水下爆炸载荷作用下加肋圆柱壳应变响应研究

采用加肋圆柱壳结构模型模拟潜艇结构,对其在水下爆炸冲击载荷作用下的响应过程进行试验研究。结果表明:采用应变测量的方法对结构进行模态分析是可行的;受附连水质量的影响,加肋圆柱壳结构的低阶湿模态频率较干模态频率显著下降;在爆炸载荷作用下,距离爆炸点越近结构承受的冲击作用越严重,越容易产生塑性破坏;应变的最大响应是冲击波载荷和一次脉动压力载荷共同作用的结果,第二次脉动压力对结构的动态应变响应贡献不明显。

Experimental Study on Stiffened Cylindrical Shell Response to Underwater Explosion Loading

The stiffened cylindrical shell was adopted to simulate submarine structure,and the response to under-water explosion was carried out by experimental test. The result indicates that it is viable to make modal analysis by strain test method. The wet model frequency descends definitely owing to added water mass. Due to the underwater explosion impulse,the nearer to explosion position,it is more easily to form plastic collapse. Both the explosion shock wave and first bubble pulse contribute to the largest strain response,while the later gas bubble impulsive pressure makes little influence.