Buckling Performance of Variable Stiffness Laminates Under Delamination Damage

IF 2.9 4区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Applied Composite Materials Pub Date : 2025-03-21 DOI:10.1007/s10443-025-10322-8

C. J. Song, X. J. Niu, X. Zhang

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Abstract

Laminated components inevitably incur micro-damages during preparation, transportation, and assembly, compromising their structural stability. The variable stiffness (VS) layup design method broadens the design possibilities for FRP structures and diminishes their susceptibility to internal micro-damages. This study investigates the progressive buckling performance of a Fiber reinforced polymer (FRP) plate under uniaxial compression with pre-set delamination damages of varying sizes (D = 15 mm, D = 20 mm, D = 25 mm) and without damage. The impact of design parameters of VS plies on buckling behavior is characterized, and an analytical relationship between them is developed by taking the aspect ratio of plates into account. Post-buckling responses were experimentally studied and captured using a digital image correlation (DIC) system. The optimized VS laminated plate shows a 41.1% increase in buckling stiffness and a 113.58% increase in ultimate load capacity over conventional stiffness (CS) specimens. The study concludes that larger delamination sizes reduce the ultimate load capacity of FRP laminates. To enhance the buckling resistance and damage tolerance of VS laminates, thereby improving their structural stability, this study introduces an innovative analytical algorithm for optimizing the layup configuration. This algorithm allows for a quantitative analysis of how different design variables impact the laminate's performance. Furthermore, to validate the accuracy of our analytical approach, we employ a DIC system in our experiments to confirm the post-buckling responses.

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分层损伤下变刚度层合板的屈曲性能

复合材料在制备、运输和组装过程中不可避免地会产生微损伤，从而影响其结构稳定性。变刚度铺层设计方法拓宽了FRP结构的设计可能性，降低了其对内部微损伤的敏感性。本研究研究了纤维增强聚合物（FRP）板在单轴压缩下具有不同尺寸的分层损伤（D = 15 mm, D = 20 mm, D = 25 mm）和无损伤的渐进式屈曲性能。分析了VS层设计参数对屈曲行为的影响，并在考虑板长径比的情况下建立了VS层设计参数与屈曲行为之间的解析关系。利用数字图像相关（DIC）系统对后屈曲响应进行了实验研究和捕获。优化后的VS层合板屈曲刚度比常规刚度（CS）试件提高41.1%，极限承载能力提高113.58%。研究表明，分层尺寸越大，玻璃钢层合板的极限承载能力越低。为了提高VS层压板的抗屈曲能力和损伤容限，从而提高其结构稳定性，本研究引入了一种创新的优化叠层结构的解析算法。该算法允许定量分析不同的设计变量如何影响层压板的性能。此外，为了验证我们的分析方法的准确性，我们在实验中使用DIC系统来确认屈曲后的响应。

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来源期刊

Applied Composite Materials 工程技术-材料科学：复合

CiteScore

4.20

自引率

4.30%

发文量

审稿时长

1.6 months

期刊介绍： Applied Composite Materials is an international journal dedicated to the publication of original full-length papers, review articles and short communications of the highest quality that advance the development and application of engineering composite materials. Its articles identify problems that limit the performance and reliability of the composite material and composite part; and propose solutions that lead to innovation in design and the successful exploitation and commercialization of composite materials across the widest spectrum of engineering uses. The main focus is on the quantitative descriptions of material systems and processing routes. Coverage includes management of time-dependent changes in microscopic and macroscopic structure and its exploitation from the material''s conception through to its eventual obsolescence.