MANUFACTURING AND VIRTUAL TEST MODEL OF PMI FOAM SANDWICH COMPOSITE STRUCTURES

doi:10.19936/j.cnki.2096-8000.20210428.013

Abstract

Abstract: Due to its high mechanical properties and processing stability, the polyimide foam sandwich structure has been widely used in aerospace. At present, the sandwich structure is mainly manufactured using the prepreg and is cured in the autoclave. This process is relatively high-cost and only provides the surface quality of the die surface. In this paper, a closed-mold liquid molding process is used to manufacture a foam sandwich structure. The simultaneous injection and alternate injection are compared. The results show that alternate injection can obtain better molding quality. In addition, the mechanical properties of the foam were tested. On this basis, the failure model of the foam was established, and its mechanical properties such as three-point bending and lateral compression buckling were carried out by finite element method. These finite element models have been verified by actual experiments and revealed the failure mechanism of the sandwich structure under these loading conditions. The research results can promote the low-cost preparation of high-performance aviation composite sandwich structures and the prediction of structural performance.

Key words: PMI foam, foam sandwich structure, closed-mold RTM, post-buckling, finite element, composites

CLC Number:

TB332

YUAN Chong-xin, DONG Qing-hai, HE Bin. MANUFACTURING AND VIRTUAL TEST MODEL OF PMI FOAM SANDWICH COMPOSITE STRUCTURES[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(4): 89-92.

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