Mechanisms of crack initiation and evolution in quasi-isotropic composite laminates under low-velocity impact

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-28 DOI:10.1016/j.tws.2025.114029

Jiahao Lin , Heran Wang , Shuchang Long , Xiaoqing Zhang , Xiaohu Yao

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引用次数: 0

Abstract

Quasi-isotropic composite laminates are widely used in engineering due to their excellent mechanical properties and design flexibility. However, under low-velocity impact, internal intra-laminar cracks and delamination can occur, leading to significant internal damage that may compromise structural integrity. This study focuses on the mechanisms of crack and delamination initiation, propagation, and interaction in quasi-isotropic composite laminates under low-velocity impact using XFEM. CT scans after low-velocity impact were conducted to capture crack characteristics. The results reveal the mechanisms of the initiation and propagation of intra-laminar cracks, and uncover that the presence of intra-laminar cracks triggers delamination initiation due to stress amplification at crack tip. Additionally, the study highlights the influence of ply angles on structural damage resistance, providing insights into the optimal layup design to enhance impact resistance. These findings contribute to a deeper understanding of damage evolution in quasi-isotropic composite laminates, offering valuable guidance for the structural optimization of impact-resistant materials.

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准各向同性复合材料层合板低速冲击裂纹萌生与演化机制

准各向同性复合材料层压板以其优异的力学性能和设计灵活性在工程中得到了广泛的应用。然而，在低速冲击下，内部层内裂纹和分层可能会发生，导致严重的内部损伤，可能会损害结构的完整性。采用XFEM研究了准各向同性复合材料层合板在低速冲击下裂纹和分层的萌生、扩展和相互作用机理。进行低速冲击后的CT扫描，捕捉裂纹特征。研究结果揭示了层内裂纹的萌生和扩展机制，揭示了层内裂纹的存在由于裂纹尖端的应力放大而引发分层萌生。此外，该研究强调了铺层角度对结构抗损伤性的影响，为优化铺层设计提供了见解，以提高抗冲击性。这些发现有助于更深入地理解准各向同性复合材料层合板的损伤演化，为抗冲击材料的结构优化提供有价值的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.