannover), Claudio Balzani (Leibniz Universität Hannover)
Kurzfassung:
This contribution aims to clarify the need for considering non-proportionality in the fatigue analysis of adhesive joints of wind turbine rotor blades. The comparison covers three different blade configurations (Length: 20 m, 40 m and 80 m) in order to derive generalized conclusions by extracting a correlation between non-proportionality, radial position and blade size. The results further indicate which type of fatigue analysis has to be performed for reliable life estimations.
Comparative study of finite-element-based fatigue analysis concepts for adhesive joints in wind turbine rotor blades
Pablo Noever Castelos (Leibniz Universität Hannover), Michael Wentingmann (Leibniz Universität Hannover), Claudio Balzani (Leibniz Universität Hannover)
Kurzfassung:
This contribution aims to clarify the need for considering non-proportionality in the fatigue analysis of adhesive joints of wind turbine rotor blades. The comparison covers three different blade configurations (Length: 20 m, 40 m and 80 m) in order to derive generalized conclusions by extracting a correlation between non-proportionality, radial position and blade size. The results further indicate which type of fatigue analysis has to be performed for reliable life estimations.
16:20
A gradient-extended elastic isotropic damage model considering crack-closure
Marek Fassin (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
In this work an elastic isotropic damage model considering crack-closure and irreversible strains is discussed. After having introduced the model equations of the local model, results of a simple uniaxial strain controlled test on Gauss-point level are presented. Subsequently, the gradient extension of the model (micromorphic approach) is summarized briefly. Finally, the model's properties and robustness are demonstrated by means of a finite element computation of a single edge-notched plate under shear loading, where an adaptive mesh refinement is utilized.
A gradient-extended elastic isotropic damage model considering crack-closure
Marek Fassin (RWTH Aachen University), Stephan Wulfinghoff (RWTH Aachen University), Stefanie Reese (RWTH Aachen University)
Kurzfassung:
In this work an elastic isotropic damage model considering crack-closure and irreversible strains is discussed. After having introduced the model equations of the local model, results of a simple uniaxial strain controlled test on Gauss-point level are presented. Subsequently, the gradient extension of the model (micromorphic approach) is summarized briefly. Finally, the model's properties and robustness are demonstrated by means of a finite element computation of a single edge-notched plate under shear loading, where an adaptive mesh refinement is utilized.
16:40
A simplified damage model for unilateral behavior of concrete
Ajmal Hasan Monnamitheen Abdul Gafoor (Technical University of Braunschweig), Dieter Dinkler (Technical University of Braunschweig)
Kurzfassung:
For complex loadings of concrete structures as earthquakes, cyclic and dynamic conditions must be taken into account. Therefore a simplified damage model which uses an equivalent strain in terms of invariants of elastically predicted stresses is developed. The model is introduced by two history deformation parameters related to the equivalent strain in order to describe unilateral behavior of concrete. Thus the model can simulate the distinct behavior of concrete under monotonic/cyclic loadings.
A simplified damage model for unilateral behavior of concrete
Ajmal Hasan Monnamitheen Abdul Gafoor (Technical University of Braunschweig), Dieter Dinkler (Technical University of Braunschweig)
Kurzfassung:
For complex loadings of concrete structures as earthquakes, cyclic and dynamic conditions must be taken into account. Therefore a simplified damage model which uses an equivalent strain in terms of invariants of elastically predicted stresses is developed. The model is introduced by two history deformation parameters related to the equivalent strain in order to describe unilateral behavior of concrete. Thus the model can simulate the distinct behavior of concrete under monotonic/cyclic loadings.
17:00
A continuum damage model for delamination and intralaminar damage in composite laminates
Jaan-Willem Simon (RWTH Aachen University), Daniel Höwer (RWTH Aachen University), Stefanie Reese (RWTH Aachen University), Jacob Fish (Columbia University)
Kurzfassung:
An orthotropic continuum damage model is presented in this paper, which enables accounting for the interaction of damage evolution in different directions. Thereby, uniaxial loading states can lead to different damage progression in directions other than the loading direction. The model is thermodynamically consistent and mesh objective due to use of an energy based regularization scheme. It is shown that the model can be successfully applied on different scales.
A continuum damage model for delamination and intralaminar damage in composite laminates
Jaan-Willem Simon (RWTH Aachen University), Daniel Höwer (RWTH Aachen University), Stefanie Reese (RWTH Aachen University), Jacob Fish (Columbia University)
Kurzfassung:
An orthotropic continuum damage model is presented in this paper, which enables accounting for the interaction of damage evolution in different directions. Thereby, uniaxial loading states can lead to different damage progression in directions other than the loading direction. The model is thermodynamically consistent and mesh objective due to use of an energy based regularization scheme. It is shown that the model can be successfully applied on different scales.
17:20
A viscoelastic-viscoplastic constitutive model with damage for thermoplastics under creep-type loading
Benjamin Schneider (Robert Bosch GmbH), Patrick Zerbe (Robert Bosch GmbH), Egon Moosbrugger (Robert Bosch GmbH), Michael Kaliske (Technische Universität Dresden)
Kurzfassung:
In this contribution tensile experiments with constant load over time and with cyclically removed load are presented. The dog bone specimens out of polyoxymethylene show time dependent reversible as well as irreversible deformations followed by breakage. To reproduce this, a viscoelastic-viscoplastic constitutive model with damage and recovery is applied. Since the occurring deformations are large, an approximative large strain formulation is used still allowing an additive strain split.
A viscoelastic-viscoplastic constitutive model with damage for thermoplastics under creep-type loading
Benjamin Schneider (Robert Bosch GmbH), Patrick Zerbe (Robert Bosch GmbH), Egon Moosbrugger (Robert Bosch GmbH), Michael Kaliske (Technische Universität Dresden)
Kurzfassung:
In this contribution tensile experiments with constant load over time and with cyclically removed load are presented. The dog bone specimens out of polyoxymethylene show time dependent reversible as well as irreversible deformations followed by breakage. To reproduce this, a viscoelastic-viscoplastic constitutive model with damage and recovery is applied. Since the occurring deformations are large, an approximative large strain formulation is used still allowing an additive strain split.