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Novel Experimental Method for Microscale Contact Analysis in Composite Fabric Forming


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Authors

Smerdova, O 
Sutcliffe, MPF 

Abstract

This paper describes a novel experimental rig and associated experimental method developed to investigate composite fabric/tool contact at the microscopic scale. A key feature of this method is that it enables direct observation of real contact at the scale of fibres and the evolution of this contact under simultaneous application of shear and compression loads. To observe the contact, an optical semi-reflective coating is used. An algorithm is developed to analyse the contact images and measure the real contact length and orientation of individual fibres. The method is applied to microcontacts of carbon twill fabric. The real contact length under an apparent pressure of 1.9 kPa is surprisingly small compared to the apparent contact length. Transverse forces associated with friction are also measured. However these results are difficult to interpret as the test generates friction forces which differ from those which would be seen in conventional sliding friction tests.

Description

Keywords

Carbon fibre, Fabrics/Textiles, Micro-mechanics, Forming

Journal Title

Experimental Mechanics

Conference Name

Journal ISSN

0014-4851
1741-2765

Volume Title

55

Publisher

Springer Science and Business Media LLC
Sponsorship
Engineering and Physical Sciences Research Council (EP/K032798/1)
The authors are very grateful to Nazario Morgado and Dr Juliette Cayer-Barrioz from the LTDS laboratory in Lyon (France) for the calculations of the optical properties of semi reflective coatings, and to the Tribology Group of Imperial College London for help with these coatings. We also acknowledge the contribution of our industrial partners Jaguar Land Rover and Granta Design Ltd, as well as the academic partners from the Composites group at the University of Nottingham. This work was funded by an Engineering and Physical Sciences Research Council grant (reference EP/K032798/1).