摘要
为获取准确的临界裂纹尺寸2c_(c)以实现可重复使用推进剂贮箱LBB设计及评定,构建了2种裂纹类型5组典型裂纹位置的贮箱壳体失效评定曲线(FAC),并分析了裂纹位置对FAC的影响。结果表明:随着裂纹从圆柱段中心向封头移动(y的增加),2种裂纹类型壳体极限载荷PL均先保持不变,再显著增加,最后小幅增加,FAC总体上逐渐升高,壳体的安全性增加。工程上采用选择1和选择2曲线确定的临界裂纹尺寸2c_(c)仅能对极少数的载荷工况下特定裂纹位置的贮箱壳体进行准确的LBB分析。建立裂纹位置相关的FAC,可以提高贮箱壳体的结构完整性。
In order to obtain accurate critical crack size 2c_(c)to realize the LBB design and evaluation of reusable propellant tank,the failure assessment curves(FAC)of cracks with two types and five typical locations were constructed,and the effects of crack location on the FAC were analyzed.The results showed that with the crack moving from the center of the cylinder to the head(y increases),the limit load PL of the shells with two crack types remained unchanged firstly,then increased signif⁃icantly and finally increased slightly;The FAC gradually increased,and the safety of the shell in⁃creased.At present,the critical crack size 2c_(c) determined by Choice 1 and Choice 2 curves in engi⁃neering can only accurately analyze the specific crack location of the tank shells under a few load conditions.In order to improve the structural integrity of the tank shell,it is necessary to establish a FAC related to the crack location.
作者
范凯
韩冲
FAN Kai;HAN Chong(Shanghai Institute of Space Propulsion,Shanghai 201112,China;Shanghai Engineering Center of Space Engine,Shanghai 201112,China)
出处
《载人航天》
CSCD
北大核心
2024年第4期486-494,共9页
Manned Spaceflight
基金
上海市“科技创新计划”启明星培育(扬帆专项)项目(22YF1429400)。
