单双壳体典型结构耐撞特性模型试验研究及仿真分析

基于单双壳体典型结构特征,以总重量相近为基础,分别设计单双壳体结构缩比试验模型,针对单壳和有舷间水双壳模型状态,以230kg球形撞击体,初速7.8m/s侧向撞击为载荷工况,开展单双壳体典型结构耐撞特性模型试验研究。通过对撞击后结构模型的损伤状态及相关参量的观测,试验结果显示,单双壳体结构撞击载荷作用下结构的失效及破坏模式存在较大差异;进一步结合高瞬态非线性有限元程序MSC/Dytran对模型试验过程中的结构动态响应特性以及构件吸能分布特性开展深入分析,研究结果显示:不考虑外壳外部附连水影响时,由于舷间水和结构构件分散的影响,双壳结构的撞击载荷过程延长,冲击载荷峰值低于单壳结构,但耐压壳体撞击形变区域相对集中,凸起明显;单壳结构撞击形变影响区域较大,撞击力作用时间短,冲击载荷峰值较高。通过综合分析单双壳结构撞击力历程特征曲线、构件塑性变形能分布规律特性分析,可以认为随着撞击强度的不断增加,单壳结构的剩余强度将趋近于双壳结构耐压壳体。

Experimental and numerical research for impact-resistance characteristic of double or single shell structure in water

The model test of single/double-hulled structure with ring-stiffened cylindrical shell is designed,based on the typical features of single/double structure and the similar total weight.For the model state of single hull without water and double hull with water between the two hulls,the experimental studies on collision-model test of the typically single/double-hulled structure by using lateral collision of the spherical impactor with the weight 230 kg and the initial velocity 7.89 m/s as load case were carr...