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金属贮箱膜片翻转试验中出现的偏心问题,易造成气液掺混、推进剂泄露等严重后果。为解决膜片的偏心问题,数值计算膜片翻转过程,通过加入弹塑性本构模型引入了显著的数值偏心现象,膜片的最大偏心量约为60mm,且其偏心表现形式与试验中的偏心形式一致性好。提出了改变锥段高度与膜片厚度、环向加筋等方法解决偏心问题,得出了不同方法对数值偏心现象的改善结果。研究表明:增加膜片厚度改善偏心问题效果最好,但同时会显著提高膜片的屈曲载荷与结构质量;改变锥段高度方法次之,但最优锥段高度需根据膜片圆弧旋转段半径进行相应调整;环向加筋方法稍差,但通用性好,且不会显著提高结构质量。
Metal tank diaphragm reversal test of eccentric problems, easy to cause gas-liquid blending, propellant leak and other serious consequences. In order to solve the problem of eccentricity of the diaphragm, numerical calculation of the diaphragm reversal process was carried out. By introducing the elasto-plastic constitutive model, remarkable numerical eccentricity was introduced. The maximum eccentricity of the diaphragm was about 60 mm. The eccentricity of the diaphragm Good form consistency. It is proposed to solve the problem of eccentricity by changing the height of the cone, the thickness of the diaphragm and the circumferential reinforcement. The results of the improvement of numerical eccentricity by different methods are obtained. The results show that increasing the thickness of the diaphragm can improve the eccentricity, but at the same time, the buckling load and the structure quality of the diaphragm will be significantly improved. The method of changing the height of the cone is followed, but the height of the optimal cone needs to be adjusted according to the circular arc of the diaphragm The radius is adjusted accordingly; the ring stiffener method is slightly worse, but the versatility is good, and does not significantly improve the quality of the structure.