Design And Preparation Of Bioinspired Structural Materials Based On Finite Element Analysis

Along with the development of nanotechnology and bionics,related researchers have prepared a variety of lightweight and high-strength bioinspired structural materials.Although significant progress has been made in the research related to bioinspired structural composites,there is still a considerable distance from industrial applications.The development of precise,efficient,parametric,and fine-grained bioinspired micro structure regulation strategies is one of the most important ways to address the industrialization of lightweight,high-strength bioinspired structures.This thesis begins with a review of recent hotspot natural materials with multiscale structures and bioinspired fabrication methods,focusing on the multiscale mechanical structural materials prepared by bidirectional freezing and 3D printing techniques,and their common computational characterization methods are also described.Based on this,we aim to optimize bioinspired materials and fabrication methods through finite element characterization techniques in order to achieve universal,economically feasible,scale,and parametric production,which provides some reference and guidance for the practical application of high-performance bioinspired structural materials.The main research results obtained are as follows.1.Traditional bidirectional freezing process was optimized.It is determined more suitable bidirectional freezing conditions for the preparation of more regular laminar structures via simulation and optimization of temperature gradients.A new method for preparing microscopically bent laminar structures was developed to adjust the microscopic topography of the freezing assembly by changing the geometry of the freezing device and then the temperature field of the freezing device,and finally to prepare microscopically bent laminar structure materials.Immediately following the comparison of several key parameters affecting the freezing device,the effects of these parameters are systematically studied in order to optimize the prepared microstructure of assemblies.2.The effects of different parameters of a bio inspired impact-resistant structure were investigated for the preparation of Bouligand structure ceramics by fused deposition 3D printing.Impact tests of different structures were performed on a drop-weight tester.Impact tests are combined with finite element modeling to enhance our understanding of the potential mechanisms that occur during impact.Our experimental and simulation results show that Bouligand structural ceramic have excellent impact resistance,energy-absorbing properties.This study shows that emerging 3D printing technologies can enable additive designs with optimal impact-resistant energy-absorbing structures,and finite element analysis can enhance the understanding of the mechanical behavior of materials during impact damage.