自由落体作用下不同刚度楔形体板架结构响应特性的仿真及试验研究

Simulation and Experimental Study of Structural Responses of Wedge Grillages with Different Stiffness under Free Drop

目的分析艏部板架结构在砰击载荷作用下的极限承载能力。方法将艏部简化成二维楔形体板架形式,并基于ALE流固耦合对具有2种不同加筋刚度的楔形体板架的砰击响应开展数值仿真分析,预报不同位置的砰击压力和结构塑性变形的变化规律。为验证数值仿真结果的准确性,分别对角钢和T形材这2种加筋板结构开展自由落体砰击试验。结果数值仿真结果与试验测量结果吻合较好。其中,试验与仿真的塑性应变最大误差的测点发生在加强筋的面板和腹板,分别为17.06%以内和17.50%。此外,在相同砰击载荷的情况下,2个模型的应变量值都在相同的数量级中。结论无论是试验结果还是仿真结果,带T形材加筋板的结构响应更大,这说明砰击载荷作用下T形材抵抗变形的能力要比角钢更强。

To analyze the ultimate bearing capacity of the ship bow under the slamming loads,the bow was simplified to a 2D wedge grillage.Based on the Arbitrary Lagrangian-Eulerian(ALE)fluid structure coupling method,a numerical simulation was carried out for the slamming responses of wedge grillages with two kinds of stiffness,and the variation law of slamming pressure and structural plastic deformation at different positions were predicted.To verify the accuracy of the numerical simulation,free-drop tests were conducted on two types of stiffened plates with angle steel and T-profile,respectively.It was shown that the numerical simulation results were in good agreement with the experimental results.The measuring points with the maximum error of plastic strain between experiments and simulations occurred at the panels and web plates of stiffened plates,which was within 17.06%and 17.50%,respectively.Furthermore,under the same slamming loads,the strain values of both models were in the same order of magnitude.Both experimental and simulation results show that the structural response of the stiffened plate with T-profile are greater.This indicates that the ability of T-profile to resist deformation under slamming loads is stronger than that of angle steel.