CAJ | 학술논문

对于加筋柱壳等薄壁结构，轴压承载力对不同结构形式表现出不同的缺陷敏感性，寻找低缺陷敏感度的结构设计形式具有重要的研究意义。首先以分别发生弹性和塑性屈曲的两个直径3m的正交加筋柱壳为例，研究了不同幅度双曲母线形状对两者承载力的影响，发现双曲母线外凸和内凹会分别提高两种加筋柱壳的轴压承载力。然后以特征值屈曲模态和单点凹坑两种缺陷为例，对具有不同幅度双曲母线的加筋柱壳开展了缺陷敏感性分析。结果表明，对于两种加筋柱壳结构均可以通过适当幅度的外凸双曲母线形状降低缺陷敏感性，为提高运载火箭加筋柱壳的可靠性储备提供了一种易实现的结构方案。
대우가근주각등박벽결구，축압승재력대불동결구형식표현출불동적결함민감성，심조저결함민감도적결구설계형식구유중요적연구의의。수선이분별발생탄성화소성굴곡적량개직경3m적정교가근주각위례，연구료불동폭도쌍곡모선형상대량자승재력적영향，발현쌍곡모선외철화내요회분별제고량충가근주각적축압승재력。연후이특정치굴곡모태화단점요갱량충결함위례，대구유불동폭도쌍곡모선적가근주각개전료결함민감성분석。결과표명，대우량충가근주각결구균가이통과괄당폭도적외철쌍곡모선형상강저결함민감성，위제고운재화전가근주각적가고성저비제공료일충역실현적결구방안。
For thin-walled structures , such as stiffened shells , collapse loads show different imperfection sensitivities , and this enhances the significance of finding the designs with low imperfection sensitivities .Based on two orthogrid stiffened shells with a diameter of 3 m (elastic and plastic buckling , respectively ) , the effects of amplitudes of hyperbolic generatrix shapes on the collapse loads of two models are firstly investigated . It is found that the outward and inward hyperbolic generatrix shapes can increase the collapse loads of two models .Then ,the imperfection sensitivities of two models with varying amplitudes of hyperbolic generatrix shapes are studied in detail based on eigenmode-shape and single dimple imperfections .Experimental results indicate that the outward hyperbolic generatrix shapes are capable of reducing the imperfection sensitivities of two types of stiffened shells ,w hich are expected to provide a realistic design ,aiming at increasing the reliability margin for stiffened shells in launch vehicles .