Gradient-Enhanced Plasticity In Explicit Dynamics

  • The simulation of concrete under impact and blast loads often relies on local constitutive models, typically formulated as plasticity models that incorporate softening through a scalar damage field. However, these local damage models frequently exhibit mesh-dependent results that fail to converge with mesh refinement. In earlier work, the mesh-dependency of a modified Johnson-Holmquist (JH2) model was effectively mitigated through a gradient-enhanced plasticity formulation in explicit dynamics [1]. The gradient-enhancement method for explicit dynamics, originally introduced in [3], involves modifying Peerlings' additional partial differential equation [2] for nonlocal equivalent plastic strain by incorporating inertia. This modification enables the use of explicit solvers, such as the central difference method. Despite these advancements, the model continues to face challenges, particularly slow convergence rates with mesh refinement, which are difficult to analyze due to the JH2The simulation of concrete under impact and blast loads often relies on local constitutive models, typically formulated as plasticity models that incorporate softening through a scalar damage field. However, these local damage models frequently exhibit mesh-dependent results that fail to converge with mesh refinement. In earlier work, the mesh-dependency of a modified Johnson-Holmquist (JH2) model was effectively mitigated through a gradient-enhanced plasticity formulation in explicit dynamics [1]. The gradient-enhancement method for explicit dynamics, originally introduced in [3], involves modifying Peerlings' additional partial differential equation [2] for nonlocal equivalent plastic strain by incorporating inertia. This modification enables the use of explicit solvers, such as the central difference method. Despite these advancements, the model continues to face challenges, particularly slow convergence rates with mesh refinement, which are difficult to analyze due to the JH2 model's complexity. To address these challenges, this study investigates simpler plasticity models, such as von Mises plasticity and Drucker-Prager plasticity, combined with a nonlocal softening term. By systematically incorporating key characteristics of the JH2 model—namely, pressure-dependent yield surfaces, softening, residual yield strength at full damage and a nonlinear volumetric stress responses via an equation of state (EOS)—this work aims to further refine the gradient-enhanced JH2 model and extend these improvements to more complex plasticity models like the RHT model.zeige mehrzeige weniger

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Metadaten
Autor*innen:Sjard Mathis RosenbuschORCiD
Koautor*innen:Jörg F. UngerORCiD, Daniel BalzaniORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.7 Modellierung und Simulation
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Concrete modeling; Gradient-enhancement; Mesh Convergence; Plasticity
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Green Intelligent Building
Infrastruktur / Security
Veranstaltung:GACM 2025
Veranstaltungsort:Braunschweig, Germany
Beginndatum der Veranstaltung:21.09.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:07.11.2025
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Nein
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