材料力学特性对球型耐压结构极限强度的影响

为了揭示材料主要力学性能对深海耐压结构极限承载能力的影响规律，本文以完整球壳为研究对象，采用非线性有限元方法，开展了材料力学特性变化对极限强度的影响研究。通过大量数值计算与归纳分析，得到了材料屈服强度和杨氏模量随厚径比变化对球壳极限强度的影响规律，研究发现随着厚径比的增加，材料刚度特性对结构极限强度的影响权重逐渐减少，屈服强度影响权重逐渐增加，在此研究基础上本文提出了一种考虑屈服强度变化的球壳极限强度计算新方法，为潜水器耐压结构选材与设计提供参考。

Research on the influence of mechanical properties of materials for the ultimate strength of spherical shell

in order to reveal the influence rule between the mechanical properties and ultimate strength, nonlinear finite element method is adopted to analyse the ultimate strength of spherical shell with the variety of mechanical properties of materials in this paper. A lot of numerical calculation is submitted and analysed, and the influence rule of yield strength and Young modulus varied with thickness diameter ratio for the ultimate strength of spherical shell is obtained. It was found out that the influence weight of material stiffness characteristics on the ultimate strength of the pressure hull decreases, in contrast,the influence weight of yield strength increases. A new computing method on the ultimate strength of spherical shell is proposed, which takes the variety of the yield strength into account. This can provide guidance for the determination on the material for pressure hull and the design for pressure hull of submersible.