Soft-core sandwich structures subjected to coplanar compression loading might exhibit wrinkling behaviors, which will reduce significantly the support capability of the structure. In order to prevent the wrinkling behaviors of sandwich structures, this work attempts to improve stiffness of face sheets reinforced by carbon nanotubes (CNTs). To achieve such a goal, the following work is to be required. First, an equivalent single-layer model will be proposed to accurately analyze the wrinkling behaviors of sandwich structures because only layerwise models possess the capability to accurately predict wrinkling behaviors of sandwich structures, but these models are often computationally expensive. Second, the influence of distributions of the CNTs through thickness on the buckling and wrinkling behaviors for the sandwich beams will be investigated in detail. Moreover, the translation mechanism between the buckling deformation and the wrinkling deformation has been also explored. The proposed model has been verified by using the quasi three-dimensional (3D) elasticity solutions and the 3D finite-element results (3D-FEM). Third, by selecting the proper distributions of the CNTs through the thickness of sandwich structures, the wrinkling behaviors of sandwich structures can be effectively prevented. Thus, a scheme resisting wrinkling deformation of sandwich structures has been proposed, which can provide a reference for other investigators.

    Sandwich structures are extensively used in many engineering applications due to their high strength to weight ratios and ease of manufacture. However, sandwich structures subjected to in-plane compressive loads might encounter wrinkling failure. In practical applications, this phenomenon is so common, but when it occurs, the sandwich structures will become unstable and cannot withstand higher loads. Therefore, it is crucial to take effective measures to avoid the occurrence of such unfavorable phenomena. To this end, a strategy was presented, where carbon nanotubes are proposed to be added to the face-sheet of sandwich structures. In order to verify the effectiveness of this method, a computational model was also proposed to analyze the wrinkling behaviors. By comparing with the 3D-FEM results of computer simulations, it was proven that the proposed model is correct and effective. In addition, it was found that different volume fractions and distributions of carbon nanotubes have the different influences resisting wrinkling deformation. In practical applications, structural engineers might get some inspirations to avoid the instability of sandwich structures from the research results of this paper.


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    Title :

    Buckling and Wrinkling of Sandwich Structures Reinforced by Functionally Graded Carbon Nanotubes


    Additional title:

    J. Aerosp. Eng.


    Contributors:
    Wu, Zhen (author) / Zhang, Senlin (author) / Xiao, Yushan (author) / Liu, Zhengliang (author) / Ren, Xiaohui (author)

    Published in:

    Publication date :

    2023-03-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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