Institut Francais Du Pe'trole

Aerospatiale Societe Nationale Industrielle

Societe Anonyme Dite: Aerospatiale Societe Nationale Industrielle

Aerospatiale

Societe Aerospatiale

Guy Metivaud

Marcel Auberon

Charles P Sparks

Jean-Claude Decidour

Pierre Odru

Michel Vignollet

Jacques Schmitt

Process for optimizing the features of multilayered tubes made of fibrous composite materials, allowing to maintain within the specified limits the limit elongations and stresses which they withstand in response to the applied strains. The process comprises selecting at least two optimized features characteristic of each layer (its thickness and the winding angle of the fibers for example) by starting from an initial tube selected a priori. Through small deviations applied to the parameters, the relations between small deviations applied to the parameters and the variations of the resulting limit elongations and stresses are determined, as well as the inverse relations relating the variations of the limit elongations and stresses to the parameter deviations. Knowing these inverse relations allows, in one or several stages, to find out the deviations to be applied in order to make up the measurable differences between the limit elongations and stresses of the optimized tube and the tube selected a priori. Application to the achievement of tubular pipes for the oil industry for example.

Process for optimizing multilayered tubes made of composite materials

Process for manufacturing a variable stiffness line and associated

A device for protection against fire (G3), comprising a flexible body (A3) of material with endothermic properties, comprising a filler releasing vapor under the effect of fire. According to the invention this device comprises, on at least that face of said body intended to be directed towards the fire, at least one layer (E3) of a fabric consisting of fire-resistant fibers and impregnated with an intumescent agent.

Device for protection against fire, made of endothermic flexible material

A method for hooping and maintaining in compression a core by a sheath, with the sheath being made of a composite material and having an internal cross section which is less than an external cross section of the core. The core and the sheath are aligned by centering them with respect to each other, and a prior tensile force is exerted over the core to provide a suitable sealing between the portion in contact of each of the ends of the core and of the sheath. A pressurized fluid is injected into the sheath in a direction of the core, to increase the cross section of the sheath by expanding the sheath in a circumferential direction. The core is thereby gradually inserted into the sheath. When the insertion is complete, fluid injection is ceased and an expendable portion of the sheath is cut off.

Method for hooping and maintaining in compression a core by a sheath

According to the invention, there is provided a heat resistant pad formed by the superimposition of a plurality of fabric layers of carbonizable oxidized organic fibers, at least one face of the said pad being covered with a silicone layer.

Sheet material for constructing high performance thermal screens

A sheath for insulating a volume that optionally contains an object is made of a resilient material and it has a join plane which is shaped to constitute a baffle.

Growing community of inventors

Talence, France

Guy Metivaud