Glass reinforced epoxy tubes subjected to indentation load: A study of scaling effects

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  • The Petroleum Institute


Scaling effects in thin walled glass reinforced epoxy filament wound cylindrical tubes with [±55°] layup subjected to indentation load are presented in this work. Buckingham PI theorem is used to scale input and output parameters for four different scales (n=1/4, 1/2, 3/4 and 1). Scaling laws are investigated for force, energy dissipation and damage propagation when tubes are resting on a flat surface. Damage propagation is captured with a video camera, by recording damage reflection on an upward facing mirror placed inside the tubes. The threshold force causing onset of delamination is identified and used for calculation of mode II energy release rate GIIC with already established relation between the two. The scaling laws have been found effective in estimating quite a few parameters, including force displacement, energy displacement relation and peak load. Damage growth is found to obey scaling law and it is presented with respect to force applied, energy dissipated, indentation displacement and time.


Original languageEnglish
Pages (from-to)433-444
Number of pages12
JournalComposite Structures
Issue number1
Early online date2 Jul 2014
Publication statusPublished - 1 Nov 2014


  • Filament wound tubes, Glass reinforced epoxy, Indentation, Scaling