CAJ | 학술논문

在应变强化过程中，容器会发生塑性变形。为了解该变形对于容器外压稳定性的影响，确立了全面考虑强化影响的非线性屈曲分析方法，并选择不圆度作为初始几何缺陷，进行理想容器和含初始不圆度容器在强化前后的屈曲求解，通过比较屈曲载荷、屈曲模态以及载荷位移曲线的变化来探究应变强化过程对容器外压稳定性的影响规律。结果表明，建立的容器模型的屈曲载荷具有很强的不圆度敏感性；含初始不圆度的容器强化后的屈曲载荷提高，外压稳定性增强；应变强化过程可改善容器圆度，提高容器制造过程中壳体初始不圆度的最大允许值。
재응변강화과정중，용기회발생소성변형。위료해해변형대우용기외압은정성적영향，학립료전면고필강화영향적비선성굴곡분석방법，병선택불원도작위초시궤하결함，진행이상용기화함초시불원도용기재강화전후적굴곡구해，통과비교굴곡재하、굴곡모태이급재하위이곡선적변화래탐구응변강화과정대용기외압은정성적영향규률。결과표명，건립적용기모형적굴곡재하구유흔강적불원도민감성；함초시불원도적용기강화후적굴곡재하제고，외압은정성증강；응변강화과정가개선용기원도，제고용기제조과정중각체초시불원도적최대윤허치。
Plastic deformation occurred when vessels were cold-stretched.In order to figure out the influ-ence of the deformation of cold-stretching on stability of vessels under external pressure,this paper estab-lished the nonlinear buckling analysis method which could take all the influence into consideration,chose out of roundness as initial geometric imperfection form of vessels,and performed the buckling analyses of perfect vessels and vessels with initial out-of-roundness before and after the process of cold-stretching,to analyze the influence that the process of cold-stretching brought to the stability of vessels by comparing the change of the buckling load,the buckling mode and the load-displacement curves.The results show that the buckling load of vessels established in this paper are strongly sensitive to out-of-roundness.The buck-ling load of vessels with out-of-roundness increases after cold-stretching.Consequently,the stability of ves-sels under external pressure also increases.Furthermore,the process of cold-stretching can improve the roundness of the vessels and increase the maximum allowable value of out of roundness during the process of producing of manufacturing.