Anisotropic damage behavior in fiber-based materials: Modeling and experimental validation

• Published in: Journal of the mechanics and physics of solids Vol. 181; p. 105430
• Main Authors: Alzweighi, Mossab, Tryding, Johan, Mansour, Rami, Borgqvist, Eric, Kulachenko, Artem
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2023
• Subjects: Anisotropic damage; Anisotropic plasticity; Applied Mechanics; Engineering and Technology; Fiber-based materials; Gradient enhancement; Maskinteknik; Mechanical Engineering; Teknik; Teknisk mekanik; Thermodynamically consistent; Fiber-based materials; Thermodynamically consistent; Gradient enhancement; Anisotropic plasticity; Anisotropic damage
• ISSN: 0022-5096; 1873-4782
• DOI: 10.1016/j.jmps.2023.105430

This study presents a thermodynamically consistent continuum damage model for fiber-based materials that combines elastoplasticity and damage mechanisms to simulate the nonlinear mechanical behavior under in-plane loading. The anisotropic plastic response is characterized by a non-quadratic yield surface composed of six sub-surfaces, providing flexibility in defining plastic properties and accuracy in reproducing material response. The damage response is modeled based on detailed uniaxial monotonic and cyclic tension-loaded experiments conducted on specimens extracted from a paper sheet in various directions. To account for anisotropic damage, we propose a criterion consisting of three sub-surfaces representing tension damage in the in-plane material principal directions and shear direction, where the damage onset is determined through cyclic loading tests. The damage evolution employs a normalized fracture energy concept based on experimental observation, which accommodates an arbitrary uniaxial loading direction. To obtain a mesh-independent numerical solution, the model is regularized using the implicit gradient enhancement by utilizing the linear heat equation solver available in commercial finite-element software. The study provides insights into the damage behavior of fiber-based materials, which can exhibit a range of failure modes from brittle-like to ductile, and establishes relationships between different length measurements. •The study presents a continuum damage model combining elastoplasticity and damage mechanisms to simulate the mechanical response of fiber-based materials accurately.•The anisotropic plastic response is molded using a non-quadratic yield surface with six subsurfaces for flexibility and accuracy in replicating material response.•The damage evolution utilizes the normalized fracture energy approach derived from experimental observations, accommodating arbitrary uniaxial loading directions.•The model is regularized using the enhanced gradient damage approach utilizing the heat equation solver, ensuring mesh-independent numerical solutions and simplified implementation.•Simulation results demonstrate the model’s effectiveness in predicting anisotropic elastoplasticity with damage in fiber-based materials.