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基于弹性力学理论,获得了内压和侧向外载共同作用下燃料舱结构整体变形与内压之间变化关系的解析解,并进行了有限元分析验证和燃料舱静力试验验证。结果表明:内压对结构整体侧向变形有一定的影响,通过增大内压来减小侧向变形需要圆筒材料的轴向与环向弹性模量、泊松比之间满足一定的关系条件;内压对弹性模量小、截面惯性矩小的燃料舱结构的整体变形影响较为显著,但对弹性模量较大、截面惯性矩较大的结构可挖掘潜力较小。燃料舱静力试验结果表明:当结构的弹性模量和泊松比不满足一定关系时,有内压下的结构整体变形大于无内压下的。
Based on the theory of elasticity, the analytic solution of the relationship between the overall deformation of the fuel tank structure and the internal pressure under the combined action of internal pressure and lateral external load was obtained. The finite element analysis and the verification of the fuel tank static test were carried out. The results show that the internal pressure has a certain influence on the overall lateral deformation of the structure. The axial and circumferential elastic moduli of the cylindrical material are required to reduce the lateral deformation by increasing the internal pressure, and the Poisson’s ratio satisfies a certain relationship The internal pressure has a significant effect on the overall deformation of the fuel tank structure with small elastic modulus and small moment of inertia. However, the structure with larger elastic modulus and larger moment of inertia has less potential for excavation. The results of the static test of the fuel tank show that when the elastic modulus and the Poisson’s ratio of the structure do not satisfy a certain relationship, the overall deformation under the internal pressure is greater than that under the internal pressure.