Key Takeaways & Executive Findings
- •• Multi-objective optimization models integrating stiffness, strength, toughness, and dynamic damping were developed for nacre-inspired composites. • NSGA-II algorithm efficiently generated a Pareto front of optimal structural parameters, enabling balanced trade-offs among conflicting mechanical properties. • The optimal solution ranges were validated against real nacre and artificial biomimetic composites, confirming model accuracy. • The proposed method provides a systematic design strategy for fabricating load-bearing bio-inspired materials with tailored performance.
Abstract
Biological load-bearing materials, like the nacre in shells, have a unique staggered structure that supports their superior mechanical properties. Engineers have been encouraged to imitate it to create load-bearing bio-inspired materials which have excellent properties not present in conventional composites. To create such materials with desirable mechanical properties, the optimum structural parameters combination must be selected. Moreover, the optimal design of bio-inspired composites needs to take into account the trade-offs between various mechanical properties. In this paper, multi-objective optimization models were developed using structural parameters as design variables and mechanical properties as optimization objectives, including stiffness, strength, toughness, and dynamic damping. Using the NSGA-II optimization algorithm, a set of optimal solutions were solved. Additionally, three different structures in natural nacre were introduced in order to utilize the better structure when design bio-inspired materials. The range of optimal solutions that obtained using results from previous research were examined and explained why this collection of optimal solution ranges is better. Also, optimal solutions were compared with the structural features and mechanical properties of real nacre and artificial biomimetic composites to validate our models. Finally, the optimum design strategies can be obtained for nacre-like composites. Our research methodically proposes an optimization method for achieving load-bearing bio-inspired materials with excellent properties and creates a set of optimal solutions from which designers can select the one that best suits their preferences, allowing the fabricated materials to demonstrate preferred performance.
1. Introduction
Manufacturing composites that seem to be biomimetic and even more advanced than bio-materials had been long aspired by researchers and engineers [1–4]. Natural biological load-bearing materials, such as shells, teeth, and bones, can exhibit superior and peculiar mechanical properties [5–8]. Artificial bio-inspired composites are manufactured by mimicking the internal micro-structure of natural materials. As preparation process and techniques have developed [9–12], so have many applications for such materials in the aerospace and defense industries [13–15]. Unfortunately, due to the fact that these properties are commonly mutually exclusive, it is challenging to design and create materials with high stiffness, strength, toughness and damping capacity [16–18]. Well-known examples include trade-offs between stiffness and toughness [19], strength and toughness [20], and strength and damping capacity [21, 22].
Stiffness and toughness generally are mutually incompatible, but the unique brick-and-mortar (BM) overlapping structure of nacre in shells can be the reasonable combination for this conflict, where stiffness is attributed to the high content of rigorous minerals (CaCO3, which accounts for 95% vol. of the material) and soft matrix (organic biopolymer made of proteins and polysaccharides) directs cracks leading to increased toughness [23–26]. Although high strength and high toughness are also mutually exclusive [27], nacre can show both high strength and high toughness at the same time. With strength of 100 to 150 MPa, which is near to the yield stress of the mineral under uniform fracture, nacre, for instance, has been found to exhibit fracture toughness that is 3000 times higher than that of the mineral phase [28, 29]. To reduce vibration and impact while retaining structural stability, damping capability is a crucial characteristic [30–33]. Numerous researchers have examined and evaluated the viscous behavior of biological load-bearing materials in recent years, as well as their superior damping capabilities [34–36]. The design is known connection between macroscopic properties and component parameters in the overlapped model should be established to optimize the desired properties of bio-inspired composites [37, 38]. Many studies have been carried out over many years to assess and enhance the synergistic properties of composites that
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Bo Dong, Yunfei Jia, Wei Wang (2025). Designing Load-Bearing Bio-Inspired Materials for Simultaneous Static Properties and Dynamic Damping: Multi-Objective Optimization for Micro-Structure. Chinese Journal of Mechanical Engineering. https://doi.org/10.1186/s10033-024-01169-4
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Frequently Asked Questions
What is the main objective of the research?
The research aims to design load-bearing bio-inspired materials that simultaneously achieve high stiffness, strength, toughness, and dynamic damping by optimizing the micro-structure using multi-objective optimization.
Which optimization algorithm is used?
The Non-dominated Sorting Genetic Algorithm II (NSGA-II) is used to solve the multi-objective optimization problem.
What are the key mechanical properties considered?
The key mechanical properties considered are stiffness, strength, toughness, and dynamic damping.
How are the optimal solutions validated?
The optimal solutions are validated by comparing them with the structural features and mechanical properties of real nacre and artificial biomimetic composites.
What is the significance of this study?
The study provides a systematic optimization method and a set of optimal solutions that designers can use to fabricate bio-inspired materials with tailored performance, addressing the trade-offs among conflicting mechanical properties.
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