连续纤维增强3D打印复合材料声发射监测与损伤模式识别

doi:10.19936/j.cnki.2096-8000.20250628.011

摘要/Abstract

摘要： 连续纤维3D打印复合材料兼顾了复合材料的力学性能和极端复杂结构的打印工艺,具有较好发展前景。为探究纤维增强3D打印复合材料损伤演化行为和失效机理,制备了5%和15%芳纶纤维3D打印复合材料试件,开展了三点弯曲和声发射监测试验。结合小波包变换和k-means聚类算法,提出了芳纶纤维3D打印复合材料损伤模式识别方法,分析不同芳纶纤维含量对3D打印复合材料的损伤机理影响。结果表明:与试样A(5%纤维含量)相比,试样B(15%纤维含量)的最大载荷提高了29%。由于试件A纤维含量少,内部三角形填充结构最先发生严重的基体开裂和分层损伤,最终引起芳纶纤维断裂,而试样B损伤主要集中在弯曲加载后期。该方法为纤维增强3D打印复合材料失效分析提供了思路。

关键词: 3D打印, 复合材料, 声发射, 小波包变换, 损伤机理

Abstract: Continuous fiber 3D-printed composites balance the mechanical properties of composites and the printing process of extremely complex structures, which has a promising development prospect. To investigate the damage evolution behavior and failure mechanism of fiber-reinforced 3D printed composites, 5% and 15% continuous Kevlar fiber-reinforced 3D printed composite specimens were prepared, and three-point bending and acoustic emission monitoring tests were conducted. A damage mode identification method for Kevlar fiber 3D printed composites combining wavelet packet transform and k-means clustering algorithm is proposed to investigate the damage mechanism of 3D printed composites with different Kevlar fiber contents. The results showed that the maximum load of specimen B (15% fiber content) was increased by 29% compared with that of specimen A (5% fiber content). Due to the low fiber content of specimen A, the internal triangular filler structure was the first to undergo severe matrix cracking and delamination, which ultimately caused Kevlar fiber breakage, whereas the damage of specimen B was mainly concentrated in the late stage of bending loading. The method provides ideas for failure analysis of fiber-reinforced 3D printed composites.

Key words: 3D printed, composites, acoustic emission, wavelet packet transform, damage mechanism

中图分类号:

TB332

雒新宇. 连续纤维增强3D打印复合材料声发射监测与损伤模式识别[J]. 复合材料科学与工程, 2025, 0(6): 78-84.

LUO Xinyu. Acoustic emission monitoring and damage mode recognition of continuous fiber reinforced 3D printed composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(6): 78-84.

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