期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 146, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106416
关键词
Fused filament fabrication; Fiber Waviness; Longitudinal compression; Computational modelling; Continuous carbon fiber reinforced polymer composites
资金
- HPC System at National University of Singapore
- Singapore Ministry of Education Academic Research Fund Tier 1 [R265-000-687-114]
The study systematically investigates the longitudinal compression failure mechanisms of 3D printed continuous carbon fiber reinforced polymer components using the Fused Filament Fabrication (FFF) technique. Experimental and computational analyses show that the introduction of waved filaments can lead to degradation of the failure strength, although further degradation is limited when more waved filaments are used. Fracture morphology analysis reveals the occurrence of in-plane and out-of-plane kink-bands, with failure predominantly at the cross-section with the contact region of the waved and regular filaments.
Fused filament fabrication (FFF) with continuous carbon fiber filaments has proven to be a promising manufacturing technique in engineering applications. To provide guidance in the design of 3D printed carbon fiber reinforced polymer (CFPR) components, the longitudinal compression failure of continuous CFPR composites using the FFF technique is investigated systematically. First, longitudinal compression tests are performed for 3D printed continuous CFRP composites with and without designed waved filaments. The degradation of the failure strength is remarkable when the waved filaments are introduced. Nevertheless, further degradation is limited when more waved filaments are adopted. Next, the fracture morphologies are analyzed, and in-plane and out-of-plane kink-bands are observed in the microscopic images. For the specimens with waved filaments, fracture occurs at the cross-section with the contact region of the waved and regular filaments, as well as the cross-section with the maximum misalignment angle. Correspondingly, a computational framework for 3D printed continuous CFPR composites is established to explore the longitudinal compression failure mechanisms. The meso-scale computational models are reconstructed according to the geometric features of the deposited continuous CFRP filaments and the actual void volume fraction. The elastic properties of the filament are calculated by a micro-scale representative volume element (RVE) model, which is based on the fiber random distribution algorithm. The plastic deformation and failure is described by a filament constitutive model which is established by the Liu-Huang-Stout yield criterion and a simplified Tsai-Wu failure criterion. The experimental validation demonstrates the feasibility of the computational models to predict the stress-strain curves of 3D printed materials, and also capture the realistic longitudinal compression failure behavior.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据