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复合材料泡沫夹层结构在飞机结构上的应用日益广泛,面板与芯子的全厚度缝合是提高泡沫夹层结构层间剪切性能的重要途径。本文通过层间剪切试验,研究不同缝合密度下单向带面板和织物面板复合材料泡沫夹层结构的层间剪切强度及其变化规律。研究结果表明:面板为单向带的缝合泡沫夹层结构最大剪切载荷和层间剪切强度均优于未缝合泡沫夹层结构的,且层间剪切性能随着缝合密度的增加而增加;面板为织物的缝合泡沫夹层结构缝合密度超过4000针/m2左右后,最大剪切载荷和层间剪切强度均优于未缝合泡沫夹层结构,且层间剪切性能随着缝合密度的增加而增加。
The application of composite foam sandwich structure in aircraft structures is becoming more and more widespread. The full thickness of the panel and the core is an important way to improve the shear properties of foam sandwich structures. In this paper, interlaminar shear tests were conducted to study the interlaminar shear strength and its variation of foam sandwich structure with unidirectional tape and fabric panels under different stitching densities. The results show that the maximum shear load and interlaminar shear strength of stitched foam sandwich with one-way belt are superior to that of un-stitched foam sandwich, and the interlaminar shear properties increase with the increase of stitching density. The maximum shear load and the interlaminar shear strength of the stitched foam sandwich structure are better than that of the un-stitched foam sandwich structure when the stitched density of the stitched foam sandwich structure is over 4000 needles / m2, and the interlaminar shear properties increase with the increase of the stitched density .