Paper number 105

PREDICTION OF THE LONG TERM MECHANICAL BEHAVIOUR OF COMPOSITE PIPES UNDER INTERNAL PRESSURE FROM SHORT TERM TESTS

Patricia KRAWCZAK, Patrick VANDEVOIR and José PABIOT

ECOLE des MINES de DOUAI,
Department of Polymers & Composites Technology,
941 rue Charles Bourseul, BP 838, F-59508 DOUAI, FRANCE
http://www.ensm-douai.fr E-mail: plastics@ensm-douai.fr
Fax:+33 3 27 71 25 25

Summary

The aim of the paper is the prediction of the long-term mechanical behaviour of GFRP pipes under internal dynamic water pressure with end effects from burst tests carried out on pipes. Both short-term damage and long-term dynamic fatigue damage have been characterized by damage factors with a separation of damage initiation and propagation stages. A relationship has been found between these quantities: When there is a unique structural parameter which is the main generating element of the materials degradation, the effect of an overload under an increasing pressure is similar to the effect of a number of fatigue cycles under a repeated pressure.

Keywords

tubes, damage, dynamic fatigue, glass fibres, polymer matrices, interface, biaxial loading, filament winding.