某海上发射平台导流槽在高温冲击下裂纹扩展的XFEM模拟  

XFEM Simulation of Crack Propagation in the Deflector Channel of an Offshore Launch Platform under High-temperature and Impact

作　　者：林瞳 李福建[1] 刘光众 熊志鑫 LIN Tong;LI Fu-jian;LIU Guang-zhong;XIONG Zhi-xin(Marine Design&Research Institute of China,Shanghai 200011,China;College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011 [2]上海海事大学海洋科学与工程学院,上海201306

出　　处：《船海工程》2025年第1期153-159,共7页Ship & Ocean Engineering

基　　金：国家自然科学基金(51909153)。

摘　　要：发射平台导流槽在火箭发射过程中承受着燃气高温和局部冲击力的作用,容易出现局部裂纹扩展导致的断裂失效,影响火箭的安全发射。文中采用扩展有限元法(XFEM),对含初始裂纹的导流槽结构进行数值模拟分析。在ABAQUS软件平台上建立导流槽的有限元模型,施加高温与冲击荷载,选定受冲击的下表面上易发生裂纹扩展的3个热点位置;对于易发生裂纹扩展的热点位置的板架采用体单元模拟,其余部位采用壳单元模拟,通过多点约束耦合不同单元的节点自由度,从而建立含裂纹导流槽的扩展有限元模型;采用最大主应力准则作为裂纹起裂准则,得出各热点位置处在单次冲击荷载作用下,会发生裂纹扩展的初始裂纹长度,裂纹起裂的时间、扩展速率及扩展路径。During the rocket launch process,the deflector’s flow channel is subjected to high-temperature gases and local impact forces,which can lead to local crack propagation and fracture failure,impacting the safe launch of the rocket.The extended finite element method(XFEM)was applied to numerically simulate the flow channel structure with initial cracks.A finite element model of the flow channel was established in Abaqus software;the high-temperature and impact loads were applied,and three hotspots on the lower surface prone to crack propagation due to impact were selected.The solid elements were used to simulate the hotspot regions prone to crack propagation,while shell elements were used for the rest of the structure.Multiple point constraints were applied to couple the node degrees of freedom between different elements,thus creating an XFEM model for the flow channel with cracks.Using the maximum principal stress criterion as the crack initiation criterion,the initial crack length at each hotspot location under a single impact load,the time of crack initiation,crack propagation rate,and propagation path were determined.

关 键 词：XFEM 导流槽 高温冲击 裂纹扩展 发射平台 

分 类 号：U661.4[交通运输工程—船舶及航道工程]