Experimental and numerical analysis of low- velocity impact behavior of wound products using multi-filament winding technique

The wound products are subjected to various impact loads during their service life, which caused invisible damage to the composite layers. In this paper, we investigated the failure behavior of composite layers fabricated using an innovative multi-filament winding (MFW) process under impact load. Firstly, the principle of the MFW technique was introduced. Finite element models were constructed for both novel and conventional techniques, and subse-quent low-velocity impact (LVI) tests were performed to acquire the time-force and time -energy data for the CFRP (Carbon Fiber Reinforced Polymer) laminates. The test results were in good agreement with the LVI responses of the composites obtained from the simulations. The failure modes and microscopic damage of the composite layers of the two techniques were analyzed by scanning electron microscopy (SEM). The results showed that under the same impact velocity, three damage modes of fiber fracture, matrix cracking, and delami-nation were observed for both techniques. However, the composite layers of the MFW tech-nique exhibited more excellent impact resistance properties in terms of maximum contact force, absorbed energy, as well as inter-laminar and intra-laminar damage. The MFW tech-nique exhibits a notable level of winding efficiency and demonstrates exceptional perfor-mance of manufactured products, which can meet the increasing demand of winding products over the years.& COPY; 2023 The Author(s). Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).