COMPOSITES SCIENCE AND ENGINEERING ›› 2025, Vol. 0 ›› Issue (6): 78-84.DOI: 10.19936/j.cnki.2096-8000.20250628.011

• DESIGN AND TECHNIQUE • Previous Articles     Next Articles

Acoustic emission monitoring and damage mode recognition of continuous fiber reinforced 3D printed composites

LUO Xinyu 1,2   

  1. 1. Assets and Logistics Management, Hebei Petroleum University of Technology, Chengde 067000, China;
    2. Chengde Advanced Ice-snow Sports Equipment Technological Innovation Center, Chengde 067000, China
  • Received:2024-03-25 Online:2025-06-28 Published:2025-07-24

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

CLC Number: