应用精细积分的船舶壳体结构塑性损伤计算方法

A precise integral method is used to calculate the plastic damage of ship shell

为分析并计算船舶壳体结构在冲击状态下的塑性损伤情况,以双壳体结构船舶作为试验模型,通过应用精细积分算法精确计算冲击程度,以此为依据,计算船舶壳体结构疲劳损失,并采用MSC/PATRAN有限元模型对试验船舶模型进行模拟,分析并计算船舶壳体结构塑性损伤情况。试验结果显示:该方法可获取精确的冲击力计算结果,为结构的塑性损伤计算提供依据;浪向角会影响冲击影响系数;垂直单向受到冲击,应变达到1.0时,应力值最高,达到210 N左右;船舶底部在爆炸冲击的影响下,其产生的应力从冲击侧开始向另一侧传播,当爆炸冲击距离为10 m时,塑性损伤结果值最大,与实际结果一致。

In order to analyze and calculate the plastic damage of the ship shell structure under the impact state, the double shell structure ship is taken as the test model, and the impact degree is accurately calculated by using the precise integration algorithm. Based on this, the fatigue loss of the ship shell structure is calculated. The msc/Patran finite element model is used to simulate the test ship model, and the plastic damage of the ship shell structure is analyzed and calculated.The test results show that this method can obtain accurate impact force calculation results and provide a basis for plastic damage calculation of structures. The wave direction angle will affect the impact coefficient;When the strain reaches 1.0, the stress value is the highest, reaching about 210 N. Under the influence of explosion impact, the stress generated at the bottom of the ship propagates from the impact side to the other side. When the explosion impact distance is 10 m, the plastic damage result is the largest, which is consistent with the actual result.