| 摘要 |
The present invention relates to a tube made from composite materials, having a low sensitivity to variation in elongation under the effect of internal pressure, comprising a number n of stable layers of strengthening fibres, the fibres of each layer (i) being placed at a same winding angle, in absolute terms, referred to as tête, with respect to the axis of the tube, with an equal proportion of fibres wound at the said angle in one direction (|têta|) as there are fibres wound in the opposite direction (-|têta|), the fibres of each layer being embedded in a matrix which adheres to these fibres, the fibres of a same layer and the associated matrix having a volume designated Y, the parallel fibres of one and the same layer and the associated matrix having as a whole a modulus of elasticity in the direction of the fibres designated E, characterised in that the n layers of fibres all respect the following equation: 0.35 </= A </= 0.60, where A equals the following expression: <IMAGE> i being the summation index over the various layers of fibres. <IMAGE> |
