Effects of Crack Location on Failure Assessment Curves(FAC)of Propellant Tank Shells
In order to obtain accurate critical crack size 2cc 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 2cc 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.
failure assessment curvepropellant tank shellcrackLBB analysisstructural integrity
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