摘要
本文基于近似屈服准则和理想刚塑性理论,推导出四棱台形冲头撞击下船用矩形夹芯板变形和冲击力理论解析公式,还开展了数值计算,以验证理论模型的准确性。在此基础上,采用理论模型分析了载荷分布情况、载荷作用位置以及边长比对船用矩形夹芯板冲击动态响应的影响规律。结果表明,四棱台形冲头撞击下,船用矩形夹芯板动态响应理论预测结果与数值计算结果吻合较好。载荷分布系数增加时,单位面积冲击载荷作用强度减小,导致塑性变形减小;冲击载荷作用位置越靠近边界时,塑性铰线长度增加,导致结构塑性变形显著减小;当泡沫夹芯板边长比为1时,冲击载荷作用下结构塑性变形最严重。
In this paper,a theoretical formula of plastic deformation and impact force of rectangular lightweight sandwich plate struck by a rectangular frustum impactor was derived based on the approximate yield criterion and rigid-perfectly plastic theory.Numerical simulations were conducted to verify the accuracy of the analytical prediction model.In addition,the influences of load distribution,side length ratio and location of impact loads on the dynamic response of a rectangular sandwich plate were theoretically analyzed.Results show that the theoretical predictions for PVC foam core sandwich plate struck by a rectangular frustum impactor show good agreement with numerical results.With the increase of load distribution coefficient,the impact strength per unit area decreases,which leads to the decrease in plastic deformation;when the impact position is closer to the boundary,the length of plastic hinges increases,resulting in a significant decrease in deformation;the plastic deformation achieves its most significant value under impact when the aspect ratio of foam sandwich plate is 1.
作者
肖雯
李应刚
胡勇
宋泽远
刘虎
李晓彬
XIAO Wen;LI Ying-gang;HU Yong;SONG Ze-yuan;LIU Hu;LI Xiao-bin(Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)
出处
《船舶力学》
北大核心
2025年第10期1629-1637,共9页
Journal of Ship Mechanics
基金
国家自然科学基金项目(11972269)
湖北省自然科学基金项目(2019CFB566)。
关键词
船用矩形夹芯结构
冲击载荷
理论模型
动态响应
数值验证
rectangular sandwich plate
impact load
analytical model
dynamic responses
numerical validation
