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A Meso-Scale Computational Framework for Predicting Fracture Mechanisms in 3D-Printed Bouligand Cementitious
Xuelian Yuan1, Yaqing Jiang1, Huiting Xiong1
1School of Civil Engineering, Wanjiang University of Technology, Ma'anshan 243031, China.
Materials (Basel, Switzerland)
|July 15, 2026
Summary
Researchers developed 3D printed concrete with Bouligand structures to enhance toughness. The 15° architecture significantly increased energy absorption, showing a promising geometry-driven approach for damage-tolerant cementitious composites.
Area of Science:
- Materials Science
- Civil Engineering
- Additive Manufacturing
Background:
- Cementitious materials exhibit inherent brittleness, limiting their use in advanced structural applications.
- Bio-inspired Bouligand architectures in natural composites show remarkable damage tolerance.
- Translating Bouligand architectures to 3D concrete printing (3DCP) and modeling their performance is underexplored.
Purpose of the Study:
- To decouple the toughening potential of helicoidal Bouligand architectures from additive manufacturing defects using a meso-scale finite element (FE) framework.
- To computationally and experimentally validate the performance of 3D printed Bouligand architectures in cementitious composites.
- To explore the design space for optimal strength-toughness balance in these materials.
Main Methods:
- Developed a meso-scale FE framework integrating the concrete damaged plasticity (CDP) model with 3D cohesive zone elements.
- Utilized a nano-clay-assisted rheological strategy for support-free 3DCP of helicoidal prototypes.
- Performed coupled physical compression tests and numerical simulations to analyze crack kinematics and material performance.
Main Results:
- The 15° Bouligand architecture demonstrated a 16.3-fold increase in volumetric energy absorption (computationally) and a 13.7-fold increase (experimentally) compared to a 0° baseline.
- A modest ~11% reduction in compressive strength was observed for the 15° architecture.
- Numerical studies identified an optimal pitch-angle window of 15-30° for balancing crack deflection and structural integrity.
- The topological toughening mechanism proved robust, maintaining significantly higher work of fracture even with reduced inter-filament bonding.
Conclusions:
- Spatial toolpath programming via Bouligand architectures is a viable geometry-driven strategy for enhancing damage tolerance in cementitious composites.
- This approach complements traditional material-level reinforcement methods.
- The study provides a high-fidelity meso-scale modeling framework for quantitatively mapping the strength-toughness design space.
