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A Bioinspired Design of Protective Al2O3/Polyurethane Hierarchical Composite Film Through Layer-By-Layer Deposition
Jiaming Zhong1, Zhixiong Wen1, Yibo Wu2
1State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Researchers developed a nacre-inspired composite using ceramic and polyurethane to enhance energy absorption and impact resistance in structural materials. This biomimetic design significantly outperforms traditional polyurethane foams, offering superior protection for materials like CFRP.
Area of Science:
- Materials Science and Engineering
- Biomimetics and Bio-inspired Design
Background:
- Structural materials (ceramics, metals, CFRP) are vulnerable to compressive and impact forces.
- Current energy absorption foams (polyurethane, silicone) have limited energy dissipation and penetration resistance.
- Need for advanced materials with improved impact protection and energy absorption capabilities.
Purpose of the Study:
- To propose a novel nacre-like architecture design strategy for enhanced energy absorption and impact resistance.
- To integrate hard porous ceramic frameworks with flexible polyurethane buffers.
- To evaluate the performance of the bioinspired composite compared to conventional polyurethane foams.
Main Methods:
- Fabrication of a bioinspired composite material mimicking nacre's structure.
- Integration of hard porous ceramic frameworks and flexible polyurethane buffers.
- Experimental investigation of mechanical properties (hardness, strength, modulus) and energy absorption under quasi-static and impact loading.
Main Results:
- The bioinspired composite exhibited superior hardness, strength, and modulus compared to polyurethane.
- Normalized absorbed energy was approximately 20 times higher than polyurethane foams under quasi-static compression (≈8.557 MJ m⁻³).
- Bioinspired composites provided superior impact protection for CFRP, glass, and steel, with CFRP withstanding over ten 10 J impacts without damage.
Conclusions:
- The nacre-like architecture design strategy effectively enhances energy absorption and impact resistance.
- Bioinspired composites offer a significant improvement over conventional polyurethane foams for protecting structural materials.
- This biomimetic approach provides valuable insights for developing lightweight, energy-absorbent, and impact-resistant materials.
