大冲击条件下水下航行体结构失效机理研究  

Fracture failure mechanism analysis of underwater vehicle structures under large impact

作　　者：孙卓 SUN Zhuo(China Ship Research and Development Academy,Beijing 100101,China)

机构地区：[1]中国舰船研究院,北京100101

出　　处：《舰船科学技术》2024年第24期10-14,共5页Ship Science and Technology

基　　金：国家自然科学基金面上资助项目(52371356)。

摘　　要：本文针对某航行体减阻装置在大冲击条件下的疲劳断裂问题开展研究。首先采用理论和仿真方法,分析减阻结构周围的流体压强分布规律,获取减阻结构转动力矩的变化特征,在此基础上对减阻结构在冲击载荷下张开过程的应力分布特性进行分析并校核结构强度;基于电镜检测方法研究失效部位的微观断裂特征,得到断裂缺口微观形貌特征,建立宏观损伤特征与微观断裂的关联,最终确定断裂失效的主要因素。本文提出的基于多尺度法对结构断裂失效进行分析,为结构安全评估提供了一种新思路。This paper conducts research on the fatigue fracture issue of a drag reduction device for a certain vehicle under conditions of high impact.Initially,a theoretical plus simulation approach is utilized to analyze the distribution pattern of fluid pressure around the drag reduction structure,thereby characterizing the variation in the torque of the drag reduction structure.Based on this,an analysis is conducted on the stress distribution characteristics of the drag reduction structure during the deployment process under impact loading,and the structural strength is verified.Employing electron microscopy for inspection,the micro-fracture characteristics of the failed area are studied to ascertain the micro-morphological features of the fracture notch.A correlation is established between macroscopic damage characteristics and micro-fracture.Ultimately,the primary causes of fracture failure are identified.The paper proposes a multi-scale method for analyzing structural fracture failure,offering a novel perspective for structural safety assessment.

关 键 词：多尺度方法 宏观损伤 微观断裂 安全评估 

分 类 号：U668.2[交通运输工程—船舶及航道工程]