Abstract: Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.

Abstract: Disclosed is an elastic compression device for storing, thanks to a composite spring, large elastic energies under a small mass, suitable for astronautics, aeronautics, elastic suspension elements for automotive and rail transport, and industrial mechanisms. This is achieved by a device, tolerant to damage, offering immunity to creep, shocks to corrosion and notch while reaching levels of considerable energy density, namely 1,400 J/kg, which is 4.66 times more than of steel springs. The device has a bellows shape, of its elastic element of compression, which shape includes at least one portion of an ellipse, terminated by supports. Further, the device is leakproof, so that the device can contain pressurized gas or fluid and can be used as an air or a hydraulic strut.

Abstract: Disclosed are thin-walled metal liners, for composite tank, type III, preferably designed to contain gases or hydrogen under high pressure, intended for land, sea, air and space transport, as well as static storage. This liner consists of a main cylinder of revolution, terminated, at least at one of its ends, by an evolutionary shape, substantially hemispherical, gradually connecting to its pole on a cylindrical part of smaller diameter than the main cylinder, the second end of the main cylinder may be either substantially identical to the first, is called “one-eyed” that is to say that it has an evolutionary shape, substantially in the entire hemisphere, that is to say without cylindrical part of smaller diameter than the main cylinder, at its pole.

Abstract: Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.

Abstract: Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.

Abstract: Method of producing spring wires shaped as a cylinder. The wire includes at least one first plurality of layers of wound fibres, the layers being disposed on top of one another and impregnated with a matrix. The first plurality of layers includes at least two stacked layers of fibres which are wound in opposing directions along two coaxial helices around the same axis to the left and right thereof respectively. The tangents to the two helices together with the axis (10) form respectively two angles having values ?x-1 and ?x which are respectively equal to ?+k? and ??? k?, ? being a function of the value of the modulus of elasticity for the spring to be produced and k being a factor of between 0 and 1. The method is suitable for the production of helical cylindrical-type spring wires for the suspension systems of motor vehicles.

Abstract: Method of producing spring wires shaped as a cylinder. The wire includes at least one first plurality of layers of wound fibres, the layers being disposed on top of one another and impregnated with a matrix. The first plurality of layers includes at least two stacked layers of fibres which are wound in opposing directions along two coaxial helices around the same axis to the left and right thereof respectively. The tangents to the two helices together with the axis (10) form respectively two angles having values ?x?1 and ?x which are respectively equal to ?+k? and ???k?, ? being a function of the value of the modulus of elasticity for the spring to be produced and k being a factor of between 0 and 1. The method is suitable for the production of helical cylindrical-type spring wires for the suspension systems of motor vehicles.

Abstract: An axle assembly for a vehicle includes a chassis (1) and at least two wheels (2, 3) suitable for coming into contact with ground (4). A unit beam (5) associates the two wheels with the chassis and holds them in two substantially parallel planes (6, 7). A point (10) situated substantially between the two ends (11, 12) of the beam is prevented from rotating relative to the chassis. Two arms (13, 14) are fixed substantially at one of their ends to the end of respective beams. The two wheels are rotatably mounted to the opposite ends of the arms. The two portions (36, 37) of the beam (8) situated on opposite sides of the point situated between the two ends of the beam are made of a material such that each of them has anisotropic torsion elasticity (42, 43) in the opposite direction to the other.