Extracting interlaminar cohesive laws from displacement field measurements

M. Jalalvand, G. Czel, M. R. Wisnom

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publicationProceedings of the American Society for Composites - 29th Technical Conference, ASC 2014;
Subtitle of host publication16th US-Japan Conference on Composite Materials
ISBN (Electronic)9781605951249
Publication statusPublished - 2014
Event29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting - La Jolla, San Diego, United States
Duration: 8 Sep 201410 Sep 2014

Conference

Conference29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting
CountryUnited States
CityLa Jolla, San Diego
Period8/09/1410/09/14

Fingerprint

Shear stress
Shear strain
Cracks

Keywords

  • modelling crack development
  • shear strain
  • shear stress
  • displacement field measurements

Cite this

Jalalvand, M., Czel, G., & Wisnom, M. R. (2014). Extracting interlaminar cohesive laws from displacement field measurements. In Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; : 16th US-Japan Conference on Composite Materials
Jalalvand, M. ; Czel, G. ; Wisnom, M. R. / Extracting interlaminar cohesive laws from displacement field measurements. Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; : 16th US-Japan Conference on Composite Materials. 2014.
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Jalalvand, M, Czel, G & Wisnom, MR 2014, Extracting interlaminar cohesive laws from displacement field measurements. in Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; : 16th US-Japan Conference on Composite Materials. 29th Annual Technical Conference of the American Society for Composites, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting, La Jolla, San Diego, United States, 8/09/14.

Extracting interlaminar cohesive laws from displacement field measurements. / Jalalvand, M.; Czel, G.; Wisnom, M. R.

Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; : 16th US-Japan Conference on Composite Materials. 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AU - Czel, G.

AU - Wisnom, M. R.

PY - 2014

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N2 - 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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KW - shear strain

KW - shear stress

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Jalalvand M, Czel G, Wisnom MR. Extracting interlaminar cohesive laws from displacement field measurements. In Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; : 16th US-Japan Conference on Composite Materials. 2014