Investigating the interfacial adhesion between carbon fibre and plastic matrix by varying 3D-printing parameters

Thumbnail Image

Files

master_Kalimisetty_Tejaswi_2025.pdf (18.66 MB)

URL

Journal Title

Journal ISSN

Volume Title

School of Engineering | Master's thesis
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.

Authors

Date

2024-12-22

Department

Major/Subject

Product Development

Mcode

Degree programme

Master's programme in Mechanical Engineering

Language

en

Pages

79

Series

Abstract

Additive manufacturing (AM) has revolutionized modern manufacturing by enabling the creation of complex, lightweight, and high-performance structures with minimal waste. This study focuses on fibre-reinforced additive manufacturing, specifically exploring the interfacial adhesion between Carbon Fibre (CF) and a Polyethylene Terephthalate Glycol (PET-G) matrix. Although substantial research has been conducted on the mechanical properties of composite materials, specific studies have not addressed the bonding characteristics at the interface, particularly concerning CF and PET-G composites. This research systematically examines the influence of critical printing parameters, including infill density, infill pattern, and the embedded length (EL) of CF, on the mechanical performance of 3D-printed composites. The correlation between peak load and printing parameters was assessed through a series of tensile tests performed on specimens with varying infill densities (ranging from 50% to 100%) and two distinct infill patterns (line and triangle). The results reveal that higher infill densities and longer embedded lengths significantly boost the adhesion between CF and PET-G, enhancing mechanical strength and consistency. The triangular infill pattern exhibited better stress distribution and structural reliability than the line pattern, especially at elevated infill densities. Observed anomalies, such as inconsistent bonding at lower densities or extreme peak loads in localized areas, highlight the sensitivity of the printing process to manufacturing conditions. This study underscores the pivotal role of printing parameters in optimizing interfacial bonding and mechanical performance in fibre-reinforced composites. Further investigation into advanced manufacturing techniques and parameter optimization is recommended to ensure consistent performance across various design specifications.

Description

Supervisor

Partanen, Jouni

Thesis advisor

Kumar, S Siddharth

Keywords

additive manufacturing, carbon fibre, PET-G, interfacial bonding, multi-material extrusion, tensile testing

Other note

Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202501221578

Collections

[dipl] Insinööritieteiden korkeakoulu / ENG