Influence of post-processing on the Mode I and Mode II static fracture toughness of additively manufactured carbon fiber composites

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

Composite Structures Pub Date : 2025-09-22 DOI:10.1016/j.compstruct.2025.119664

Zane Forbes , Johannes Reiner , Xiaobo Yu , Garth Pearce , Mathew W. Joosten

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Abstract

The layer-by-layer fabrication process of additively manufactured (AM) composites can introduce interlaminar defects that may impact interlaminar fracture toughness. This study investigates the effect of post-processing on the interlaminar fracture toughness of AM continuous carbon fibre/polyamide composites produced via fused filament fabrication. Post-processing samples at 150 °C enhanced the initiation interlaminar fracture toughness by 9.12 % in Mode I and 17.94 % in Mode II, while the propagation interlaminar fracture toughness increased by 18.14 % and 9.37 %, respectively. Optical microscopy revealed that post-processing reduced the void content, from 6.24 % to 1.12 %. Scanning electron microscopy highlighted that the fracture surfaces of the post-processed samples showed a reduction in void-related defects. These findings demonstrate that the interlaminar fracture toughness of AM composites can be improved through post-processing consolidation, which enhances the materials resistance to crack initiation and propagation.

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后处理对增材碳纤维复合材料I型和II型静态断裂韧性的影响

增材制造（AM）复合材料的逐层制备工艺会引入层间缺陷，影响层间断裂韧性。研究了后处理对增材制造碳纤维/聚酰胺连续复合材料层间断裂韧性的影响。150℃下的后处理试样在模式I和模式II下的起始层间断裂韧性分别提高了9.12%和17.94%，而在模式II下的扩展层间断裂韧性分别提高了18.14%和9.37%。光学显微镜显示，后处理将孔隙含量从6.24%降低到1.12%。扫描电镜显示，后处理样品的断口表面显示与空洞相关的缺陷减少。研究结果表明，通过后处理固结可以提高增材复合材料的层间断裂韧性，增强材料抗裂纹萌生和扩展的能力。

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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.