Shape-Dependent Mechanical Behavior of Edge-Notched Large-Tow Chain-Stitch Composites with Bi-Directional Symmetric Layup: Numerical and Experimental Investigation

IF 3.9 4区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Applied Composite Materials Pub Date : 2026-07-09 DOI:10.1007/s10443-026-10504-y

Xu Tong, Wei Jing, Yuanyuan Fang, Junchao Zhu, Huabing Wen, Wantao Guo, Junhua Guo

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引用次数: 0

Abstract

Large-tow chain-stitched composites are promising for efficient composite manufacturing, but edge-notches may strongly affect their load-carrying capacity. In this work, T700-48 K carbon fiber/epoxy chain-stitched composites with a balanced [± 45]₆ layup were tested with circle-shaped, diamond-shaped, and slit-shaped edge-notches. Quasi-static tensile tests were combined with digital image correlation, fracture morphology observation, and macro-meso finite element analysis to examine the edge-notch-shape effect. The results show that the introduction of edge-notches causes only a small change in stiffness, while the tensile strength decreases markedly. The average strengths of the circle-shaped, diamond-shaped, and slit-shaped edge-notched specimens were 74.00, 67.29, and 58.24 MPa, respectively, which are 33.3%, 39.4%, and 47.5% lower than that of the unnotched specimens. The predicted strength errors of the three edge-notched specimens were all below 3%. Among the three notch types, the slit-shaped notch led to the most severe strain concentration and localized damage, whereas the circle-shaped notch showed a smoother stress transfer and the highest residual strength. The results provide a basis for notch-shape selection and damage evaluation in large-tow chain-stitched composite structures.

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双向对称铺层边缘缺口大束链缝复合材料形状相关力学行为：数值与实验研究

大束链缝复合材料是一种高效的复合材料制造方法，但边缘缺口可能会严重影响其承载能力。在这项工作中，t700 - 48k碳纤维/环氧树脂链缝复合材料具有平衡的[±45]6层，测试了圆形，菱形和狭缝形的边缘缺口。准静态拉伸试验结合数字图像相关、断口形貌观察和宏细观有限元分析来检验边缘-缺口形状效应。结果表明，边缘缺口的引入对材料的刚度变化不大，但抗拉强度明显降低。圆形、菱形和裂隙形边缺口试件的平均强度分别为74.00、67.29和58.24 MPa，分别比未缺口试件低33.3%、39.4%和47.5%。三种边缘缺口试件的强度预测误差均在3%以下。在3种缺口类型中，裂隙型缺口导致的应变集中和局部损伤最为严重，圆形缺口的应力传递更为平滑，残余强度最高。研究结果为大拖曳链缝复合材料结构的缺口形状选择和损伤评估提供了依据。

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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.