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Posts
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portfolio
ICCM23 in Belfast, UK
Photo in International Conference on Composite Material 2023 
publications
3D Characterisation of the Tensile Failure of CFRPs Manufactured Through Tailored Fibre Placement
Published in ICCM23, 2023
This work, presented at ICCM23 in PPT form, investigates the tensile response and 3D damage development in a [0/60/−60]s TFP‑manufactured CFRP composite using in‑situ X‑ray microscopy. Results highlight the critical role of stitching threads in influencing fibre bundle morphology, crack initiation, and propagation, while effectively limiting interlaminar delamination.
Recommended citation: Sun, G., Mitchell, R., Chen, Z., Omrani, F., Smith, M., Fairclough, J.P.A. and Pinna, C., 2023, August. 3D characterisation of the tensile failure of CFRPS manufactured through tailored fibre placement. In Proceedings of the 2023 International Conference on Composite Materials. Queen's University Belfast.
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3D characterisation of local deformation and damage development in tailored fibre placement-manufactured composites under tensile loading
Published in SAMPE 2024, 2024
This work, presented at SAMPE 2024 in PPT form, explores the tensile response and 3D strain evolution of TFP‑manufactured CFRP composites using in‑situ μXCT and a newly developed Python‑based DVC algorithm. The methodology reveals how resin‑rich regions around stitching threads influence damage development, providing valuable insight and validation tools for multiscale mechanical modelling.
Recommended citation: Sun, G., Mitchell, R., Chen, Z., Smith, M., Omrani, F., Fairclough, P. and Pinna, C., 2024. 3D characterisation of local deformation and damage development in tailored fibre placement-manufactured composites under tensile loading. In Proceedings of SAMPE Europe 24 (Vol. 2, pp. 1050-1058). SAMPE Europe/Curran Associates.
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3D tensile fracture analysis tailored fibre placement composites using digital volume correlation
Published in Theoretical and Applied Fracture Mechanics, 2025
This study presents the first in-situ tensile testing of a Tailored Fibre Placement (TFP) composite within an X-ray CT microscope, revealing that cracks initiate below 50 % UTS and propagate mainly within fibre bundles along strain concentration bands. Findings show that stitching threads limit delamination, and results provide a basis for optimising manufacturing and laminate design as well as developing physically based multiscale strength prediction models for lightweight structural applications.
Recommended citation: Sun, G., Mitchell, R.L., Chen, Z., Omrani, F., Smith, M., Frias, C., Fairclough, J.P.A. and Pinna, C., 2025. 3D tensile fracture analysis of tailored fibre placement composites using digital volume correlation. Theoretical and Applied Fracture Mechanics, p.105127.
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talks
Talk 1 on Relevant Topic in Your Field
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Conference Proceeding talk on ICCM23
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Abstract: One of the promising automated fibre tow placement techniques for composite manufacturing is Tailored Fibre Placement (TFP) which provides flexibility for designing complex structures. The inherent anisotropic properties of carbon fibre reinforced plastic (CFRP) composites can be used during manufacturing through tailored placement of fibre tows to optimise lightweight and high performance simultaneously. In this study, the tensile response of a [0/60/−60]s TFP-manufactured CFRP composite was characterised through mechanical testing, carried out inside an X-ray microscope (XRM). Prior to loading a bespoke segmentation procedure was developed to clearly reveal the internal structure of the composite, including carbon fibre bundles and stitching threads. The sample was then progressively loaded with regular interruptions to scan the specimen and to characterise damage development. Results reveal the effect of stitching threads on both the morphology of carbon fibre bundles and the crack propagation process. The first crack initiated from the edge of the specimen and at mid-thickness. Further cracks appeared in the volume and in different plies as the load increased. A very fast propagation rate was recorded for these latter cracks which unloaded the first surface crack. This result emphasised the need for 3D observations to fully characterise the complex crack network eventually leading to failure of the specimen. Only a small amount of interlaminar delamination was observed, which was assumed to be prevented by the vertical stitching threads and no cracks were observed in the base material during the whole loading process.
teaching
Teaching experience 1
Undergraduate course, University 1, Department, 2014
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Teaching experience 2
Workshop, University 1, Department, 2015
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