Carbon fibres with modulated properties and shape along the fibre length

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Title: Carbon fibres with modulated properties and shape along the fibre length
Authors: Blaker, JJ
Anthony, DB
Tang, G
Shamsuddin, S
Abdolvand, A
Shaffer, M
Bismarck, A
Item Type: Conference Paper
Abstract: This paper presents a detailed experimental examination of the influence of the thickness of flat energy directors (ED) on the ultrasonic welding (USW) process for carbon fibre/polyetherimide composites. Three thicknesses of flat ED were compared: 0.06 mm, 0.25 mm and 0.50 mm. Power and displacement data for 0.06 mm-thick EDs did not clearly show the stages of the process and the location of the optimum for best weld quality. Consequently, an investigation of samples welded at different stages in the welding process had to be performed. For 0.06 mm-thick EDs, the optimum was determined to occur at the beginning of the downward displacement of the sonotrode in the vibration phase. The output parameters at the optimum conditions for all thicknesses were compared. Average lap shear strength was found to be lowest for 0.06 mm-thick EDs. Based on the analysis of the fracture surfaces, resin flakes and voids were observed when using the thinnest energy directors, indicating thermal degradation. These observations suggest that thin energy directors are not as efficient as thicker EDs (i.e. 0.25 mm) to achieve preferential heat generation at the weld line, leading to less consistent weld quality.
Issue Date: 19-Jun-2015
Date of Acceptance: 19-Jul-2015
Publisher: ICCM
Copyright Statement: © 2015 ICCM
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: AERO/RB1527
Conference Name: 20th International Conference on Composite Materials
Publication Status: Published
Start Date: 2015-06-19
Finish Date: 2015-06-24
Conference Place: Copenhagen
Appears in Collections:Faculty of Engineering
Chemical Engineering
Faculty of Natural Sciences

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