嵌板受水下爆炸衝擊的非線性動態反應

Non - Linear Dynamic Response of Submerged Plate Subjected to Underwater Explosion

洪振發(C. F. Hung) ； 徐培譽(P. Y. Hsu)

《中國造船暨輪機工程學刊》 22卷4期 (2003/11) Pp. 201-212

https://doi.org/10.29982/JTSNAME.200311.0005

摘要

本文探討水面下以空氣為背壓的平板，受到不同爆震因數的水下爆炸衝擊產生的彈塑性暫態反應(transient response)。爆震因數範圍涵蓋使平板產生彈性變形到塑性損壞的狀況。數值分析考慮應變率對材料非線性變形的影響。研究對象以Ramajecyathilagam[1]的試驗模型為主，目標板為0.55m×0.45m×0.004m的平板，四周以厚板加強並以螺栓鎖定於中空的厚鋼板支撐箱，目標板未被厚板加強部分為0.30m×0.25m×0.004m。
本文數值分析工具採用USA+DYNA3D，分別就只考慮無加強部分的方板與完整目標板模型、主爆震波衝擊外有無考慮氣泡脈衝次衝擊以及有無考慮流固耦合等不同狀況進行板結構的彈塑性暫態反應分析，計算結果與[1]的試驗結果做比較，檢討分析過程採用的目標板有效範圍、邊界條件、應變率與爆震波衝擊負荷等模型的合理性。

關鍵字

嵌板 ； 彈塑性暫態反應 ； 水下爆炸 ； 應變率 ； 有限元素法

並列摘要

In this paper, the elasto-plastic transient dynamic response of the air-backed plate panel subjected to shock loading of underwater explosion has been examined. The study case focuses on the experimental model of Ramajeyathilagam [1]. The target plate has the size of 0.55m×0.45m×0.004m, whose four edges are supported by
thick plates and mounted on rigid steel casting with bolt, the unsupported area of the target plate is 0.30m×0.25m. The
dynamic responses of the target plate are examined under different level of shock factors, which cover the range from elastic deformation to plastic failure of plate. The effect of strain rate on the dynamic response during the material nonlinear phase is taken into consideration. The numerical analysis was carried out by the USA+DYNA3D codes.The analysis results are compared with the experiment accomplished by Ramajeyathilagam [1]. The reasonable
model of finite element analysis, boundary condition and the shock loading are examined.

並列關鍵字

Plate Panel ； Elasto-Plastic Transient Response ； Underwater Explosion ； Strain Rate ； FEM