Influence of voids and yarn content on mechanical properties and damage evolution of fine woven pierced C/C composites

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

Composite Structures Pub Date : 2025-09-09 DOI:10.1016/j.compstruct.2025.119636

Tianlei Yao , Diansen Li , Lei Jiang , Frederik Desplentere , Stepan V. Lomov

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引用次数: 0

Abstract

Fine woven pierced C/C composites with low density, good three-dimensional monolithic properties, high strength have a great deal of application in the defense and aerospace. Both voids and yarn content always had a crucial influence on C/C composites. In this work, the structural information including voids content and yarn dimension was statistically investigated by Micro-CT. Parametric finite element models considering voids were established, and the effects of voids and Z-yarn contents on the compression properties and damage mechanism were investigated. Results showed that the established FEM with voids had better prediction accuracy than FEM without voids. The compressive properties decreased remarkably with the increase of voids, and the presence of voids caused damage to the material at low strains and also enabled a more uniform stress distribution to some extent. Because the introduction of Z-direction yarns slightly increased the volume fraction of fiber, the compressive strength and modulus increased by increasing Z-yarn content.

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孔隙率和含纱量对细纺穿孔C/C复合材料力学性能及损伤演变的影响

细编织穿孔C/C复合材料具有密度低、三维整体性能好、强度高等特点，在国防和航空航天领域有着广泛的应用。空穴和含纱量对C/C复合材料的性能影响很大。本文利用Micro-CT对纱线的结构信息，包括孔隙率和纱线尺寸进行了统计研究。建立了考虑孔洞的参数化有限元模型，研究了孔洞和z纱含量对复合材料压缩性能和损伤机理的影响。结果表明，建立的含孔洞有限元法的预测精度优于无孔洞有限元法。随着孔洞的增大，材料的抗压性能显著降低，在低应变下，孔洞的存在对材料造成损伤，并在一定程度上使材料的应力分布更加均匀。由于z向纱的引入使纤维的体积分数略有增加，因此随着z向纱含量的增加，纤维的抗压强度和模量也有所增加。

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

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.