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<p>Understanding the mechanical behavior of hemoglobin–marine sediment (HESM) biocomposites is crucial for their development as sustainable structural materials. This study proposes a modified Drucker–Prager (MDP) model specifically tailored for HESM, simultaneously capturing tension–compression (TC) asymmetry, pressure sensitivity, and strain rate effects. The formulation incorporates a strain-dependent hardening law and a novel stress-directional term to represent the strength differential effect, rarely addressed in biocomposite modeling. Implemented in a fully 3D elastoplastic framework with an implicit stress update algorithm, the model is coded in ABAQUS via a UMAT subroutine. A viscoplastic extension is also included to describe dynamic loading behavior. Validation against experimental data confirms the pronounced TC asymmetry of HESM and shows that the MDP significantly outperforms the classical Drucker–Prager model, reducing tensile–compressive prediction errors. The approach accurately reproduces mechanical responses in both monotonic and rate-dependent loading conditions thereby providing a strong validation of the model. Application to simulate three-point bending tests for various marine sediment contents demonstrates the model’s capability to guide the design of pressure-sensitive, biodegradable composite structures.</p>

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Constitutive modeling of the viscoplasticity and tension–compression asymmetry behavior of HESM biocomposites

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • I. Zarrad,
  • H. Mallek,
  • M. Allouch,
  • H. Mellouli,
  • F. Dammak

摘要

Understanding the mechanical behavior of hemoglobin–marine sediment (HESM) biocomposites is crucial for their development as sustainable structural materials. This study proposes a modified Drucker–Prager (MDP) model specifically tailored for HESM, simultaneously capturing tension–compression (TC) asymmetry, pressure sensitivity, and strain rate effects. The formulation incorporates a strain-dependent hardening law and a novel stress-directional term to represent the strength differential effect, rarely addressed in biocomposite modeling. Implemented in a fully 3D elastoplastic framework with an implicit stress update algorithm, the model is coded in ABAQUS via a UMAT subroutine. A viscoplastic extension is also included to describe dynamic loading behavior. Validation against experimental data confirms the pronounced TC asymmetry of HESM and shows that the MDP significantly outperforms the classical Drucker–Prager model, reducing tensile–compressive prediction errors. The approach accurately reproduces mechanical responses in both monotonic and rate-dependent loading conditions thereby providing a strong validation of the model. Application to simulate three-point bending tests for various marine sediment contents demonstrates the model’s capability to guide the design of pressure-sensitive, biodegradable composite structures.