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Lv Tiantong,Chen Zipeng,Wang Dengfeng,Du Xuejing 한국CDE학회 2024 Journal of computational design and engineering Vol.11 No.1
Combined application of steel, aluminum, and carbon fiber reinforcement plastic (CFRP) is the main direction of future lightweight body development. However, the anisotropy and additional lamination design variables of CFRP parts pose significant challenges for the development of multi-material bodies. This study establishes a parametric design method for the variable-thickness lamination scheme based on non-uniform rational B-splines, it can be coupled with existing parametric design methods for structural shapes to formulate a complete parametric design and modeling of CFRP components. On this basis, a homogenized intermediate material property is derived from classic laminate theory by introducing lamination assumptions, it enables a stepwise multi-material body optimization method to solve the challenge that components’ material design variables switching between CFRP and alloy will introduce/eliminate lamination design variables iteratively, posing a great optimization convergence difficulty. The proposed parametric modeling method for CFRP components was validated by experimental tests of a fabricated roof beam, and the proposed optimization method was applied to a vehicle body, achieving 15.9%, 23.9%, 18.6%, and 12.2% increase in bending and torsional stiffness and modal frequencies; 20.2%, 9.3%, and 12.7% reduction of weight and peak acceleration in frontal and side collisions. This study enables the forward design of multi-material bodies compatible with CFRP parts.
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Xiongyu Luo,Muxuan Yang,Jinyu Bu,Tiantong Chen,Allen Y. Yi,Weinan Xu 한국고분자학회 2023 Macromolecular Research Vol.31 No.8
The integration of two or more types of metal oxides in the same nanostructures leads to several unique characteristics including tunable optical properties and band gap, enhanced catalytic property and stability. However, current approaches for the generation of those mixed metal oxides are predominantly based on bottom-up synthesis, which have limitations in fabricating precise nanostructures with monodispersed size and shape, and low compatibility with lithography-based micro-/nanofabrication processes. Here, we report a new approach for the precise fabrication of nanostructured mixed metal oxides (NMMOs) by the integration of soft nanoimprinting and sol–gel synthesis. The hybrid ink for nanoimprinting is composed of metal–organic compound and metal oxide colloidal nanoparticles of different metal species, after nanoimprinting, sol–gel reaction, and calcination, NMMOs with well-defined size and geometry are successfully obtained. The morphology, size, composition, and crystalline structure of the NMMOs are systematically tuned and studied, their potential application in photocatalysis is also investigated.
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