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In situ and real time x-ray computed tomography for the micromechanics based constitutive modelling of the unbonded flexible riser

Lookup NU author(s): Dr Ketan Pancholi, Dr Neville Dodds, Dr Dehong Huo


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© 2015 by ASME.The failure mechanism of the composite flexible riser, comprising a pipe with melt fused carbon fiber tape or pultruded composite rods, is not well understood. As there is change in the configuration of the composite layers and its manufacturing methods, so the bulk material property also changes significantly. To capture the correct material model for global FE analysis, real time x-ray computed tomography was performed while the flexible pipe was being compressed. For developing a constitutive model for the composites, a time series of 3D volume images were analyzed quantifying the local strains responsible for the debonding of the layers and the crack development. These values were then used to understand the inter-layer adhesion leading to correlation between the FE global modelling and experiments capable of capturing the progressive delamination. The resulting global modelling was used to determine the area under compressive loading. The effect of global sea conditions and cumulative damage was noted. A correlation between the global model and experiments can be used to optimize riser performance. This method hopes to capture the overall behavior of flexible pipe under compressive loading.

Publication metadata

Author(s): Pancholi K, Jha V, Dodds N, Huo D, Latto J

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Proceedings of the ASME 2015 International Conference on Ocean, Offshore and Arctic Engineering - OMAE 2015

Year of Conference: 2015

Acceptance date: 01/01/1900

Publisher: American Society of Mechanical Engineers (ASME)


DOI: 10.1115/OMAE2015-41817

Library holdings: Search Newcastle University Library for this item

ISBN: 9780791856512