CAJ | 학술논문

针对航空航天领域传统的加筋板结构，提出了一种新型多级加筋板结构形式。首先基于显式动力学方法，数值分析对比了相同质量的单级与多级加筋板在轴压工况下的极限承载能力，结果表明，多级加筋板的极限承载载荷值相较于单级加筋板提高约10％，进而分析了筋高比对完美多级加筋板极限承载能力的影响。以单点凹陷型缺陷为例，对加筋板开展了缺陷敏感度分析，考察了缺陷的幅值与位置对结构承载能力的影响，发现相较于单级加筋板，多级加筋板由于加筋形貌更为丰富，导致其局部抗弯刚度呈现周期性变化，可有效将缺陷诱发的局部失稳抑制在局部区域内，表现出更优异的抗缺陷能力，在此基础上最后分析了筋高比对含缺陷的多级加筋板极限承载能力的影响。
침대항공항천영역전통적가근판결구，제출료일충신형다급가근판결구형식。수선기우현식동역학방법，수치분석대비료상동질량적단급여다급가근판재축압공황하적겁한승재능력，결과표명，다급가근판적겁한승재재하치상교우단급가근판제고약10％，진이분석료근고비대완미다급가근판겁한승재능력적영향。이단점요함형결함위례，대가근판개전료결함민감도분석，고찰료결함적폭치여위치대결구승재능력적영향，발현상교우단급가근판，다급가근판유우가근형모경위봉부，도치기국부항만강도정현주기성변화，가유효장결함유발적국부실은억제재국부구역내，표현출경우이적항결함능력，재차기출상최후분석료근고비대함결함적다급가근판겁한승재능력적영향。
Based on the widely used traditional stiffened panel in the field of aerospace,an innovative hierarchical stiffened pan-el was proposed.By means of dynamic explicit analysis,the ultimate load-carrying capacities of the traditional and hierarchical stiff-ened panels with equivalent mass subjected to axial compression were investigated via the numerical method. Results show that the collapse load of the hierarchical stiffened panel increases approximately by 10%.Meanwhile,the effect of the height ratio of large and small stiffeners on the perfect hierarchical stiffened panel was discussed.The imperfection sensitivities of these two models with var-ying amplitudes and distributions of the single dimple imperfection were studied in detail. It is found that the hierarchical stiffened panel shows low imperfection sensitivity compared to the traditional stiffened panel.This may be attributed to the multiple stiffener si-zes which lead to the periodic distribution of the stiffness of structures,and thus the development of deformations caused by geomet-rical imperfections is restricted to local regions. Finally,the effect of the height ratio of large and small stiffeners on the imperfect hi-erarchical stiffened panel was investigated.