Experimental and numerical investigation on the size effect of interlaminar shear strength for thick composites

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2024-11-20 DOI:10.1016/j.compstruct.2024.118710

Ziqing Hao , Xiaoyu Wang , Hongjun Ke , Gaojian Wei , George Kardomateas , Liu Liu

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Abstract

The study investigates the variation of interlaminar shear properties for unidirectional glass fiber reinforced polymer (GFRP) composites with different thickness using the short-beam shear (SBS) test in conjunction with DIC. To verify the scaling principle and clarify possible mechanisms of the interlaminar shear strength size effect, the quantitative parameters for characterizing randomly distributed irregular voids are proposed. It is seen that the variation of probability for void characteristics with thickness is one of the mechanisms for the interlaminar shear strength size effect. Furthermore, a micromechanical representative volume element (RVE) model with randomly distributed irregular voids is developed for numerical verication. The analysis indicates that the weakest link is related to not only the void size but also the void irregularity and void concentration. The void concentration has a pronounced negative impact on shear strength due to the intersection of the microcracks around the voids.

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厚复合材料层间剪切强度尺寸效应的实验和数值研究

本研究采用短梁剪切（SBS）试验结合 DIC，研究了不同厚度的单向玻璃纤维增强聚合物（GFRP）复合材料层间剪切性能的变化。为了验证缩放原理并阐明层间剪切强度尺寸效应的可能机制，提出了表征随机分布不规则空隙的定量参数。结果表明，空隙特征概率随厚度的变化是层间剪切强度尺寸效应的机制之一。此外，还建立了随机分布不规则空隙的微机械代表体积元素（RVE）模型，以进行数值验证。分析表明，最薄弱环节不仅与空隙大小有关，还与空隙不规则性和空隙集中度有关。由于空隙周围的微裂缝相互交织，空隙集中对剪切强度有明显的负面影响。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.