The evolution of hygroscopic internal stress of jute/PLA composites based on X-ray computed tomography

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-08-25 DOI:10.1016/j.compstruct.2025.119603

Ning Jiang , Guangxin Li , Yaomin Li , Shangbin Su , Xiangyu Tian

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Abstract

The study investigates the water diffusion behavior and the evolution of internal stress in jute/polylactic acid (PLA) composites. X-ray tomography and 3D reconstruction techniques were employed to segregate jute fibers from the PLA matrix and establish a 3D finite element model that accurately represents the true microstructure of the composite. The kinetic parameters of water absorption (coefficient of water diffusion D and saturation water content M_m) and coefficient of water absorption swelling (β) of jute, PLA, and composites were obtained from experimental data and finite element analysis (FEA). Furthermore, the diffusion of water and the swelling behavior induced by water absorption in jute/PLA composites were simulated employing Abaqus software. The timing and location of composite damage, as well as the quantitative relationship between internal stress and time were determined. This study not only offers a novel method for analyzing the evolution of internal stress in short fiber reinforced composites but also provides significant guidance for the targeted design of short fiber reinforced composites.

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基于x射线计算机断层扫描的黄麻/PLA复合材料吸湿内应力演化

研究了黄麻/聚乳酸（PLA）复合材料中水分的扩散行为和内应力的演化规律。采用x射线断层扫描和三维重建技术将黄麻纤维从PLA基体中分离出来，建立了能够准确表征复合材料真实微观结构的三维有限元模型。通过实验数据和有限元分析，得到了黄麻、聚乳酸和复合材料的吸水动力学参数（水扩散系数D和饱和含水量Mm）和吸水膨胀系数（β）。利用Abaqus软件模拟了黄麻/PLA复合材料中水分的扩散和吸水引起的膨胀行为。确定了复合损伤发生的时间和位置，以及内应力与时间的定量关系。该研究不仅为分析短纤维增强复合材料内应力演化提供了一种新的方法，而且对短纤维增强复合材料的定向设计具有重要的指导意义。

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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.