鋁合金蜂窩結構動態行為之模擬分析

Study on the Dynamic Behavior of Aluminum Honeycomb Structures

邱崇倫(Chung-Lun Chiu)

指導教授 ： 陳政順

國立臺北科技大學/機電學院/製造科技研究所/碩士(2009年)

摘要

蜂窩結構具有強度高、結構輕及優良的能量吸收性能，隨著一些製造、黏接等關鍵問題的解決，目前已廣泛應用於航空、建築、交通、軍事、包裝等領域。從文獻研究中可得知，蜂窩結構的耐衝擊性能決定在材質以及本身的結構參數。所以探討蜂窩結構參數對耐衝擊性能的影響，就成為本論文的研究內容。
本研究主要利用有限元素分析技術，先對鋁合金5052-H38之蜂窩結構進行模態試驗了解結構參數對動態特性的影響；接著對蜂窩結構進行等速壓縮與衝擊模擬，得到在不同結構參數下的承載強度；最後對蜂窩板進行局部衝擊探討其塑性變形與應力分布。結果顯示：較大的壁厚自然頻率提高且承載強度較大，能在較短衝擊行程吸收較多的能量，達到較佳的緩衝作用；而增加蜂窩結構高度可增加其塑性變形來吸收較多的衝擊能量，對承載強度與自然頻率有一定影響但影響不大，但模態振型會因為高度改變而不同。局部衝擊過程中上蒙皮厚度越大，蜂窩結構所能承受的變形量也就越大，蜂窩板受衝擊的最大變形量也隨著蜂窩板厚度的增加而減少，證明上蒙皮厚度增加能有效增加耐衝性能。

關鍵字

蜂窩結構 ； 有限元素分析 ； 塑性變形

並列摘要

The honeycomb structure with high strength, light structure and good energy absorption properties, it has been widely used in aviation, construction, transportation, military, packaging and other fields, because the manufacturing and connect problems are to resolve. According to the literature of that the honeycomb structure strength mainly depends on the cellular materials, and its structural parameters, it has become focused on the content of this article.
This paper mainly use the finite element method to simulation aluminum alloy 5052-H38 honeycomb structure subjected to high speed crushing and impact loading.The results indicate that increased cell wall thickness of the plate strength will make better the Impact-resistant capacity, and raise the natural frequency. Plate height and mode shape influence each other, and increase the height can improve its plastic deformation to absorb more impact energy. The honeycomb structure can bear the greater deformation, if the greater thickness of above board.

並列關鍵字

Honeycomb Structures ； Finite Element Method ； Plastic Deformation

參考文獻

[1] Tom Bitzer, Honeycomb technology, chapman & hall, 1997, pp.11-13.

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[6] Wierzbicki, T., “Crushing Analysis of Metal Honeycombs,” Int.Impact Engng. pp. 1157-1174, 1983.

[7] Jones,N, ”Structural impact,” Cambridge University Press, 1989.