Composite laminate product
View Patent ↗A laminated product ( 1 ) that forms a deformable cellular structure, comprising: an upper band ( 2 ) and a lower band ( 3 ) both oriented in the same main direction (X); and between the two bands and connecting the latter in zones ( 4 a , 4 b ) referred to anchoring zones, a series ( 5 A, 5 B, 5 C) that extends in the direction X, of cylindrical structures ( 5 ) referred to connecting cylindrical structures that are non-touching in the direction X. Each connecting cylindrical structure ( 5 ) comprises a plurality of preferably concentric elementary cylinders ( 5 a , 5 b ) having their generatrix oriented along an axis Y perpendicular to the direction X, said elementary cylinders being fitted one inside the other and interconnected to one another in each anchoring zone ( 4 ). Said elementary cylinders are especially composite cylinders comprising fibers embedded in a resin matrix. Such a laminated product can be used as an elastic beam having a high resistance to flexural/compressive stresses and having a high endurance to such repeated or alternated stresses, in particular as a shear band in a non-pneumatic resilient wheel.
1. A laminated product that forms a deformable cellular structure, comprising:
an upper band and a lower band both oriented in a same main direction, the upper and lower bands comprise fibres embedded in a resin matrix that are unidirectional, oriented parallel to a direction X, wherein the resin matrix is a thermosetting resin that is a vinyl ester resin; and
between the two bands and connecting the upper band and the lower band in zones referred to as anchoring zones, a series that extends in the direction X of cylindrical structures, referred to as connecting cylindrical structures, that are non-touching in the direction X and are not connected together in the direction X,
wherein each connecting cylindrical structure comprises a plurality of elementary cylinders having their generatrix oriented along an axis Y perpendicular to the direction X, said elementary cylinders being fitted one inside the other and interconnected to one another in each anchoring zone, wherein the elementary cylinders are concentric cylinders,
wherein the elementary cylinders are composite cylinders comprising glass fibres embedded in the resin matrix, and
wherein an average distance d, measured in the direction X, between two consecutive connecting cylindrical structures is such that a ratio d/D is between 0.10 and 0.50, where D is an outer diameter of the connecting cylindrical structures.
2. The laminated product according to claim 1 , wherein the fibres are continuous and unidirectional, oriented circumferentially in a plane perpendicular to the axis Y.
3. The laminated product according to claim 1 , wherein the fibres of the bands are continuous fibres.
4. The laminated product according to claim 1 , wherein the fibres of the bands are glass fibres and/or carbon fibres.
5. The laminated product according to claim 1 , wherein the connecting cylindrical structures have an outer diameter D that is substantially constant in a direction Z normal to the direction X and to the axis Y, so as to keep the upper and lower bands substantially equidistant.
6. The laminated product according to claim 1 , wherein the laminated product forms a continuous and closed circumferential ring.
7. A non-pneumatic wheel or tire having a reinforcing element comprising a laminated product according to claim 6 .
8. A finished product comprising a laminated product according to claim 1 .