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Extracting interlaminar cohesive laws from displacement field measurements: 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting

Extracting interlaminar cohesive laws from displacement field measurements: 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting
Extracting interlaminar cohesive laws from displacement field measurements: 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting
Cohesive/interface elements are one of the successful numerical tools that have been recently applied to many different problems and shown good results in modelling crack development. However, most applied cohesive laws are hypothetical and are not based on experimental measurements. The aim of this study is to investigate the damage development at a delaminating interface and to propose a method by which the mode-II traction-separation law can be extracted experimentally. To find the traction-separation law, both variables (traction and separation) need to be evaluated separately at the interface. Mode-II separation can be found by subtracting the displacements on each side of the interface, however finding the value of traction (shear stress) at the interface is more difficult. As a first step, the shear strain field is found from the available displacement field measurements and then, the shear stress is worked out using the shear constitutive law. After validating the proposed method against FE simulations, the experimental displacement field is used to find the traction-separation law. The overall form of the traction-separation law can be approximated by a trapezoidal shape.
modelling crack development, shear strain, shear stress, displacement field measurements
DEStech Publications Inc.
Jalalvand, M.
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Czel, G.
a1f54093-b1d0-45c2-9468-1761f8899c2a
Wisnom, M. R.
655f9d97-0d4c-4654-9b0e-3e5150991e42
Jalalvand, M.
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Czel, G.
a1f54093-b1d0-45c2-9468-1761f8899c2a
Wisnom, M. R.
655f9d97-0d4c-4654-9b0e-3e5150991e42

Jalalvand, M., Czel, G. and Wisnom, M. R. (2014) Extracting interlaminar cohesive laws from displacement field measurements: 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting. In, Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting: 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan C. DEStech Publications Inc..

Record type: Book Section

Abstract

Cohesive/interface elements are one of the successful numerical tools that have been recently applied to many different problems and shown good results in modelling crack development. However, most applied cohesive laws are hypothetical and are not based on experimental measurements. The aim of this study is to investigate the damage development at a delaminating interface and to propose a method by which the mode-II traction-separation law can be extracted experimentally. To find the traction-separation law, both variables (traction and separation) need to be evaluated separately at the interface. Mode-II separation can be found by subtracting the displacements on each side of the interface, however finding the value of traction (shear stress) at the interface is more difficult. As a first step, the shear strain field is found from the available displacement field measurements and then, the shear stress is worked out using the shear constitutive law. After validating the proposed method against FE simulations, the experimental displacement field is used to find the traction-separation law. The overall form of the traction-separation law can be approximated by a trapezoidal shape.

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More information

Published date: 8 September 2014
Keywords: modelling crack development, shear strain, shear stress, displacement field measurements

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Local EPrints ID: 446649
URI: http://eprints.soton.ac.uk/id/eprint/446649
PURE UUID: ac5d3753-3f07-4937-ae5d-bfcac6dbeefe
ORCID for M. Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

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Date deposited: 17 Feb 2021 17:30
Last modified: 18 Feb 2021 17:42

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Contributors

Author: M. Jalalvand ORCID iD
Author: G. Czel
Author: M. R. Wisnom

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