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Enhancing stiffness and damping characteristics in nacreous composites through functionally graded tablet design
Zhongliang Yu1, Lin Yu1, Junjie Liu2
1College of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China.
Journal of the Mechanical Behavior of Biomedical Materials
|November 22, 2023
Summary
Functionally graded tablets enhance nacreous composites for superior stiffness and damping. This bio-inspired design offers a five-fold increase in damping performance for advanced structural materials.
Area of Science:
- Materials Science
- Composite Materials
- Bio-inspired Engineering
Background:
- Nacreous composites are crucial for structural damping applications demanding high stiffness and damping.
- Existing homogeneous nacreous composites have limitations in achieving simultaneous optimal stiffness and damping.
Purpose of the Study:
- To investigate the enhancement of stiffness and damping in nacreous composites using functionally graded tablets.
- To develop analytical models for predicting the mechanical and damping properties of these advanced composites.
Main Methods:
- Derivation of analytical formulae for loss modulus, storage modulus, and loss factor.
- Validation of formulae through finite element analyses.
- Systematic optimization of parameters including modulus distribution, geometry, and frequency.
Main Results:
- A parabolic modulus distribution in tablets optimizes both strengthening and damping.
- Functionally graded nacreous composites exhibit a five-fold increase in loss modulus compared to homogeneous ones.
- Key parameters like modulus variation degree and overlap length were identified for optimal performance.
Conclusions:
- Functionally graded nacreous composites offer significantly improved damping properties beyond current design limits.
- The developed theoretical model provides a framework for designing high-performance bio-inspired damping composites.
- Integration with 3D printing technology can facilitate the fabrication of these advanced materials.
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