为了快速获得带加强环金属壳体在结构质量及外压载荷双重约束条件下加强环的设计值,本文首先基于某壳体外压载荷试验结果,校正了缺陷因子这一非线性屈曲分析中的关键参数,对比仿真计算与试验结果发现,以载荷-位移曲线的线性段终止处作为失稳判据,缺陷因子取0.02时的计算结果与试验值吻合较好,且若采用线性屈曲结果预示带加强环金属壳体的失稳载荷,试验修正系数可取0.72。之后,应用特征值屈曲分析及响应面优化等有限元分析手段,提出了一种高效的优化设计方法,通过建立参数化壳体几何模型,以加强环的厚度及宽度为设计变量、几何模型的结构质量和一阶线性屈曲特征值为目标参数,反向优化设计,获取满足目标约束的加强环结构尺寸设计值,为提高壳体的抗失稳能力提供了明确的加强措施,提高了设计效率。

In order to obtain the design values of the strengthening ring for metal shells of solid rocket motor with strengthening rings under Double constraint conditions of mass and external pressure load,First of all,the defect factor was corrected which was a key parameter in nonlinear buckling analysis,and the analysis result showed that the calculated result was matched better with the test result when the defect factor was 0.02,while the linear section of the load-displacement curve was taken as the the critical criterion point of instability by comparing the simulation result with the test result.In the meantime,the experimental correction coefficient was obtained for buckling eigenvalue based on the results of external pressure load tests.If the linear buckling results was used to predict the Critical instability load of metal shells with strengthening rings of solid rocket motor,the test correction coefficient was suggested to be 0.72.Then,Based on simulation software,an efficient optimization design method was proposed using finite element analysis methods such as eigenvalue buckling and response surface optimization which provided clear strengthening measures and improved design efficiency by establishing a parameterized geometric model of the ring-stiffened metal shell,during the design optimization,the thickness and width of the strengthening ring was independent variables,and the structural quality and first-order linear buckling eigenvalue was target parameters,the design values of strengthening ring were obtained that meet the target constraints.